Dissertations / Theses on the topic 'Aperture coupled patch antenna'
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Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.
Full textVlasits, Tamas. "Modelling and application of a cross-aperture coupled single feed circularly polarised patch antenna." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245262.
Full textOkuducu, Yusuf. "Dual Band Microstrip Patch Antenna Structures." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606859/index.pdf.
Full text-15 dB are designed, manufactured and measured. A dual-band aperture coupled stacked microstrip patch antenna operating at 1.8 GHz with 3.8% bandwidth and at 2.4 GHz with 1.6% bandwidth is designed, produced and measured for mobile phone and WLAN applications. In addition, an aperture coupled stacked microstrip patch antenna which operates at PCS frequencies in 1.7-1.95 GHz band is designed. Dual and circularly polarized stacked aperture coupled microstrip patch antennas are also investigated. A triple band dual polarized aperture coupled stacked microstrip patch antenna is designed to operate at 900 MHz, at 1.21 GHZ and at 2.15 GHz. Mutual coupling between aperture coupled stacked microstrip patch antennas are examined and compared with the coupling of aperture coupled microstrip patch antennas
Robinson, Bryan. "Mathematical modelling of aperture coupled patch antennas with multi-layered superstrates." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245239.
Full textIseri, Kadir. "Analysis Of Dual-polarized Aperture-coupled Microstrip Antennas With H-shaped Slots And Equivalent Circuit Modeling Of H-shaped Slots." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614527/index.pdf.
Full text. The v designed dual-polarized wideband aperture-coupled microstrip antenna is manufactured. Simulation results and measurement results are compared. During the equivalent circuit modeling of an H-shaped slot fed by a microstrip line, an approach based on the reciprocity theorem is utilized. The method was originally proposed for rectangular shaped slots, in this thesis it is generalized for arbitrarily shaped slots. Software codes are developed in MATLAB to calculate the equivalent impedance of the slot.
Goksu, Mesut. "Analysis Of Slot Coupled Patch Antennas Using Closed Form Green." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610996/index.pdf.
Full texts functions is presented. Slot coupled patch antennas are fed by a microstrip open stub which is coupled to the patch through an electrically small slot. Current distributions over the microstrip line, slot line and the patch are represented by rooftop basis functions. First, a relatively simple structure, microstrip coupled slot line is investigated using the proposed technique. Then the method is extended to the slot coupled patch antenna geometry. By using the method, current distributions on the feedline and the patch are calculated for a generic slot coupled patch antenna. Then by using the distributions, return scattering parameters of the antenna is approximated with complex exponentials using Prony&rsquo
s method. A parametric study is carried out to observe the effect of each antenna component on the antenna performance. Current distributions and return loss calculations are repeated for modified antennas to observe and demonstrate the performance differences. All simulations are verified using HFSS®
software and the results available in the literature.
Jacmenovic, Dennis, and dennis_jacman@yahoo com au. "Optimisation of Active Microstrip Patch Antennas." RMIT University. Electrical and Computer Engineering, 2004. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060307.144507.
Full textKacar, Merve. "Direct Digital Manufacturing of Multi-layer Wideband Ku-band Patch Antennas." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7411.
Full textBílek, Ondřej. "Flíčkový reflektor s elektronickým řízením směrové charakteristiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316447.
Full textGUGLIANDOLO, GIOVANNI. "Applications of Microwave Resonators to Thermal Metrology." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2849028.
Full textFilice, Francesco. "Solutions innovantes d'antennes en bande Ku- et Ka- en technologie d’impression 3-D pour la réalisation des réseaux phasés visant des applications 5G et des communications mobiles par satellite." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4023.
Full textThe increasing use of mobile applications leads to a growing demand for higher data-rates and low-cost mobile telecommunication solutions. While 5G networks are still at their early stages, a central role can be played by the mobile satellite telecommunications (Sat-Com-On-The-Move). The frequency bandwidth available at Ku- (10.75-14.5 GHz) and Ka- (18-31 GHz) bands for these applications can be leveraged in order to provide worldwide, high-speed and low-cost internet connections. Companies like SpaceX are actually deploying large satellite constellations required to work at Low Earth Orbits and offer such services. Nevertheless, the price and the form factor of the traditional motorized reflector-based user terminals remain the main bottlenecks in order to make these technologies affordable to the mass-market consumers. The limited operational bandwidth of the radiating elements integrated in their low-profile alternatives (i.e. slotted waveguide antenna arrays) actually obliges to split transmission (Tx) and reception (Rx) in two different panels, keeping a relatively high cost for the end-users. The objective of this thesis is to develop innovative low-cost and wideband antenna solutions, notably microstrip aperture coupled patch and double ridged waveguide antennas, to be respectively realized by standard Printed Circuit Board (PCB) and metal 3-D printing. These antennas are meant to cover the whole Ku- and Ka- band in order to allow the creation low-profile Sat-Com-On-The-Move user terminals able to perform both Rx and Tx using a single antenna panel. A particular attention is given to the possibility to integrate these radiating element in small arrays to be used as unit cell for the realization of larger ones, envisaging the possibility to achieve the levels of gain required by this kind of telecommunications
Civerolo, Michael Paul. "Aperture Coupled Microstrip Antenna Design and Analysis." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/300.
Full textBelentepe, Bilge. "Electromagnetically coupled microstrip patch antenna array design." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/842825/.
Full textZubir, Farid. "Direct integration of push-pull amplifier and aperture coupled antenna." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6454/.
Full textRevankar, U. K. "Three-Layer Electromagnetically Coupled Circular Microstrip Antennas." Thesis, Indian Institute of Science, 1995. http://hdl.handle.net/2005/241.
Full textIrci, Erdinc. "Low-Profile Wideband Antennas Based on Tightly Coupled Dipole and Patch Elements." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316456337.
Full textTasoglu, Ali Ozgur. "Analysis And Design Of Cylindrically Conformal Microstrip Antennas." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613441/index.pdf.
Full textKřivák, Jiří. "Analysis of feeding techniques of a patch antenna array for 5G NR." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-449165.
Full textYildirim, Meltem. "Design Of Dual Polarized Wideband Microstrip Antennas." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612023/index.pdf.
Full text1880 MHz) is designed. Before manufacturing the antenna, dimensions of the antenna are re-tuned by considering a finite sized ground plane in the simulations. Finally, the antenna is manufactured and measured. An acceptable agreement is obtained between the measurement and the simulation results.
Pulipati, Sravan Kumar. "Electronically-Scanned Wideband Digital Aperture Antenna Arrays using Multi-Dimensional Space-Time Circuit-Network Resonance." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1499440141479455.
Full textGuerra, Leonard. "IEEE 802.11b wireless LAN sensor system and antenna design." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001713.
Full textLiu, Lei. "Investigation of aperture coupled microstrip antenna to obtain a high efficient active integrated antenna by using Class F and Inverse Class F power amplifiers." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/21425/.
Full textLiyakath, Riaz Ahmed. "Reconfigurable Antenna and RF Circuits Using Multi-Layer Stretchable Conductors." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4130.
Full textMikulášek, Tomáš. "Mikropáskové flíčkové antény napájené vlnovodem integrovaným do substrátu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233587.
Full textLin, Chung-Chu, and 林忠助. "Design of Micromachined Wideband Aperture Coupled Microstrip Patch Antenna." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/02144213947617591218.
Full text國立臺北科技大學
機電整合研究所
89
In this thesis, the characteristics of wide band aperture coupled microstrip patch antennas (MPAs) is studied. First, we conduct the basic theoretical analysis of the aperture coupled MPA. We use the full-wave numerical analysis method that has higher accuracy to understand the whole process of analysis. The purpose is to build up foundation of theoretical analysis for wide band aperture coupled MPA. Then, we design a series of the S-band aperture coupled MPA. The cheaper and more available FR4 PCB substrate is used to layout the element of antenna. These antenna structures consist of (a) the traditional aperture coupled MPA, (b) the wide band aperture coupled MPA with a air layer, and (c) the wide band aperture coupled stacked MPA. The simulations and the experimental measurements is used to study the characteristics of these antenna structures, in terms of parameters for the variations of resonant frequencies and input impedance with antenna. The bandwidth of the traditional aperture coupled MPA is measured to be only about 3 %. The bandwidth of the wide band aperture coupled MPA with a air layer is measured to be about 14 %, and maximum antenna gain of 7.7 dBi. The bandwidth of the wide band aperture coupled stacked MPA is measured to be about 33 %, and maximum antenna gain of 7.51 dBi. Next, we design Ka-band wide band aperture coupled MPAs based on the simulation software tool. These antenna structures consist of (a) the wide band aperture coupled MPA with an etched cavity, (b) the wide band aperture coupled stacked MPA. We design these antenna based on micromachined process. Finally, one of the designed Ka-band wide band aperture coupled MPAs has been produced on silicon wafers by using the micromachining technique. The bandwidth (defined as having a return loss of less than —10 dB) of the micromachined wide band aperture coupled MPA is measured to be over 50 %.
Chen, Wei-Jen, and 陳威任. "Design of A Two-Dimensional Amplifying Antenna Array Using Multi-Ported Aperture-Coupled Patch Antennas." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43205645809279608852.
Full text國立交通大學
電信工程系
90
This thesis proposes a novel circuit-fed two-dimensional amplifying array using the multi-ported aperture-coupled patch antennas. Power coupling between the patch and feed circuit is through the apertures etched on the ground plane. This array is formed by reproductively connecting three basic cells, each with a multi-ported aperture-coupled patch antenna and some with one or two amplifiers, in sequence like stacking the LEGO blocks, so that a beam-shaped and high-gain amplifying array can be constructed quite quickly. An X-band 4×3 elements array with uniform excitation distribution is demonstrated in this study. The measured return loss of the designed array is below -10 dB in the frequency range from 10 GHz to 10.7 GHz, and shows a resonant frequency of 10.33 GHz. The measured peak gain of the amplifying array comes to 27.7 dBi. The H-plane patterns of the array possess a half-power beamwidth of 14 degrees and a side-lobe level of -11 dB, while the E-plane patterns possess those of 16 degrees and -6 dB, respectively.
Kuan, Hua-Ling, and 關華凌. "Two-Directional Scanning by Using Short Leaky-Wave Antenna Integrated with Aperture Coupled Patch Antenna Phase Array." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50997717880444311222.
Full text國立交通大學
電信工程系
89
First, we present a two-directional scanning method by using a short leaky-wave antenna (LWA) integrated with aperture coupled patch antenna array on the bottom of the substrate. The aperture coupled patch antenna array is connected to the open end of the leaky-wave antenna. Such design offers another radiation path of the reflected wave and thus suppresses the power of reflected wave. The beam of the patch antenna array on the bottom plane can be steered by tuning individual phase-shifter connected to the patch antenna. The beam of the LWA is dominated by the frequency of input signal. Therefore, the two beams of individual direction can be steered independently. Experimental result shows that the suppression of the reflected wave can be 10 dB at 10.5 GHz with a short LWA length of 6cm (2 wavelengths). The results of return loss reveal that the bandwidth of the short LWA is extended by the proposed structure. Secondly, we propose another two-directional scanning topology that is realized by using a short leaky-wave antenna integrated with aperture coupled LWA on the bottom of the substrate. The topology then can accomplish multi-beam scanning and can also suppress the reflected power. The two-directional scanning of two different radiation patterns on different planes provides more flexibility in beam scanning and has great potential in many applications.
Chang, Wei-Chun. "Investigation of waveguide-fed, slot and aperture-coupled-patch antennas." 2001. https://scholarworks.umass.edu/dissertations/AAI3012121.
Full textKim, David G. "Design of Stripline-Fed Dual Polarization Aperture-Coupled Stacked Microstrip Patch Phased Array Antenna for Wideband Application." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8567.
Full text洪天富. "Study of Aperture-coupled Stack Antenna with Minkowski island-based Fractal Patch for Circular Polarization Operation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/15203252048070565967.
Full text逢甲大學
電機與通訊工程博士學位學程
102
The dissertation presents fractal theories, experiments and antenna design for Minkowski-island-based (MIB) fractal patch and complementary Minkowski-island-based (CMIB) fractal patch. Two antennas are discussed in this dissertation. The first antenna is a compact single-feed stack antenna consisting of a MIB fractal patch with perturbation element for circular polarization (CP) application, also proves the MIB fractal which can reduce antenna&;#39;s area. The second antenna is a single-feed stack antenna consisting of a complementary MIB (CMIB) fractal patch with perturbation element for dual-band and dual circular polarization applications, also presents a new transformation which can be expressed in mathematical form for complementary MIB fractal. Three steps for antenna design are as follow: first, to use fractal theories as designing rules such as fractal dimension, fractal iteration, and to use a mathematical form as being expressed MIB and CMIB fractal geometries. Second, by using commercial software of ANSYS HFSS to analysis antenna&;#39;s features such as AR spectrum, current distribution, radiation patterns, and reflection coefficient. Finally, experiment, verify and discuss by an investigation on those antenna&;#39;s features. The antenna configuration is makeed with double-layer FR4 glass-fiber board. The lower layer is fed by a 50Ω microstrip line with aperture-coupled to the upper fractal patch. The upper layer is fractal patch, and using perturbation element to excite orthogonal mode for CP operation.
Nien-An, Kao, and 高念安. "Active Aperture-Coupled Leaky-Wave Antenna." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/86577771140409809941.
Full text國立交通大學
電信工程系
87
This thesis will investigate the active aperture-coupled leaky-wave antennas and the multi-beam aperture-coupled leaky-wave antenna, including design, fabrication and measurement. To excite the microstrip first higher mode, the aperture-fed structure is utilized and a sequence of covered wire is added in the center of this antenna to suppress the dominant mode. The leaky-wave antenna offers beam-steering capability, high gain and narrow main beam. In addition, the aperture-fed structure reduces the circuit size and offers an excellent shielding between active and radiation elements. We produce two kinds of active aperture-coupled leaky-wave antennas-side-fed with a single main beam and center-fed with a dual-beam. The side-fed one provides a 16°scanning angle in H-plane from 8.97 GHz to 9.5 GHz and its maximum EIRPs are 21.98±1.59 dBm. The center-fed one provides a 20°scanning angle in H-plane from 8.97 GHz to 9.5 GHz and its maximum EIRPs are 18.56±0.33 dBm for the right beam and 18.9±0.13 dBm. Theses antennas are suitable for active phase antenna array applications or other microwave transceiver system. On the other hand, we utilized the aperture-fed leaky-wave antenna to develop a multi-beam antenna. Its transmitting and receiving radiation patterns are observed their scanning angles as 22°and 16°~18°respectively. This antenna has a developmental potential in transmit/receive modules such as smart antenna systems because both modules employ use only one antenna.
GAO, YI-TAO, and 高易韜. "Series-fed aperture-coupled microstrip antenna array." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/89241900093145098936.
Full textHuang, Chien-Hsiung, and 黃建雄. "PARALLEL APERTURE-COUPLED DUAL-BAND CIRCULARLY POLARIZED ANTENNA." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67838891277471199597.
Full text大同大學
通訊工程研究所
99
This thesis presents a parallel feed line which couples diamond-shaped slot to ring and cross-slot to patch. The feed line is used to feed the two parts in parallel. Then, the structure can easily be operated as a dual-band circularly polarized antenna to cover both (0.902GHz~0.928GHz and 2.4GHz~2.5GHz) bands. Simulated and measured results indicate that the proposed antenna can achieve good circularly polarized radiation performance.
Chen, Chin-Yi, and 陳晉毅. "DUAL L-SHAPED APERTURE COUPLED WIDEBAND CIRCULARLY POLARIZED ANTENNA." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90041576368597294826.
Full text大同大學
通訊工程研究所
101
An aperture-coupled patch antenna is presented. The aperture is composed of two L-shaped-like slots and is proximately-fed by an L-shaped-like strip. The L-shaped-like strip is first coupled to the first slot through its vertical arm , then serially coupled to the second slot through its horizontal arm. The length of the vertical and horizontal arms of the L-shaped strip are found highly correlated to the axial- ratio bandwidth of the antenna. The center frequency in the return-loss plot of the antenna is also influenced by the two lengths. The optimized antenna has a return-loss bandwidth of 19.6 % (2.26-2.75 GHz) and an axial-ratio bandwidth of 16 % (2.3-2.7 GHz).
Majeed, Asmaa H., Abdulkareem S. Abdullah, Fauzi Elmegri, Khalil H. Sayidmarie, Raed A. Abd-Alhameed, and James M. Noras. "Aperture-Coupled Asymmetric Dielectric Resonators Antenna for Wideband Applications." 2014. http://hdl.handle.net/10454/8422.
Full textA compact dielectric resonator antenna (DRA) for wideband applications is proposed. Two cylindrical dielectric resonators which are asymmetrically located with respect to the center of a rectangular coupling aperture are fed through this aperture. By optimizing the design parameters, an impedance bandwidth of about 29%, covering the frequency range from 9.62 GHz to 12.9 GHz, and a gain of 8 dBi are obtained. Design details of the proposed antenna and the results of both simulation and experiment are presented and discussed.
Song, Yunpeng. "Radiation pattern of aperture coupled prolate hemispheroidal dielectric resonator antenna." Thesis, 2004. http://spectrum.library.concordia.ca/8393/1/MR04400.pdf.
Full textZebiri, Chemseddine, Mohamed Lashab, D. Sayad, Issa T. Elfergani, Khalil H. Sayidmarie, F. Benabdelaziz, Raed A. Abd-Alhameed, Jonathan Rodriguez, and James M. Noras. "Offset Aperture-Coupled Double-Cylinder Dielectric Resonator Antenna with Extended Wideband." 2017. http://hdl.handle.net/10454/13087.
Full textA compact dielectric resonator antenna for ultra-wideband vehicular communication applications is proposed. Two cylindrical dielectric resonators are asymmetrically located with respect to the center of an offset rectangular coupling aperture, through which they are fed. Optimizing the design parameters results in an impedance bandwidth of 21%, covering the range from 5.9 to 7.32 GHz in the lower-band and a 53% relative bandwidth from 8.72 to 15 GHz in the upper-band. The maximum achieved gain is 12 dBi. Design details of the proposed antenna and the results of both simulations and experiment are presented and discussed.
Chen, Shang-Jen, and 陳尚仁. "A Cavity-Fed Slot-Coupled Feed Network for Patch Antenna Arrays." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/73972366878513808733.
Full text國立暨南國際大學
通訊工程研究所
92
Conventional corporate design has been extensively used for the feed network of microstrip patch arrays. Uniform amplitude and phase to each element are required to achieve the goal of maximum gain. However, for large arrays, this design suffers the problem of low efficiency caused by the ohmic loss, the dielectric loss, and the parasitic radiation in the feed network. A novel feed work using cavity-fed and slot-coupled techniques for microstrip patch arrays is proposed in this thesis. Each array element is fed by a cavity in resonant mode through slot coupling. The entire design does not require any coplanar feeding structures to the array elements, therefore, excludes the possibility of causing the aforementioned losses. A single patch antenna with the proposed feeding structure is designed. Finite element method (FEM) is selected to calculate the required dimensions for optimum coupling. The results can be extended to the feed network for patch antenna arrays.
Zhu, F., S. Gao, A. T. S. Ho, Raed A. Abd-Alhameed, Chan H. See, T. W. C. Brown, J. Li, G. Wei, and J. Xu. "Ultra-Wideband Dual-Polarized Patch Antenna with Four Capacitively Coupled Feeds." 2014. http://hdl.handle.net/10454/8490.
Full textA novel dual-polarized patch antenna for ultra-wideband (UWB) applications is presented. The antenna consists of a square patch and four capacitively coupled feeds to enhance the impedance bandwidth. Each feed is formed by a vertical isosceles trapezoidal patch and a horizontal isosceles triangular patch. The four feeds are connected to the microstrip lines that are printed on the bottom layer of the grounded FR4 substrate. Two tapered baluns are utilized to excite the antenna to achieve high isolation between the ports and reduce the cross-polarization levels. In order to increase the antenna gain and reduce the backward radiation, a compact surface mounted cavity is integrated with the antenna. The antenna prototype has achieved an impedance bandwidth of 112% at (|S11| ≤ -10 dB) whereas the coupling between the two ports is below -28 dB across the operating frequency range. The measured antenna gain varies from 3.91 to 10.2 dBi for port 1 and from 3.38 to 9.21 dBi for port 2, with a 3-dB gain bandwidth of 107%.
IEEE Antennas and Propagation Society
陳柏州. "Design of Aperture Coupled Tri-polarization Antenna and Dual Planar Inverted-F Tri-polarization Antenna." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/64966525199777868040.
Full text國立交通大學
電信工程研究所
101
A design of aperture coupled tri-polarization antenna is presented in the first part of this thesis. By integrating an aperture coupled-fed antenna and a branch line coupler, the proposed antenna can provide a linear polarization and a pair of orthogonal circular polarizations, realizing the switchable tri-polarization characteristics. Since the phase difference and magnitude from two output ports of the branch line coupler varies by frequency, the polarization characteristic will also be changed. Since the branch line coupler provides two output signals with the same magnitude and 90° phase difference, RHCP and LHCP can therefore be generated by switching two input ports. Also, when the two input ports are fed simultaneously with equal phase, a linear polarization can be obtained. This mechanism can be applied at operation frequency and three times the operation frequency of the branch line coupler. In the second part of this thesis, another structure is presented by using a pair of Planar Inverted-F Antenna (PIFA) to achieve the switchable polarization characteristics. Due to its quarter wavelength resonant characteristic, the equivalent electrical length is reduced, therefore reduces the overall antenna size. In this part, the mechanism of polarization diversity is the same as first part, however, this structure can be operated at the operation frequency and three times the operation frequency of the branch line coupler, and both have switchable tri-polarization characteristics. In the end of the thesis, we introduce the sequential rotation method antenna array, and do some experiments in order to further improve the dual PIFAs' circular polarization bandwidth and beamwidth. The design principles and the polarization mechanisms of proposed antennas will be further discussed in our research of this thesis.
Majeed, Asmaa H., Abdulkareem S. Abdullah, Fauzi Elmegri, Khalil H. Sayidmarie, Raed A. Abd-Alhameed, and James M. Noras. "Dual Segment S-Shaped Aperture-Coupled Cylindrical Dielectric Resonator Antenna for X-Band Applications." 2015. http://hdl.handle.net/10454/7885.
Full textA new low-cost dual-segmented dielectric resonator (DR) antenna design is proposed for wideband applications in the X-band region. Two DRs coupled to an S-shaped slot introduce interesting features. The antenna performance was characterized in terms of the reflection coefficient, gain, and radiation pattern, and detailed simulation studies indicate excellent antenna performance from 7.66 GHz to 11.2 GHz (37.5% fractional bandwidth) with a maximum gain of 6.0 dBi at 10.6 GHz while the fabricated prototype has a matched bandwidth from 7.8 GHz to 11.85 GHz (41% fractional bandwidth) and maximum gain of 6dBi. The antenna is compact, size 1 x 0.83 x 0.327 time the wavelength at 10 GHz. The two DR segments may be located on the same side or on opposite sides of the substrate, giving respectively improved gain or more uniform field patterns. Experimental testing of the prototype performance showed reasonable agreement with the predicted performance.
Jiang, Jing-Hae, and 江經海. "ENHANCE GAIN AND BANDWIDTH OF CIRCULARLY POLARIZED MICROSTRIP PATCH ANTENNA USING GAP-COUPLED METHOD." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/59518322504711129839.
Full text大同大學
通訊工程研究所
97
In this thesis, one 3x3 and one 5x5 antenna arrays are studied. In each array, one probe-fed circularly polarized (CP) microstrip patch antenna is placed at the center as the driven antenna and is gapped coupled to the remaining elements. It is investigated that CP gain of the proposed antenna can be enhanced by properly arranging size and spacing of/between these parasitic elements. The driven patch is a perturbed square one with two diagonal corners truncated. The remaining elements are square patches slightly smaller than driven one. The proposed antennas have been constructed and measured. The 3x3 array has an average gain of 7.7dBic over a 3dB axial ratio bandwidth of 3.3%. The 5x5 array has an average gain of 9.3dBic over a 3dB axial ratio bandwidth of 8.1%.
Chan, Yi-lin, and 詹易霖. "ANTENNA COVERING THE WHOLE LTE BANDS WITH A BACKSIDE STRIP COUPLED TO A DRIVEN PATCH." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01030664332509134166.
Full text大同大學
通訊工程研究所
103
This thesis provides a mobile phone antenna to cover 704MHz-2690MHz. The size of antenna is 45 × 22.5 mm2 and the thickness is 0.8mm on FR4 substrate. This antenna is constituted by the front-side monopole and back-side meandered strip, the meandered strip divided into two parts: the first part apply as a matching circuit, the other part resonant for the frequency of 704MHz, 1405MHz and 2100MHz, the resonant frequency 1050MHz, 1970MHz and 2690MHz is generated by a monopole antenna. The monopole and the meandered strip coupling make the working frequency wider which can replace a multi-band antenna. The use of coupled fed design covers the existing LTE operating frequency and conforms to most system application of the present smart phone, which operating band are LTE (704 MHz ~ 746MHz), LTE (824 MHz ~ 894MHz), LTE (880 MHz ~ 960MHz) and high-band LTE (1710 MHz ~ 2690MHz), and the other provides 5 bands to be covered with seven receiving systems (GSM-850 and GSM-900, DCS-1800, PCS-1900, UMTS, GPS, and IEEE 802.11b).
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed, Ammar H. Ali, F. Falcone, and E. Limiti. "Study on isolation improvement between closely-packed patch antenna arrays based on fractal metamaterial electromagnetic bandgap structures." 2018. http://hdl.handle.net/10454/18131.
Full textA decoupling metamaterial (MTM) configuration based on fractal electromagnetic-bandgap (EMBG) structure is shown to significantly enhance isolation between transmitting and receiving antenna elements in a closely-packed patch antenna array. The MTM-EMBG structure is cross-shaped assembly with fractal-shaped slots etched in each arm of the cross. The fractals are composed of four interconnected-`Y-shaped' slots that are separated with an inverted-`T-shaped' slot. The MTM-EMBG structure is placed between the individual patch antennas in a 2 × 2 antenna array. Measured results show the average inter-element isolation improvement in the frequency band of interest is 17, 37 and 17 dB between radiation elements #1 & #2, #1 & #3, and #1 & #4, respectively. With the proposed method there is no need for using metallic-via-holes. The proposed array covers the frequency range of 8-9.25 GHz for X-band applications, which corresponds to a fractional-bandwidth of 14.5%. With the proposed method the edge-to-edge gap between adjacent antenna elements can be reduced to 0.5λ 0 with no degradation in the antenna array's radiation gain pattern. Across the array's operating band, the measured gain varies between 4 and 7 dBi, and the radiation efficiency varies from 74.22 and 88.71%. The proposed method is applicable in the implementation of closely-packed patch antenna arrays used in SAR and MIMO systems.
Partially supported by innovation programme under grant agreement H2020-MSCA-ITN-2016 SECRET-722424 and the financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E022936/1.
Chang, Hung-Chia, and 張紘嘉. "Combination of Series and Parallel Feeding Network with 60-GHz High-Gain and Wideband Aperture Coupled Feed Patch Array." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/43494651457524798454.
Full text國立中山大學
電機工程學系研究所
104
In recent years, the development of wireless communication systems has grown rapidly, and the requirement of high data rate is also soaring significantly. To meet the requirements of high speed data rate transmission, the IEEE defined the standard of 802.11ad for new wireless communication technology. It uses the 60-GHz band to provide wireless communication. However, the range of millimeter wave propagating in air is short. In order to overcome this disadvantage, high gain antennas are required. In this thesis, we propose the patch antenna array which has the property of high gain and wideband operating from 57 to 66 GHz. Traditional patch antenna has the advantages of high radiation efficiency and low profile. The high radiation efficiency has superiority for high propagating attenuation in the 60-GHz band. But, the bandwidth of patch antenna is only less than 5%. Regarding this, we apply aperture coupled feed and the bandwidth is extended to more than 8%. However, the traditional aperture coupled feed structure has an air layer and the air layer can only be implemented by ion implantation and razer process, both of these two processes cost a lot. To avoid expensive fabrication cost, we adopt stacked structure to replace the original design (with the air layer) and maintain the performances. The request of bandwidth is about 15% of the band from 57 to 66 GHz. Considering that we need to achieve wideband and high gain performances simultaneously, we utilize the stronger coupling between neighbor elements of series-array, to enhance bandwidth to 20%. In the meantime, the gain performance is also improved to 8.2dBi on 1x2 series-array from 6dBi on a single antenna. Moreover, comparing with parallel-array, series-array feeding network is much simpler and easy to design. The gain enhancement is not as good as parallel-array feeding network design when we increase antenna elements to series-array feeding network design directly. Therefore, we combine both series and parallel feeding network, and design a 4x4 aperture coupled feed path array with the properties of easy fabrication, wideband and gain performance reaches 15dBi.
Tseng, Shih-Chi, and 曾士齊. "A Multi-Function, Multi-Band and Miniaturized Shared-Aperture Patch Antenna with High Isolation for Both IoT and WIFI Applications." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j22n5y.
Full text國立交通大學
電信工程研究所
107
Currently, the gateways on the market are mainly products with WIFI communication function. WIFI uses two major frequency bands of 2.45GHz and 5.5GHz. With the rise of the Internet of Things, NB-IoT communication function is going to be combined. The frequency bands used by NB-IoT communication function are 700MHz, 900MHz, 1800MHz, of which 700MHz corresponds to the longest wavelength, the design area is the most difficult to be miniaturized. This paper presents an Aperture-coupled miniaturized multi-band patch antenna. This design can be used in the communication applications of gateways in the future for WIFI and Internet of Things. The requirements include multi-band, omnidirectional radiation pattern, high gain, area miniaturization design and high isolation. However, the traditional monopole antenna and PIFA antenna can not meet the requirements of both omnidirectional and high gain. Therefore, the design of this paper is based on the microstrip patch antenna. Firstly, the aperture coupled feed method is used to match the H-shaped radiator. Reducing the area of the 700MHz radiator and providing a wider bandwidth than the antenna fed by the traditional microstrip line, and then placing the high-band radiator into the low-band antenna through the concept of shared-aperture. In the groove, the coupling of the slot holes is perpendicular to the polarization direction, which narrows the distance between the radiators in each frequency band and reduces the coupling degree between the antennas. This method achieves the trade-off between cost reduction and area miniaturization and high isolation. And then fed into the matching circuit design combined with the transmission line theory and the filter principle, and further solved the problem of mutual interference between frequency bands. Finally, the physical field measurement is used to verify that the antenna has multi-band, high gain, small area and high isolation. In this paper, the multi-band antenna is integrated with the antenna size , the thickness is 4mm,working frequency726-783MHz, 2.36-2.6GHz and 4.96-6.1GHz, which is a three-layer board structure, using FR4 substrate, which is lower in cost and simple than the previous antenna manufacturing. In this paper, the antennas have 1.5dB, 3.2dB and 4.85dB gains in each of the three frequency bands, and the mutual coupling between the antennas is below -46dB, which enables them to have excellent radiation performance in each frequency band after miniaturization. To meet the needs of gateway antennas in future IoT and WIFI applications.
Merola, Christopher S. "Resonant Antennas Based on Coupled Transmission-Line Metamaterials." 2011. https://scholarworks.umass.edu/theses/629.
Full textChung, KL. "Investigation into the design of broadband singly-fed electromagnetically coupled patch (EMCP) antenna elements and arrays for circular polarisation." Thesis, 2004. http://hdl.handle.net/10453/29349.
Full textThe rapid development of satellite and wireless communications pose extraordinary demands on broadband circularly polarised (CP) antenna elements and high-performance antenna arrays. The use of high-dielectric-constant materials as the substrate for the driven layer and a low-dielectric-constant material as superstrate for the radiating patch overcomes the conflict between circuit integration and antenna radiation. The aim of the research presented in this thesis is to design and develop high performance singly-fed microstrip patch antennas and arrays for CP applications. Firstly, we introduce a singly-fed cross-aperture coupled patch antenna and a stacked patch antenna using high and low dielectric materials known as Type-F and Type-E elements, respectively. As the physical structure of the Type-E element is close to the conventional linearly-polarised electromagnetically coupled patch (LP-EMCP) antennas, we have also denoted it as CP-EMCP antenna. The development of CP-EMCP antennas addresses the drawbacks of the cross-aperture patch antenna. A systematic optimisation method is developed for the design of CP-EMCP elements, at which the mean frequencies of the bandwidths can be adjusted in order to achieve a wide overlaid bandwidth. Secondly, we investigate the effects of perturbation on the parasitic patch, layer displacements, material tolerances and superstrate thicknesses on the broadband performance as well as the mutual coupling of the CP-EMCP elements. Both our theoretical and experimental results show that the CP-EMCP elements are robust in performance and have a low mutual coupling. When compared to the conventional stacked EMCP antennas and to the reduced surface-wave antenna, the mutual coupling between CP-EMCP elements is lower which allows the use of small element spacings to avoid grating lobes, which therefore make these elements good candidates for high-performance CP arrays. Following a parametric study on the effect of displacements between stacked patches and the loss consideration of the coplanar feed network printed on high dielectric constant substrates, the modified Type-E elements whose parasitic patch have a zero perturbation are developed for the design of high performance CP arrays. The low mutual coupling allows short feed-lines to connect with the spatially offset elements so as to minimise the feed loss. Consequently, it became possible to develop the novel sequentially rotating feed networks which incorporate the modified elements with a small element spacing of 2/3/λₒ for the 4- and 16-element planar antenna arrays. The results indicate that these arrays have high gain, low axial ratio, high antenna efficiency low sidelobe levels, and wide overlaid bandwidth.