Relevant bibliographies by topics / Compact spiral antennas

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Compact spiral antennas'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Compact spiral antennas"

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Habeeb Bello, Khalid Idris Nazifi, and Sanusi Mohammed Sadiq. "Investigation and design methods of a compact patch antennas using 3-D MMIC for various applications." Global Journal of Engineering and Technology Advances 15, no. 3 (June 30, 2023): 096–106. http://dx.doi.org/10.30574/gjeta.2023.15.3.0109.

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This work focused on the design, characterization and investigation of GaAs based multi-layered compact 3D MMIC based antenna. Different patch antennas were designed and characterized along with its S-parameters. Two proposed models of multi-layered patch antenna using V-shaped feeder line and planar feeder line with a spiral transmission line in metal-2 were more compact in size and showed an improvement in performance based on bandwidth compared to the traditional planar feeder line configuration. This implies the proposed planar feed line with the spiral transmission is cost effective. The newly propose planar antenna with a spiral transmission feeder line is 49% more compact in area compared to using the normal planar feeder line. The new design also has wider bandwidth with a bandwidth of 2.99% as compared to the traditional planar with a bandwidth of 1.93%, better input return loss and a slightly lower resonance frequency. Similarly, another multilayer patch antenna was proposed using a V-shaped feeder line, This V-shaped feeder line antenna model showed a much lower resonance frequency (36.50 GHz) compared to normal planar (38.92GHz) and the planar with spiral transmission line model (38.52 GHz).
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Das, Swarup, Debasis Mitra, and Sekhar Ranjan Bhadra Chaudhuri. "Design of UWB Planar Monopole Antennas with Etched Spiral Slot on the Patch for Multiple Band-Notched Characteristics." International Journal of Microwave Science and Technology 2015 (October 20, 2015): 1–9. http://dx.doi.org/10.1155/2015/303215.

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Three types of Ultrawideband (UWB) antennas with single, double, and triple notched bands are proposed and investigated for UWB communication applications. The proposed antennas consist of CPW fed monopole with spiral slot etched on the patch. In this paper single, double, and also triple band notches with central frequency of 3.57, 5.12, and 8.21 GHz have been generated by varying the length of a single spiral slot. The proposed antenna is low-profile and of compact size. A stable gain is obtained throughout the operation band except the three notched frequencies. The antennas have omnidirectional and stable radiation patterns across all the relevant bands. Moreover, relatively consistent group delays across the UWB frequencies are noticed for the triple notched band antenna. A prototype of the UWB antenna with triple notched bands is fabricated and the measured results of the antenna are compared with the simulated results.
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Zhao, Dechun, Xiaoyu Chen, Longsheng Zhang, and Huiquan Zhang. "Design of the Micro-Strip Antenna for Wireless Capsule Endoscope." Journal of Information Technology Research 8, no. 3 (July 2015): 43–58. http://dx.doi.org/10.4018/jitr.2015070103.

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This paper analyzed the type of mini-type antenna, studied the miniaturization technique based on simulation in depth, and finally designed the high-performance micro-strip antenna. The advantages of micro-strip antenna are light-weight, compact size, relatively thin thickness, and so on. However, it still needs aggressive miniaturization to satisfy the requirements of encapsulation. Techniques for miniaturization of antenna mainly include a ground plane, double-layer patch, shorting pin or wall, lossless dielectric substrate and the spiral structure. The techniques of multi-layer and shorting wall can narrow down the resonant frequency and attain bandwidth enhancement. Nonetheless, they have a complicated structure. Thus, simulation researched the influence of the surrounding tissue in detail, the position relation of shorting pin and the feed point, the substrate parameters and the structure parameters of the spiral antenna on performance. At last, through the techniques of the shorting pin, high permittivity substrate and the spiral shape, two Archimedean micro-strip patch antennas were developed for wireless capsule endoscope. The antenna has the bandwidth of about 300 MHz, the minimum voltage standing-wave ratio of 1.14:1, and the diameter of 8.3 mm. Therefore, the antenna can offer excellent performance for transmitting image data.
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Elsheakh, Dalia M., and Esmat A. Abdallah. "Compact multiband printed-IFA on electromagnetic band-gap structures for wireless applications." International Journal of Microwave and Wireless Technologies 5, no. 4 (April 3, 2013): 551–59. http://dx.doi.org/10.1017/s1759078713000263.

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Fourth generation mobiles require multi-standard operating handsets with small physical size as well as increasing demand for higher data rates. Compact multi-band printed inverted-F antennas (IFA) for available wireless communications are proposed in this paper. New design of printed IFA based on uniplanar compact electromagnetic band-gap (EBG) structure concept is proposed. A printed-IFA with L-load shaped over an artificial ground plane is designed as the main antenna to cover most wireless applications such as GSM, LTE, UMTS, Bluetooth, Wimax, and WLAN. The multi-band is created by means of an EBG structure that is used as a ground plane. Different shapes of uniplanar EBG such as ring, split ring resonator, and spiral rather than mushroom-like structure are investigated. The proposed antenna is built on the uniplanar EBG ground plane with size of 35 × 45 mm2, which is suitable for most of the mobile devices.
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Elsheakh, Dalia, and Esmat Abdallah. "Compact Multiband Printed IFA on Electromagnetic Band-Gap Structures Ground Plane for Wireless Applications." International Journal of Microwave Science and Technology 2013 (February 12, 2013): 1–9. http://dx.doi.org/10.1155/2013/248501.

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The fourth mobile generation requires of multistandard operating handsets of small physical size as well as has an increasing demand for higher data rates. Compact multiband printed inverted-F antennas (IFAs) for available wireless communications are proposed in this paper. A new design of a printed IFA based on a uniplanar compact EBG concept is proposed. An L-loaded printed IFA shaped over an artificial ground plane is designed as the main antenna to cover the GSM, LTE, UMTS, bluetooth, and WLAN. The multi-band is created by means of an electromagnetic band-gap (EBG) structure that is used as a ground plane. Different shapes of uniplanar EBG as ring, split ring resonator, and a spiral rather than mushroom-like structure are investigated. The proposed antenna is built on the uniplanar EBG ground plane with a size of 35×45 mm2, which is suitable for most of the mobile devices.
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Setiyowati, Diah, Syah Alam, and Indra Surjati. "Miniaturization of Microstrip Antenna Using Spiral labyrinth Method at Frequency of Work 3.5 GHz." JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING 5, no. 2 (January 26, 2022): 520–31. http://dx.doi.org/10.31289/jite.v5i2.5650.

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Along with the times, communication technology has developed so that it is currently included in the Fifth Generation (5G) Communication System. The 5G communication system is divided into three frequency categories, namely low band, middle band and high band. One of the important devices in the telecommunications sector is the antenna. Antenna serves to send and receive electromagnetic signals at a certain working frequency. Currently, antennas have been completely integrated into the needs of modern society. One type of antenna that can support the needs of today's technology is a microstrip antenna. This antenna has several advantages, especially in its antenna compact design, low profile configuration and affordable manufacturing costs. In this article, a microstrip antenna is designed with the spiral labyrinth method that works at a frequency of 3.5 GHz for 5G communication system. Propsosed antena designed using RT Duroid R5880 with dielectric constant ( ) 2.2, dielectric loss (loss tan) 0.0009 and thickness (h) 1.57 mm. The simulation results show the reflection coefficient -29.58 dB, VSWR 1.069, gain 6.432 dB at frequency of 3.5 GHz . Spiral labyrinth has been succesfully reduced patch antenna and enclosure until 22.5% and 24.8%, respectively.
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Kola, Kalyan Sundar, Anirban Chatterjee, and Deven Patanvariya. "Design of a compact high gain printed octagonal array of spiral-based fractal antennas for DBS application." International Journal of Microwave and Wireless Technologies 12, no. 8 (April 6, 2020): 769–81. http://dx.doi.org/10.1017/s1759078720000239.

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AbstractThis paper presents a compact octagonal array of microstrip patch antennas for direct broadcast satellite (DBS) (12.2–12.7 GHz) services. The proposed single element of this array is a new fractal antenna, having considerably high gain and can heavily suppress cross polarization along the main beam direction. The single element is derived from a 2D spiral geometry. The corporate feed network of the array is designed in such a manner to make the structure very compact. The fabricated single element resonates at 12.51 GHz and gives a gain and bandwidth of 9.32 dBi and 280 MHz, respectively. The array resonates at 12.46 GHz and gives gain of 17.67 dBi and a bandwidth of 506 MHz, which ensures a 100% coverage of the entire DBS service band. The measured cross polarization of single element and array along the direction of main beam are −45.50 and −43.35 dB, respectively. Both the single element as well as the array maintains a reasonably good radiation efficiency of 86.70 and 82.20%, respectively.
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Yahyaoui, Ali, Ahmed Elsharabasy, Jawad Yousaf, and Hatem Rmili. "Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting." Sensors 20, no. 24 (December 8, 2020): 7023. http://dx.doi.org/10.3390/s20247023.

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This work presents the design and analysis of a metal-insulator-metal (MIM)-based optical log spiral rectenna for efficient energy harvesting at 28.3 THz. To maximize the benefits of the enhanced field of the proposed nano-antenna in the rectification process, the proposed design considers the antenna arms (Au) as the electrodes of the rectifying diode and the insulator is placed between the electrode terminals for the compact design of the horizontal MIM rectenna. The rectifier insulator, Al2O3, was inserted at the hotspot located in the gap between the antennas. A detailed analysis of the effect of different symmetric and asymmetric MIM-configurations (Au-Al2O3-Ag, Au-Al2O3-Al, Au-Al2O3-Cr, Au-Al2O3-Cu, and Au-Al2O3-Ti) was conducted. The results of the study suggested that the asymmetric configuration of Au-Al2O3-Ag provides optimal results. The proposed design benefits from the captured E-field intensity, I-V, resistivity, and responsivity and results in a rectenna that performs efficiently.
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Guinvarc'h, Regis, Mohammed Serhir, and Fabrice Boust. "A Compact Dual-Polarized 3:1 Bandwidth Omnidirectional Array of Spiral Antennas." IEEE Antennas and Wireless Propagation Letters 15 (2016): 1909–12. http://dx.doi.org/10.1109/lawp.2016.2542982.

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Kim, Jang-Yeol, Nam Kim, Seungwoo Lee, and Kwan-Ho Shin. "Compact Printed Antennas for Triple Band-Notched UWB Using Cmlsrrs And Spiral Resonators." Microwave and Optical Technology Letters 55, no. 10 (July 26, 2013): 2265–69. http://dx.doi.org/10.1002/mop.27944.

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Dissertations / Theses on the topic "Compact spiral antennas"

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O'brien, Jonathan. "Medium Power, Compact Periodic Spiral Antenna." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4926.

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Historical, well developed, procedures for RF design have minimal emphasis on exploring the third dimension due to the difficulty of fabrication. Recent material advancements applicable to 3D printing have brought about low-loss thermoplastics with excellent mechanical properties. Research into depositing conductive inks onto arbitrary 3D shapes has achieved resolutions better than 50 μm with conductivity values approaching that of copper cladding. The advancements in additive manufacturing have improved reliability and repeatability of three dimensional designs while decreasing fabrication time. With this design approach other considerations, such as stability and strength, can be concentrated on during the structure design to realize new shapes. The next step in the future of RF research will encompass designing and further understanding the benefits and consequences of using all three dimensions. This could include meandering an antenna element around other electronic components to make the overall package size smaller or integrating an antenna array into a wing. The design and analysis of the periodic spiral antenna (PSA) takes a look at a specific case of full volume utilization. In this application meandering in the z-dimension allowed the design to become smaller and more efficient than what is achievable with planar methods. This thesis will go into detail on the characterization of the periodic spiral antenna. To exemplify the benefits of meandering in the z-dimension a loop antenna is presented and benchmarked against other miniaturization techniques. Measured results of two different PSA models are presented and remarks on improving fabrication are given. When an antenna is used as a transmitter incident power will cause thermal generation so a study was conducted to understand how material properties can govern the amount of heat generated.
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Pigeon, Mélusine. "Etude et réalisation d'antennes ultra-compactes à base de métamatériaux : Application à la réalisation d'une antenne GNSS miniature." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2011. http://tel.archives-ouvertes.fr/tel-01063404.

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Nous proposons d'explorer dans le cadre de la thèse des solutions originales permettant d'obtenir des caractéristiques de rayonnement peu dépendantes du support de l'antenne. Les antennes étudiées et conçues visent à être utilisées pour des applications GNSS et plus précisément pour des applications multi-bandes du GNSS. Nous les développerons donc en respectant un cahier des charges associé. Deux axes de recherche indépendants sont explorés. Le premier montre les propriétés naturelles d'une antenne composée de plusieurs structures rayonnantes. Nous associons ainsi une structure hélicoïdale équivalente à un dipôle magnétique et un plan métallique équivalent à un dipôle électrique. La taille et les performances de l'antenne ainsi réalis ée sont comparables par bien des aspects aux antennes que l'on trouve actuellement dans le commerce pour les applications GNSS. L'antenne réalisée est une antenne mono-bande en polarisation rectiligne ; ce qui n'est pas en accord avec les spécifications de l'application envisagée. Pour compléter cette première étude et satisfaire les exigences d'applications GNSS multi-bandes, nous nous orientons vers une autre technologie qui est exposé dans le second axe. Dans le second axe, nous associons une antenne électrique et un plan ré ecteur particulier : une Surface Haute Impédance. L'association de ces deux éléments permet en théorie de réduire l'épaisseur qu'aurait un dispositif classique composé d'une antenne électrique et d'un plan réflecteur métallique. Nous commençons donc par étudier la particularité du plan réflecteur choisi, c'est-à-dire la Surface Haute Impédance. Cette surface étant composé de motifs périodiques nous étudierons le motif qui permet d'obtenir les caractéristiques les plus proches de celles de l'application visée. Nous débutons par une étude en monobande suivi de l'étude d 'un motif bi-bande. Le motif mono-bande conçu en simulation présente une très bonne bande-passante (13%) au vue de sa taille minimale (2,5mm). Le motif bi-bande réalisé par imbrication de motifs mono-bande permet d'obtenir en simulation des performances conformes aux attentes dans deux bandes GNSS choisies. L'étude de cette surface se poursuit par une phase de mesure. Le but de l'étude étant de pouvoir placer une antenne au-dessus de la surface fabriquée, une collection d'antennes sera développée afin de régler la surface haute impédance et dans le même temps de tester le dispositif complet. Ainsi dans un premier temps, nous utiliserons des dipôles pour tester et régler la Surface Haute Impédance. Dans cette partie le couplage entre l'antenne et la surface haute impédance placée en-dessous sera notamment étudié. Dans un deuxième temps, afin d'obtenir une polarisation circulaire nous utiliserons d'autres antennes supportant cette polarisation (dipôle croisé et spirale). Dans chaque phase de mesure, le réglage antenne et Surface Haute Impédance sera optimisé et divers paramètres de réglage seront identifiés. Pour les deux axes de recherche, ce sont non seulement le rayonnement que nous cherchons à maîtriser mais aussi la taille de la structure. Ainsi les structures réalisées sont les plus compactes possibles surtout en terme de finesse. Nous concluons sur les performances des antennes réalisées par rapport au cahier des charges et aux autres antennes existantes et exposons les perspectives du travail réalisé.
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Couty, Eric. "Conception d'antennes compactes pour des applications embarquées large bande." Limoges, 1999. http://www.theses.fr/1999LIMO0017.

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Ce memoire presente une synthese sur l'etude de faisabilite d'une antenne large bande, a faible encombrement, couvrant partiellement les domaines vhf-uhf. Ces travaux ont ete menes en partenariat avec le commissariat a l'energie atomique / centre d'etudes scientifiques et techniques d'aquitaine (cea / cesta). Les solutions retenues sont en premier lieu seules, puis dans leur contexte : sur un cone metallique. Le defi represente par le developpement d'un aerien offrant simultanement une integration importante et un fonctionnement sur une plage frequentielle etendue, a conduit, dans un premier temps, a s'orienter vers l'emploi d'antennes a resonance pilotee. L'analyse numerique a ete menee au moyen d'un outil fdtd, puis validee par la realisation et la mesure d'un demonstrateur. Dans un deuxieme temps, une bande de fonctionnement plus etroite a ete prise en compte. Cette modification a conduit a s'interesser a des spirales planaires a fortes pertes, mises au point numeriquement et caracterisees experimentalement. Un modele analytique approche, qui permet de cerner leurs performances a moindre cout, a en outre ete defini. Les dispositifs ont ensuite ete places sur un support conique metallique, dont l'influence est prise en compte. Pour ce faire, plusieurs positions ont ete considerees.
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Momen, Mehrabani Ali. "Radiation and polarization diversities of compact Archimedean spiral antennas." 2014. http://hdl.handle.net/1993/30074.

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In this thesis, four-arm Archimedean spiral antennas are investigated, which are low profile and have compact structure. The operating frequency bands can be designed for any microwave and millimeter frequency ranges and the antenna may be utilized in any desired applications such as Global Positioning Systems, radars, navigation systems, modern satellite communications, adaptive nulling, beam shaping, and direction finding. The concept of cavity backed absorber-filled structure along with a small ground plane embedded inside, as an inexpensive and wideband balun, is employed to reduce the axial size of the antenna. The antenna can generate broadside and boresight-null radiation patterns at the dominant and higher order modes, respectively. The study demonstrates that the proposed compact structure successfully supports the excitation of higher order modes. Polarization diversity of spiral antennas is mathematically described for an N-arm spiral antenna along with the required feeding networks. Realization of circularly-polarized broadside radiation patterns, with both senses of polarization, is then elaborated for a center-fed low-profile four-arm Archimedean spiral antenna. The radiation active zones, for generating both right- and left-handed circular polarization waves, are determined and the antenna performance in a frequency band, shared by both senses of polarization, is investigated. The developed antennas can be utilized in frequency reuse applications to enhance the wireless channel capacity and as primary feeds in high gain reflector antennas. Their performance in small front-fed parabolic reflector antennas is numerically investigated. It is shown that excellent circular polarization performance, with a remarkable radiation pattern symmetry and axial ratios below 0.5dB, low cross polarization components, and reflector total efficiencies, as high as 77.8% can be attained. Moreover, backward radiation properties of center-fed four-arm Archimedean spiral antennas are also explored, and their possible applications in reflector antennas are presented. Finally, the proposed dual-polarized spiral antennas are further investigated by dielectric loading, for size reduction purposes and frequency tuning applications. Both full and partial dielectric loadings are considered and investigated for the spiral antenna performance. A grooved dielectric substrate is also utilized to enable generating low-contrast dielectric permittivities. The spiral antenna performance, etched on such a grooved substrate, is similarly investigated.
February 2015
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Roy, Aritra. "Design of Compact Antennas With Metasurface for Wideband and Wireless Applications." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6034.

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An antenna is one of the essential elements in a wireless system, that converts the guided waves in an electronic circuit to unguided waves in the air and vice versa. They are often designed according to the specifications of the underlying system. Compact antennas are required in miniaturised systems such as those used in an aircraft. They are designed by modifying or appending the antenna with additional structures or circuit elements without degrading its responses. In this thesis, the design of compact antennas is investigated with metasurface for two unique purposes - i. wideband applications for detection/sensing application, and ii. spatial modulation to communicate a multipath environment. For wideband applications, a spiral antenna is considered a primary radiator due to its wideband impedance matching and circular polarization (CP) response with simple and planar geometry. It has a bidirectional radiation pattern on either side of the structure, along the axis of the antenna. But in many practical applications, a single-sided radiation pattern is extracted by placing it above a metallic body of a ship or aircraft, which disturbs the freestanding radiation response of the antenna. A conductor placed more than half a wavelength away from the spiral reduces the boresight gain significantly at high frequency, whereas the same placed too close to the antenna degrades the matching and polarization performance at low frequency. These issues have been addressed over years with different techniques, but the design of compact spiral still possesses significant challenges especially when a frequency band of 1-18~GHz is considered. As this research work begins, the spiral is placed at different heights above a metallic conductor and the effects are observed over the considered frequency range. It is followed by an investigation with profiled metallic geometries to combine the benefits of varying antenna heights at different frequencies. Based on these observations, a compact spiral antenna is designed by placing it above a modified conical conductive backing to radiate a CP wave over a wide frequency band. In the next part of this thesis, some of the challenges at low frequencies are addressed using different absorber techniques when the spiral is kept extremely close to a conductor. A hybrid technique consisting of absorbing material and resistors is proposed to design such a compact spiral antenna for wideband application. To improve the performance below 2~GHz, a wideband metasurface absorber is investigated with the spiral. The metasurface possesses significant electromagnetic absorption at low frequency and has been used to design a spiral antenna for 1-18~GHz with an extremely low profile. Another work with a compact spiral antenna approaches to tilt its main beam over a wide frequency range. This investigation is required to compensate for the shift in the antenna main beam due to the supporting structure or to tilt the antenna main beam in a given direction for different purposes. A semicircular lens made of lossy dielectric material is placed above a compact spiral to fulfil this requirement. Effects of different material properties and lens profiles are investigated to arrive at the final design. Since placing the lens along the spiral affects the compactness of the antenna and disturbs the planar profile required in a flush mounting configuration, a sectoral metasurface is designed and printed on the backside of the antenna substrate. The metasurface possesses effective material properties to tilt the antenna main beam at a consistent angle. For all cases, numerical investigations were carried out to optimize the antenna geometries followed by prototyping and characterization of some of these structures. The measured results are compared with the simulated outcomes and the numerical predictions have been verified. This required the design and realization of a wideband balun and appropriate fixtures to integrate various parts of this antenna in a flush-mount arrangement. For a unique wireless application with a compact antenna, a digitally reconfigurable metasurface in the vicinity of a patch antenna is proposed, to realize for the first time a modulator for a spatial modulation technique known as media-based modulation (MBM). MBM facilitates a fast, secure, and multiuser wireless link in a multipath environment (e.g., indoor or office environments) by exploiting the multipath components of the channel. The metasurface works as an electromagnetic window as the power flowing through the unit cell can be electronically controlled by switching a PIN diode embedded within. A significant difference in transmission coefficient is observed between the two switching states of the unit cell. A meander geometry is used to make it compact and the diode is placed between the meander and one of the two contiguous strips that provides the necessary biasing to the diode. Numerical investigations are carried out to characterize the unit cell, and to optimize the array dimensions and the gap between metasurface and antenna. A prototype of the array is fabricated with the necessary control circuitry and a complete wireless link is set up to communicate in a real-time environment. Experiments are carried out in different scatter free and scattering environments in line of sight and non-line of sight configurations to validate the theoretical predictions of MBM. The effects of multipath as a factor that improves communication performance are also validated. In the end, data transmission over a wireless link is also demonstrated using this scheme.
Ministry of Education, Govt. of India and Thales Defence Mission Systems
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Zhu, F., S. Gao, A. T. S. Ho, Chan H. See, Raed A. Abd-Alhameed, J. Li, and J. Xu. "Compact-size linearly tapered slot antenna for portable ultra-wideband imaging systems." 2012. http://hdl.handle.net/10454/9771.

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No
A compact-size asymmetrical linearly tapered slot antenna required for portable ultra-wideband (UWB) imaging systems is presented. The total antenna size is reduced compared with the conventional linearly tapered slot antenna by using a triangular slot on the left-hand side of the tapered-shaped radiator, whereas introducing a corrugated pattern of cuts on the right side. The antenna operates over a wide bandwidth extending from 3.1 to 10.6 GHz with a maximum gain of 8.5 dBi. Stable radiation patterns are observed across the operational bandwidth, with cross-polarization levels below 20 dB. The realized antenna structure occupies a volume of 35 x 36 x 0.8 mm3, and possesses the essential time domain fidelity needed for UWB imaging applications. (c) 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2013.
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Wang, Shao-Wei, and 王紹偉. "A Compact Multi-Band Antenna with Composite Spiral and PIFA Structure for Mobile Application." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/84060243365315650183.

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碩士
臺灣大學
電信工程學研究所
98
With the WiMAX (Worldwide Interoperability for Microwave Access) protocol springing up, the mobile device demand are getting more and more, and multi-band antennas emerge. Designing antenna becomes harder because mobile devices are getting smaller and thinner. This thesis focuses on multi-band manipulation by using spiral-shaped monopole for high-frequency band and planar inverted-F antenna (PIFA) for low-frequency band, and feeding them with an offset microstrip line to make the characteristics in high and low frequency bands can be adjusted almost independently.
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Eubanks, Travis Wayne. "A Compact Parallel-plane Perpendicular-current Feed for a Modified Equiangular Spiral Antenna and Related Circuits." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7801.

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This work describes the design and measurement of a compact bidirectional ultrawideband (UWB) modified equiangular spiral antenna with an integrated feed internally matched to a 50-Ohm microstrip transmission line. A UWB transition from microstrip to double-sided parallel-strip line (DSPSL) soldered to a short (1.14 mm) twin-line transmission line feeds the spiral. The currents on the feed travel in a direction approximately perpendicular to the direction of the currents on the spiral at the points where the feed passes the spiral in close proximity (0.57 mm). Holes were etched from the metal arms of the spiral to reduce the impedance mismatch caused by coupling between the transmission line feed and the spiral. This work also describes a low-loss back-to-back transition from coaxial line to DSPSL, an in-phase connectorized 3 dB DSPSL power divider made using three of those transitions, a 2:1 in-phase DSPSL power divider, a 3:1 in-phase DSPSL power divider, a radial dipole fed by DSPSL, an array of those dipoles utilizing the various power dividers, and a UWB circular monopole antenna fed by DSPSL. Measured and simulated results show good agreement for the designed antennas and circuits.
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Conference papers on the topic "Compact spiral antennas"

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Valleau, J., H. Aubert, O. Ripoche, A. Bellion, P. Potier, and P. Pouliguen. "Pre-fractal resonant rings for compact spiral antennas." In 2014 16th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM). IEEE, 2014. http://dx.doi.org/10.1109/antem.2014.6887706.

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Sree Lakshmi, P. V., and M. Sumi. "Compact spiral antennas for multiband and wideband operations." In 2016 International Conference on Next-Generation Intelligent Systems (ICNGIS). IEEE, 2016. http://dx.doi.org/10.1109/icngis.2016.7854077.

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Nguyen, Truong Khang, Insang Woo, Hosung Choo, and Ikmo Park. "A compact dual spiral line loaded monopole antenna." In 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396307.

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Barton, Richard J., Peter J. Collins, Paul E. Crittenden, Michael J. Havrilla, and Andrew J. Terzuoli. "A compact passive broadband hexagonal spiral antenna array." In 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396518.

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Zack, Kevin, Haider Khaleel, Ayman Isaac, and Ayad Bihnam. "Compact spiral antenna for space based applications." In 2014 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2014. http://dx.doi.org/10.1109/aps.2014.6905180.

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Muller, D., and K. Sarabandi. "A Broadband and Compact Edge-fed 3-Arm Spiral Antenna." In 2006 IEEE Antennas and Propagation Society International Symposium. IEEE, 2006. http://dx.doi.org/10.1109/aps.2006.1711416.

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Wang, Sen, Hao Li, Yunpeng Zhang, Jiawei Long, and En Li. "A Helix-loaded Equiangular Spiral Antenna with Compact Structure." In 2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE). IEEE, 2018. http://dx.doi.org/10.1109/isape.2018.8634203.

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Sharma, Chetna, and V. Dinesh Kumar. "Koch fractalized compact spiral antenna based on Fibonacci sequence." In 2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2016. http://dx.doi.org/10.1109/apcap.2016.7843146.

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Pouhe, David, and Alexander Feldberg. "An Outer End-Fed Compact Four-Arm Spiral Antenna." In 2022 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). IEEE, 2022. http://dx.doi.org/10.1109/apwc49427.2022.9899874.

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Shirvante, Vivek, Fabien Todeschini, Xiaoyu Cheng, and Yong-Kyu Yoon. "Compact spiral antennas for MICS band wireless endoscope toward pediatric applications." In 2010 IEEE International Symposium Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting. IEEE, 2010. http://dx.doi.org/10.1109/aps.2010.5561085.

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