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1
Wu, Yahui. "Compact microwave dual-band bandpass filter design." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18693/.
Повний текст джерелаАнотація:
The modern wireless communication systems require dual-band bandpass filters to support the standards that work at multiple frequency bands. This thesis demonstrates two design approaches for the development of compact microwave dual-band bandpass filters. The first approach is based on synthesising a dual-passband filter response utilising only one resonant frequency of the resonators. The second approach employs dual-band resonators that have tuneable the first and the second resonant frequencies to form the dual-passbands filter response. The dual-passband response synthesis method synthesises a response with dual passbands that is generated by a frequency transformation that places a finite frequency zero within the single- passband of a filter to split it into dual passbands. The transformed dual-passband response is characterised by the synthesised coupling matrix that consists of the coupling coefficients between coupled resonators. Two filters have been designed and fabricated using microstrip square open-loop and TE01δ mode quarter cylindrical dielectric resonators. The investigation based on simulation studies and measured results revealed that unloaded quality factor of the resonator is required to be ten times greater than the quality factor of each passband in order to realise the narrow passbands. The dual-band resonator methods employ multiple resonant modes of the resonator operating at different frequencies to implement the multiple passbands, respectively. Stepped impedance resonators in stripline and coaxial configurations have been presented and analysed for the realisation of dual-band bandpass filters. A second order dual-band bandpass filter formed by coaxial stepped impedance resonators has been designed, fabricated and tested. The measured frequency response agree well with the simulated response. The estimated breakdown power shows that the filter is capable of high power applications. Non-uniform pitch helical resonators are also proposed for the implementation of dual-band bandpass filters. Two non-uniform pitch helical resonator structures have been analytically modelled. The theoretical models of the non- uniform pitch helical resonators have been developed for accurate prediction of its dual-band characteristics. It is also employed in the general design process of the non-uniform pitch helical resonators. Resonator examples have been presented to show the applicability and validity of the analysis and simulation. Three dual-band bandpass filters have been designed and implemented using non-uniform pitch helical resonators. Their measured frequency responses agree reasonably with the ideal responses. Additionally, the simulation shows that the designed dual-band bandpass filters have relatively high power handling capability.
2
Hong, Sio Ian. "The microstrip parallel coupled-line bandpass filter with simultaneous dual-band response and bandwidth enhancement." Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2119530.
Повний текст джерела
3
Zhang, Hualiang. "Compact, reconfigurable and dual-band microwave circuits /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20ZHANG.
Повний текст джерела
4
Підгурська, Тетяна Вікторівна. "Двосмугові фільтри на діелектричних резонаторах з вищими типами коливань". Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/15382.
Повний текст джерелаАнотація:
У роботі досліджена актуальна задача проектування двосмугових фільтрів на діелектричних резонаторах з вищими типами коливань, що полягає в розробці математичних моделей та нових конструкцій, що забезпечують необхідні електричні параметри за мінімальної кількості елементів зв’язку. Запропоновано використання вищого робочого типу коливання ДР з більш високою добротністю разом із нижчим для побудови двосмугового фільтра; спосіб побудови двосмугових фільтрів на прямокутних ДР, який відрізняється тим, що за рахунок використання видовжених форм ДР з робочими коливаннями TE11δ та TE12δ дозволяє забезпечити приблизно однакові коефіцієнти зв’язку в обох робочих смугах пропускання; спрощений спосіб розрахунку коефіцієнтів зв’язку ДР на основі напруженості магнітного поля; отримано нові аналітичні вирази для розрахунку коефіцієнта взаємного зв'язку між резонаторами; розроблені математичні моделі двосмугових багаторезонаторних фільтрів на «дипольному» та «квадрупольному» типах коливань прямокутних ДР; запропоновано нові конструкції двосмугових багаторезонаторних фільтрів, які відрізняються тим, що мають мінімальну кількість елементів зв'язку.
5
Li, Shih-Jyun, and 李世鈞. "Design Of Dual-Band Bandpass Filter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90859639199578202783.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
100
This paper is divided in two parts, the first part introduce a dual band bandpass filter in chapter 3. By mathematical analysis and verification to complete a designing procedure, and using interdigital capacitance compensation to solve the phase difference between the even mode and odd mode of coupled lines. The advantage of this filter is the transmission zeros is right on the edge of passbands and the center of stopbands ccausing good filter effect. In chapter 4 also introduce a dual band bandpass filter,but with different structure to chapter 3. It is a dual band bandpass filter combined with two single band bandpass filter,the advantage of this filter is it can adjust the position of passband respectively. The circuits is designed with electromagnetic simulation software, and carry out to microstrip line,it have well consistency between theory and measurements results.
6
Wu, Po-Hsien, and 吳柏賢. "Design of a Dual-Band Bandpass Filter and a Wide Bandpass Filter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46533391721694336290.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
99
This study focuses on the design of a dual-band and a wide-passband bandpass filter, based on the planar microstrip structure. On the one hand, a new method for the dual-band filter is proposed. On the other hand, a wide-passband bandpass filter with a wide stopband is developed. As for the dual-band filter, two stepped impedance resonators, whose two ends are mutually coupled, are utilized. Transmission zeros appear around the paasband skirts and within the rejection band. As a result, the achievement in filtering is quite notable. In addition, detailed design procedures and formula are provided as well. As to develop the wide-passband bandpass filter, by adjusting the coupling between the stepped coupled line, transmission zeros can be easily tuned to result in a high level of harmonic suppression. Moreover, the design procedure for the wide-passband bandpass filter with a wide stopband is not complicated; besides, the circuit size is compact. In terms of filter simulation, a full-wave electromagnetic simulator is employed for this thesis. Moreover, these circuits are fabricated and measured. Well matched results between the simulation and measurement show the validity of all proposed circuits.
7
Lin, Hung Mao, and 林宏懋. "Dual-Mode Dual-Band Bandpass Filter Using Dual-Ring Resonator." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/dcsw29.
Повний текст джерелаАнотація:
碩士長庚大學
電子工程學系
105
This thesis presents analysis and design of dual-mode dual-band bandpass filter with a dual-ring structure. This circuit is composed of two concentric coupled rings. The first frequency is controlled by the full ring perimeter, and the second frequency is determined by using two shorting metal connections. The two bandwidths are controlled by two perturbation patches in the symmetric plane. A fractional bandwidth design curve photo have been given for design the circuit. Two circuits are fabricated and measured for validating the analysis. Measured responses show good agreement with the simulated responses obtained by EM simulation software package.
8
Sun, Jhong-Min, and 孫中民. "Design of Dual-Band Bandpass Filter and Wide Stopband Filters." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47180979286321478096.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
99
There are two parts in this thesis. The first part is design of a planar microwave dual-band bandpass filter. The structure of this dual-band bandpass filter is composed of an open-end coupled line and two parallel coupled lines with coupling feeding. Because the unequal even-mode and odd-mode phase velocity of the open-end coupled line, the interdigital capacitors at two ends of open-end coupled line are utilized to compensate the odd-mode phase velocity. Moreover, the added capacitive coupling between the input and output ports can move two transmission zeros at the passband skirts more closely. Then, two of single passband filters with different central frequencies are cascoded to achieve a dual-passband bandpass filter, and the J-inverter has been used to analyze this filter. In the second part, the planar microstrip bandpass filters with wide stopband are presented. The open-end coupled line, transmission line and short stub are the main structure of the wide stopband bandpass filter. By properly choosing electrical lengths of open-end coupled line, transmission line and short stub, the outband transmission zeros can be controlled to achieve a wide stopband. Moreover, the J-inverter can be used to analyze this filter. In addition, in order to increase the stopband bandwidth, two spur lines can be added into the input and output ports. All filters in this thesis are simulated with full-wave electromagnetic simulator, and these filters have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits.
9
Chou, Cheng-Yu, and 周正瑜. "Design of Reconfigurable Bandpass/Bandstop Filter and Dual-Band Filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/29306817280516762066.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程所
96
This thesis investigates a novel reconfigurable bandpass/bandstop filter and a heterogeneous-resonator-interleaved dual-band bandpass filter. First, the reconfiguration of bandpass and bandstop response is achieved by tuning the series-resonated perturbation extent to control the even and odd mode splitting. Two design issues must be addressed, including the alignment of central frequencies and the impedance match at both bandpass and bandstop modes. The theory and design methodology of the reconfigurability are described and an experimental filter is designed for demonstration. The measured bandpass response has an insertion loss of 1.6 dB, return loss better than 20 dB at 2.4 GHz. The bandstop response has greater than 20-dB rejection from 2.38 GHz to 2.8 GHz. Second, a novel dual-band bandpass filter is proposed by interleaving heterogeneous types of stepped-impedance resonators (SIR), where each type has its own resonant frequency and is different from each other. At the first passband, the first SIR is resonant and the other SIR is working as an input/output feeding network. At the second passband, the second SIR is resonating while the first SIR acts as an inter-coupling element between the resonating SIRs. A demonstrated circuit was designed for passbands at 2.4 GHz and 5.2 GHz. The measured insertion losses are less than 1.2 dB at 2.47 GHz and 2.1 dB at 5.2GHz, respectively. The return losses are greater than 17 dB and 20 dB at both bands, and four transmission zeros located at 1.6 GHz, 3.8 GHz, 5.8 GHz and 8 GHz, respectively.
10
Jia-LunChen and 陳嘉倫. "Dual-Band Bandpass Filter Design Using Composite Resonators." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46296136740081723893.
Повний текст джерела
11
Wu, Meng-Hsiu, and 吳孟修. "Microstrip Dual-Band Bandpass Filter With Extended Stopband." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/72359142648364699909.
Повний текст джерелаАнотація:
碩士國立交通大學
電信工程研究所
99
A new circuit structure is proposed for design of dual-band bandpass filters with extended upper stopband. This circuit consists of two parts: one is the main circuit having a coupled-line section of long, and the other is a sub-circuit feed-in the middle of the main circuit, where is the wavelength at arithmetic mean frequency of the two passbands. Analysis of the circuit is formulated by the transmission line theory, and design curves for dual-band response circuit are provided to allocate the positions of transmission poles and transmission zeros, the ratio of two passband frequencies, and the fractional bandwidths of two passbands. The effects of stopband extension by sub-circuit are discussed. The impedance and length ratios of the short stepped-impedance stub will be adjusted to control transmission zeros for stopband extension. For enhancing the filter performance in the stopband, two methods are adopted. The coupled lines are folded and become Schiffman sections for compensating the phase velocity difference between the even and odd modes, and the insertion of the shunt open stubs at the input and output ports to create the transmission zeros. One circuit is fabricated and measured to validate the idea.
12
謝曜鍵. "Design of Ring-Type Dual-Band Bandpass Filter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/73198405807704116224.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
電子工程學系
101
The purpose of this paper is using the ring microstrip line to design dual-band bandpass filters. The first and second filter structure are applied in IEEE 802.11b/g (2.4 GHz/2.45 GHz) and IEEE 802.11a (5.25 GHz) of Wireless Local-Area Network (WLAN). In this paper, we proposed a miniatrue ring filter technology, in the first structure, we introduce a half-wave length ring filter, it is formed by a ring resonator with a ground via on it, to form a ground at both ends of a half-wavelength resonator. The resonator is designed by a stepped-impedance ring to have the desired two frequency, the fundamental frequency and the second harmonic frequency are used as two pass-band frequency, and designed zeros on both side of the pass band by using the cross couple, In the high-level harmonic section, We used anti-parallel zero to suppress it. The second structure, we introduce a loaded quarter wavelength ring dual band pass filter. We use the first structure ring circuit, and added an open stub on the ring circuit. This can form a one end open and one end short quarter-wavelength resonator, and a short-circuit branch. This branch can be used to adjust the quarter-wavelength resonator fundamental frequency and the second harmonic frequency, In addition, both sides of the ring circuit coupled signal by magnetic coupling of middle ground via, thus by adjusting the ground via radius, you can adjust the magnitude of coupling and coupling coefficient. The simulation results of the two circuits show that in the first pass band, the center frequency is 2.4 GHz, and the ratio bandwidth is 7.3% and 8.1% respectively. The center frequency of second pass band is 5.25 GHz, and the ratio bandwidth is 4.36% and 6.04% respectively, and the insertion loss is less than 1 dB and reflection loss is larger than 20 dB in the two passband. The implementation results of the two circuits show that in the first pass band, the center frequency is 2.4 GHz, and the ratio bandwidth is 7.6% and 8.5% respectively. The center frequency of second pass band is 5.25 GHz, and the ratio bandwidth is 4.5% and 6.1% respectively, and the insertion loss is less than 1.5 dB and reflection loss is larger than 20 dB in the two passband.
13
Hu, Ruhai, and 胡如海. "Dual-Band Bandpass Filter with Tunable Center Frequencies." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01743705135440316125.
Повний текст джерелаАнотація:
碩士國立中央大學
電機工程學系
103
This study mainly introduces the design method and procedure of a type of center-frequency tunable dual-band bandpass filter, and presents the results of fabrication and measurement. This design integrates tunability with dual-band features on a single filter circuit, aiming to miniaturize the circuit area, and provide more flexibility in application. This configuration of proposed filter is based on two-mode stub-loaded open-loop resonators, with each mode resonating at the frequency of the band which to be designed. Tunability is provided by the varactors loaded at the end of transmission lines of resonators. With coupling coefficients extraction and correction to help tune circuit, 3-order bandpass response of the filter is formed by 3 coupled resonators. Filter is fabricated on Rogers RO4350B substrate with ε_r=3.66, tanδ=0.0031, and Skyworks SMV 1232 varactor diode employed to provide tunability. For the final fabricated circuit, measurement matches simulation on band frequencies, but insertion loss does not match at second passband. With adding the equivalent circuit of the component into simulation, results observed indicates the extra insertion loss of measurement may be caused by inherent loss of varactor. This study proposes simple and clear design procedure of tunable dual-band bandpass filter and fabricated circuits with measurements. High quality factor components and process could be considered to be employed to lower the insertion loss of passbands in future.
14
Lin, Tsu-Wei, and 林祖偉. "Three Dual-Mode Dual-Band Bandpass Filter Designs With Controllable Bandwidths." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/25585279155504213895.
Повний текст джерелаАнотація:
碩士國立交通大學
電信工程研究所
98
Three dual-mode dual-band bandpass filters are proposed in this thesis. The first dual-mode dual-band bandpass filter is devised based on a single stepped-impedance resonator. The center of the resonator is grounded through a short high-impedance section, which is equivalent to an inductor for providing coupling between the resonant modes. In addition, in order to increase the degree of freedom for dual-band design, an interdigital capacitor is introduced so that both center frequencies and bandwidths of two passband can be controlled. Moreover, with the aid of source-load coupling, two extra transmission zeros can be created close to the passband edges and hence greatly improve the frequency selectivity between the two passbands. Two filters are fabricated and measured to validate the proposed idea. The measured results show good agreement with the simulation. The second dual-mode dual-band bandpass filter is again designed based on two stepped-impedance resonators. Both ends of each resonator are terminated to the ground. For the dual-mode operation, the two stepped-impedance resonators are connected to the ground via by two short high-impedance sections. The inductive coupling is provided to control the bandwidths of the two passbands. With a skew symmetric feed structure, two transmission zeros are created between the two passbands. To obtain a simpler fabricated process and more compact circuit area, the third dual-mode dual-band bandpass filter is evolved from the second filter with two ground vias being connected to a single one. With the aid of source-load coupling, again, transmission zeros are generated to improved the selectivity of the two passbands. Two microstrip circuits are fabricated and measured to validate design ideas of the second and third bandpass filters. The simulation and measurement results show good agreement.
15
Chen, Hsin-Hsun, and 陳信勳. "Dual-Band Bandpass Filter Design Using Open-Loop Resonators." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/85044777315883972892.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
98
The dual-band bandpass filter which is combined by two single-band bandpass filters with open-loop resonators will have the advantage of easy design. Moreover, the asymmetric tapping feedline can create transmission zeros in the frequency response of the filter. In this thesis, the square and folded open-loop resonators are used to design the 2.6/3.55-GHz dual-band bandpass filters. In this thesis, the theory of the design of bandpass filter using open-loop resonators is analyzed firstly. Next, the influences of the asymmetric tapping feedline on the frequency response of the filter are studied, and the structure of dual-band bandpass filter is established. Moreover, the dual-band bandpass filters with square and folded open-loop resonators are designed and realized, respectively. Finally, the characteristics of the two dual-band bandpass filters are measured and compared with the simulation results. From the analyzed results, it is noted that both two dual-band bandpass filters have good performance. On the other hand, the dual-band bandpass filter with folded open-loop resonators not only has the comparable characteristics, but also can be reduced by 21% , as compared with the dual-band bandpass filter with square open-loop resonators.
16
Lo, Yu-Hung, and 羅友鴻. "Design of Dual-Band Bandpass Filter for WLAN Applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/92682256795294340129.
Повний текст джерелаАнотація:
碩士國立中山大學
電機工程學系研究所
102
The rapid development for the wireless communication applications is happening in the multiple bands and filters are fundamental components extensively used in microwave and millimeter-wave circuits. Recently, the use of wireless local area network (WLAN) systems has expanded rapidly, demanding more multiband applications. In this thesis, a microstrip-line dual-band bandpass filter using stub-loaded resonator (SLR) is proposed. The device has good selectivity in first pass band and wide bandwidth in second pass band. By properly adjusting the gap between source-load and SLR, good return loss at lower frequencies can be achieved. To further improve the rejection level between the first pass band and second pass band, the spur-line is etched in the coupled feeding line to produce another transmission zero at 4.3 GHz. Based on the proposed SLR, a dual-band bandpass filter with three transmission zeros is implemented. The upper stopband extends to 10.75 GHz to have good suppression below -20dB.
17
Yan-LinChen and 陳彥霖. "Design of Dual-band Bandpass Filter with Harmonic Suppression." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/32894691786252786793.
Повний текст джерела
18
Lin, Ying-hsin, and 林映忻. "Dual-Band Bandpass Filter Design Using Open-Loop Resonators." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/07457677608760990893.
Повний текст джерелаАнотація:
碩士國立中央大學
電機工程研究所
97
Dual-band filters designed for IEEE 802.11 and Bluetooth applications will be presented in this thesis. Generally, there are three main problems for filters with relatively large ratio of passband center frequencies: high insertion loss (more than 3dB), high return loss (less than -10dB) and bad selectivity. A new design of a compact dual-band bandpass filter using two different type resonators which are microstrip open-loop resonators and defected ground structure open-loop resonators is proposed and investigated in this paper. The proposed filter is composed of two bandpass filters using open-loop resonators located different metal layers and uses a way to external coupling which could have a pair of inherent zeros. By tuning zeros could control selectivity no need extra structure. A taper feed-in line could enhance external coupling to keep the response of the wider bandwidth. Since individual bandwidth and dual-band range of the proposed filter could adjust independently, the thesis will propose two dual-band bandpass filters designed for 2.4/5.2 GHz and 1.55/2.4 GHz. The measured insertion loss and return loss of 2.4/5.2 GHz application are -1.725 dB and -10.11 dB at 2.4 GHz and -1.364 dB and -24.24 dB at 5.5 GHz. The measured insertion loss and return loss of 1.55/2.4 GHz application are -1.417 dB and -16.23 dB at 1.55 GHz and -1.775 dB and -20.72 dB at 2.4 GHz, respectively. All circuits are fabricated on FR4 substrates and in good agreement with simulation.
19
Chen, Ying-Chiao, and 陳盈橋. "Design of Dual-Band Bandpass Filter with Two Path Structure and Dual-Band Antenna." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00769580564224050640.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
99
There are two parts in this thesis. The first design is the dual-band bandpass filter. Open- and short-stubs are added to two path circuit structure, the transmission zeros will be generated to increase passbands’ selectivity. The second design is a dual-band antenna, which is fed with microstrip line. Tuning the width and length of this antenna, the first resonate mode is at the frequency of 2.4 GHz and the higher resonance will located at 5.2 GHz. This dual-band planar antenna can be apply to wireless local area network (WLAN) systems for the standard of IEEE 802.11 a/b/g/n, which can cover both 2.4/5-GHz frequency bands. In addition, all above mentioned antennas are designed with the assistance of full-wave electromagnetic simulator Ansoft HFSS.
20
Huang, Wei-Shiang, and 黃威翔. "Design of a dual-band bandpass filter with a wide rejection band." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/29340423667052350983.
Повний текст джерелаАнотація:
碩士國立臺灣大學
電信工程學研究所
97
We use two methods to suppress the spurious frequency of three dual band bandpass filters in this thesis. The first 3rd dual band filter was composed of stepped impedance resonators. We can achieve dual band and a wide rejection band effectively by arranging the relationship between the base frequency and the spurious frequency skillfully. For the second filter, we introduce interdigital capacitance with stubs and open stubs to produce zeros, and try to locate these zeros in the location of the spurious frequency, therefore we also can achieve a wide rejection band. We also use open stubs to produce zeros and achieve a wide rejection band in the last filter design. The three filters have their pros and cons respectively. Users can choose the best one according to the range and specification of applications. Also, the experimental results show that our filter design is feasible.
21
Lu, Chih-Wen, and 呂志文. "Dual-Band Bandpass Filter Design Using Stepped-Impedance Coupled Resonators." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/27447375994002688085.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
95
The design of the dual-band bandpass filter using the tri-section stepped-impedance coupled resonators will have the compact size. Moreover, the defected ground structures not only can improve the performance of the filter, but also can furtherly reduce the size of the circuit. In this thesis, the tri-section stepped-impedance coupled resonators and the defected ground structures are used to design the 2.4/5.2-GHz dual-band bandpass filters. In this thesis, the theory of the design of dual-band bandpass filter using stepped-impedance coupled resonators is analyzed firstly. Next, the characteristics of U-shaped and I-shaped defected ground structures are studied. Finally, the second-order basic and miniaturized dual-band bandpass filters are designed and realized, respectively. In addition, the characteristics of these two bandpass filters are measured and compared with the simulation results. From the analyzed results, it is noted that both two bandpass filters have good performance. Furthermore, the size of the second-order miniaturized dual-band bandpass filter can be reduced about 24.63% as compared with the second-order basic dual-band bandpass filter. In other hand, the second-order miniaturized dual-band bandpass filter not only have the comparable attenuation slope in the stopband, but also can be reduced about 45.17% as compared with the fourth-order basic dual-band bandpass filter.
22
Hsu, Chih-Chan, and 許智強. "Design of Balanced Dual-Band Bandpass Filter with Coupled SIRs." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87183812294560300686.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
電信工程研究所
97
In this thesis, balanced dual-band bandpass filters (BPFs) designed using coupled stepped-impedance resonators (SIRs) are studied. Two balanced dual-band BPFs with suppressed common-mode (CM) transmission are proposed. The first balanced dual-band BPF consists of four coupled bi-section half-wavelength (λ/2) SIRs. To obtain the required differential-mode (DM) operation with a high CM rejection level, these SIRs should have the same odd-mode, but different even-mode, resonant frequencies. For that purpose, the two inner SIRs are loaded at the center with T-shaped open stubs of different dimensions so that their even-mode resonant frequencies are shifted away form those of the outer SIRs. The second balanced BPF proposed in this thesis is a simple fourth-order balanced dual-band BPF having a high CM rejection level. It consists of six conventional equal-electric-length (EEL) bi-section SIRs. These SIRs can very easily be designed using analytic formulas. The inner SIRs are designed to resonate only at the odd-mode resonant frequencies of the outer. Results obtained in this research can be applied to commercially practical WLAN systems. The techniques presented in this research are expected to serve as a useful reference for microwave filter designers in this and related research fields.
23
邱涓婷. "Design of Dual-Band Bandpass Filter With Over-Coupled Structure." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/sqdzg8.
Повний текст джерела
24
Huang, Yi-Min, and 黃譯民. "Study of a dual-band bandpass filter using patch resonator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/48505423899675776567.
Повний текст джерелаАнотація:
碩士國立屏東科技大學
機械工程系所
101
A novel dual-band bandpass filter using patch resonator for WiMAX system is designed and implemented. The response of first and second band can be controlled according to adjust the length of slit on the resonator. To enhance coupling capability by feed lines in input/output port. Furthermore, the transmission zeros can be produced to increase the selectivity of passband. The frequency of the dual-band bandpass filter is 2.12/3.19 GHz. And the operating frequency is controlled by adjusting the peripheral length. The measured results of the designed dual-band bandpass filter using patch resonator confirm the concepts of the proposed design and match the simulated results.
25
Lee, Bing Han, and 李秉翰. "60/77 GHz Millimeter-Wave Dual-Band Bandpass Filter Designs." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/12649119886663131180.
Повний текст джерелаАнотація:
碩士長庚大學
電子工程學系
100
In recent years, the global communications market booming, a large number of Microwave and Millimeter-wave (MMW) circuit technology has been applied in a wide range of communications systems. The product is unusual and makes the life is change and conventional. During the trend of times, consumers demand the lightness, thinness, shortness and minimization of portable electronics product for next to the skin, human-based and movable. Therefore, the purpose of the MMW is System-on-Chip (SoC). The composition of the basic elements of Millimeter-wave circuits is power amplifiers, low noise amplifiers, mixers and oscillators, and filters. The role includes noise filtering, harmonic interference suppression, surge absorbers, power clean, and electromagnetic interference protection signal separation. In mobile phones, satellite communications, wireless LAN and other wireless communication products, communication products involved for receiving or transmitting signals, so the product shall be added to the filter design to ensure signal quality. In this thesis, we designed the dual bandpass filter (60 GHz and 77 GHz) that used Stub-Loaded and Stepped-Impedance as the major structure. We depend on the stub loaded characterization to make transmission zeros at the pass band edge, so that the selectivity of the filter was improved. The stepped impedance microstrip resonators has also been used for the bandpass filter design. There is another researching on coupling spacing that has an impact on the bandwidth and insertion loss. The experimental results show that return loss |S11| of -18dB and insertion loss |S21| of -2.7dB。It’s implement on the GaAs pHEMT process technology with 1.5mmx1mm chip area.
26
Lai, Shih-Wei, and 賴詩薇. "New Dual-Band Bandpass Filter with Desired Flat Rejection Bands." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/12871591203928714280.
Повний текст джерелаАнотація:
碩士國立交通大學
電信工程研究所
98
A new circuit structure is proposed for design of dual-band bandpass filters. A one-stage circuit consists of two two-port networks in shunt connection; one is a coupled-line section of λ/4 long followed by a transmission line segment of identical length, and the other has the same elements but cascaded in reverse order, where λ/4 is the wavelength at arithmetic mean frequency of the two passbands. Higher-orders circuits can be obtained by directly cascading two or more such stages and show improved frequency selectivity. In addition to on both sides of the passbands, transmission zeros are also created in the rejection bands. Analysis of the one-stage circuit is formulated by the transmission line theory and design curves for one- and two-stage circuits are provided. In realization, interdigital capacitors are incorporated with the λ/4 coupled sections for compensating the effect of unequal modal phase velocities on the filter performance in the rejection band. Two circuits are fabricated and measured to validate the idea.
27
Sung, Yuan-Jyun, and 宋元雋. "Dual-Band Bandpass Filter Design Using U-Shaped Stepped-Impedance Resonators." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74973017357801852617.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
98
The design of the dual-band bandpass filter using the folded stepped-impedance resonators have several advantages, such as the adjustable spurious frequency and the compact size. In this thesis, the U-shaped stepped-impedance resonators are used to design the dual-band bandpass filters. In this thesis, the theory of the design of dual-band bandpass filter using U-shaped stepped-impedance resonators is analyzed firstly. Next, the conventional, compact and advanced dual-band bandpass filters using U-shaped resonators are designed, respectively. Finally, the compact and advanced dual-band bandpass filters are realized. In addition, the characteristics of the bandpass filters are measured. From the analyzed results, it is found that both two bandpass filters have good performance. Furthermore, the size of the compact dual-band bandpass filter can be reduced about 35% as compared with the conventional one. And, the advanced dual-band bandpass filter not only has three transmission zeros in the stopband, but also can be reduced about 52% as compared with the conventional dual-band bandpass filter.
28
Li, Man-Ho, and 李文豪. "Dual-Band Bandpass Filter Design Using Stub-Loaded Open-Loop Resonators." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/85714970651228564817.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
99
The dual-band bandpass filter designed by stub-loaded open-loop resonators will have the advantages of compact size and controllable resonant frequency. In this thesis, the stub-loaded open-loop resonators are used to design the 2.45/5.25-GHz dual-band bandpass filters. In this thesis, the theory of the design of dual-bandpass filter using stub-loaded open-loop resonators is analyzed firstly. Next, the dual-band bandpass filters with electric and mixed coupling stub-loaded open-loop resonators are designed and realized, respectively. Finally, the characteristics of the two dual-band bandpass filters are measured and compared with the simulation results. From the analyzed results, it is noted that two dual-band bandpass filters have good performance and compact sizes. Therefore, the dual-band bandpass filters designed using stub-loaded open-loop resonators are suitable for microwave communication system applications.
29
Wang, I.-Chin, and 王怡今. "Design of Balanced Dual-Band Bandpass Filter with parallel Coupled lines." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02698318548046803750.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
電信工程研究所
97
In this thesis, balanced dual-band bandpass filters (BPFs) designed using coupled stepped-impedance resonators (SIRs) are studied. Two balanced dual-band BPFs with suppressed common-mode (CM) transmission are proposed. The first balanced dual-band BPF consists of four coupled bi-section half-wavelength (λ/2) SIRs. To obtain the required differential-mode (DM) operation with a high CM rejection level, these SIRs should have the same odd-mode, but different even-mode, resonant frequencies. For that purpose, the two inner SIRs are loaded at the center with T-shaped open stubs of different dimensions so that their even-mode resonant frequencies are shifted away form those of the outer SIRs. The second balanced BPF proposed in this thesis is a simple fourth-order balanced dual-band BPF having a high CM rejection level. It consists of six conventional equal-electric-length (EEL) bi-section SIRs. These SIRs can very easily be designed using analytic formulas. The inner SIRs are designed to resonate only at the odd-mode resonant frequencies of the outer. Results obtained in this research can be applied to commercially practical WLAN systems. The techniques presented in this research are expected to serve as a useful reference for microwave filter designers in this and related research fields.
30
Yeh, Chin-Hung, and 葉晉宏. "Dual-Band Bandpass Filter Design Using Slow-Wave Open-Loop Resonators." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/7p888r.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
102
The design of the dual-band bandpass filter using the slow-wave open-loopresonators will have several advantages, such as the controllable resonant frequency and the compact size. In this thesis, the conventional and slow-wave open-loop resonators are used to design the 2.4/5.2-GHz dual-band bandpass filters. In this thesis, the characteristics of the conventional and slow-wave open-loop resonators will be analyzed firstly. Next, the theory of the design of dual-band bandpass filter using the conventional and slow-wave open-loop resonators are studied. Moreover, the dual-band bandpass filters with conventional and slow-wave open-loop resonators are designed and realized, respectively. Finally, the characteristics of the two dual-band bandpass filters are measured and compared with the simulation results. From the research results, it is found that both dual-band bandpass filters have good performance. Furthermore, the dual-band bandpass filter with slow-wave open-loop resonators not only has the better insertion loss in the passband, but also the size can be reduced about 12% as compared with the dual-band bandpass filter with conventional open-loop resonators.
31
Chen, Wen-Juei, and 陳玟叡. "Design of Compact Dual-Band Bandpass Filter Using Stub-Loaded Resonators." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5w4eug.
Повний текст джерелаАнотація:
碩士國立臺灣海洋大學
電機工程學系
106
The stub-loaded resonator has the advantages, including the easily adjustable harmonic frequency and the compact size. Besides, the dual-band bandpass filter designed by using the stub-loaded stepped-impedance resonators will easily adjust the center frequency of the second band and has the more compact size. In this thesis, the stub-loaded uniform-impedance and stepped-impedance resonators are used to design the 2.4/5.2-GHz compact dual-band bandpass filters, respectively. In this thesis, the characteristics of the stub-loaded resonators will be analyzed firstly. Next, the theory of the design of stub-loaded uniform-impedance and stepped-impedance resonators is studied. Moreover, the dual-band bandpass filters with stub-loaded uniform-impedance and stepped-impedance resonators are designed and realized, respectively. Finally, the characteristics of the two dual-band bandpass filters are measured and compared with the simulation results. From the research results, it is found that both dual-band bandpass filters have good performance. Moreover, the dual-band bandpass filter with stub-loaded stepped-impedance resonators has more adjustable parameters; it is easier to adjust the center frequency of the second band than the other one. Besides, the size of the dual-band bandpass filter with stub-loaded stepped-impedance resonators can be reduced about 13% as compared with the dual-band bandpass filter with stub-loaded uniform impedance resonators. Keywords: dual-band bandpass filter, stub-loaded resonator, uniform impedance, stepped impedance.
32
Tsai, Chun-Jen, and 蔡俊任. "Design of Inductive-Coupled Bandpass Filter and Dual-mode Ring Filter on Ka-Band." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/33066218396157671347.
Повний текст джерелаАнотація:
碩士國立臺灣大學
電信工程學研究所
90
Filters play important roles on RF/microwave applications. Many emerging applications such as wireless communication systems call for stringent requirements-- smaller size, lower cost, narrower bandwidth and higher quality factors. Two structures of filters suitable for narrowband applications are investigated in this thesis and their characteristics of frequency responses are compared. For the first structure, coplanar waveguide is selected as the transmission line and shunt stubs are selected as impedance inverters to design the inductive-coupled bandpass filters on Ka-Band. Due to the removal of the gaps, it can exhibit lower radiation loss as compared with the commonly employed capacitive-coupled filters. The second structure is based on the dual-mode ring filter which has an excellent characteristic of the controllability for the attenuation frequency. Moreover, two kinds of implementation have been investigated and their frequency responses are compared. Finally, a simple way is proposed to achieve very sharp outband-rejection by cascading two kinds of ring filters with an impedance-matching transmission line. It has the performance of four-stage filter but occupies smaller size than others.
33
Chen, Bo-Ru, and 陳柏儒. "A Dual-Band Bandpass Filter Design Using Stepped Impedance Stub-Loaded Resonators." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/25916435519033536343.
Повний текст джерелаАнотація:
碩士國立中山大學
電機工程學系研究所
104
With the popularity of modern wireless communication products, radio frequency front-end filter circuit plays a very important role, which is worthy of development and the value of research,especially multi-band pass filter.While the overall volume of the filter miniaturization is worth the effort. This paper proposes the use of a plane microstrip line resonator to design the application in the WLAN system (wireless local area network, WLAN) dual-band pass filter. Filter architecture proposed in the first band is designed at center frequency 2.45 GHz with 100 MHz bandwidth, the two sides of first passband both have transmission zero with the method of source-load coupling ,so that the passband with good selectivity. The second band designed from 5.15 GHz to 5.85 GHz, the center frequency 5.5 GHz with bandwidth 700 MHz is suitable of lots of countries in WI-FI / WLAN applications. The filter is coupled by dual-mode resonator which can use the equivalent circuit modal to analysis.By odd mode analysis , a quarter-wavelength resonator resonating at 5.5 GHz can be abstracted . By even mode analysis, a quarter-wavelength stepped-impedance resonator resonating at 2.45 GHz can be abstracted , and we can adjust impedance ratio to control spurious response .We slot resonator and insert a open stub , which is from feeding line, into resonator in order to increase the amount of coupling. And we slot feeding line with spurline to improving selectivity of second passband. By using DGS(Defect Ground Structure), rejection band response can be improved after 7 GHz.
34
Du, Tzung-han, and 杜宗翰. "Development of Low Phase Noise Dual-Band Oscillator Using Switchable Bandpass Filter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87713710613397641242.
Повний текст джерелаАнотація:
碩士國立中央大學
電機工程學系
103
Stepped-impedance resonators (SIRs) with p-i-n diodes loaded at one end are used to switch resonant condition of the stepped-impedance resonators and develop switchable bandpass filters in this paper. Due to distributed coupling technique, the advantage of low loading effect is used in switchable multi-band bandpass filter and extend to the parallel feedback oscillators as frequency selector. The switchable tri-band bandpass filter consisted of half-wavelength/quarter- wavelength resonator. Each passband is operating by a respective pair of resonators, and the three BPFs are combined by utilizing distributed coupling technique to decrease channel-to-channel loading effect. The diodes are loaded at the end of the resonators as the switching devices to independently switch the three passbands. The switchable bandpass filter mentioned above is used in parallel feedback oscillators as frequency selector to develop dual-band oscillator. The stepped-impedance resonators also reduce 30％ circuit size. To achieve a low phase noise, the oscillation frequency is designed at the peak of complex quality factor of the filter to improve the phase noise. A low phase noise dual-band oscillator is presented.
35
Shun-Hsing, Chiu, and 邱順興. "Design of Single/Dual-Band Bandpass Filter with Wide Stopband and Mutiband Antenna." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/79613091004393012716.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
100
The main propose of this thesis is based on the structure of planer microstrip line to design of single/dual band bandpass filters and multiband antenna. The first part of this thesis will introduce a single band bandpass filter. We using the step impedance coupled-line to controls the transmission zeros by changing the impedance ratio. It is analyzed by current-voltage theory to calculate the transmission zeros. This step impedance coupled-line structure can divide into three types for different circuit applications. The second part is dual band bandpass filter design. It is a structure of combine parallel coupled-line and open end coupled-line. Using interdigital capacitance compensation to solve the phase difference between the even mode and odd mode of coupled lines. In the end, we combine two single filter and add a bandstop filter in order to increase the harmonic suppression. The third part is a CPW feed triband antenna. Using a wide band antenna combining two slot resonator. We can divide into the passband that we want independently. All the above-mentioned circuits are simulated by using full-wave electromagnetic simulation. The match well results between electromagnetic simulation and measured data can evidence the availability of all proposed circuits.
36
Siang-WenLan and 藍祥文. "Design of Dual-Band Bandpass Filter With Narrow-Bandwidth and Wide-Bandwidth Responses." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/83e3p6.
Повний текст джерелаАнотація:
博士國立成功大學
微電子工程研究所
105
The dissertation is divided into four sections, comprising: (a) design of tri-band bandpass filter (BPF) by using asymmetric stub-loaded resonators (ASLR); (b) design of low-pass filter (LPF) with ultra broad stopband characteristic; (c) design of compact ultra-wideband (UWB) BPF; (d) design of dual-band BPF with narrow-bandwidth and wide-bandwidth responses. Firstly, introductions about the operation of wireless communication system and relative protocol are proposed in this research. Moreover, the feature of filters in the wireless communication system and the basic transmission line theory are discussed. Secondly, a tri-band BPF, constructed by ASLRs, is proposed. This ASLR is constructed by tapping a stub-loaded on the other uniform microstrip line. By properly tuning the electrical length ratios of the ASLRs (α and γ), the spurious modes of ASLR are controlled easily to form a tri-band response. In addition, a resonant chart of ASLR is provided to find the frequency of each spurious mode accurately. Thirdly, a LPF, constructed by rectangular stub loaded resonator and open-circuited stubs, is proposed. The rectangular stub loaded resonator consists of a parallel coupled line and a rectangular stub patch, and it creates multiple transmission zeros at higher frequency side to form a low-pass response. It is noted that the cutoff frequency of rectangular resonators is dominated by the electrical length ratio and impedance ratio. Fourthly, two UWB BPFs, basically constructed by rectangular stub loaded resonator, are fabricated and proposed. The resonant modes of one UWB BPF are excited by adopting parallel coupled line and rectangular stub loaded resonator, additionally, multiple transmission zeros created by rectangular stub loaded resonator are used to eliminate interference at the higher frequency side. And the resonant modes of the other UWB BPF are excited by using the mode-exciting technology. By properly tuning the electrical length ratio of the stub and parallel coupled-lines, a controllable resonant mode is excited and two transmission zeros are created in accordance with the results of imaginary-admittance analysis. Finally, a dual-band BPF, constructed by stepped-impedance ring loaded resonator (SIRLR) and rectangular stub loaded resonator (RSLR), is fabricated and proposed. Based on even- and odd-mode analysis, the properties of SIRLR is analyzed and predicted. Herein, three parameters (two electrical length ratios and one impedance ratio) are defined and used to control the resonant modes of SIRLR. Moreover, Three transmission zeros, created by RSLR, are located near the passband edge to improve the band selectivity and achieve a sharp cutoff skirt. The fabricated dual-band BPF exhibits good performance, including a narrow passband at 2.4 GHz, a wide passband from 3 GHz to 5GHz, low insertion loss, high passband selectivity, and broad stopband region. The designed dual-band bandpass filter are fabricated and measured, and the measured results match the theoretical prediction.
37
LAI, YOU-CAI, and 賴侑采. "Design of A Compact Dual-Band Bandpass Filter Using Asymmetric Stepped Impedance Resonators." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/k93dzt.
Повний текст джерелаАнотація:
碩士逢甲大學
通訊工程學系
105
This paper is designed in the GSM 0.9 GHz / WiFi 4.9 GHz dual band, miniaturized bandpass filter. In this paper, we use the over-coupling to combine the structure of the step impedance resonator, and use the simulated current flow direction and its strength and increase the coupling amount to determine the position of the circuit bending, the output and the input. In this paper, we use IE3D simulation software to simulate and analyze the center frequency of the two pass bands at GSM 0.9GHz / WiFi 4.9 G z, the return loss is less than 10 dB, the insertion loss is less than 6 dB, and Stopped band has 30 dB . In practice, the circuits are fabricated by using FR4 substrate, plate thickness 0.8 mm, the relative permittivity 4.4, loss tangent of 0.022, measurement using a network analyzer.
38
KUNG, SHIH-HUNG, and 龔士宏. "Design a Dual-band Bandpass Filter with Successive Frequency Transformations and Circuit Conversions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/tbfzbw.
Повний текст джерелаАнотація:
碩士逢甲大學
通訊工程學系
106
With the advancement of wireless communication, the role of filter in RF system is becoming more and more important. In design, step-impedance resonator has been widely used. In this paper, the continuous frequency conversion is applied twice, and the dual-band band pass filter is obtained from the low-pass filter. The circuit obtained after the frequency conversion is complicated, and it is not easy to realize on the high-frequency circuit. Therefore, the circuit conversion applied twice is designed to be easily realized on the FR4 board, which is a dual-band band pass filter composed of stepped impedance resonators and quarter-wavelength coupling lines. In this paper, it is designing and producing a dual-band bandpass filter with a low pass band of 1.8 GHz and a high pass band of 2.4 GHz. This paper has successfully produced a dual-band bandpass filter.
39
Lin, Lin-Fang, and 林琳芳. "Design a Miniaturized Dual-band Bandpass Filter with High Selectivity and Wide Stopband." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/39080020744450267052.
Повний текст джерелаАнотація:
碩士逢甲大學
資訊電機工程碩士在職專班
104
In recently the popular applications of wireless communication, many researchers were attracted by this topic, especially the Dual-band bandpass filter (BPF). A Dual-band bandpass filter is a device supporting frequency transformation and circuit conversion, and both the frequency selective resonators as well as the Stepped-Impedance Resonators(SIRS) can be applied with it. Besides, the unequal phase velocities between the odd-mode and even-mode are the main reason that cause spurious responses. For repairing the problem of spurious responses, coupling line is used in the microstrip circuits and Stepped-Impedance Resonators. Due to the assistance of the shifted coupled line, the complex waves can be eliminated through microstrip circuits to achieve a better effect of harmonic suppression.
40
Liang, Tang-hao, та 梁唐豪. "A Compact Dual-band Bandpass Filter Design Using Parallel Coupled λ/4 Resonators". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3jy3r4.
Повний текст джерелаАнотація:
碩士國立中山大學
電機工程學系研究所
102
This paper presents a design center frequency at 2.4GHz (for WLAN) and 3.5GHz (for WIMAX) compact size dual-band band-pass filter (Bandpass Filter). This filter uses a symmetrical structure of top and high-frequency and low-frequency resonators, operated between the two resonance frequencies of resonators with almost no impact to the design after the band easy to adjust and design, not limited to 2 times the frequency of a λ/2 resonator and 3 times the frequency of a λ/4 resonator effect. In addition, the filter coupled resonators using the newer structure, two resonators by parallel coupled structure, resulting in two modes of resonance in the frequency band you want, simply by adjusting the length of coupled microstrip lines, so its resonance at the frequency you want, easy to change design and bandwidth. But this parallel coupled structure, Source-Loading effect will produce additional capacitive to help resonance frequency falls more low frequency, and to reduce the size. Also added a short branch line near the feed end (Spur-Line) defective structure, curb outside the passband insertion loss. Filter ties in Tapped Line Feed into way, and λ/4 short-circuit transmission line (λ/4 Short Circuit) and λ/4 open transmission line (λ/4 Open Stub), in passband with sides produced transmission zero points (Transmission Zeros), improving the selective of filter and has very significantly of out of band suppression performance. Finally, band-pass filter to bend (Bend) arranged in a square structure to narrow band-pass filter size.
41
Ru-Yu, Wang, and 王茹毓. "S-band Phase-locked Loop and Wideband Bandpass Filter and Dual-band VCO for Automotive Radar Application." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d2z2ya.
Повний текст джерелаАнотація:
碩士國立臺北科技大學
電子工程系研究所
105
In this thesis, a phase-locked loop and a low-loss wideband pass filter operating in the S-band and a dual-band voltage controlled oscillator for automotive radars are proposed. These proposed circuits are fabricated in a TSMC 0.18-um RF CMOS process technology. First, a low-loss wideband bandpass filter with finite transmission zeros improve the limitation of the passive CMOS filter on the wafer and has very low insertion loss, based on the lumped-element filter, and achieve two finite transmission zeros. One is in the low band, and the other is in the high band, thus improving the selectivity significantly. The measured results show an insertion loss of 2.7 dB and a return loss better than 15 dB at 2.5 GHz. The area of the bandpass filter is 745 mm*790 mm including pads. The phase-locked loop uses three-stage differential ring oscillator to operate on the S-band. The main purpose is to enhance the locking speed and low jitter. The simulation results show the locked frequency range of 3.22 to 2.5 GHz. The lock time is about 17 us. Under a 1.8 V supply and power dissipation of 30.451 mW. The area of the phase-locked loop is 990 mm*1060 mm including pads. Second, the production of a dual-frequency oscillator operational in the K-band and W-band, and is consistent with the frequency band common to the automotive radar system. This design proposed a frequency tripling technology with push-pull architecture and a dual Tank to complete the multiplier output of the voltage controlled oscillator to achieve low power consumption. The tunable over the frequency bands are 23.4 to 27.16 GHz and 70.2 to 81.5 GHz, respectively. The main power consumption is 8.1 mW.
42
Huang, YuChuan, and 黃禹銓. "A Novel Dual Band Bandpass Filter Using Vertically Coupled Strips and Split Ring Structure." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85939696232285661956.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
電信工程研究所
96
Abstract In this thesis, we propose the new structure of dual-band bandpass filter, design the transmission zero between two passband using coupled resonators, the structure of resonator to composed by two concentric split-ring-resonators (SRRs) has negative permeability. When SRRs placed in concentric form, these have a capacitance between the coupled resonators control the transmission zero. This property has to produce the transmission zero between the two passband which controlled by the gap between two SRRs. By using the vertically coupled structure strips (VCS), the transmit path go through VCS not the substrate, and the VCS has high quality because of low loss tangent of air. In the input part of filter we replace the gap coupling with enhance coupling for the better insertion loss, but the insertion loss still lower then -5dB. And hence using the vertically coupled strip (VCS) line lower the insertion loss to -3dB. In order to make the insertion loss lower than -1dB, we add the ladder structure into the vertically coupled strip line to transmit the signal into the z-direction, the insertion loss is lower than -1dB efficiently. Finally, we design the passband in the 2.4GHz/5.2GHz respectively for the WLAN. Because of the transmission zero between the passband and the characteristic of ring, we have very narrow bandwidth which is what we desired. The fractional bandwidth of passband is 2.8% and 4.8% respectively. The fractional bandwidth of traditional dual-band bandpass filter is about 10%, using the vertically coupled strip structure reduce the bandwidth more than 50%.
43
Chiu, Ping Wen, and 邱炳文. "The Development of Dual-band Bandpass Filter and 1.8GHz GaN HEMT Low Noise Amplifier." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35650566529079388293.
Повний текст джерелаАнотація:
碩士長庚大學
電子工程學系
98
This thesis describes the design, implementation of dual-band band-pass stepped impedance filter and 1.8GHz AlGaN/GaN HEMT low noise amplifier. About the dual-band band-pass stepped impedance filter, it first was made by using frequency mapping to transform low-pass filter into band-pass filter and calculate the inductance and capacitance. And then, we used the structure of short-ended stepped impedance resonator to design the dual-band band-pass filter which the pass-bands (3.5GHz、5.8GHz) and bandwidths are controllable. This filter has the characteristic of wide bandwidth. The 1.8GHz low noise amplifier was designed by using AlGaN/GaN high electron mobility transistor. There are two stages in the amplifier. I did my best to reduce the noise figure in first stage and increase the output gain in second stage. A 50Ω low-pass filter matching networks was used for input terminal. Two suitable high-pass matching filters are applied for intermediate and output terminals. A high gain and a low noise performance were obtained for AlGaN/GaN HEMT LNAs.
44
Lee, Lio, and 李相興. "Design of 2.4/5.2 GHz Dual-Band Bandpass Filter using Stub-Loaded Microstrip Line Resonator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77556323950340439939.
Повний текст джерелаАнотація:
碩士長庚大學
電子工程學系
99
In recent years, the global communications market booming, a large number of microwave circuit technology has been applied in a wide range of communications systems. The composition of the basic elements of microwave circuits is RF amplifiers, filters, mixers and oscillators, and the filter. The role includes noise filtering, harmonic interference suppression, surge absorbers, power clean, and electromagnetic interference protection signal separation. In mobile phones, satellite communications, wireless LAN and other wireless communication products, communication products involved for receiving or transmitting signals, so the product shall be added to the filter design to ensure signal quality. In this thesis, we will cover the wireless LAN band (2.4 GHz and 5.2 GHz) dual-band bandpass filter. The architecture of the filter is included Stub-Loaded and SIRs. The Stub-Loaded can be tuned the bandwidth of filter and the SIRs can be adjustable the main frequency of filter. Finally, we used the input structure to increase the zero of filter for improvement the characteristics. The filter has insertion loss (S21) of -3dB and reflection loss (S11)of -17dB using FR4 substrate with 33 mm 30 mm chip size.
45
陳柏匡. "Dual-Band Bandpass Filter Design Using Stub-Loaded Stepped-Impedance Resonators and Defected Ground Structures." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69949109051730682027.
Повний текст джерела
46
chang, Chia-hao, and 張家豪. "The Design and Fabrication of a Microwave Dual-Band Bandpass Filter for 802.11a/b/g Applications." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08443550971021660152.
Повний текст джерелаАнотація:
碩士南台科技大學
電子工程系
97
In this thesis, designs and implementations of microwave dual-band band pass filters are investigated for the wireless local area networks (WLAN), namely IEEE 802.11a/b/g applications. The technologies of rectangular ring resonators and step-impedance resonators are employed in the filter designs. The microstrip line and coplanar waveguide (CPW) structures are used for the fabrications. Here, two microwave dual-band band pass filters are designed and fabricated. One is based on step-impedance resonators and is fabricated by using Rogers RT5880 substrate. The filters are designed to operate at 2.4/5.2 GHz and 2.4/5.7 GHz, respectively. The insertion loss is less than 0.7 dB and the return loss is larger than 20 dB for the 2.4/5.2 GHz filter. The bandwidths are 330 MHz and 360 MHz for the 2.4 GHz and 5.2 GHz bands, respectively. Also, the insertion loss is less than 0.67 dB and the return loss is larger than 31 dB for the 2.4/5.7 GHz filter. The bandwidths are 300 MHz for the 2.4/5.7 GHz bands. The other is based on the ring resonators and step-impedance resonators structure and is fabricated by using Rogers RT6010 substrate. This CPW filter is designed to operate at 2.4/5.2 GHz. The insertion loss is less than 1.73 dB and the return loss is larger than 13.2 dB at 2.4 GHz. The insertion loss is less than 2.1 dB and the return loss is larger than 13.9 dB at 5.7 GHz. The bandwidths are 120 MHz and 260 MHz for the 2.4 GHz and 5.2 GHz bands, respectively. In this thesis, the proposed two filters are designed, simulated, implemented and measured in sequel. The results show that the simulations and measurements are quite matched and the designs can meet the requirement of the IEEE 802.11a/b/g specifications, therefore, the fabricated filters are suitable for the WLAN applications.
47
Hsu, Pei-Chun, and 徐培鈞. "Design of CMOS 60-/77-GHz Millimeter-Wave Dual-Band Bandpass Filter Using Broadside-Coupled Resonators." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/83646960876012775639.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
電子工程學系
99
This thesis presents the design of a dual-band millimeter-wave bandpass filter using a TSMC 0.18-μm CMOS standard process. This filter is mainly applied to IEEE 802.15 wireless personal area network, 60 GHz WirelessHD, and 77 GHz automotive radar. The proposed multilayer broadside-coupled structure uses the upper two layers (the sixth and the fifth metal layers) as the circuit layers, and the bottom layer (the first metal layer) as the ground plane. The two resonators of different lengths are placed in different circuit layers to achieve a dual-band bandpass characteristic. The first passband (60 GHz) corresponds to the first mode of the resonator residing at the sixth metal layer. The resonator is fed with a zero-degree feeding structure which can produce a pair of transmission zeros at both edges of the passband. This results in good passband selectivity. The second passband (77 GHz) is produced by the lower half-wavelength resonator at the fifth metal layer. The two resonator designed at layers five and six are broadside-coupled. This kind of multilayer broadside-coupled resonator structure can fully utilize the multilayer’s feature of CMOS process to reduce circuit size. Control of the coupling between resonators can easily be performed and this increases the flexibility of circuit design. The simulated insertion losses of the passband at 60 and 77 GHz are about 3.89 and 2.23 dB, respectively, and the return losses of the above two bands are 42.5 and 25 dB, respectively.
48
Yeh, Lung-kai, and 葉隆凱. "Design of 2.4/5.2-GHz Microwave and CMOS 24/60-GHz Millimeter-wave Dual-Band Bandpass Filter Using Dual-Behavior Resonator." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97966519175040063606.
Повний текст джерелаАнотація:
碩士國立成功大學
電腦與通信工程研究所
96
This thesis presents the research on dual-band bandpass filters for 2.4-/5.2-GHz WLAN application and 24-/60-GHz vehicular radar system and WPAN applications. The first part presents some designs based on the stepped impedance resonators (SIRs) theory and the dual-behavior resonator (DBR) concept. The SIRs applied to the dual-band filter design can control second passband by adjusting the impedance ratio and electric lengths of SIRs. The SIRs are also applied to the structure of DBRs. DBRs are composed of the parallel combination of several different open-ended stubs structures. The second part presents the design and implementation of a 24/60-GHz millimeter-wave dual-band on-chip bandpass filter using a 0.18-µm standard CMOS process. The concept of quarter-wave-length stepped impedance resonator (λ/4 SIR) is utilized to realize stopband characteristics at desired frequencies and size reduction. The structure of the open-circuited dual-behavior resonators (OC-DBRs) produces one passband with two transmission zeros on either side. The simulated and measured results are in good agreement. The fabricated CMOS filter chip size is 1.03 0.59 mm2. The measured insertion loss of the passband at 24 and 60 GHz is about 3.6 and 2.8 dB, respectively, and the return loss is better than 15 and 10 dB, respectively. The rejections in the stopbands are all lower than -20 dB.
49
Chuang, Wei-Min, and 莊偉閔. "Design of Planar Six-Port Crossover With Two Cascoded Rings and Defected Ground Structure Dual-Band Bandpass Filter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9fj7wk.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
103
In the first study, A six-port crossover have been proposed in this thesis. Analytical equations of the circuit are derived by using the even-odd mode and the sixfold symmetry methods. By the approach of cascoding two rings with quarter-wavelenth branches, the six-port crossover can be implemented greatly. Moreover, based on the derived formulas, the software ADS is used to calculate the performance for selecting line impedance, investigated on the predetermined operational bandwidth. For experimental verification, the presented crossover has a bandwidth of 13.5% for 15dB return loss. Compared with the other previously reported, it has feature for wide operational bandwidth and compact size. The second part is design the dual-band bandpass filters with DGS(Defected Ground Structure) resonators. Combining the two DGS resonators, the results of dual passbands can be obtained. In addition, the use of tapped input/output and adjust the gap between two DGS resonators can achieve the simultaneously matching among the designated passbands. This filter is simulated with full-wave electromagnetic simulator HFSS, and the prototype of the bandpass filters are fabricated and measured. Comparing with simulated results and experimental data, we can find that the measured results can match well with the EM simulation
50
Li, Chung-Lin, and 李忠霖. "Design of Dual-band bandpass Filters." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/49740455532629757903.
Повний текст джерелаАнотація:
碩士義守大學
電機工程學系碩士班
95
Dual-band filter of the multi-resonance will occupy a large amount of circuit surface. This paper will present dual band filter design on single resonance. The resonator structure of coupling filter use stepped impedance resonator (SIR) with anti-parallel coupling, over coupling, whole structure coupling method and parallel coupling structure to compare for transmission zero and reject bandwidth. In order to retrench the time of analyze the structure of resonators, this thesis use Coupling Coefficient method. This method can synthesize the required filter under different circuit, only re-simulation the frequency responded and the coupling coefficient for resonator. Compare various kinds of coupling structure to find that anti-parallel coupling method. It can generate one transmission zero and compact resonator. The over coupling method can generate three individual transmission zero in the high and low pass band side and the stop band center that can shorten the altogether horizontal length of the resonator. The whole structure coupling method can generate transmission zero at both sides in each pass band. The each pass band that separates to each other can have more attenuation bandwidth. This length of resonance structure is equal to the length of resonator and can reduce the occupy area of PCB.