Bibliografie tematiche / Multiband and wideband antenna

Letteratura scientifica selezionata sul tema "Multiband and wideband antenna"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "Multiband and wideband antenna":

Yadav, Dorik Narayan. "Study of Multiband DRA for Mobile communication". Himalayan Physics 5 (5 luglio 2015): 75–77. http://dx.doi.org/10.3126/hj.v5i0.12876.

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The explosive demand for mobile communication and information transfer using personal devices such as mobile phone or notebook computer has caused the need for major advancements of antenna design. With the development of 3G and 4G technologies multiband and wideband antennas operating at additional frequency band such as UMTS and LTE are required. In this chapter it is initially presented the fundamental parameters of antenna to be taken into account while designing an antenna and determining the operating frequency bands. Multiband antennas which are used especially in mobile unit are described. The techniques to make an antenna convenient for multiband operations are given. There different antennas such as monopoles, PIFA are examined with several examples in the literatures. In the last part, the types of wideband antennas (micros strip patch antenna, DRA of planer) used in mobile communication which are more appropriate for base station or access point applications are presented. The Himalayan Physics Vol. 5, No. 5, Nov. 2014 Page: 75-77

Gupta, Ankush, Hem Dutt Joshi e Rajesh Khanna. "An X-shaped fractal antenna with DGS for multiband applications". International Journal of Microwave and Wireless Technologies 9, n. 5 (9 settembre 2016): 1075–83. http://dx.doi.org/10.1017/s1759078716000994.

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In this paper, an X-shaped fractal antenna with defected ground structure (DGS) is presented for multiband and wideband applications. The X shape is used due to its simple design and DGS is utilized to achieve size reduction with multiband and wideband features in the frequency range of 1–7 GHz. The proposed structure is fabricated on FR4 substrate with 1.6 mm thickness. We have proposed two different antennas both are having X-shaped fractal patch with a slotted ground plane to have more impedance bandwidth and better return loss. Various parameters like scale factor, width of ground plane, number of slots with their dimensions and feed line length are optimized to have size reduction and for enhancing the performance of antenna. Reflection coefficient shows the multiband and wideband features of proposed antenna. One of the proposed antennas covers various applications like IEEE802.11y at 3.65 and 4.9 GHz, IEEE 802.11a at 5.4 GHz, 802.11P at 5.9 GHz. Other antenna covers applications like IEEE802.16 at 3.5 GHz; 5 cm band for amateur radio and satellite and future 5 G communication systems over 6 GHz. The antenna designing was done using CST software and simulation results were compared with experimental results (using E5071C network analyzer).

Raj, Tej, Ranjan Mishra, Pradeep Kumar e Ankush Kapoor. "Advances in MIMO Antenna Design for 5G: A Comprehensive Review". Sensors 23, n. 14 (12 luglio 2023): 6329. http://dx.doi.org/10.3390/s23146329.

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Multiple-input multiple-output (MIMO) technology has emerged as a highly promising solution for wireless communication, offering an opportunity to overcome the limitations of traffic capacity in high-speed broadband wireless network access. By utilizing multiple antennas at both the transmitting and receiving ends, the MIMO system enhances the efficiency and performance of wireless communication systems. This manuscript specifies a comprehensive review of MIMO antenna design approaches for fifth generation (5G) and beyond. With an introductory glimpse of cellular generation and the frequency spectrum for 5G, profound key enabling technologies for 5G mobile communication are presented. A detailed analysis of MIMO performance parameters in terms of envelope correlation coefficient (ECC), total active reflection coefficient (TARC), mean effective gain (MEG), and isolation is presented along with the advantages of MIMO technology over conventional SISO systems. MIMO is characterized and the performance is compared based on wideband/ultra-wideband, multiband/reconfigurable, circular polarized wideband/circular polarized ultra-wideband/circular polarized multiband, and reconfigurable categories. The design approaches of MIMO antennas for various 5G bands are discussed. It is subsequently enriched with the detailed studies of wideband (WB)/ultra-wideband (UWB), multiband, and circular polarized MIMO antennas with different design techniques. A good MIMO antenna system should be well decoupled among different ports to enhance its performance, and hence isolation among different ports is a crucial factor in designing high-performance MIMO antennas. A summary of design approaches with improved isolation is presented. The manuscript summarizes the various MIMO antenna design aspects for NR FR-1 (new radio frequency range) and NR FR-2, which will benefit researchers in the field of 5G and forthcoming cellular generations.

Idris, Izni Husna, Mohamad Rijal Hamid, Kamilia Kamardin, Mohamad Kamal A. Rahim e Huda A. Majid. "A multiband and wideband frequency reconfigurable slotted bowtie antenna". Indonesian Journal of Electrical Engineering and Computer Science 19, n. 3 (1 settembre 2020): 1399. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1399-1406.

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A multiband and wideband frequency reconfigurable antenna is presented. A wideband from 3.5 GHz to 9.0 GHz is achieved by introducing one stripline in the middle of a slotted bowtie antenna, whereas multiband is obtained by integrating an additional two slotted arms at the end of bowtie-shaped. As a result, the antenna operated at multiband mode (1.7 GHz and 2.6 GHz) and wideband mode (3.5 GHz to 9.0 GHz) simultaneously. The reconfigurability of the antenna is attained through switches. Five states are achieved with three pairs of switches configurations. All results are presented and discussed, including S11, current distribution, radiation pattern, and gain. The antenna is suitable to be used in multimode communication systems.

Abraham, Jacob, Kirthika Natarajan, Senthilkumar Andi, Jemin Vijayaselvan Mariyarose, Manjunathan Alagarsamy e Kannadhasan Suriyan. "Frequency reconfigurable microstrip patch antenna for multiband applications". International Journal of Reconfigurable and Embedded Systems (IJRES) 13, n. 2 (1 luglio 2024): 472. http://dx.doi.org/10.11591/ijres.v13.i2.pp472-482.

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Wireless communication technology is well-established, and several antennas have been developed and produced specifically for this purpose. However, antenna performance and communication system development need to be enhanced in order to adapt to the present era. The performance of the antenna is significantly influenced by its design. Thus, this work produced a novel wideband antenna design via the use of a frequency reconfigurable approach. In the recommended study, microstrip patch antennas (MPAs) were used in wideband applications to switch frequencies using shunt-series microelectromechanical systems (MEMS). The suggested antenna, which has two switches built into it, is tested in ON-ON, OFF-ON, and OFF-OFF switching scenarios. Radiation pattern, voltage standing wave ratio (VSWR), gain, bandwidth, and return loss are among the antenna performance metrics used to assess the suggested antenna's performance in each switching situation. The simulation findings suggest that the optimal antenna design for usage in wireless communication systems is one that works well with a shunt-series MEMS switch.

Haider, N., D. Caratelli e A. G. Yarovoy. "Recent Developments in Reconfigurable and Multiband Antenna Technology". International Journal of Antennas and Propagation 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/869170.

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A comparative analysis of various reconfigurable and multiband antenna concepts is presented. In order to satisfy the requirements for the advanced systems used in modern wireless and radar applications, different multiband and reconfigurable antennas have been proposed and investigated in the past years. In this paper, these design concepts have been classified into three basic approaches: tunable/switchable antenna integration with radio-frequency switching devices, wideband or multiband antenna integration with tunable filters, and array architectures with the same aperture utilized for different operational modes. Examples of each design approach are discussed along with their inherent benefits and challenges.

Dash, Rajib Kumar, Puspendu Bikash Saha, Dibyendu Ghoshal e Gopinath Palai. "Design of triangular shaped slotted patch antennas for both wideband and multiband applications". International Journal of Applied Electromagnetics and Mechanics 68, n. 3 (14 marzo 2022): 275–94. http://dx.doi.org/10.3233/jae-210098.

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In this article two fractal geometry-based slotted patch antennas are designed to achieve wideband response with multiband characteristics and reduced cross polarized radiation in both E- and H-plane for all the resonating bands. The proposed antennas are fed with microstrip line feeding formed on a FR4 substrate of size 0.25𝜆0 × 0.25𝜆0 × 0.02𝜆0 mm3 and loaded with a partial ground plane at the bottom of the substrate. HFSS is used to design and simulate both the antennas. Wideband behavior and impedance matching of Antenna-1 are improved by optimizing the factor of iteration and length of the ground plane. Due to addition of 3 identical split ring resonators (SRR) with the antenna geometry leads to achieve multiband response in Antenna-2. The dimensions of the SRR connectors and feedline have been optimized through parametric analysis to match the impedance properly at all the three resonating bands. It has been found that simulated and measurement results of both the antennas are properly matched.

Kumar, Somesh, e Ms Monika. "Study of Effect of Variations in slot dimensions on Fractal Patch antenna Performance". INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 5, n. 1 (23 giugno 2013): 41–48. http://dx.doi.org/10.24297/ijct.v5i1.4385.

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An antenna is a device that is made to efficiently radiate and receive radiated Electromagnetic waves. Microstrip antennas are attractive due to their light weight, conformability and low cost. These antennas can be integrated with printed strip-line feed networks and active devices. This is a relatively new area of antenna engineering. For reducing the size of antenna, fractal geometries have been introduced in the design of patch antenna. Fractal antennas also called as space filling curves are very compact, multiband or wideband, and have useful applications in cellular telephone and microwave communications. In our research work, we have used IE3D software for designing the antenna. We study the effect of variations of slot dimensions on antenna performance so as to obtain good results. In this research work, four different fractal patch antennas are designed. The rectangular base geometry is same for the all four antennas but the elliptical slot dimensions differ. In simulation, S parameters of all four antennas are analyzed. From the S parameter displays, comparison of all four antennas is done on the basis of three parameters that are: Lowest frequency, Multiband and S11 values. The simulation results shows that as the elliptical slot dimension decreases on rectangular patch antenna, the performance of fractal patch antenna improves on the basis of three factors that are lowest frequency, multiband and s11 values.

Nag, Vibha Raj, e Mrinal Sarvagya. "Review Paper on Different Dual Band Printed Slot Antenna for 5G Wireless Communication". International Journal of Informatics and Communication Technology (IJ-ICT) 7, n. 3 (1 dicembre 2018): 105. http://dx.doi.org/10.11591/ijict.v7i3.pp105-110.

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<span>With advancement in communication technology over the past decade, there is an increasing demand for miniaturization, cost effective, multiband and wideband antennas. Dual band printed slot antenna designs can support in meeting these requirements. Various techniques, different shapes and geometries have been introduced for size reduction of dual band printed slot antennas. This paper is on various techniques for designing dual band printed slot antenna exhibits details of different geometries developed to get multiband behavior of printed slot antenna. In this paper geometry of the antenna and variousparameters such as return loss plot, gain plot, radiation pattern plot and VSWR plot are discussed. In this paper the review on various techniques of compactness by geometry on different shapes of printed slot antenna for 5G next generation wireless (NGW) mobile application are presented</span>

Wang, Y., M. Reit e W. Mathis. "Entwurfskonzept einer Car2Car-Multiband-Dachantenne". Advances in Radio Science 10 (18 settembre 2012): 63–68. http://dx.doi.org/10.5194/ars-10-63-2012.

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Abstract. Due to the vastly increasing use of wireless services in the car, such as WiFi, Car2Car and LTE, the requirements on bandwidth and radiation pattern of the roof antenna systems become more challenging. In this work, a design concept for multi-band roof antenna systems is presented. We aim to get a higher bandwidth and an almost circular radiation pattern on the horizontal plane. Moreover, the antenna length is considered in order to fulfill the requirements set by construction ECE-regulations (ECE, 2010). The applicability of the design concept is not limited to multi-band roof antennas, it can also be used for a general wideband antenna design. For illustration of this concept, a multi-band roof antenna with a bandwidth of 780 MHz to 5.9 GHz and a near circular radiation pattern with an average gain of G = 3 dBi (at 5.9 GHz) on the horizontal plane is designed. The simulation and measurement results are presented.

Più fonti

Tesi sul tema "Multiband and wideband antenna":

Mello, Rafael Gonçalves Licursi de. "Active and passive metasurfaces : methodology for the design of a low profile, beam-steerable, multiband, and wideband antenna". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT025.

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Les métasurfaces sont des matériaux artificiels qui peuvent être combinés avec des éléments micro-ondes traditionnels dans des solutions révolutionnaires. Les recherches sur l'utilisation des métasurfaces dans les rôles de réflecteur et/ou de superstrat d'antenne se sont considérablement intensifiées à partir du début des années 2020, en raison de leurs fonctionnalités innovantes alignées avec les dernières tendances en Télécommunications. Dans cette thèse, des méthodologies pour l'utilisation de métasurfaces passives et actives dans la conception d'antennes sont présentées. Une première méthodologie qui exploite à la fois les comportements proches du conducteur électrique parfait (CEP) et du conducteur magnétique parfait (CMP) d'un conducteur magnétique artificiel (CMA) bi-bande est utilisée pour concevoir une antenne directive multibande à faible encombrement. Cette méthodologie est validée avec un prototype pour les normes européennes 4G/5G et Wi-Fi 2.4/5/6E, fonctionnant dans les bandes suivantes : 2.40–2.70 GHz, 3.40–3.80 GHz, 5.17–5.83 GHz, and 5.93–6.45 GHz. De plus, une méthodologie pour gérer le mécanisme Fabry-Pérot dans une antenne composée d'une bow-tie avec les bords arrondis rainurés, d'un AMC passif bi-bande et d'une métasurface Huygens active multibande est présentée. Cette méthodologie est validée avec la conception d'une antenne multibande, directive, à faible encombrement qui effectue un dépointage du faisceau indépendant dans une des bandes de fréquences de fonctionnement. Grâce au contrôle des tensions de polarisation sur quatre colonnes de varactors dans la métasurface reconfigurable et multibande de Huygens, le faisceau peut être dynamiquement dépointé à ±51°, de manière continue, dans une gamme de fréquences comprise dans la gamme de fréquences 5G européenne (de 3.50 to 3.65 GHz). En même temps, les diagrammes de rayonnement concernant la 4G et le Wi-Fi 2.4/5/6E restent pratiquement inchangés
Metasurfaces are artificial engineered materials that can be combined with traditional microwave components in ground-breaking solutions. The research on the use of metasurfaces in the roles of antenna reflector and/or superstrate considerably increased mainly from the beginning of the 2020s, because of their innovative functionalities in line with the ultimate Telecommunication trends. In this thesis, methodologies for the use of passive and active metasurfaces in the design of antennas are presented. A first methodology which exploits both the near-perfect electric conductor (PEC) and near-perfect magnetic conductor (PMC) behaviors of a dual-band artificial magnetic conductor (AMC) is used to design a low-profile, multiband, directive antenna. This methodology is validated with a prototype suitable for the European standards of 4G/5G and Wi-Fi 2.4/5/6E, operating within the following bands: 2.40–2.70 GHz, 3.40–3.80 GHz, 5.17–5.83 GHz, and 5.93–6.45 GHz. Additionally, a methodology to handle the Fabry-Pérot mechanism in an antenna composed of a grooved rounded-edge bow-tie, a passive dual-band AMC, and an active multiband Huygens metasurface is presented. This methodology is validated with the design of a multiband, directive, low-profile, antenna that performs an independent beam-steering in only one of the operating frequency bands. Through the controlling of the bias voltages over four columns of varactors in the reconfigurable, multiband Huygens metasurface, the beam may be dynamically steered in ±51°, in a continuous manner, in a frequency range lying inside the European 5G frequency range (from 3.50 to 3.65 GHz. All at once, the radiation patterns concerning the 4G and Wi-Fi 2.4/5/6E keep practically unaffected

Yousuf, Muhammad Amir. "Parametric Modeling of small terminals and Multiband or Ultra wideband Antennas". Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/63/48/66/PDF/Parametric_Modeling_of_UWB_antennas.pdf.

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Depuis le lancement systèmes des communications d'ultra large bande (ULB) en courtes distances les facteurs comme la miniaturisation d'appareil et haut débit créer des grands défis pour les concepteurs d'antennes. Une façon de faire le travail de conception facile est du modéliser statistiquement la variabilité de comportement de rayonnement de l'antenne en fonction de sa géométrie. Tel effort est également utile pour la meilleure utilisation du canal de communication si on combine le modèle d'antenne avec ça. Cette thèse est une tentative vers la modélisation statistique des antennes ULB. Le sujet est confronté à deux défis majeurs, la création de la population statistiques considérable d'une classe(s) d'antenne et la modélisation du diagramme de rayonnement de l'antenne qui est composé de grand nombre de paramètres complexes. Dans cette thèse, nous essayons de répondre le premier en proposant une approche de conception générique pour les antennes planaires ULB et le second en présentant l'utilisation de technique l'ultra-compressé de modélisation paramétrique. L'approche de conception générique est basé sur des formes trapézoïdales et offre une grande flexibilité et polyvalence dans la conception des antennes ULB diverses. Cette approche montre une facilité importante dans l'optimisation d'antennes (également pour la création de la population), car elle réduit le nombre de paramètres qui contrôle la géométrie de l'antenne, sans compromettre le degré de liberté. Ultra-compressé modélisation paramétrique est basée sur deux méthodes de synthèse d'antenne, la méthode d'expansion singularité (SEM) et sphériques méthode d'expansion de mode (SMEM) qui permettent de réduire le nombre de paramètres complexes requis pour le diagramme de rayonnement de 99,9%, permettant à l'effort de modélisation possibles. Un modèle statistique de l'antenne biconique basé sur cette technique a été présenté
Since the inception of short range Ultra Wideband (UWB) communication systems the factors like device miniaturization and high speed data rate create big challenges for antenna designers. One way to make the design job easy is to statistically model the variabilities of antenna radiation behavior as a function of its geometry. Such an effort is also useful for the better usage of the communication channel by combining the antenna model with it. This thesis is an attempt towards statistical modeling of UWB antennas. The subject faces two main challenges, the creation of sizeable statistical population of the class of antenna design(s) and modeling of antenna's radiation pattern which is composed of huge number of complex parameters. In this thesis we try to answer the former by proposing a generic design approach for UWB planar antennas and the latter by presenting the use of ultra-compressed parametric modeling technique. The generic design approach is based on trapezoidal shapes and offers great flexibility and versatility in designing various UWB antennas. This approach shows a significant ease in antenna optimization (also for population creation) as it reduces the no. Of parameters that controls the antenna geometry without compromising the degree of freedom. Ultra-compressed parametric modeling is based on two antenna synthesis methods, singularity expansion method (SEM) and Spherical mode expansion method (SMEM) that reduce the required no. Of complex parameters for the radiation pattern by 99. 9%, making the modeling effort possible. A statistical model of biconical antenna based on ultra-compressed modeling technique has been presented

Benomar, Ahmed. "Etude des Antennes à Résonateurs Diélectriques. : Application aux Réseaux de Télécommunications". Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0025/document.

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Un développement technologique rapide dans le domaine de télécommunication, qu'il s'agisse de la téléphonie mobile, des réseaux sans fils, de la télévision par satellites, ou des applications radar (civiles ou militaires)...etc. est observé. Cet essor considérable a engendré d'énormes besoins et entraîne une évolution technologique majeure au niveau des antennes. Ces dernières doivent faire face aux différentes exigences, à savoir l'augmentation du gain, l'élargissement de la bande passante… et aux différents problèmes existant, à savoir le coût, l’encombrement…etc. Notre objectif est donc de concevoir des topologies d’antennes simples, à faible encombrement et à gain relativement élevé avec un fonctionnement multibande et/ou ultra large bande. Pour cela nous nous sommes orientés vers des antennes à résonateur diélectrique (ARD) dans les bandes UHF et SHF. Récemment, elles ont fait l’objet de plusieurs recherches et ont acquis un grand intérêt du monde académique et industriel. Les ARDs, par leurs simples et diverses géométries, peuvent être alimentées par différentes usuelles techniques. En outre, leurs tailles peuvent être plus petites que leurs homologues à savoir les antennes imprimées. Une première partie de ce travail s’est concentré sur l’étude des ARDs de forme cylindrique, puis une validation de l’outil de simulation par comparaison avec la mesure. En vue d’une utilisation multistandards, d’un élargissement des bandes de fonctionnement ou d’une modification de la fréquence, une seconde partie a été consacrée à l’étude de nouvelles topologies de résonateurs basées sur un empilement vertical et radial de deux cylindres, une topologie en multicouche et en anneau. Les résultats obtenus trouvent leurs applications dans le GSM900-DSC1800, UMTS, WIFI…
A fast technological development in the telecommunications domain, as mobile telephony, wireless networks, TV over Satellite, Radar Applications (civil or military)…etc, is observed. This considerable growth has led to enormous needs and caused a major technological evolution in antennas. These have to face different needs such as gain improvement, bandwidth enlargement, and different existing problems, such as cost and overcrowding…etc. Though, our goal is to design antenna topologies that are simple, having Low overcrowding and relatively with high gain operating in multiband and/or ultra large. To achieve this we headed to Dielectric Resonator Antennas (DRA) in UHF and SHF bands. Recently they have been the subject of several studies and have gained great interest from both academic and industrial sectors. Due to their diverse and simple geometries, they can be fed with different usual techniques. Furthermore, they can be smaller than patch antennas. The first part of this work has focused on the study of cylindrical DRAs, and then a validation of the simulating tool has been done after comparison with measurement results. For a multi-standard utilization, enlargement antennas’ operating bands, to have bi-band behaviour, get a modification of the resonant frequency and also a reduction of the overcrowding, the second part is dedicated to the study of new resonator topologies based on a vertical and radial stack of two cylinders, and then a multilayer and ring topologies. The obtained results found their applications in GSM900-DCS1800-UMTS-WiFi…

Muscat, Adrian. "The design of planar low gain, wideband and multiband antennas employing optimisation techniques". Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271716.

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Saleem, Rashid. "Towards an end-to-end multiband OFDM system analysis". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/towards-an-endtoend-multiband-ofdm-system-analysis(e711f32f-1ac6-4b48-8f4e-58309c0482d3).html.

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Ultra Wideband (UWB) communication has recently drawn considerable attention from academia and industry. This is mainly owing to the ultra high speeds and cognitive features it could offer. The employability of UWB in numerous areas including but not limited to Wireless Personal Area Networks, WPAN's, Body Area Networks, BAN's, radar and medical imaging etc. has opened several avenues of research and development. However, still there is a disagreement on the standardization of UWB. Two contesting radios for UWB are Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) and DS-UWB (Direct Sequence Ultra Wideband). As nearly all of the reported research on UWB hasbeen about a very narrow/specific area of the communication system, this thesis looks at the end-to-end performance of an MB-OFDM approach. The overall aim of this project has been to first focus on three different aspects i.e. interference, antenna and propagation aspects of an MB-OFDM system individually and then present a holistic or an end-to-end system analysis finally. In the first phase of the project the author investigated the performance of MB-OFDM system under the effect of his proposed generic or technology non-specific interference. Avoiding the conventional Gaussian approximation, the author has employed an advanced stochastic method. A total of two approaches have been presented in this phase of the project. The first approach is an indirect one which involves the Moment Generating Functions (MGF's) of the Signal-to-Interference-plus-Noise-Ratio (SINR) and the Probability Density Function (pdf) of the SINR to calculate the Average Probabilities of Error of an MB-OFDM system under the influence of proposed generic interference. This approach assumed a specific two-dimensional Poisson spatial/geometric placement of interferers around the victim MB-OFDM receiver. The second approach is a direct approach and extends the first approach by employing a wider class of generic interference. In the second phase of the work the author designed, simulated, prototyped and tested novel compact monopole planar antennas for UWB application. In this phase of the research, compact antennas for the UWB application are presented. These designs employ low-loss Rogers duroid substrates and are fed by Copla-nar Waveguides. The antennas have a proposed feed-line to the main radiating element transition region. This transition region is formed by a special step-generating function-set called the "Inverse Parabolic Step Sequence" or IPSS. These IPSS-based antennas are simulated, prototyped and then tested in the ane-choic chamber. An empirical approach, aimed to further miniaturize IPSS-based antennas, was also derived in this phase of the project. The empirical approach has been applied to derive the design of a further miniaturized antenna. More-over, an electrical miniaturization limit has been concluded for the IPSS-based antennas. The third phase of the project has investigated the effect of the indoor furnishing on the distribution of the elevation Angle-of-Arrival (AOA) of the rays at the receiver. Previously, constant distributions for the AOA of the rays in the elevation direction had been reported. This phase of the research has proposed that the AOA distribution is not fixed. It is established by the author that the indoor elevation AOA distributions depend on the discrete levels of furnishing. A joint time-angle-furnishing channel model is presented in this research phase. In addition, this phase of the thesis proposes two vectorial or any direction AOA distributions for the UWB indoor environments. Finally, the last phase of this thesis is presented. As stated earlier, the overall aim of the project has been to look at three individual aspects of an MB-OFDM system, initially, and then look at the holistic system, finally. Therefore, this final phase of the research presents an end-to-end MB-OFDM system analysis. The interference analysis of the first phase of the project is revisited to re-calculate the probability of bit error with realistic/measured path loss exponents which have been reported in the existing literature. In this method, Gaussian Quadrature Rule based approximations are computed for the average probability of bit error. Last but not the least, an end-to-end or comprehensive system equation/impulse response is presented. The proposed system equation covers more aspects of an indoor UWB system than reported in the existing literature.

Yurduseven, Okan. "Integration of microwave antennas with solar PV for multiband and wideband mobile, WLAN and WiMAX applications". Thesis, Northumbria University, 2014. http://nrl.northumbria.ac.uk/17466/.

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The primary goal of this research is to investigate the existing photovoltaic antenna integration techniques and develop a new solar antenna integration topology in order to address the drawbacks of these techniques. With the increasing demands for low-profile antennas and a growing move towards the microgeneration of electricity, primarily by photovoltaics, photovoltaic antennas are of increasing importance with a growing amount of research in this area being developed. At present there are a number of designs for photovoltaic antennas which could be divided into two distinct categories. The first type is the use of solar cells as an RF ground plane, whilst the second type involves the use of solar cells as an RF radiating element. Both techniques bring significant challenges if they are to be widely adopted. Considering the first technique, using a solar cell as an RF ground plane introduces an optical shading problem, which significantly reduces the solar efficiency of the solar antennas using this integration topology. To this end, meshing the RF radiating element is investigated in this thesis to achieve optical transparency at the expense of increasing the cost and complexity of the fabrication process of photovoltaic antennas. Conversely, using a solar cell as an RF radiating element limits the ability to modify the resonance response using traditional RF bandwidth enhancement techniques due to the fact that solar cells need to have a homogeneous structure to achieve optimum solar performance. In order to address these challenges, a third solar antenna integration topology is proposed in this thesis. This method is based upon the use of solar cells as an RF stacked parasitic patch element suspended above the conventional RF radiating element of the integrated antennas. This integration topology enables the integrated solar cells to achieve an optimum solar efficiency due to their suspended position eliminating the shading problem. It also enables the RF radiating element to be modified to excite multiple TMmn propagation modes to achieve enhanced resonance response for multiband and wideband applications. This new topology has been further developed and applied to design a dual-polarised photovoltaic antenna for polarisation diverse communication systems, which has been extended to produce a photovoltaic array antenna for beam steering applications. This thesis addresses a major knowledge gap in the field of photovoltaic antennas. As a result of this, greater understanding of the design procedures of photovoltaic antennas and associated trade-offs from such designs is developed. Using this knowledge, novel designs that overcome the associated problems of current photovoltaic antennas are presented.

Garrido, Lopez David. "Low-Profile Multiband and Flush-Mountable Wideband Antennas for HF/VHF and K/Ka Band Applications". Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245047.

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Abstract (sommario):

This thesis introduces several novel antenna systems with extended performance capabilities achieved by either enabling multiple operation bands or by widening the bandwidth. Proposed theoretical concepts are successfully tested through simulations and experiments with excellent agreement are demonstrated. The designs developed in this thesis research are low-profile or flush mountable, enabling simple platform integration.

In the HF/VHF bands, the development of a novel low-profile multiband antenna for vehicular applications is presented. Specifically, an inverted-F antenna is used as a driven element, to operate at the lowest frequency of 27 MHz, whereas two parasitic elements are built as inverted-L monopoles to enable resonances at 49 and 53 MHz. To eliminate the need for an external matching network, an offset feeding technique is used. When the antenna is mounted on a vehicle and bent to follow its profile, a very low-profile is achieved (lambda/44) while good impedance and far-field performance are maintained across all three bands. The developed antenna system is not only electrically smallest among others found in the literature, but it is easily modified for other band selections and tuning of each band can be readily achieved.

Vehicular antennas are often used for high power applications, which may cause exposure of nearby individuals to possibly dangerous electromagnetic fields. To assess this hazard, the RF exposure of a vehicle's crew is discussed and an original and fast modeling approach for prediction thereof is demonstrated. The modeling approach is based on eigenmode analysis for acquiring a range of frequencies where the shielding effectiveness of a vehicle cabin is expected to be lower than average. This approach is typically much faster and requires less computational resources as compared to classical full-wave analyses. This analysis also shows that the position of an antenna system is critical and must be considered when high-power RF emissions are planned.

Following the same trend of antenna system size reduction with extension of capabilities in a congested spectral environment, the millimeter wave spectrum is explored next. Specifically, antenna systems for wideband amplitude only (AO) direction finding (DF) are thoroughly considered. Theory and design considerations are developed to fill gaps in open literature. Typical sources of errors are theoretically analyzed, and a discussion on limitations and advantages of different AO DF architectures is given.

Practical millimeter wave realizations of AO DF antenna front-ends in the K/Ka/Q bands (18-45 GHz) are developed using two different architectures: a passive phased-array and a squinted antenna system. For the former, a tightly coupled two-element tapered slot antenna (TSA) array with a stacked arrangement is developed. A novel enclosure of the array inside an absorbing cavity is proposed and improved system performance with flush mounted configuration is demonstrated. The squinted antenna system avoids the use of a beamformer, therefore reducing insertion loss and amplitude/phase imbalances to reduce DF errors. For design robustness, the same TSA element used in the phased-array configuration is used. A novel tapered cavity is also developed to stabilize H-plane radiation patterns and suppress sidelobes. It is seen that the squinted antenna AO DF front-end has better performance than the phased-array antenna system at the expense of larger size.

A, Rahim Mohamad Kamal. "Wideband active antenna". Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404129.

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Adaniya, Hana L. "Wideband active antenna cancellation". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/47896.

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Abstract (sommario):

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.
Includes bibliographical references (leaf 91).
There exists a simultaneous transmit and receive antenna system where the transmitted signal is creating wideband interference of the receiver. To resolve this interference problem, the isolation between the transmit antenna and the receive antenna must be increased. This thesis analyzes and discusses various strategies for antenna isolation and demonstrates the feasibility of an adaptive filtering approach on active signal cancellation. The final system design demonstrates that, with a broadband interference source in close proximity to a receiver, it is possible to provide 30 dB of isolation by using active cancellation.
by Hana L. Adaniya.
M.Eng.

Plaivech, Prachaya. "Wideband Antenna Over Ground Plane". Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515450.

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Più fonti

Libri sul tema "Multiband and wideband antenna":

Matin, Mohammad Abdul, a cura di. Wideband, Multiband, and Smart Antenna Systems. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74311-6.

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Matin, Mohammad A. Wideband, multiband, and smart reconfigurable antennas for modern wireless communications. Hershey, PA: Information Science Reference, 2015.

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Siriwongpairat, W. Pam. Ultra-wideband communications systems: Multiband OFDM approach. Hoboken, N.J: John Wiley, 2007.

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Yarman, Binboga Siddik. Design of Ultra Wideband Antenna Matching Networks. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8418-8.

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Adamiak, David V. Transient field visualization for ultra--wideband antenna design. Monterey, Calif: Naval Postgraduate School, 1999.

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F, Wilson Perry, e United States. National Telecommunications and Information Administration, a cura di. Advanced antenna test bed characterization for wideband wireless communications. [Boulder, Colo.]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1999.

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Institution of Electrical Engineers. Professional Network for Antennas and Propagation. Wideband and multi-band antennas and arrays. London: Institution of Electrical Engineers, 2005.

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Liu, Wei. Wideband beamforming: Concepts and techniques. Chichester, West Sussex, U.K: Wiley, 2010.

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Siddik, Yarman Binboga, a cura di. Design of ultra wideband antenna matching networks: Via simplified real frequency technique. [New York]: Springer, 2008.

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Ghavami, M. Ultra-wideband signals and systems in communication engineering. Chichester: John Wiley & Sons, 2004.

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Più fonti

Capitoli di libri sul tema "Multiband and wideband antenna":

Wong, Kin-Lu. "Multiband and Wideband Patch Antennas". In Novel Technologies for Microwave and Millimeter — Wave Applications, 329–46. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4757-4156-8_15.

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Singh, Sweta, Brijesh Mishra, Karunesh Shrivastva, Aditya Kumar Singh e Rajeev Singh. "Multiband and Wideband MIMO Antenna for X and Ku Band Applications". In Lecture Notes in Electrical Engineering, 557–66. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2818-4_59.

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Matin, Mohammad Abdul. "Advances in Wideband, Multiband, and Smart Antenna Systems for Wireless Communication". In Signals and Communication Technology, 1–4. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74311-6_1.

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Arun, Goswami Siddhant, Deepak C. Karia e Bhushan Dhengale. "Multiband and Wideband Antenna for Wi-Fi, WLAN, X-Band and Space Research Applications". In Proceedings of the International Conference on Recent Cognizance in Wireless Communication & Image Processing, 543–57. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2638-3_61.

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Tiwari, Devesh, Mohd Gulman Siddiqui, A. K. Saroj, J. A. Ansari, Neelesh Agrawal e Mukesh Kumar. "Analysis of Modified Swastika Shaped Slotted (MSSS) Microstrip Antenna for Multiband and Ultra-wideband Applications". In Lecture Notes in Electrical Engineering, 189–98. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9775-3_19.

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Okon, Ernest E. "Antenna Arrays". In Ultra-Wideband, 49–66. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470056843.ch4.

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Dohler, Mischa. "Basic Antenna Elements". In Ultra-Wideband, 31–47. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470056843.ch3.

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Liu, Junsheng, Wasim Q. Malik, David J. Edwards e Mohammad Ghavami. "Antenna Diversity Techniques". In Ultra-Wideband, 89–104. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470056843.ch6.

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Abbas, Syed Muzahir, Ilyas Saleem, Abida Parveen, Hijab Zahra e Shahid Ahmed Khan. "Chebyshev Multiband Patch Antenna". In Communications in Computer and Information Science, 10–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28962-0_2.

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Chen, Zhi Ning. "Antenna Issues". In Ultra Wideband Wireless Communication, 131–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/9780470042397.ch6.

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Atti di convegni sul tema "Multiband and wideband antenna":

Das, Hangsa Raj, Rajesh Dey e Sumanta Bhattacharya. "A REVIEW PAPER ON DESIGN FOR MICROSTRIP PATCH ANTENNA". In Topics in Intelligent Computing and Industry Design. Volkson Press, 2021. http://dx.doi.org/10.26480/etit.02.2020.166.168.

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Abstract (sommario):

Microstrip patch antenna is mostly used in modern communication devices over conventional antennas mainly because of their size. In this review paper a survey is conducted on commonly used techniques and design used in microstrip antenna papers which has been used by authors for designing of an efficient, low profile, small, compatible, affordable microstrip antenna, mainly used to designed reconfigurable, multiband and wideband antennas, after that a initiator patch design is given with dimensions on which technique will be applied for the analysis of different parameter of antenna.

Burr, A. G. "Multiband MIMO antenna arrays". In Wideband and Multi-Band Antennas and Arrays. IEE, 2005. http://dx.doi.org/10.1049/ic:20050301.

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Li, Xuyang, Malyhe Jalilvand, Jijing Yan, Lukasz Zwirello e Thomas Zwick. "A multiband slotted Bowtie antenna for stroke detection". In 2012 IEEE International Conference on Ultra-Wideband (ICUWB2012). IEEE, 2012. http://dx.doi.org/10.1109/icuwb.2012.6340477.

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Yahya, Muhammad Sani, Shipun Anuar Bin Hamzah, Khairun Nidzam Ramli, Fauziahanim Che Seman, Maisarah Abu, Shahilah Nordin, Nik Noordini Nik Abd Malik e Mohammad Sukri Mustapa. "Multiband and wideband characteristics of grid array antenna". In THE 5TH INTERNATIONAL CONFERENCE ON BIOSCIENCE AND BIOTECHNOLOGY. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0161930.

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Matekovits, Ladislau, e Aldo De Sabata. "Novel multiband wideband filter relying on metamaterial technology". In 2011 International Workshop on Antenna Technology (iWAT). IEEE, 2011. http://dx.doi.org/10.1109/iwat.2011.5752369.

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Hess, D. W., C. A. E. Rizzo e J. Fordham. "Measurement of antenna performance for active array antennas with spherical near-field scanning". In IET Seminar on Wideband, Multiband Antennas and Arrays for Defence or Civil Applications. IEE, 2008. http://dx.doi.org/10.1049/ic:20080089.

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Haridas, N., T. Arslan e A. T. Erdogan. "Multiband antenna for space based reconfigurable satellite sensor node". In IET Seminar on Wideband, Multiband Antennas and Arrays for Defence or Civil Applications. IEE, 2008. http://dx.doi.org/10.1049/ic:20080097.

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Barroso, Raul H., Diogenes Marcano e Miguel A. Diaz. "Modified multiband Parany antenna adapted to the 3.1–10.6 GHz band". In 2009 IEEE International Conference on Ultra-Wideband. IEEE, 2009. http://dx.doi.org/10.1109/icuwb.2009.5288694.

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Lee, H. J., K. L. Ford e R. J. Langley. "Dual band tunable antenna and EBG". In IET Seminar on Wideband, Multiband Antennas and Arrays for Defence or Civil Applications. IEE, 2008. http://dx.doi.org/10.1049/ic:20080093.

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Yamini, A. H., e M. Soleimani. "Multiband behavior of wideband Sierpinski fractal bow-tie antenna". In 2005 European Microwave Conference. IEEE, 2005. http://dx.doi.org/10.1109/eumc.2005.1610336.

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Rapporti di organizzazioni sul tema "Multiband and wideband antenna":

Brocato, Robert Wesley. Hemispheric ultra-wideband antenna. Office of Scientific and Technical Information (OSTI), aprile 2006. http://dx.doi.org/10.2172/921149.

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Newman, E. M., e C. M. Ruskowski. Cylindrical Lens-Array Antenna for Wideband Electronic Scanning. Fort Belvoir, VA: Defense Technical Information Center, marzo 1985. http://dx.doi.org/10.21236/ada156085.

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Mital, Rashmi, Dharmesh P. Patel, Jaganmohan B. Rao e Greg C. Tavik. Affordable Wideband Multifunction Phased Array Antenna Architectures Using Frequency Scaled Radiating Elements. Fort Belvoir, VA: Defense Technical Information Center, settembre 2014. http://dx.doi.org/10.21236/ada610684.

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Farr, Everett G., e Charles A. Frost. Ultra-Wideband Antennas and Propagation. Volume 1: Antenna Design, Predictions, and Construction. Fort Belvoir, VA: Defense Technical Information Center, luglio 1997. http://dx.doi.org/10.21236/ada328786.

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Farr, Everett G., e Charles A. Frost. Ultra-Wideband Antennas and Propagation. Volume 2: Antenna Measurements and Signal Processing. Fort Belvoir, VA: Defense Technical Information Center, luglio 1997. http://dx.doi.org/10.21236/ada328787.

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Rice, Michael, e Mohammad Saquib. On Optimum Power Allocation for Multi-Antenna Wideband Helicopter-to-Ground Communications. Fort Belvoir, VA: Defense Technical Information Center, marzo 2014. http://dx.doi.org/10.21236/ada622040.

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Zaghloul, Amir I., Youn M. Lee, Gregory A. Mitchell e Theodore K. Anthony. Enhanced Ultra-Wideband (UWB) Circular Monopole Antenna with Electromagnetic Band Gap (EBG) Surface and Director. Fort Belvoir, VA: Defense Technical Information Center, agosto 2014. http://dx.doi.org/10.21236/ada608706.

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