Bibliografias temáticas / Slot antenna arrays

Literatura científica selecionada sobre o tema "Slot antenna arrays"

Autor: Grafiati
Publicado: 25 de julho de 2024
Última modificação: 26 de julho de 2024

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Artigos de revistas sobre o assunto "Slot antenna arrays"

1

Trinidad Garcia, Elvis, Ruben Ortega e Saad Tabet. "Rectangular Slot Array Antenna". Applied Computational Electromagnetics Society 35, n.º 11 (3 de fevereiro de 2021): 1302–3. http://dx.doi.org/10.47037/2020.aces.j.351120.

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Slot antenna elements are quite popular for use in flat-panel arrays, due to their compactness and relatively large bandwidth. According to Babinet’s Principle, slots and dipoles are duals in performance. Therefore, a vertically placed slot is horizontally polarized and a horizontally placed slot is vertically polarized. A rectangular slot array lends itself to a broad range of applications, e.g., tactical and weather radar. Such arrays can be gimbaled to point their beam in any azimuth and elevation angle of interest. In this effort, a slot antenna element is designed in WIPL-D Pro to operate over the 7.5 - 8.5 GHz frequency range. The element is designed to resonate at 8 GHz. The slot element is used to generate a 6x12 slot array normal to the xy-plane. Separate Taylor tapers (nbar = 5) are applied to the 6-row and 12-column elements to provide 25 dB and 30 dB sidelobe level (SLL) suppression, respectively. The input impedance and pattern performance for a single slot, as well as the slot array’s radiation performance show excellent broadband performance.
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Potgieter, L., J. Joubert e J. W. Odendaal. "Design of center-fed printed planar slot arrays". International Journal of Microwave and Wireless Technologies 9, n.º 2 (9 de dezembro de 2015): 453–61. http://dx.doi.org/10.1017/s1759078715001701.

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A design approach for printed planar slot array antennas is presented. The antenna array consists of half-wavelength slot radiators positioned on a rectangular grid, and a slotline feed network. Three planar slot array antennas for use in IEEE 802.11a applications are designed, a 2 × 2, a 2 × 4, and a 4 × 2 array, all radiating above an electric conductor ground plane placed a quarter-wavelength below the printed slots. These slot arrays have higher aperture efficiencies and occupy less space than typical microstrip patch arrays. The measured impedance bandwidths of the designed unidirectional slot arrays were 19.8, 15.3, and 16.7%, respectively, with peak gains of 11.7, 13.9, and 14.4 dBi. Measured results show very good agreement with the simulated results, which serves as validation of the array design procedure and the accuracy of the simulated results.
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Chin, Kuo-Sheng, Chi-Sheng Wu, Chien-Lung Shen e Kun-Chuan Tsai. "Designs of Textile Antenna Arrays for Smart Clothing Applications". Autex Research Journal 18, n.º 3 (1 de setembro de 2018): 295–307. http://dx.doi.org/10.1515/aut-2018-0002.

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Abstract In this work, three designs of textile antennas, namely, a rectangular microstrip patch antenna, annular slot antenna, and planar inverted-F antenna (PIFA), operating in the 2.45 GHz WLAN band were developed for smart clothing applications. Conductive textile, a copper-plated polyester fabric, was used for fabricating antenna radiators and grounds. An insulating neoprene fabric with a thickness of 4 mm and a permittivity of 1.5 was used for preparing the substrates. The textile patch antenna achieved a maximum gain of 5.96 dBi and a bandwidth of 4.6%. The annual slot antenna showed a moderate gain and bandwidth of 2.9 dBi and 13.1%, respectively. The PIFA achieved the widest bandwidth of 31% but the smallest gain of 1.2 dBi. Furthermore, the performance deterioration of the proposed antennas under various bending conditions was analyzed to evaluate their suitability for wearable applications. Moreover, two 2 × 2 patch and slot antenna arrays were assembled to increase gain and bandwidth. The measured results proved that the developed antenna designs provide superior performance.
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Fallah, Mahmoud, e Mohammad Khalaj-Amirhosseini. "Meta-waveguide analysis and implementation for using as a slot array antenna". International Journal of Microwave and Wireless Technologies 12, n.º 2 (11 de setembro de 2019): 138–47. http://dx.doi.org/10.1017/s1759078719001132.

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AbstractThis paper presents a novel concept named meta-waveguide structures to design slot array antennas based on metasurface. The proposed method investigates the geometrical parameters of the embedded metasurface and their relations to build up the engineered electric and magnetic fields to introduce efficient slot array antennas. This approach eliminates the necessity of using the well-known offsets in typical slot arrays, which can be benefited from linear array theorem. This idea is realized by employing successive filed curvature along the propagation direction, utilizing periodic metasurfaces. Thereafter, a step-by-step algorithm is recommended to design an efficient slot array antenna. Finally, a prototype is fabricated and tested experimentally validating the theoretical calculations.
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Lee, Doojin. "Study of metasurface coated bowtie antenna to decouple closely coupled arrays". AIP Advances 12, n.º 11 (1 de novembro de 2022): 115108. http://dx.doi.org/10.1063/5.0107498.

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This paper presents the numerical studies of the bowtie antenna with and without metasurface in cross-coupled arrays. The single bowtie antennas coated by the metasurface are designed at the neighboring frequency of 3 GHz. The cloaked frequency of the cloaked bowtie antennas is controlled by components that consist of metasurface such as the dielectric constant of the supporting material, slot width, spacing of the slot, and the height of the material. The cloaked bowtie antenna has characteristics such as the minimum reflection from the antenna at the designed frequency and, at the same time the radar cross section has a low value at the cloaked frequency. This characteristic has been intensively explored with closely cross-coupled antennas in array configurations as 1D lateral arrangement and 2D arrangement for the sequential and simultaneous modes. It is numerically confirmed that the characteristics of the cloaked coupled arrays are kept the same as those of a standalone array, which is shown to have robust characteristics to the mutual coupling between strongly coupled elements.
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Jafargholi, Amir, Manouchehr Kamyab e Mehdi Veysi. "PMC-Based Waveguide-Fed Slot Array". ISRN Communications and Networking 2011 (21 de setembro de 2011): 1–5. http://dx.doi.org/10.5402/2011/941070.

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Perfect magnetic conductors (PMCs) can help in the enhancement of antenna impedance bandwidth using their capability of reflecting the incident waves without phase reversal. The purpose of this paper is to show the advantages of using a perfect magnetic conductor in antenna engineering. The goal is to use it in waveguide-fed slot array antennas, increasing both the antenna impedance and radiation bandwidths. To this aim, a PMC-based rectangular waveguide composed of longitudinal slots is convenient. The impedance of the proposed array structure is calculated analytically. To compare analytical results with the simulation results, PEC- and PMC-based waveguide-fed slot arrays are designed and simulated in a certain frequency band. The simulation results are in good agreement with the theoretical predictions.
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Mohammadi-Asl, Saeed, Javad Nourinia, Changiz Ghobadi e Maryam Majidzadeh. "Broadband circularly polarized slot antenna arrays using linked elliptical slots forC- andX-band applications". International Journal of Microwave and Wireless Technologies 10, n.º 3 (abril de 2018): 328–35. http://dx.doi.org/10.1017/s1759078717000812.

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Compact broadband circularly polarized elliptical slot antenna arrays (CPESAAs) are devised based on 2 × 2 and 4 × 4 circularly polarized (CP) elliptical slot antennas and a sequential phase feed network. To realize the circular polarization, eight rectangular stubs are embedded in the feed structure to excite two orthogonal E vectors in 2 × 2 CPESAA configuration. Moreover, by taking four rectangular slots out from each array element, return loss and axial-ratio bandwidths are noticeably increased. The investigated simple array element has a compact size of 20 × 20 × 1 mm3. As well, 2 × 2 CPESAA occupies a compact size of 55 × 60 × 1 mm3, which operates within the frequency band 4.18–9.35 GHz. Thus, 76.4% of S11< −10 dB and 51.4% of CP bandwidth (4.43–7.5 GHz) are covered. Moreover, proposed 4 × 4 CPESAA is printed on 110 × 110 × 1 mm3FR4 substrate and covers the frequency band of 1.15–12.98 GHz with CP at 2.95–8.82 GHz. Throughout the study, the design process of the proposed antenna arrays are presented and discussed in detail.
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Milijić, Marija, e Branka Jokanović. "Advanced high-gain slot antenna arrays for 5G and radar applications". Telfor Journal 13, n.º 1 (2021): 29–34. http://dx.doi.org/10.5937/telfor2101029m.

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This paper presents an advanced design of high-gain slot antenna array at K-band using slots as radiating elements serially fed by coplanar waveguide (CPW). The arrays consist of identical slots of rectangular shape positioned symmetrically relative to the CPW feeding line. Firstly, the linear arrays of 14 slots are examined considering mainly their bandwidth and radiation characteristics. In addition, two identical linear sub - arrays of 14 slots are investigated when they have separate feeding in the form of two generators for each sub - array. Last, a CPW T-junction is employed to feed the antenna consisting of 2 x 14 slots which resulted in a wide operating bandwidth and maximum gain of 21.0 dBi which proved to be 2.25 dB less gain than with independent feeding. In order to enhance the antenna gain, both arrays are terminated with open-circuited stubs, so that the energy remaining after the last array element is reflected from the stub and re-radiated through the slot arrays. The length of the stubs is optimized to provide that the reflected wave is in phase with the forward-traveling waves at all the slot locations. In that way, very little energy is wasted and consequently the antenna gain is increased. The feed simplicity and uniplanar configuration of the slot arrays, designed for the frequency range 24.25-27.5 GHz, makes them attractive for radar sensors and high capacity 5G technology applications.
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Mohd Aminudin Jamlos, Nurasma Husna Mohd Sabri, Mohd Faizal Jamlos, Wan Azani Mustafa, Syed Zulkarnain Syed Idrus, Mohamad Nur Khairul Hafizi Rohani, Khairul Najmy Abdul Rani e Mohd AL Hafiz Mohd Nawi. "5.8 GHz Circularly Polarized Rectangular Microstrip Antenna Arrays simulation for Point-to-Point Application". Journal of Advanced Research in Applied Sciences and Engineering Technology 28, n.º 3 (30 de novembro de 2022): 209–20. http://dx.doi.org/10.37934/araset.28.3.209220.

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In this paper, the design and simulation of rectangular microstrip antenna arrays for improving antenna gain is performed for point-to-point application. The proposed design is composed of four elements microstrip antenna with an array configuration operating at 5.8 GHz. Each element is constructed from four truncated arrays radiating elements and an inclined slot on each patch which capable to achieve circular polarized capability. The design of the 2x1 and 2x2 of rectangular microstrip array antenna was implemented from the designed of single rectangular patch antenna as the basic building element. The designed 2x1 and 2x2 array were fed by microstrip transmission line which applied a technique of quarter wave impedance matching. The antenna design was etched on Rogers RT 5880 substrate with 2.1 and 1.53 mm of dielectric constant and thickness respectively. All the designed structure were simulated in CST software. The main results of the designed antennas were compared in terms of gain, axial ratio and return loss. Based on the return loss simulation results, the designed antennas resonated exactly at the desired resonant frequency of 5.8 GHz which indicates good antenna designs. Compared to the single patch antenna having an antenna gain of 8.26 dB, the 2x1 and 2x2 arrays achieved a gain of 10.24 dB and 13.29 dB respectively. The results show that the designed rectangular microstrip antenna arrays have an improved gain performance over the single patch antenna.
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Lin, Jia-Hong, Wen-Hui Shen, Zhi-Dong Shi e Shun-Shi Zhong. "Circularly Polarized Dielectric Resonator Antenna Arrays with Fractal Cross-Slot-Coupled DRA Elements". International Journal of Antennas and Propagation 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/8160768.

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In the design of circularly polarized (CP) dielectric resonator antenna (DRA) arrays, the regular-shaped DRAs with simple feeding configurations are mostly used as array elements to make the design procedure more efficient. However, such array element DRA usually achieves only about 6% axial ratio (AR) bandwidth. In this paper, a CP DRA element coupled by a fractal cross-slot which can radiate efficiently and excite the rectangular DRA simultaneously is considered. By adjusting the dimensions of the fractal cross-slot properly, the resonances of the fractal cross-slot and the dielectric resonator can be merged to obtain a wider AR bandwidth. Based on the proposed fractal cross-slot-coupled CP DRA element, two different CP DRA arrays are designed: a wideband CP DRA array and a low-sidelobe-level (SLL) CP DRA array. The designed DRA arrays are fabricated and measured, and structures and performances of the arrays are presented and discussed.
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Mais fontes

Teses / dissertações sobre o assunto "Slot antenna arrays"

1

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.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
This 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.
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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.

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Series-fed printed slot antenna arrays excited by microstrip lines are low profile, easy to manufacture, low cost structures that found use in applications that doesn&rsquo
t 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.
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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.

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This 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.

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Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.

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The focus of this dissertation is on the development and circuit modeling of planar series-fed, linear- and circular-polarized microstrip aperture-coupled antennas and N-element arrays operating in C-band. These arrays were designed to be used as part of airborne or land-based frequency-hopped communication systems. One of the main objectives of this work was to maintain a constant beam angle over the frequency band of operation. In order to achieve constant beam pointing versus frequency, an anti-symmetric series-fed approach using lumped-element circuit models was developed. This series feed architecture also balances the power radiated by each element in the N-element arrays. The proposed series-fed approach was used in the development of four-element series-fed aperture-coupled arrays with 15% 10 dB impedance bandwidth centered at 5 GHz and a gain of 11.5 dB, to construct an omni-directional radiator. Omni-directional radiators with pattern frequency stability are desired in a multitude of applications; from defense in tactical communications, information gathering, and detection of signal of interest to being part of sensors in medical applications. A hexagonal assembly of six series-fed microstrip aperture-coupled four-element arrays was used to achieve the omni-directional radiation with 0.6 dB peak to peak difference across 360˚ broadside pattern and 0.6 dB gain variation at the specific azimuth angle across 15% impedance bandwidth. Given that each of these six arrays can be individually controlled, this configuration allows for individual pattern control and reconfiguration of the omni-directional pattern with increased gain at specific azimuth angles and the ability to form a directional pattern by employing a fewer number of arrays. Incorporating a beam-forming network or power distribution network is also possible. Wide 3 dB circular polarization (CP) bandwidth was achieved without external couplers and via only a single feed with a unique Z-slot aperture-coupled microstrip antenna. A single RHCP Z-slot aperture-coupled antenna has ∼10% CP and 10 dB impedance bandwidth. The series-fed network consisting of lumped elements, open-circuited stubs and transmission lines was subsequently developed to maintain more than 5% CP and 10% 10 dB impedance bandwidth in the series-fed four-element Z-slot aperture-coupled CP array that could also be used for-omni-directional radiation.
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Zhang, 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.

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Today, owners of small communicating device are interested in transmitting or receiving various multimedia data. By increasing the number of antennas at the transmitter and/or the receiver side of the wireless link, the diversity/Multiple-Input Multiple-Output (MIMO) techniques can increase wireless channel capacity without the need for additional power or spectrum in rich scattering environments. However, due to the limited space of small mobile devices, the correlation coefficients between MIMO antenna elements are very high and the total efficiencies of MIMO elements degrade severely. Furthermore, the human body causes high losses on electromagnetic wave. During the applications, the presence of users may result in the significant reduction of the antenna total efficiencies and highly affects the correlations of MIMO antenna systems. The aims of this thesis are to investigate and enhance the MIMO/diversity performance of multiple antenna systems in the free space and the presence of users. The background and theory of multiple antenna systems are introduced briefly first. Several figures of merits are provided and discussed to evaluate the multiple antenna systems. The decoupling techniques are investigated in the multiple antenna systems operating at the higher frequencies (above 1.7 GHz) and with high radiation efficiency. The single, dual and wide band isolation enhancements are realized through the half-wavelength decoupling slot, quarter-wavelength decoupling slot with T-shaped impedance transformer, tree-like parasitic element with multiple resonances, as well as the different polarizations and radiation patterns of multiple antennas. In the lower bands (lower than 960 MHz), due to the low radiation efficiency and strong chassis mode, the work mainly focused on how to directly reduce the correlations and enlarge the total efficiency. A new mode of mutual scattering mode is introduced. By increasing the Q factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations. With the inter-element distance larger than a certain distance, a higher Q factor also improved the total efficiency apart from the low correlation. A wideband LTE MIMO antenna with multiple resonances is proposed in mobile terminals. The high Q factors required for the low correlation and high efficiencies in mutual scattering mode is reduced with another mode of diagonal antenna-chassis mode. Hence, the bandwidth of wideband LTE MIMO antenna with multiple resonances mentioned above can be further enlarged while maintaining the good MIMO/diversity performance. The user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes. Utilizing these usefully information, an adaptive quad-element MAS has been proposed to reduce the user effects and the some geranial rules not limited to the designed MAS have also been given.

QC 20130121


EU Erasmus Mundus External Cooperation Window TANDEM
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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.

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Submitted by Sandro Camargo (sandro.camargo@unipampa.edu.br) on 2015-05-09T22:22:57Z No. of bitstreams: 1 126110018.pdf: 3775876 bytes, checksum: 4a58f20709bf7c39682924a84079246d (MD5)
Made 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.
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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.

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Lundin, 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.

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The interest in creating and detecting electromagnetic waves carryingangular momentum in such a way that they form helical wavefronts,so called "twisted light'', has increased in recent decades.One possible way of generating such waves at radio frequenciesis to use a circular phased antenna array, where a larger relativephasing of the antenna elements corresponds to more twist of thewavefront per wavelength.However, analytical computations of the radiated power, and in turn theamountof emitted angular momentum, displays a quite rapid decrease with increasedphasing. This decrease in intensity may cause problems when alarge range of twisting is desired; for instance, as a means to encodeand transmit information. We have found that the decrease in radiatedpower does not haveany explicit relation to the beam being endowed with angular momentum.Instead, the decrease in emitted power can be explained byelectromagnetic couplingof the antenna elements in the array and that energy conservationholds, because an equal decrease in power is seen at the input of the array.We also show that a similar discrepancy is seen between the incomingand the total diffracted power in Young's classic double slit experiment,which, having only two slits, cannot provide any twisted light.The source of that discrepancy should be of a different origin.Although an explanation in terms of surface plasmons was recently givenin the literature, that is only applicable to metal screens. A general explanation of the problem therefore remains to be found.
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9

Mcknight, 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.

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10

Grbic, 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.

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Livros sobre o assunto "Slot antenna arrays"

1

Q, Lee Richard, e United States. National Aeronautics and Space Administration., eds. Linearly tapered slot antenna impedance characteristics. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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2

Simons, Rainee. Space power amplification with active linearly tapered slot antenna array. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Q, Lee Richard, e United States. National Aeronautics and Space Administration., eds. Space power amplification with active linearly tapered slot antenna array. [Washington, DC: National Aeronautics and Space Administration, 1993.

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4

Simons, Rainee N. Spatial frequency multiplier with active linearly tapered slot antenna array. [Washington, DC: National Aeronautics and Space Administration, 1994.

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5

Langley, Jeremy David Scott. Wideband phased arrays using tapered slot antennas. Birmingham: University of Birmingham, 1996.

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6

Sangster, Alan J. Compact Slot Array Antennas for Wireless Communications. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01753-8.

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N, Simons Rainee, e United States. National Aeronautics and Space Administration., eds. Linearly tapered slot antenna circular array for mobile communications. [Washington, DC]: National Aeronautics and Space Administration, 1993.

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8

Grbic, Anthony. A novel leaky millimeter-wave linear slot antenna array. Ottawa: National Library of Canada, 2001.

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Simons, Rainee N. Characteristics of linearly tapered slot antenna with CPW feed on high resistivity silcon. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Simons, Rainee. Characteristics of linearly tapered slot antenna with CPW feed on high resistivity silcon. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Capítulos de livros sobre o assunto "Slot antenna arrays"

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Elliott, Robert S. "The Design of Waveguide-Fed Slot Arrays". In Antenna Handbook, 805–42. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-6459-1_12.

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2

Nesterenko, Mikhail V., Victor A. Katrich, Yuriy M. Penkin, Sergey L. Berdnik e Oleksandr M. Dumin. "Combined Vibrator-Slot Radiators in Antenna Arrays". In Lecture Notes in Electrical Engineering, 257–75. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60177-5_8.

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3

Raj, Valluri Dhana, A. M. Prasad e G. M. V. Prsad. "Investigation of Broadband Characteristics of Circularly Polarized Spidron Fractal Slot Antenna Arrays for Wireless Applications". In Advances in Intelligent Systems and Computing, 183–200. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2731-1_17.

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4

Hirokawa, Jiro, e Miao Zhang. "Waveguide Slot Array Antennas". In Handbook of Antenna Technologies, 1389–413. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-4560-44-3_51.

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Hirokawa, Jiro, e Miao Zhang. "Waveguide Slot Array Antennas". In Handbook of Antenna Technologies, 1–21. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-4560-75-7_51-1.

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Geng, Junping. "Principles of Omnidirectional CP Slot Array Antenna". In Omnidirectional Slots Antenna, 35–65. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9089-4_3.

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Geng, Junping. "Basic Theory of Omnidirectional Antenna and Slot Array". In Omnidirectional Slots Antenna, 19–34. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9089-4_2.

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Geng, Junping. "Principles of Omnidirectional Dual-CP Slot Array Antenna". In Omnidirectional Slots Antenna, 67–77. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9089-4_4.

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Ali, Sayyed Arif, Mohd Wajid e Muhammad Shah Alam. "SIW Slot Antenna Array for 5G Applications". In Lecture Notes in Electrical Engineering, 25–35. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0312-0_4.

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Schaubert, Daniel H. "Wide-Bandwidth Radiation from Arrays of Endfire Tapered Slot Antennas". In Ultra-Wideband, Short-Pulse Electromagnetics, 157–65. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2870-8_19.

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Trabalhos de conferências sobre o assunto "Slot antenna arrays"

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Matin, M. A. "Dual frequency microstrip antenna with V slot". In Wideband and Multi-Band Antennas and Arrays. IEE, 2005. http://dx.doi.org/10.1049/ic:20050309.

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Li, P. "Planar circular slot antenna for ultra-wideband applications". In Wideband and Multi-Band Antennas and Arrays. IEE, 2005. http://dx.doi.org/10.1049/ic:20050303.

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3

Kaloshin, V. A., e Le Doan Trinh. "Multi-Beam Trifocal Waveguide Slot Antenna Arrays". In 2020 Systems of Signals Generating and Processing in the Field of on Board Communications. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf48371.2020.9078579.

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Penkin, Yury, Victor Katrich, Mikhail Nesterenko e Sergey Berdnik. "Impedance Synthesis of Flat Slot Antenna Arrays". In 2020 IEEE Ukrainian Microwave Week (UkrMW). IEEE, 2020. http://dx.doi.org/10.1109/ukrmw49653.2020.9252645.

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Chan, K. C. L. "Slot-inserted semi-circular disc antenna for wideband communications". In Wideband and Multi-Band Antennas and Arrays. IEE, 2005. http://dx.doi.org/10.1049/ic:20050286.

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Dubrovka, F. F., S. Y. Martyniuk, D. O. Vasylenko e O. S. Postulga. "Ultrawideband tapered slot, waveguide and dipole antenna arrays". In 2017 XI International Conference on Antenna Theory and Techniques (ICATT). IEEE, 2017. http://dx.doi.org/10.1109/icatt.2017.7972578.

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Ma, Li, Muyang Li, Peng Chen, Hui Zhang e Xutao Yu. "Design of Low Sidelobe Waveguide Slot Antenna Arrays". In 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT). IEEE, 2020. http://dx.doi.org/10.1109/ucmmt49983.2020.9296005.

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Johansson, J. F., K. S. Yngvesson e E. L. Kollberg. "Model Experiments With Slot Antenna Arrays For Imaging". In 1985 International Technical Symposium/Europe, editado por Erik L. Kollberg. SPIE, 1986. http://dx.doi.org/10.1117/12.952330.

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Baca, Loretta J., e John G. McInerney. "A High-speed Microwave Antenna Suitable for Optoelectronic Integration". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fnn5.

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Broadband antenna arrays are essential for applications such as radar, frequency-agile microwave communication and electronic counter-measures. Optical feeding of the individual elements of such arrays is promising for beam steering, remote positioning of the antenna with respect to the signal source or receiver, and for high-frequency operation where the inter-element spacing becomes too small for individual waveguide feeds. In this paper we describe the design, fabrication and evaluation of a compact broadband antenna on semi-insulating GaAs or similar material, which lends itself readily to array formation, and which is readily integrable with high-speed electronic and optoelectronic components for optical feeding and phase-shifting. Our design methodology has used the effective index method commonly used in optical waveguide analysis, in place of the more conventional but cumbersome method of moments. This simplification is justified by the strong confinement of the fields within the high-permittivity substrate. A slot-line antenna with a four-section Chebyshev quarter-wave impedance transformer and Marchand balun was designed and fabricated on Duroid 6010, a material chosen for its similar dielectric properties to semi-insulating GaAs. By measuring the SWR using a microwave network analyzer and sweep oscillator, and by using the antenna in receiving mode on an anechoic test range, we have demonstrated successful performance with at least 10 dB directional gain in the designed range 16-18 GHz. Possible applications of single- and multiple-element antennas of this type in hybrid optical/microwave systems will be discussed.
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Sharawi, Mohammad S., e Muhammad Ikram. "Slot-based connected antenna arrays for 5G mobile terminals". In 2018 International Workshop on Antenna Technology (iWAT). IEEE, 2018. http://dx.doi.org/10.1109/iwat.2018.8379256.

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Relatórios de organizações sobre o assunto "Slot antenna arrays"

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Kisliuk, Moshe, Bernard Steinberg e William Whistler. Conformal Microstrip Slot Antenna and Antenna Array. Fort Belvoir, VA: Defense Technical Information Center, setembro de 1986. http://dx.doi.org/10.21236/ada174370.

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