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Journal articles on the topic 'Ultrawideband antennas'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Kumar, Om Prakash, Pramod Kumar, Tanweer Ali, Pradeep Kumar, and Shweta Vincent. "Ultrawideband Antennas: Growth and Evolution." Micromachines 13, no. 1 (December 30, 2021): 60. http://dx.doi.org/10.3390/mi13010060.

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Narrowband antennas fail to radiate short pulses of nano- or picosecond length over the broader band of frequencies. Therefore, Ultrawideband (UWB) technology has gained momentum over the past couple of years as it utilizes a wide range of frequencies, typically between 3.1–10.6 GHz. UWB antennas have been utilized for various applications such as ground-penetrating radars, disaster management through detection of unexploded mines, medical diagnostics, and commercial applications ranging from USB dongles to detection of cracks in highways and bridges. In the first section of the manuscript, UWB technology is detailed with its importance for future wireless communications systems. In the next section various types of UWB antennas and their design methodology are reviewed, and their important characteristics are highlighted. In section four the concept of a UWB notch antenna is presented. Here various methods to obtain the notch, such as slots, parasitic resonators, metamaterials, and filters are discussed in detail. In addition, various types of important notch antenna design with their technical specifications, advantages, and disadvantages are presented. Finally, the need of reconfigurable UWB notch antennas is discussed in the next section. Here various insight to the design of frequency reconfigurable notch antennas is discussed and presented. Overall, this article aims to showcase the beginnings of UWB technology, the reason for the emergence of notching in specific frequency bands, and ultimately the need for reconfiguring UWB antennas along with their usage.

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2

Ghorbani, Mehdi, and Habib Ghorbaninejad. "A Novel Ultrawideband Gear-Shaped Dielectric Ring Resonator Antenna." Mathematical Problems in Engineering 2021 (July 12, 2021): 1–8. http://dx.doi.org/10.1155/2021/8069873.

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In this study, a novel ultrawideband (UWB) dielectric ring resonator (DRR) antenna has been proposed. DRR antennas include a single monopole antenna in the center of a ground plane and a dielectric with a symmetric structure around the monopole. This structure will lead to ultrawide band antenna. However, it is still possible to enhance the antenna bandwidth. In this study, we combine the DRR structure with an array antenna. The proposed antenna includes a circular array of four triangle resonators, which is rotated around the center of the triangle base to form a gear-shaped ring resonator antenna. In this design, characteristics of all these antennas are combined to enhance the antenna bandwidth including triangular dielectric resonator, circular array antenna, dielectric ring resonator structure, and a quarter-wave electric monopole. Triangular dielectric resonator antennas are wideband and in small size. Ring resonator antennas are inherently ultrawideband. Quarter-wave electric monopole and circular array structure can also enhance antenna bandwidth. This novel shape of the DRR antenna possesses the wider impedance bandwidth compared to similar works. Impedance bandwidth is 150% (5.2–36.1 GHz), and the bandwidth ratio is 1 : 6.9, which is much greater than earlier reports.

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3

Sheikh, Sharif I. Mitu, W. Abu-Al-Saud, and A. B. Numan. "Directive Stacked Patch Antenna for UWB Applications." International Journal of Antennas and Propagation 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/389571.

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Directional ultrawideband (UWB) antennas are popular in wireless signal-tracking and body-area networks. This paper presents a stacked microstrip antenna with an ultrawide impedance bandwidth of 114%, implemented by introducing defects on the radiating patches and the ground plane. The compact (20×34 mm) antenna exhibits a directive radiation patterns for all frequencies of the 3–10.6 GHz band. The optimized reflection response and the radiation pattern are experimentally verified. The designed UWB antenna is used to maximize the received power of a software-defined radio (SDR) platform. For an ultrawideband impulse radio system, this class of antennas is essential to improve the performance of the communication channels.

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4

Jairath, Kapil, Navdeep Singh, Mohammad Shabaz, Vishal Jagota, and Bhupesh Kumar Singh. "Performance Analysis of Metamaterial-Inspired Structure Loaded Antennas for Narrow Range Wireless Communication." Scientific Programming 2022 (May 19, 2022): 1–17. http://dx.doi.org/10.1155/2022/7940319.

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Nowadays, the demand for low-cost, compact, and interference rejected antennas with ultrawideband capability has been increased. Metamaterial-inspired loaded structures have capability of providing exceptional solutions for narrow range wireless communication and low consuming power while transmitting and receiving the signal. It is a difficult task to construct ideal metamaterial-inspired antennas with a variety of features such as extremely large bandwidth, notching out undesirable bands, and frequency. Metamaterial-inspired structures such as SRR and CSRR, and triangle-shaped TCSRR are most commonly used structures to achieve optimized characteristics in ultrawideband antennas. In this paper, an extensive literature survey is accomplished to get conception about metamaterial-inspired patch antennas. This review paper elucidates variants of metamaterial-inspired structures/resonators utilized in order to acquire sundry applications such as WiMAX, WLAN, satellite communication, and radar. Various researchers have used different methodology to design, stimulate, and analyze the metamaterial-inspired structure loaded antennas. Also, the results of different metamaterial-inspired antennas such as bandwidth, gain, return loss, and resonant frequency have been also represented in this paper. This manuscript also gives brief introduction about the metamaterial, its types, and then its application in microstrip patch antenna over the last decade. This manuscript throws light over the various studies conducted in the field of metamaterial-inspired antenna in the past. It has been seen that with the inclusion of metamaterial in conventional antenna, various characteristics such as impedance bandwidth, reflection coefficient, gain, and directivity have been improved. Also, frequency rejection of narrow bands which exits in ultrawideband frequency range can be done by embedding metamaterial-inspired structures such as SRR and CSRR.

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5

Alsawaha, Hamad Waled, and Ahmad Safaai-Jazi. "Ultrawideband Hemispherical Helical Antennas." IEEE Transactions on Antennas and Propagation 58, no. 10 (October 2010): 3175–81. http://dx.doi.org/10.1109/tap.2010.2055806.

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6

Et. al., B. Shruthi,. "Design Of Enhanced Bandwidth Of Dual Element MIMO Antenna For Wireless Applications." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 6 (April 11, 2021): 1030–36. http://dx.doi.org/10.17762/turcomat.v12i6.2415.

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A multiple-input-multiple-output lightweight printed ultrawideband antenna among a dimension about 40×50mm2to minimise the coupling between these two antennas, the proposed antenna with a quarter circular radiating patch, with defected ground structure is designed. The antenna developed by MIMO is highly isolated, stronger than -15dB. In the working band, from 2.67GHz to 14GHz. The simulation indicates that the proposed MIMO antenna will balance the complete enhanced band with a broad bandwidth by making use of CST. It operates at 5.83GHz, 8.07GHz, 12.28GHz and bandwidth tends to cover the ultrawideband range. UWB band and high isolation, that assemblesit perfect for any application of wireless modules in the UWB range, in order to minimise coupling. For indoor applications and wireless applications these frequency range is used.

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7

Alibakhshi Kenari, Mohammad. "Design and Modeling of New UWB Metamaterial Planar Cavity Antennas with Shrinking of the Physical Size for Modern Transceivers." International Journal of Antennas and Propagation 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/562538.

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A variety of antennas have been engineered with MTMs and MTM-inspired constructs to improve their performance characteristics. This report describes the theory of MTMs and its utilization for antenna's techniques. The design and modeling of two MTM structures withε-μconstitutive parameters for patch antennas are presented. The framework presents two novel ultrawideband (UWB) shrinking patch antennas filled with composite right-/left-handed transmission line (CRLH-TL) structures. The CRLH-TL is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. The CRLH-TL structures enhance left-handed (LH) characteristics which enable size reduction and large frequency bandwidth. The large frequency bandwidth and good radiation properties can be obtained by adjusting the dimensions of the patches and CRLH-TL structures. This contribution demonstrates the possibility of reducing the size of planar antennas by using LH-transmission lines. Two different types of radiators are investigated—a planar patch antenna composed of fourO-formed unit cells and a planar patch antenna composed of sixO-shaped unit cells. A CRLH-TL model is employed to design and compare these two approaches and their realization with a varying number ofL-Cloaded unit cells. Two representative antenna configurations have been selected and subsequently optimized with full-wave electromagnetic analysis. Return loss and radiation pattern simulations of these antennas prove the developed concept.

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8

Ray, K. P., and Y. Ranga. "Ultrawideband Printed Elliptical Monopole Antennas." IEEE Transactions on Antennas and Propagation 55, no. 4 (April 2007): 1189–92. http://dx.doi.org/10.1109/tap.2007.893408.

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9

Duroc, Y., A. Ghiotto, T. P. Vuong, and S. Tedjini. "Parametric Modeling of Ultrawideband Antennas." IEEE Transactions on Antennas and Propagation 55, no. 11 (November 2007): 3103–5. http://dx.doi.org/10.1109/tap.2007.908573.

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10

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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11

Pavithra, P., A. Sriram, and K. Kalimuthu. "Compact planar ultrawideband MIMO antenna for wireless applications." International Journal of Advances in Applied Sciences 8, no. 3 (September 1, 2019): 243. http://dx.doi.org/10.11591/ijaas.v8.i3.pp243-250.

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<p>A compact microstrip fed printed monopole MIMO antenna with ultrawideband (UWB) frequency response (S11< -10 dB for 3.1-10.6 GHz) is proposed in this paper. The proposed antenna is miniaturized and has a high isolation of > 23 dB between the ports compared to the existing UWB multiinput multi output (MIMO) antennas in the literature. The proposed antenna is built on FR4 substrate with thickness of 1.6 mm using all-digital single chip architecture and it is planar in geometry to be easily integrated with the other electronic components in the printed circuit board (PCB). The UWBMIMO antenna is analyzed using simulation and measurements and its performance is investigated. The antenna is extremely useful for low power short range communications and it provides high multipath immunity due to diversity.</p>

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12

Ghimire, Jiwan, and Dong-You Choi. "Design of a Compact Ultrawideband U-Shaped Slot Etched on a Circular Patch Antenna with Notch Band Characteristics for Ultrawideband Applications." International Journal of Antennas and Propagation 2019 (February 18, 2019): 1–10. http://dx.doi.org/10.1155/2019/8090936.

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Interference between ultrawideband (UWB) antennas and other narrowband communication systems has spurred growth in designing UWB antennas with notch characteristics and complicated designs consisting of irregular etched slots and larger physical size. This article presents a simplified notched design method for existing UWB antennas exhibiting four frequency-band-rejecting characteristics. The investigation has been conducted by introducing four semicircular U-shaped slot structures based on a theoretical formulation. The formulation is validated with the equivalent LC lumped parameters responsible for yielding the notched frequency. A novel feature of our approach is that the frequency notch can be adjusted to the desired values by changing the radial length based on the value calculated using a derived formula for each semietched U-slot, which is very simple in structure and design. Additionally, by introducing the rectangular notch at the ground plane, the upper passband spectrum is suppressed while maintaining the wide impedance bandwidth of the antenna applicable for next-generation wireless communications, 5G. The measured result shows that the antenna has a wide impedance bandwidth of 149% from 2.9 to 20 GHz, apart from the four-notched frequencies at 3.49, 3.92, 4.57, and 5.23 GHz for a voltage standing wave ratio (VSWR) of <2 rejecting the Worldwide Interoperability for microwave Access (WiMAX) band at (3.38-3.7 GHz), the European C-band at (3.84-4.29 GHz), the Indian national satellite (INSAT) at (4.47-4.92 GHz), and wireless local area networks (WLANs) at (5.09-5.99 GHz). Measured and simulated experimental results reveal that the antenna exhibits nearly an omnidirectional pattern in the passband, low gain at the stopband, and good radiation efficiency within a frequency range. The LC equivalent notched frequency has been proposed by analyzing the L and C equivalent formula, and it has been validated with simulated and measured results. The measurement and simulated results correspond well at the LC equivalent notch band rejecting the existing narrowband systems.

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13

CLEETUS, Ros Marie C., and Gnanadhas Josemin BALA. "Antenna Reconfiguration Techniques for Cognitive Radio: A Review." Walailak Journal of Science and Technology (WJST) 17, no. 12 (December 1, 2020): 1412–31. http://dx.doi.org/10.48048/wjst.2021.8976.

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As the usage of wireless communicative devices is multiplying day by day, the need for the occupiable radio spectrum is also increasing. The inefficiency in the exploration of available licensed radio spectrum has rerouted the focus to effectively use it against the increasing demand. One of the available methods is to implement Cognitive Radio (CR) technology. The Cognitive Radio uses 2 antennas at a time in order to scan and to communicate with the available spectrum. While an Ultrawideband (UWB) antenna scans the spectrum for unused bands of frequencies, Narrowband (NB) antennas communicate with these sensed unused bands. The technique of Reconfiguration in antennas is found to have a major role in implementing these UWB/NB antennas for CRs. Here in this paper, a survey is conducted on various reconfiguration techniques in antennas to build up a CR system. Each technique is studied in terms of the compactness, novelty, coverage of frequencies, and losses associated with the antenna. Finally, all the techniques are compared on the basis of their merits and demerits in this work.

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14

Freundorfer, A. P., J. Y. Siddiqui, Y. M. M. Antar, and T. Thayaparan. "Characterization of Ultrawideband Antennas Using Noise." IEEE Antennas and Wireless Propagation Letters 9 (2010): 1263–66. http://dx.doi.org/10.1109/lawp.2011.2105237.

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15

Hu, Sanming, Honghui Chen, Choi Look Law, Zhongxiang Shen, Lei Zhu, Wenxun Zhang, and Wenbin Dou. "Backscattering Cross Section of Ultrawideband Antennas." IEEE Antennas and Wireless Propagation Letters 6 (2007): 70–73. http://dx.doi.org/10.1109/lawp.2007.893069.

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16

Adam, Jost, Ludger Klinkenbusch, Henning Mextorf, and Reinhard H. Knochel. "Numerical Multipole Analysis of Ultrawideband Antennas." IEEE Transactions on Antennas and Propagation 58, no. 12 (December 2010): 3847–55. http://dx.doi.org/10.1109/tap.2010.2078448.

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17

Yang, Taeyoung, William A. Davis, and Warren L. Stutzman. "Fundamental-limit perspectives on ultrawideband antennas." Radio Science 44, no. 1 (February 2009): n/a. http://dx.doi.org/10.1029/2007rs003799.

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18

Cicchetti, Renato, Emanuela Miozzi, and Orlandino Testa. "Wideband and UWB Antennas for Wireless Applications: A Comprehensive Review." International Journal of Antennas and Propagation 2017 (2017): 1–45. http://dx.doi.org/10.1155/2017/2390808.

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A comprehensive review concerning the geometry, the manufacturing technologies, the materials, and the numerical techniques, adopted for the analysis and design of wideband and ultrawideband (UWB) antennas for wireless applications, is presented. Planar, printed, dielectric, and wearable antennas, achievable on laminate (rigid and flexible), and textile dielectric substrates are taken into account. The performances of small, low-profile, and dielectric resonator antennas are illustrated paying particular attention to the application areas concerning portable devices (mobile phones, tablets, glasses, laptops, wearable computers, etc.) and radio base stations. This information provides a guidance to the selection of the different antenna geometries in terms of bandwidth, gain, field polarization, time-domain response, dimensions, and materials useful for their realization and integration in modern communication systems.

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19

İlarslan, Mustafa, A. Serdar Türk, Salih Demirel, M. Emre Aydemir, and A. Kenan Keskin. "A Compact Vivaldi Shaped Partially Dielectric Loaded TEM Horn Antenna for UWB Communication." International Journal of Antennas and Propagation 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/847169.

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Ultrawideband (UWB) antennas are of huge demand and Vivaldi antennas as well as the TEM horn antennas are good candidates for UWB applications as they both have relatively simple geometry and high gain over a wide bandwidth. The aim of this study is to design a compact antenna that achieves maximum gain over a bandwidth between 1.5 and 10.6 GHz while minimizing its size. The idea is to make use of combined respective advantages of Vivaldi and TEM horn antennas to achieve the desired goals by shaping the TEM horn antenna to look like a Vivaldi antenna. The antenna structure is modified by a dielectric load in the center to increase the gain bandwidth. It is placed in a surrounding box made of PEC material to reduce the undesired side lobes and to obtain more directive radiation pattern. The simulations are performed by using the CST STUDIO SUITE electromagnetic (EM) simulation software and they are later verified by the actual measurements. The Vivaldi shaped partially dielectric loaded (VS-PDL) TEM horn antenna is proposed as a compact UWB antenna for systems using the newly established UWB band and also for the communication systems of popular bands like ISM, Wi-Fi, and GSM.

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20

Sabila, Liya Yusrina, Denti Agustina Damayanti, and Teguh Prakoso. "Bandwidth Improvement on Rectangular Monopole Antenna using Dual Bevel Technique for Ultrawideband Technology." Mobile and Forensics 4, no. 1 (February 1, 2022): 1–10. http://dx.doi.org/10.12928/mf.v4i1.5496.

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This paper presents the analyzed Monopole Antenna for Ultrawideband with a rectangular patch design using bevel technique at a frequency of 3.1 – 10.6 GHz. The fabricated antennas with dual bevel angles have a very compact width and length of 40 mm x 33 mm respectively and a groundplane width of 13 mm. To get bandwidth improvement on monopole antennas can be applied to the bevel angle on the patch. So, to get the best antenna design, 3 optimizations of antenna size changes were carried out during the simulation, that is optimization of patch length, patch width and bevel angle. Variation of patch length and width is used to change the frequency range and variation of bevel angle to increase bandwidth. From each change, the best result is taken. The experiment obtained the best simulation result of antenna and then fabricate it. From the measurement results on the fabricated antenna, the lowest S11 value is -24.6 dB, gain 2.6 dBi at a frequency of 5 GHz and radiation pattern is omnidirectional. The optimization process using the bevel technique has been proven to be successful in shifting the frequency range by around 600 MHz and increasing the bandwidth by about 4% or 30 MHz.

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21

Sabila, Liya Yusrina, Denti Agustina Damayanti, and Teguh Prakoso. "Bandwidth Improvement on Rectangular Monopole Antenna using Dual Bevel Technique for Ultrawideband Technology." Mobile and Forensics 4, no. 1 (February 1, 2022): 1–10. http://dx.doi.org/10.12928/mf.v4i1.5496.

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This paper presents the analyzed Monopole Antenna for Ultrawideband with a rectangular patch design using bevel technique at a frequency of 3.1 – 10.6 GHz. The fabricated antennas with dual bevel angles have a very compact width and length of 40 mm x 33 mm respectively and a groundplane width of 13 mm. To get bandwidth improvement on monopole antennas can be applied to the bevel angle on the patch. So, to get the best antenna design, 3 optimizations of antenna size changes were carried out during the simulation, that is optimization of patch length, patch width and bevel angle. Variation of patch length and width is used to change the frequency range and variation of bevel angle to increase bandwidth. From each change, the best result is taken. The experiment obtained the best simulation result of antenna and then fabricate it. From the measurement results on the fabricated antenna, the lowest S11 value is -24.6 dB, gain 2.6 dBi at a frequency of 5 GHz and radiation pattern is omnidirectional. The optimization process using the bevel technique has been proven to be successful in shifting the frequency range by around 600 MHz and increasing the bandwidth by about 4% or 30 MHz.

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22

Sabila, Liya Yusrina, Denti Agustina Damayanti, and Teguh Prakoso. "Bandwidth Improvement on Rectangular Monopole Antenna using Dual Bevel Technique for Ultrawideband Technology." Mobile and Forensics 4, no. 1 (February 1, 2022): 1–10. http://dx.doi.org/10.12928/mf.v4i1.5496.

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This paper presents the analyzed Monopole Antenna for Ultrawideband with a rectangular patch design using bevel technique at a frequency of 3.1 – 10.6 GHz. The fabricated antennas with dual bevel angles have a very compact width and length of 40 mm x 33 mm respectively and a groundplane width of 13 mm. To get bandwidth improvement on monopole antennas can be applied to the bevel angle on the patch. So, to get the best antenna design, 3 optimizations of antenna size changes were carried out during the simulation, that is optimization of patch length, patch width and bevel angle. Variation of patch length and width is used to change the frequency range and variation of bevel angle to increase bandwidth. From each change, the best result is taken. The experiment obtained the best simulation result of antenna and then fabricate it. From the measurement results on the fabricated antenna, the lowest S11 value is -24.6 dB, gain 2.6 dBi at a frequency of 5 GHz and radiation pattern is omnidirectional. The optimization process using the bevel technique has been proven to be successful in shifting the frequency range by around 600 MHz and increasing the bandwidth by about 4% or 30 MHz.

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23

Chaudhary, Abhay. "Utilizing ultra-wideband with wireless telecommunications applications microstrip." International Journal of Advances in Applied Sciences 10, no. 4 (December 1, 2021): 283. http://dx.doi.org/10.11591/ijaas.v10.i4.pp283-287.

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<p>The small aspect, as well as low margins of the microstrip chip amplifier (MPA) is being used in a contact system. For the last few times within the last year's research, the majority of work with MPA has been centered towards designing the portable antenna design. Wireless networking systems may be fitted with a new ultrawideband digital monopoly antenna. Throughout this exponentially changing environment, and dual multi-standard antennas play a crucial role in the implementation of cell towers. This paper presents the nature of an ultra-wideband (UWB)-based antenna array for the shape of a substratum, feeding strategies or openings.</p>

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24

Duroc, Yvan, Tan-Phu Vuong, and Smail Tedjini. "A Time/Frequency Model of Ultrawideband Antennas." IEEE Transactions on Antennas and Propagation 55, no. 8 (August 2007): 2342–50. http://dx.doi.org/10.1109/tap.2007.901834.

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25

Duroc, Y., A. I. Najam, T. P. Vuong, and S. Tedjini. "Modeling and State Representation of Ultrawideband Antennas." IEEE Transactions on Antennas and Propagation 57, no. 9 (September 2009): 2781–84. http://dx.doi.org/10.1109/tap.2009.2027182.

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26

Mandal, Mrinal Kanti, and Zhi Ning Chen. "Compact Dual-Band and Ultrawideband Loop Antennas." IEEE Transactions on Antennas and Propagation 59, no. 8 (August 2011): 2774–79. http://dx.doi.org/10.1109/tap.2011.2158790.

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27

Koshelev, V. I., and V. V. Plisko. "Structure of arrays of ultrawideband combined antennas." Journal of Communications Technology and Electronics 62, no. 6 (June 2017): 565–68. http://dx.doi.org/10.1134/s1064226917050096.

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28

Qing, Xianming, Zhi Ning Chen, and Michael Yan Wah Chia. "Characterization of ultrawideband antennas using transfer functions." Radio Science 41, no. 1 (January 20, 2006): n/a. http://dx.doi.org/10.1029/2005rs003287.

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29

Dai, Li Hui, Chong Tan, and Yong Jin Zhou. "Ultrawideband Low-Profile and Miniaturized Spoof Plasmonic Vivaldi Antenna for Base Station." Applied Sciences 10, no. 7 (April 2, 2020): 2429. http://dx.doi.org/10.3390/app10072429.

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Stable radiation pattern, high gain, and miniaturization are necessary for the ultra-wideband antennas in the 2G/3G/4G/5G base station applications. Here, an ultrawideband and miniaturized spoof plasmonic antipodal Vivaldi antenna (AVA) is proposed, which is composed of the AVA and the loaded periodic grooves. The designed operating frequency band is from 1.8 GHz to 6 GHz, and the average gain is 7.24 dBi. Furthermore, the measured results show that the radiation patterns of the plasmonic AVA are stable. The measured results are in good agreement with the simulation results.

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30

Anumuthu, Priya, Kaja Sultan, Manavalan Saravanan, Mohd Ali, Manikandan Venkatesh, Mohammad Saleem, and Imaduddeen Nizamuddeen. "Design of Frequency Reconfigurable Patch Antenna for Sensing and Tracking Communications." Applied Computational Electromagnetics Society 35, no. 12 (February 15, 2021): 1532–38. http://dx.doi.org/10.47037/2020.aces.j.351212.

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This paper presents a front-end structure of a reconfigurable patch antenna for cognitive radio systems. The antenna structure consists of an Ultrawideband (UWB) sensing antenna and an array of frequency reconfigurable antennas incorporated on the same substrate. The UWB and reconfigurable antennas are fed by co-planar waveguides (CPW). The reconfigurability is achieved by rotating the series of patch antennas through a certain angle and the rotation is controlled by mechanical means using an Arduino microcontroller. The rotational reconfigurability has been preferred over MEMS switches, PIN diodes, and other lumped elements because the latter requires the need for bias lines. The entire structure is designed using High Frequency Structure Simulator (HFSS) software and the prototype is fabricated over FR-4 substrate having a thickness of 1.6mm and measurements are carried out. This antenna achieves a wideband frequency from 2 GHz to 12 GHz and distinct narrow band of frequencies by reconfigurability using single antenna consisting of different shapes spaced accurately to ensure isolation between adjacent frequency bands and each antenna element working for a bandwidth of 2 GHz for frequency from 2 GHz to 12 GHz upon a single substrate and the reconfigurable elements are controlled using a low cost Arduino microcontroller connected directly to the antenna which ensures accurate controlling of the rotation and fast switching between the antenna elements. The measured results agree with the simulated results and have less than 10 dB impedance bandwidth.

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31

Ling, Ching-Wei, Wen-Hsin Lo, Ran-Hong Yan, and Shyh-Jong Chung. "Planar Binomial Curved Monopole Antennas for Ultrawideband Communication." IEEE Transactions on Antennas and Propagation 55, no. 9 (September 2007): 2622–24. http://dx.doi.org/10.1109/tap.2007.904140.

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32

Yang, G. M., R. H. Jin, G. B. Xiao, C. Vittoria, V. G. Harris, and N. X. Sun. "Ultrawideband (UWB) Antennas With Multiresonant Split-Ring Loops." IEEE Transactions on Antennas and Propagation 57, no. 1 (January 2009): 256–60. http://dx.doi.org/10.1109/tap.2008.2009744.

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33

Ranga, Yogesh, Ladislau Matekovits, Karu P. Esselle, and Andrew R. Weily. "Multioctave Frequency Selective Surface Reflector for Ultrawideband Antennas." IEEE Antennas and Wireless Propagation Letters 10 (2011): 219–22. http://dx.doi.org/10.1109/lawp.2011.2130509.

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Schwarz, U., F. Thiel, F. Seifert, R. Stephan, and M. A. Hein. "Ultrawideband Antennas for Magnetic Resonance Imaging Navigator Techniques." IEEE Transactions on Antennas and Propagation 58, no. 6 (June 2010): 2107–12. http://dx.doi.org/10.1109/tap.2010.2046848.

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Tang, Ming-Chun, Ting Shi, and Richard W. Ziolkowski. "Planar Ultrawideband Antennas With Improved Realized Gain Performance." IEEE Transactions on Antennas and Propagation 64, no. 1 (January 2016): 61–69. http://dx.doi.org/10.1109/tap.2015.2503732.

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Shi, Yifei, Anthony K. Amert, and Keith W. Whites. "Miniaturization of Ultrawideband Monocone Antennas Using Dielectric Loading." IEEE Transactions on Antennas and Propagation 64, no. 2 (February 2016): 432–41. http://dx.doi.org/10.1109/tap.2015.2510663.

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Pepe, Domenico, Luigi Vallozzi, Hendrik Rogier, and Domenico Zito. "Design Variations on Planar Differential Antenna with Potential for Multiple, Wide, and Narrow Band Coverage." International Journal of Antennas and Propagation 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/478453.

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This paper presents three practical antenna implementations based on variations of one general planar differential antenna topology originally proposed for ultrawideband (UWB) applications. All designs were implemented on a low-cost FR4 substrate and experimentally characterized in an anechoic chamber. The results show how the proposed design variations lead to the required antenna performances and how they give rise to new opportunities in terms of coverage of wide, narrow, and multiple frequency bands for communication and sensing applications below 5 GHz. In particular, the results show how a significant enhancement in bandwidth performance is achieved by folding the differential radiating elements. Moreover, they show how an agile design strategy enables adaption of the antenna design to different requirements for covering wide, narrow, and multiple bands, making the proposed class of antennas suitable for different wireless applications. In detail, the proposed class of antennas covers multiple frequency bands, ranging from the 868 MHz and 915 MHz bands to 2.4 GHz industrial scientific and medical (ISM) bands, including the 1.2 GHz L band for Global Positioning and Navigation Satellite Systems (GNSS) and the lower portion of the UWB band.

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Simon, Jorge, Hugo Perez-Guerrero, Jorge Sosa-Pedroza, Fabiola Martínez-Zúñiga, Juvenal Villanueva-Maldonado, Jorge Flores-Troncoso, and Marco Cardenas-Juarez. "Design of an Ultrawideband Circularly Polarized Printed Crossed-Dipole Antenna Based on Genetic Algorithms for S-Band CubeSat Applications." International Journal of Antennas and Propagation 2021 (September 10, 2021): 1–13. http://dx.doi.org/10.1155/2021/8733427.

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As in any satellite, onboard antennas for CubeSats are crucial to establish communication with ground stations or other satellites. According to its application, antennas must comply with standardized requirements related to size, bandwidth, operating frequency, polarization, and gain. This paper presents an ultrawideband circularly polarized two-layer crossed-dipole microstrip antenna for S-band CubeSat applications using genetic algorithms optimization tools included in the 3D electromagnetic simulation software Ansys HFSS. The antenna is constructed on a 10 × 10 cm Cuclad-250 substrate with a back copper flat plane, located at λ/4 at 2.25 GHz operating frequency. The backplane with the exact substrate dimensions improves gain and reduces inside satellite radiation. Measured bandwidth defined by S11 at a −10 dB was higher than 1835 MHz with S11 = −24.68 dB at the central frequency of 2.25 GHz, while measured VSWR at the same frequency was 1.124. At 2.25 GHz, the maximum measured gain and the minimum measured axial ratio in the broadside direction were found to be 6 dBi and 0.22 dB, respectively. There are antenna simulations and measurements, as long as its fabrication guarantees application requirements that make it ready for prespace testing.

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Artner, Gerald, Philipp K. Gentner, Johann Nicolics, and Christoph F. Mecklenbräuker. "Carbon Fiber Reinforced Polymer with Shredded Fibers: Quasi-Isotropic Material Properties and Antenna Performance." International Journal of Antennas and Propagation 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/6152651.

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A carbon fiber reinforced polymer (CFRP) laminate, with the top layer consisting of shredded fibers, is proposed and manufactured. The shredded fibers are aligned randomly on the surface to achieve a more isotropic conductivity, as is desired in antenna applications. Moreover, fiber shreds can be recycled from carbon fiber composites. Conductivity, permittivity, and permeability are obtained with the Nicolson-Ross-Weir method from material samples measured inside rectangular waveguides in the frequency range of 4 to 6 GHz. The decrease in material anisotropy results in negligible influence on antennas. This is shown by measuring the proposed CFRP as ground plane material for both a narrowband wire monopole antenna for 5.9 GHz and an ultrawideband conical monopole antenna for 1–10 GHz. For comparison, all measurements are repeated with a twill-weave CFRP.

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B., Partibane, Gulam Nabi Alsath M., and Kalidoss Rajakani. "Design of a bandwidth enhanced hybrid slot loop antenna for GSM/UWB standards." Circuit World 43, no. 3 (August 7, 2017): 105–10. http://dx.doi.org/10.1108/cw-03-2017-0009.

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Purpose This paper aims to presents the bandwidth enhancement of a hybrid slot–loop antenna using a modified feed structure. Design/methodology/approach The conventional monopole feed of the hybrid slot–loop radiator is loaded with a flat microstrip patch to excite higher-order modes. The proposed antenna combines the resonant modes of the slot antenna, the loop antenna and the patch loading. Findings The antenna exhibits a dual-band response suitable for GSM 1800/1900 and ultrawideband (UWB) standards. The impedance bandwidth extends from 1.65 to 1.95 GHz (11.42 per cent) and 3 to 11.1 GHz (114.9 per cent). The proposed antenna has the smallest footprint with a peak gain of 5.07 dBi at 1.8 GHz and 4.97 dBi at 6 GHz. The prototype antenna is fabricated and the simulation results are validated using experimental measurements. The performance of the bandwidth-enhanced hybrid slot–loop antenna is compared with that of other slot antennas. Originality/value Thus, a hybrid slot–loop antenna with an enhanced bandwidth has been reported in this study. The conventional monopole feed of the antenna is replaced with a monopole ending with a microstrip patch load. The antenna covers the operating bands of GSM 1800/1900 and UWB. The proposed antenna has a smaller footprint compared with other wide-slot antennas reported in the literature.

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Adamiuk, Grzegorz, Mario Pauli, and Thomas Zwick. "Principle for the Realization of Dual-Orthogonal Linearly Polarized Antennas for UWB Technique." International Journal of Antennas and Propagation 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/231893.

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A concept of an array configuration for an ultrawideband suppression of the cross-polarization is presented. The method is explained in detail, and a mathematical description of the principle is given. It is shown that the presented configuration is convenient for the development of very broad band, dual-orthogonal, linearly polarized antennas with high polarization purity. The investigated configuration shows a high decoupling of the orthogonal ports and is capable for antennas with a main beam direction perpendicular to the substrate surface, that is, for a planar design. The phase center of the antenna configuration remains fixed at one single point over the complete desired frequency range, allowing a minimum dispersion of the radiated signal. The influence of nonidealities in the feeding network on the polarization purity is investigated. The presented method introduces a superior possibility of an extension of typical UWB technique to fully polarized systems, which improves significantly performance in, for example, UWB-MIMO or UWB-Radar.

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Khurshid, Adnan, Jian Dong, and Ronghua Shi. "A Metamaterial-Based Compact Planar Monopole Antenna for Wi-Fi and UWB Applications." Sensors 19, no. 24 (December 9, 2019): 5426. http://dx.doi.org/10.3390/s19245426.

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Ultrawideband (UWB) antennas are widely used as core devices in high-speed wireless communication. A novel compact UWB monopole antenna with an additional narrow band for Wi-Fi applications comprising a metamaterial (MTM) is proposed in this paper. The antenna has a compact size of 27 × 33 mm2 and consists of a V-shaped slot with two rectangular slots in the radiation patch. The inductance and capacitance develop due to the V-shaped slot in the radiation patch. The proposed antenna has −10 dB bandwidths of 3.2 GHz to 14 GHz for UWB and 2.38 GHz to 2.57 GHz for narrowband, corresponding to 144% and 7.66% fractional bandwidths, respectively. The measured gain and efficiency meet the desired values for UWB and Wi-Fi applications. To verify the performance of the antenna, the proposed antenna is fabricated and tested. The simulated and measured results agree well at UWB frequencies and Wi-Fi frequencies, and the antenna can be used as a smart device for portable IoT applications.

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Alex‐Amor, Antonio, Ángel Palomares‐Caballero, Javier Moreno‐Núñez, Adrián Tamayo‐Domínguez, Carmelo García‐García, and José M. Fernández‐González. "Ultrawideband inkjet‐printed monopole antennas for energy harvesting application." Microwave and Optical Technology Letters 63, no. 6 (February 2021): 1719–26. http://dx.doi.org/10.1002/mop.32803.

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Jafari, Hamed M., M. Jamal Deen, Steve Hranilovic, and Natalia K. Nikolova. "A Study of Ultrawideband Antennas for Near-Field Imaging." IEEE Transactions on Antennas and Propagation 55, no. 4 (April 2007): 1184–88. http://dx.doi.org/10.1109/tap.2007.893405.

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Zhang, Jin-Ping, Yun-Sheng Xu, and Wei-Dong Wang. "Microstrip-Fed Semi-Elliptical Dipole Antennas for Ultrawideband Communications." IEEE Transactions on Antennas and Propagation 56, no. 1 (January 2008): 241–44. http://dx.doi.org/10.1109/tap.2007.913165.

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Bharadwaj, Richa, Srijittra Swaisaenyakorn, Clive G. Parini, John Batchelor, and Akram Alomainy. "Localization of Wearable Ultrawideband Antennas for Motion Capture Applications." IEEE Antennas and Wireless Propagation Letters 13 (2014): 507–10. http://dx.doi.org/10.1109/lawp.2014.2309977.

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Mandal, Tapan, and Santanu Das. "Ultrawideband-printed hexagonal monopole antennas with WLAN band rejection." Microwave and Optical Technology Letters 54, no. 6 (March 20, 2012): 1520–25. http://dx.doi.org/10.1002/mop.26831.

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48

Ladhar, Lotfi, Mohamed Zarouan, Donia Oueslati, Jean-Marie Floch, and Hatem Rmili. "Investigation on cellular-automata irregular-fractal ultrawideband slot-antennas." Microwave and Optical Technology Letters 57, no. 11 (August 28, 2015): 2506–14. http://dx.doi.org/10.1002/mop.29367.

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49

Koshelev, V. I., and V. V. Plisko. "Arrays of combined antennas with equal-amplitude distribution of bipolar voltage pulses." Journal of Physics: Conference Series 2373, no. 7 (December 1, 2022): 072037. http://dx.doi.org/10.1088/1742-6596/2373/7/072037.

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Abstract The paper presents the comparative characteristics of the radiation pattern of the combined antenna arrays excited by a bipolar pulse and harmonic oscillations near the central frequency of the spectrum of ultrawideband radiation. Particular attention is paid to the 3x3 array radiation source with maximum efficiency.

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Isik, Gokmen, and Serkan Topaloglu. "A Compact Size 4–19.1 GHz Heart Shape UWB Antenna with Triangular Patches." International Journal of Antennas and Propagation 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/614754.

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An ultrawideband antenna is designed, simulated, and realized. To overcome the narrow bandwidth characteristics of basic patch antennas, the structure of the radiation pattern is optimized by the aid of elliptical and rectangular patches. Also triangular patches are applied to the antenna edge in order to enhance the VSWR and gain properties. A typical VSWR of 1.5 (less than 2 in the whole frequency range) and a typical gain of 2 dBi (mainly above 1 dBi in the whole frequency range) are observed. The simulations present that the designed antenna has a bandwidth ratio of ~5 : 1 within the frequency range of 4–19.1 GHz with compact dimensions of 25 × 26 mm2. It is fabricated on a 0.5 mm thick, RO3035 substrate. The input impedance, gain, and radiation characteristics of the antenna are also presented. With these properties, it is verified that, with its novel shape, the proposed antenna can be used for various UWB applications.

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