Tesi sul tema "Slot antenna arrays"
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Voigt, Dewald. "Computational investigation of a crossed slot cavity-backed array antenna". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2659.
Testo completoThis thesis investigates a computational model of an electronically steered antenna array. It focuses on a simple element comprising an S-shaped, crossed, cylindrical cavity-backed slot antenna. An unusual aspect of the element is the addition of a top hat, which contributes to the low scanning ability of the array. The objective was to confirm this contribution of the top hat. During the investigation, the computation code Feko was validated for slot analysis through consideration of the basic properties of a dipole and slot and how they related to each other. Various alternative models were evaluated, before a final accurate model was modelled in Feko, to find possible equivalent models. The final model, which implemented the use of Feko as release 5, was the only one that achieved successful results. The results showed that the top hat does play an important role in the steering of the beam. The mechanism through which this occurs was identified. The results that where obtained indicated that there may be more effective elements than the cylindrical element and the identification of this is proposed as a field for further study.
Mustafa, Incebacak. "Design Of Series-fed Printed Slot Antenna Arrays Excited By Microstrip Lines". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612447/index.pdf.
Testo completot require high power levels with having advantage of easy integration with microwave front-end circuitry. In this thesis, design and analysis of microstrip line fed slot antenna arrays are investigated. First an equivalent circuit model that ignores mutual coupling effects between slots is studied. A 6-element array is designed by using this equivalent circuit model. From the measurement and electromagnetic simulation results of this array, it is concluded that mutual coupling effects should be considered in order to achieve a successful design that meets the design specifications related to the main beam direction and sidelobe levels of the antenna. Next, an improved equivalent circuit model proposed for stripline fed slot antenna arrays is studied. It is observed that, the mutual coupling effects are incorporated into the equivalent model through the utilization of active impedance concept. Finally, the design equations proposed in the improved equivalent circuit model are derived for the microstrip line fed slot antenna array structure. To demonstrate the validity and the accuracy of the derived design equations, results obtained by the proposed analysis method are compared with simulation and measurement results. It is concluded that the proposed method successfully predicts the radiation pattern of the array by including the mutual coupling effects.
Öjefors, Erik. "Integrated Antennas : Monolithic and Hybrid Approaches". Doctoral thesis, Uppsala University, Department of Engineering Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7142.
Testo completoThis thesis considers integration of antennas and active electronics manufactured on the same substrate. The main topic is on-chip antennas for commercial silicon processes, but hybrid integration using printed circuit board technology is also addressed.
The possible use of micromachining techniques as a means of reducing substrate losses of antennas manufactured on low resistivity silicon wafers is investigated. Compact dipole, loop, and inverted-F antennas for the 20-40 GHz frequency range are designed, implemented, and characterized. The results show significantly improved antenna efficiency when micromachining is used as a post-processing step for on-chip antennas manufactured in silicon technology.
High resistivity wafers are used in a commercial silicon germanium technology to improve the efficiency of dipole antennas realized using the available circuit metal layers in the process. Monolithically integrated 24 GHz receivers with on-chip antennas are designed and evaluated with regard to antenna and system performance. No noticeable degradation of the receiver performance caused by cross talk between the antenna and the integrated circuit is observed.
For low frequency antenna arrays, such as base station antennas, hybrid integration of active devices within the antenna aperture is treated. A compact varactor based phase shifter for traveling wave antenna applications is proposed and evaluated. Electrically steerable traveling wave patch antenna arrays, with the phase shifters implemented in the same conductor layer as the radiating elements, are designed and manufactured in microstrip technology. It is experimentally verified that the radiation from the feed network and phase shifters in the proposed antenna configuration is small.
Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.
Testo completoZhang, Shuai. "Investigating and Enhancing Performance of Multiple Antenna Systems in Compact MIMO/Diversity Terminals". Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116402.
Testo completoQC 20130121
EU Erasmus Mundus External Cooperation Window TANDEM
Farias, Roger Lorenzoni. "Antenas de microfita dupla-faixa para aplicações em estações rádio-base de telefonia móvel celular". Universidade Federal do Pampa, 2014. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/250.
Testo completoMade available in DSpace on 2015-05-09T22:22:58Z (GMT). No. of bitstreams: 1 126110018.pdf: 3775876 bytes, checksum: 4a58f20709bf7c39682924a84079246d (MD5) Previous issue date: 2014-09-08
Neste trabalho, são apresentadas diferentes técnicas que possibilitam a obtenção de característica dupla-faixa para antenas de microfita especificamente voltadas para aplicações em estações rádio-base de telefonia móvel celular no Brasil. As faixas de frequência de interesse encontram-se no intervalo de 0,824 GHz a 0,960 GHz para a banda inferior e 1,710 GHz a 2,165 GHz para a banda superior. Além de atender as especificações técnicas de faixa de passagem, devem ser atendidos os requisitos de coeficiente de reflexão, polarização, ganho, largura de feixe de irradiação e impedância de entrada na faixa de interesse. Primeiramente, para obtenção de antenas de microfita com característica multibanda, descreve-se a técnica em que são dispostas fendas nos elementos irradiadores, onde são estudadas três topologias de antenas, explicando-se os princípios de funcionamento e destacando-se as particularidades de cada geometria. As três antenas são analisadas e projetadas com o auxílio do software comercial de simulação eletromagnética Ansoft Designer ® , visando levantar os parâmetros elétricos através de diversos estudos paramétricos em função da variação das dimensões das antenas para compreender melhor o comportamento de cada estrutura simulada. A antena com elemento irradiador em forma de H foi a única que cumpriu os requisitos em termos de faixa de passagem e diagramas de irradiação para operação em sistemas de telefonia móvel celular. No entanto, esta geometria resultou em dimensões físicas consideráveis, pois necessita da utilização de múltiplas camadas dielétricas, acarretando em um protótipo de volume considerável e de elevado custo de produção. Outra técnica estudada foi a sobreposição de elementos irradiadores, porém a mesma não é investigada detalhadamente em função de o custo de produção da antena ser mais elevado em comparação a topologias coplanares. Em seguida, uma técnica com irradiadores em fenda anelar e dupla alimentação é proposta. A antena é projetada considerando-se duas portas independentes, uma para cada banda de operação, formando uma antena de dois acessos altamente isolados. Simulações com o software HFSS TM mostraram que é possível satisfazer as especificações para operação em estações rádio-base de telefonia móvel celular. A grande vantagem desta estrutura é a possibilidade de utilização de apenas um laminado de micro-ondas, o que reduz o custo de produção em comparação a outras topologias. Protótipos foram construídos e caracterizados experimentalmente para validar o projeto realizado no simulador eletromagnético. Constatou-se a presença de discrepâncias entre os resultados simulados e medidos. Após simulações paramétricas, verificou-se que o processo de construção alterou a geometria do protótipo em relação ao modelo de simulação. Após a inclusão das imperfeições do processo construtivo no modelo, foi possível estimar as mudanças necessárias no protótipo. Após os devidos ajustes realizados em bancada, os resultados medidos exibiram boa concordância com a previsão teórica. Por fim, realizou-se um estudo de viabilidade da utilização da antena em fenda anelar dupla-faixa para composição de uma rede de antenas para estações rádio-base. A análise teve como principal objetivo verificar a possibilidade de síntese de diagramas de irradiação em forma de cossecante ao quadrado em ambas as bandas de operação. Excelente resultado foi obtido para a banda inferior, enquanto que algumas limitações foram encontradas na banda superior.
In this work we present different techniques for achieving the dual-band feature for microstrip antennas aimed to be used in the mobile communication base stations of Brazil. The focused frequency range for lower and higher bands is in the 0.824-0.960 GHz and 1.710-2.165 GHz intervals, respectively. In addition to comply with the technical specifications, the solution is also supposed to meet the requirements of return loss, polarization, gain, beamwidth radiation and input impedance in the focused frequency range. Initially, in order to obtain microstrip antennas with dual-band characteristic, we describe the technique in which slots are placed in the irradiating elements. Three antenna topologies are analyzed in its operation principles, emphasizing the particularities of each geometry. The antennas are designed with support of Ansoft Designer ® , a commercial software that simulates electromagnetic features, in order to find out the electrical parameters through parametric studies and to better understand the behavior of each simulated structure. These studies considered the variation in the dimensions of antennas. The H-shaped microstrip antenna was the only one able to fulfill the requirements of bandwidth and irradiation diagrams for operation in mobile communication. However, this geometry originated an antenna of considerable physical dimensions, because it requires the use of multiple dielectric layers, resulting in a prototype of considerable volume and high production cost. Another technique studied was the stacking of irradiating elements. However it isn’t investigated in detail because of the production cost of the antenna, which is higher than the ones of coplanar topologies. After all that, we propose a technique based in annular-slot antennas and double feed. The antenna is designed considering two independent ports, one for each band of operation, making an antenna of two highly insulated accesses. Simulations by the HFSS TM software have shown that it’s possible to comply with the specifications for operation in base stations of the mobile communication. The biggest advantage of this structure over other topologies is that it may be made of only one microwave laminate, reducing the production cost. Prototypes were built and measured to validate the design in the electromagnetic simulator. It was noted the discrepancies between the simulated and measured results. After running parametric simulations, we found out that the building process of the prototype changed the geometry of the simulation model. We included these imperfections in the model and it was possible to estimate the necessary changes in the prototype. After inclusion of the adjustments, the measured results behaved just alike the theoretical prediction. Finally, we’ve done a feasibility study on the use of the dual-band annular slot antenna for making an array of antennas for base stations. The study aimed to verify the suitability of synthetizing squared-cosecant shaped pattern in both operation bands. We got excellent results for the lower band, although some limitations were found for the higher band.
Ng, Kwong-Tai. "Admittance properties of a slot array with parasitic wire arrays in a stratified medium /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487259580262744.
Testo completoLundin, Andreas. "Interference and Energy Conservation in Phased Antenna Arrays and Young’s Double Slit Experiment". Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-188035.
Testo completoMcknight, James W. "A cavity-backed coplanar waveguide slot antenna array". [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003299.
Testo completoGrbic, Anthony. "A novel leaky millimeter-wave linear slot antenna array". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58792.pdf.
Testo completoMcCann, John Forrest. "On the design of large bandwidth arrays of slot elements with wide scan angle capabilities". Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1209590321.
Testo completoDogan, Doganay. "Dual Polarized Slotted Waveguide Array Antenna". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613016/index.pdf.
Testo completo35 degrees in elevation. It also has a usable bandwidth of 600 MHz.
Paryani, Rajesh. "DESIGN OF A WIDEBAND DUAL-POLARIZED CAVITY BACKED SLOT ANTENNA". Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2832.
Testo completoPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
Noghanian, Sima. "Field solution for dielectric and ring loaded annular slot array antennas". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62661.pdf.
Testo completoEshrah, Islam A. "Waveguide and metaguide excitation of dielectric resonator antenna arrays using slots and probes /". Full text available from ProQuest UM Digital Dissertations, 2005. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1267222711&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1184857149&clientId=22256.
Testo completoMeng, Xiangjun. "A synthesis technique for radial line slot array antennas with isoflux radiation patterns". Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28325.
Testo completoAbdel, Rahman Mohamed. "ANTENNA-COUPLED TUNNEL DIODES FOR DUAL-BAND MILLIMETER-WAVE/INFRARED F". Doctoral diss., University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2597.
Testo completoPh.D.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering
Caswell, Eric D. "Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes". Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/25963.
Testo completoPh. D.
Guerra, 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.
Testo completoTong, Chin Hong Matthew. "System study and design of broad-band U-Slot microstrip patch antennas for aperstructures and opportunistic arrays". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Dec%5FTong.pdf.
Testo completoThesis Advisor(s): David C. Jenn, Donald L. Walters. Includes bibliographical references (p.83-85). Also available online.
Almhmadi, Raed Ali M. "Optical True Time Delay Device for mm-Wave Antenna Array Beamforming". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1566073503380698.
Testo completoSedláček, Petr. "Štěrbinová anténní řada na bázi vlnovodu integrovaného do substrátu". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219844.
Testo completoQassim, K. A. S. "Optimisation of focal plane arrays for microwave imaging : printed Yagi, dielectric rod and constant width slot antennas are investigated and optimised for close stacking in focal plane arrays intended for microwave imaging". Thesis, University of Bradford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320761.
Testo completoŠtumpf, Martin. "Pulzní elektromagnetické záření štěrbinových antén". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233527.
Testo completoŠpůrek, Jan. "Textilní štěrbinová anténa". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242116.
Testo completoMiřácký, Jan. "Návrh anténní jednotky přístupového bodu pro off-body komunikaci v ISM pásmu 61 GHz". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221250.
Testo completoCheng, Shi. "Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems". Doctoral thesis, Uppsala universitet, Mikrovågs- och terahertzteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-111197.
Testo completowisenet
Alfonso, Alós Esperanza. "New quasi-TEM waveguides using artificial surfaces and their application to antennas and circuits". Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/11073.
Testo completoAlfonso Alós, E. (2011). New quasi-TEM waveguides using artificial surfaces and their application to antennas and circuits [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/11073
Palancia
Weigel, Filip. "Rekonfigurovatelná štěrbinová anténní řada". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242136.
Testo completoZHENG, RUI-GING, e 鄭瑞清. "Slot-coupled microstrip antenna arrays". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/19959493304377062070.
Testo completoJeng, Jing-Feng, e 鄭謹鋒. "Design of Tapered Slot Antenna Arrays". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/65710230559578687583.
Testo completo國立交通大學
電信工程系
88
The tapered slot antenna arrays were integrated the single element of the tapered slot antenna (TSA) on E- or H-plane. Therefore, the characteristics of the TSA will be made a review and discussed. The measured results of the single element of TSA with corrugated edges will be presented and compared with the single element of TSA to realize the effects of corrugated edges. We will introduce the bilateral fin-line fed linear tapered slot antenna (LTSA) and comparing the measured results with the unilateral fin-line fed LTSA to design a TSA which has high gain and low cross polarization level. Finally, the LTSA arrays of two different feeding structures will be proposed. The design procedures and the characteristics of the LTSA arrays will be discussed.
Del, Río Del Río David. "Characterization of log periodic folded slot antenna array /". 2005. http://grad.uprm.edu/tesis/delriodelrio.pdf.
Testo completoWood, Ian. "Linear tapered slot antenna for imaging arrays". Thesis, 2007. http://hdl.handle.net/1828/283.
Testo completoKim, Young-Sik. "Linearly tapered slot antenna arrays for multibeam systems". 1988. https://scholarworks.umass.edu/dissertations/AAI8822670.
Testo completoTseng, Chen-Chia, e 曾振家. "Design of the Antipodal Linearly Tapered Slot Antenna Arrays". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/29271273695321060749.
Testo completo國立交通大學
電信工程系
90
In this thesis, design of an 8×8 Antipodal Linearly-Tapered Slot Antenna array (ALTSA array) for Ka band (26.5~35 GHz) is presented. The array is power divided by an 1×8 H-plane rectangular waveguide power divider in H-plane, by an 1×8 balanced microstrip line power divider in E-plane. Besides, we adopted antipodal fin line to construct the transition between waveguide and microstrip line. The center frequency of the array is designed to be 30 GHz, and the gain is about 30 dBi. Simulation of most of our design is mainly by Ansoft/HFSS 8.0 and some by Ansoft/Ensemble 8.0.
鄭世杰. "Design of 5GHz antipodal linearly-tapered planar slot antenna arrays". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/93159687242115560801.
Testo completo樹德科技大學
電腦與通訊研究所
91
This thesis presented the design of 5GHz antipodal linearly-tapered slot antenna (ALTSA) array using three-dimensional (3-D) finite element method (FEM). Both of single element and arrays of ALTSA with different parameters are studied. The printed ALTSA arrays have been implemented by using the FR-4 PCB substrate. For the single ALTSA, good agreements between simulation and measurement on input VSWR (about 1.3) and antenna directivity (about 12dBi) are achieved in the range of 5~6 GHz. For the ALTSA arrays, it could be found that, although with narrower HPBW, the directivity is slightly greater when the number of antenna element increases. But it could only be operated effectively in a narrower range of frequency (5.7~5.85GHz). There exists a trade-offs between antenna gain and bandwidth. The designed single element and arrays of ALTSA can be used for 5GHz communication system , such as the local point to point transmission between the buildings.
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed e E. Limiti. "High performance on-chip array antenna based on metasurface feeding structure for terahertz integrated circuits". 2019. http://hdl.handle.net/10454/18118.
Testo completoIn this letter a novel on-chip array antenna is investigated which is based on CMOS 20μm Silicon technology for operation over 0.6-0.65 THz. The proposed array structure is constructed on three layers composed of Silicon-Ground-Silicon layers. Two antennas are implemented on the top layer, where each antenna is constituted from three sub-antennas. The sub-antennas are constructed from interconnected dual-rings. Also, the sub-antennas are interconnected to each other. This approach enhances the aperture of the array. Surface waves and substrate losses in the structure are suppressed with metallic via-holes implemented between the radiation elements. To excite the structure, a novel feeding mechanism is used comprising open-circuited microstrip lines that couple electromagnetic energy from the bottom layer to the antennas on the top-layer through metasurface slot-lines in the middle ground-plane layer. The results show the proposed on-chip antenna array has an average radiation gain, efficiency, and isolation of 7.62 dBi, 32.67%, and -30 dB, respectively.
H2020-MSCA-ITN-2016 SECRET-722424 and the financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E0/22936/1
Chen, Shang-Jen, e 陳尚仁. "A Cavity-Fed Slot-Coupled Feed Network for Patch Antenna Arrays". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/73972366878513808733.
Testo completo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.
Tsai, Jen-Kuei, e 蔡仁貴. "Dual-Band Slot Antenna Arrays Based on Composite Right-/Left-Handed Transmission Lines". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/s875kw.
Testo completo國立臺灣大學
電信工程學研究所
105
In this thesis, four dual-band broadside antenna arrays incorporated with composite right-/left-handed (CRL H) microstrip lines are proposed. Two of them are designed for linear polarization, while the others are for circular polarization. All of the antenna arrays are based on slot antenna and with adequate gain. First, for linear polarization, linear arrays arranged along H-plane and E-plane directions are designed, respectively. Both arrays are composed of four slot antenna elements. In order to achieve broadside radiation, elements should be fed with in-phase excitation. This in-phase requirement should be satisfied at both operating bands. By combining CRLH transmission lines (TLs) with ordinary TLs to realize the array feeding network, the in-phase requirement can be achieved simultaneously at both desired bands. Besides, the CRLH TL can also be used to realize an equal power divider with 180 phase difference at both bands. This power divider is later on applied in the E-plane array. Second, for circular polarization (CP), two array designs are proposed with respectively the same and opposite handedness of CP at the two desired bands. The CRLH TLs are used to design the feeding network that provides 90 or 270 phase difference between adjacent perpendicular elements according to the handedness of CP. All the simulated and measured results are in good agreement.
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed, F. Falcone e E. Limiti. "Silicon-based 0.450-0.475 THz series-fed double dielectric resonator on-chip antenna array based on metamaterial properties for integrated-circuits". 2019. http://hdl.handle.net/10454/18132.
Testo completoThe antenna array designed to operate over 0.450-0.475 Terahertz comprises two dielectric resonators (DRs) that are stacked vertically on top of each other and placed on the surface of the slot antenna fabricated on a silicon substrate using standard CMOS technology. The slot created in the silicon substrate is meandering and is surrounded by metallic via-wall to prevent energy dissipation. The antenna has a maximum gain of 4.5dBi and radiation efficiency of 45.7% at 0.4625 THz. The combination of slot and vias transform the antenna to a metamaterial structure that provides a relatively small antenna footprint. The proposed series-fed double DRs on-chip antenna array is useful for applications in THz integrated circuits.
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/E0/22936/1.
Bartlett, Chad. "Design of an 8x8 cross-configuration Butler matrix with interchangeable 1D and 2D arrays". Thesis, 2019. http://hdl.handle.net/1828/10989.
Testo completoGraduate
2020-07-17
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed, F. Falcone e E. Limiti. "Surface wave reduction in antenna arrays using metasurface inclusion for MIMO and SAR systems". 2019. http://hdl.handle.net/10454/18126.
Testo completoAn effective method is presented for suppressing mutual coupling between adjacent radiating elements which is based on metasurface isolation for MIMO and synthetic aperture radar (SAR) systems. This is achieved by choking surface current waves induced over the patch antenna by inserting a cross-shaped metasurface structure between the radiating elements. Each arm of the cross-shaped structure constituting the metasurface is etched with meander-line slot (MLS). Effectiveness of the metasurface is demonstrated for a2×2antenna array that operates over six frequency sub-bands in X, Ku and K-bands. With the proposed technique, the maximum improvement achieved in attenuating mutual coupling between neighbouring antennas is: 8.5 dB (8-8.4 GHz), 28 dB (9.6-10.8 GHz), 27 dB (11.7-12.6 GHz), 7.5 dB (13.4-14.2 GHz), 13 dB (16.5-16.8 GHz) and 22.5 dB (18.5-20.3 GHz). Furthermore, with the proposed technique (i) minimum center-to-center separation between the radiating elements can be reduced to 0.26λ0, where λ0 is 8.0 GHz; (ii) use of ground-plane or defected ground structures are unnecessary; (iii) use of short-circuited via-holes are avoided; (iv) it eliminates the issue with poor front-to-back ratio; and (v) it can be applied to existing arrays retrospectively.
H2020-MSCA-ITN-2016 SECRET-722424 and the financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E0/22936/1
Nalumakkal, Priya Suresh. "Ultrawideband and wide-angle scan antenna element and small active phased arrays". Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6157.
Testo completoYin, Ching-Yu, e 殷崇禹. "The Study of Dual-Band Slot Antenna and Slot Antenna Array". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/49891097272044972574.
Testo completo國立交通大學
電信工程系
88
In this report, we present the study of a dual-band (2.45GHz and 5.78GHz) slot antenna. And also development of a design 2.45GHz slot antenna arrays. In the first part, we present a novel dual-band microstrip-fed slot antenna for wireless communication systems at 2.45GHz and 5.78GHz. The first higher order modes of a slot antenna is utilized to create the dual-band antenna characteristic. The slot antenna is originally designed to radiation at 2.45GHz. By adding a stub at the ground plane, we can create another resonant frequency at 5.78GHz. We also integrate it with a band separator, so we can precisely measure the transmitting and receiving signals. We can conclude the dual-band microstrip-fed slot antenna is suitable for transceiver system by measured results. In the second part, 2.45GHz parallel feeding slot antenna array is investigated. Compare the bandwidth and power combining ability of series feeding slot microstrip-fed slot antenna, the parallel feeding microstrip-fed slot antenna, the later has wider bandwidth and larger power combining ability. Therefore, a set of 2 -element slot antenna array and set of 4-element slot antenna array are studied in this design. Good agreement has achieved between the theoretical and measured results.
Huang, Tzung-Fang, e 黃宗訪. "CPW-fed slot and microstrip antenna analysis and slot antenna array design". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/15328082494886303293.
Testo completo國立臺灣大學
電機工程學研究所
87
Slot and slot-coupled patch antennas fed by the coplanar waveguide are investigated by using the full-wave analysis based on the Galerkin''s moment method in the spectral domain approach in this dissertation. The coupling slot is etched on the conducting plane of the coplanar waveguide and placed in the direction perpendicular to the transmission line. The equivalent magnetic currents in the coupling slot and in the slots of the coplanar waveguide are all expanded by the subsectional rooftop basis functions, while the equivalent surface electric current density on the microstrip antenna is represented by the entire domain basis functions if necessary. These equivalent currents are solved by the full-wave analysis using the Galerkin weighting procedure, and the reflection coefficient is extracted from the magnetic current distribution on the coplanar waveguide utilizing the matrix pencil technique. All the theoretical results are verified by the measurements and the comparisons show a good agreement between them. Investigation begins with a wide slot antenna fed by a coplanar waveguide. To model the wide slot accurately, the transverse magnetic current component is introduced and more than one longitudinal components are used across the slot. With this study, we can realize how to model the equivalent magnetic current to get a good agreement between theory and experiment. The variations of the characteristics of the inductive or capacitive slot antennas with parameters such as the slot width, slot length, and center strip width of the coplanar waveguide are presented and their corresponding variations in the bandwidth and the resonant frequency are also discussed. The spectral domain Green''s functions and the method of Stationary Phase are also used to calculate the front-to-back radiated power ratio for the CPW-fed slot antenna on a single dielectric substrate. A very simple formulation for the front-to-back radiated power ratio is obtained by assuming that the substrate and metalization is infinite in extend. With this formula, the substrate thickness and dielectric constant can be chosen and designed properly for CPW-fed slots. The same research for the inductive and capacitive patch antenna fed by the coplanar waveguide are also studied in this dissertation. There are more variable parameters such as the slot width, slot length, patch width, and patch length for us to design the patch antenna. The variations of the bandwidth and the resonant frequency with different parameters are also compared to each other. Finally, a simplified procedure for designing the slot antenna array excited by a coplanar waveguide is proposed. Moment method analysis and matrix pencil approach are adopted to calculate the scattering parameters and hence the self-admittance of each slot. The mutual admittances between the slots are calculated from the formulas derived for the complementary strip dipoles based on the reciprocity theorem and via Booker''s relation. Then the transmission line theory is used to calculate the input impedance of the array, and an iterative process is employed to obtain a matched design for a desired slot voltage distribution. A four-element slot array is fabricated and measured using this design procedure. Calculated results are in good agreement with measurements.
Wu, Kuo-Hsi, e 吳國璽. "Design of CPW-Fed Slot Array Antenna". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/96093995052093374540.
Testo completo國立臺灣大學
電信工程學研究所
87
The demand for wireless communication is experiencing unprece- dented growth. Smart antennas generally consist of an antenna array combined with signal processing and are used mainly for high-performance wireless system. So the design of the antenna array is more and more important. The purpose of this study is to design a cpw-fed slot antenna array with a large number of elements. A carefully synthesized large array can suppress the side lobes of its radiating pattern. In our design, we analyze the self- and mutual- admittances of the slots in the array first. Then the transmission line theory is used to calculate the input impedance of the array, and an iterative process is employed to obtain a matched design and the required sizes of the slots for a desired slot voltage distribution. Arrays with various number of elements are designed using this procedure at 7GHz, 14GHz and 22GHz. In all the cases, test pieces are carefully fabricated and measured to verify our design.
Tsai, Yi-Ting, e 蔡伊婷. "Circularly polarized tapered slot antenna array design". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/35759996389483571277.
Testo completo國立彰化師範大學
電子工程學系
104
In this paper, the design of the antenna, is divided into three main structures: half-wave dipole antenna (with BALUN), branch-line coupler, and fermi arrays antenna. The first structure is a half-wave dipole antenna (with BALUN), as the lumped port, and adjusting the size of the triangle under the antenna impedance matching results. The second structure is a branch-line coupler, the phase difference of 90 degrees features, so the antenna has a positive and negative polarity of the two properties. The third structure is a fermi arrays antenna, with its tapered slot features to the energy conducting out.
紀權洲. "Design of the wideband slot array antenna". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/48731075881746965960.
Testo completo明新科技大學
電子工程研究所
95
Abstract In this thesis, the printed rectangle slot antenna is designed by T-shaped microstrip-fed method. Otherwise, we discuss and analysis about the broadband characteristics. The printed rectangle slot antennas are all using microstrip-line-fed method that can let the printed rectangle slot antenna has the characteristic of simple structure. Additionally, in order to increase the bandwidth and gain of antenna, we design the Two-element and Four-element T-shaped microstrip-fed printed rectangle slot antennas dividedly; we test and verify the characteristics of high frequency and broad band for designed antennas by real practices. In this thesis, we research the single T-shaped microstrip-fed printed rectangle slot antenna firstly. It is like to design a rectangle slot in the ground. Furthermore, we design a T-shaped microstrip-fed in patch and then combine each other by couple method. It can enable the proposed antenna have the bandwidth characteristic. The bandwidth of impedance can up to 51 percentages. In the next, we design the Two-element and Four-element T-shaped microstrip-fed printed rectangle slot antennas dividedly to achieve the goal of increasing bandwidth based on previous antenna structure. In the Two-element T-shaped microstrip-fed printed rectangle slot antenna, we try to design two sections for comparing different operation frequency at low frequency (790MHz~1.66GHz) and medium frequency(1.667GHz~ 2.957GHz). The bandwidth of impedance is 64%(1.68~ 2.96GHz) on the part of Two-element T-shaped microstrip-fed printed rectangle slot antenna, but the Four-element is 55.5%(1.63~ 2.74GHz) that we can find the Four-element bandwidth of impedance is not increasing. However, the maximum gain of Two-element is 5.58dBi and the Four-element is up to 6.90dBi. At last, in order to improve the problem of the bandwidth of impedance for Four-element T-shaped microstrip-fed printed rectangle slot antenna, the Eight-element slot antenna was proposed. After design and real practice, the Eight-element slot antenna’s bandwidth of impedance is exalt to 90.8%(1.51~ 3.97GHz) and the gain is exalt to 9.43dBi. For the previous results, we can find the proposed method of T-shaped microstrip-fed printed rectangle slot antenna is really have the characteristics of high-gain and bandwidth. Keywords: microstrip array antenna, wide-band, high-gain.
HUANG, ZONG-FANG, e 黃宗訪. "Coplanar waveguide fed slot array antennas". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/40128273237001752275.
Testo completoCooley, Michael Edward. "Analysis of infinite arrays of endfire slot antennas". 1992. https://scholarworks.umass.edu/dissertations/AAI9219420.
Testo completo