• Title, Summary, Keyword: UWB antennas

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Development of Ultra-Wideband Antennas

  • Chen, Zhi Ning
    • Journal of electromagnetic engineering and science
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    • v.13 no.2
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    • pp.63-72
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    • 2013
  • The ultra-wideband (UWB) spectrum available for commercial applications has offered us an opportunity to achieve high-speed wireless communications and high-accuracy location applications. As one of key research areas in UWB technology, a lot of innovative broadband and miniaturization techniques for UWB antennas have been greatly invented and developed for years. This paper reviews the development of UWB antenna design in the past decade. Starting with a brief introduction of the specific requirements and promising applications of UWB systems, the unique design challenges of UWB antennas are highlighted. Next, the important milestones of UWB antenna designs are briefed. After that, a variety of planar UWB antennas invented for broadband operation, miniaturization, and multiple functions are introduced. Last, the comments on the development of UWB antennas in future are shared.

Characterization and Analysis of UWB Antennas in Time Domain (시간 영역에서의 초광대역 안테나 특성 해석)

  • Song Jong-Hwa;Park Young-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.3
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    • pp.287-294
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    • 2006
  • In the paper, characterization and analysis of UWB(Ultra Wide Band) antennas in time domain are described. The impulse propagation channel including UWB antennas is proposed for the analysis in time domain. Using the proposed propagation channel, the technique of obtaining impulse response of UWB antenna is proposed. Also, ringing, peak value of the impulse response, and the width of the impulse response are introduced as parameters for characterizing a UWB antenna in time domain. A modified UWB conical monopole antenna, a UWB TEM horn antenna, and a UWB stepped fat monopole antenna were fabricated. From the measurement of reflection coefficients, three antennas had bandwidth more than 3 GHz. The impulse responses of the antennas were measured in an anechoic chamber. The results showed that the TEM horn with highest gain has the highest peak amplitude and the stepped fat monopole antenna with narrowest bandwidth for reflection coeffcient had the widest width of the impulse response. Also, ringing in the stepped fat monopole antennas and the UWB conical monopole antenna were observed.

Design Optimization of an Enhanced Stop-band UWB Bow-Tie Antenna

  • Choi, Kyung;Kim, Hyeong-Seok;Hwang, Hee-Yong
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.793-799
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    • 2018
  • An improved design of Ultra Wide Band(UWB) Bow-Tie antenna, which can control an enhanced wide stop-band, is presented. The mutually coupled slot-pair improves and controls the rejection band. The UWB antenna is composed of an electromagnetically coupled Bow-Tie patch and a parasitic ground patch, whose working frequency is extended to full UWB range in this work. By adding slot-pairs on the main patch and optimizing, they can give any requested wide rejection bands and sharp skirt characteristics, as is often required for UWB antennas and multi-band antennas. All the parameters are precisely calculated by an adequate optimization method. The Particle Swarm Optimization(PSO) technique is appropriately adopted. The proposed design and method is proved to give and control the sharp-skirt wide stop-band to UWB Bow-Tie antennas.

Band-Rejected UWB Antenna Using Unit Cells of FSS (FSS 단위 셀을 이용한 대역저지 UWB 안테나)

  • Lee, Chang Yong;Jung, Chang Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.7
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    • pp.3431-3436
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    • 2013
  • Band-notched ultra-wideband (UWB) antennas using frequency selective surfaces (FSSs) are presented. The proposed antennas utilized the band rejection characteristic of typical FSS unit cells. We loaded the FSS unit cells on the same plane of planar UWB antenna. These antennas are designed to reject the interference from the wireless local area network band, 5.15-5.825 GHz in the UWB band, 3.1-10.6 GHz. The measured peak gains of the proposed antennas are more than 2 dBi at both operation edge and center frequencies, and sufficient to apply for commercial purpose. The antennas are small size and planar shape for the purpose of the small mobile application, and enhanced design freedom by using various existing FSS unit cells.

Design and Implementation of UWB Antennas for Wireless Video Transceiver Handset (무선 영상 송수신 단말기용 UWB 안테나 설계 및 구현)

  • Lee, Sung-Ock;Chae, Jeong-Sik;Jung, Hoe-Kyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.4
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    • pp.686-691
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    • 2012
  • Deviating from the exclusive frequency assignment, UWB has utilized much wider frequency range, worked independently without interfering other frequencies, and simultaneously enabled to increase more than hundreds of Mbps data transmission rate. In considering its high data rate and no interference, UWB certainly has an infinite and technical potential. In this paper, we studied the UWB technology as well as its technological trend, analyzed UWB antenna, and actualized a small antenna for wireless video streaming devices.

A planar half-disk UWB antennas having a notch function (노치 기능을 가지는 반원 형태의 UWB 안테나)

  • Lee, Hyo-K.;Jang, Mi-H.;Lee, Yoon-J.;Park, Jong-K.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.205-210
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    • 2005
  • In this paper, a planar half-circle shape ultra-wideband(UWB) antenna fed by CPW is designed, fabricated and measured for UWB communications. Within the UWB band(3.1 GHz $\sim$ 10.6 GHz), 5.15 GHz $\sim$ 5.825 GHz frequency band is used by IEEE 802.lla WLAN applications. It may be necessary to notch out this band to avoid interference with IEEE 802.lla WLAN. Therefore, we have proposed three kinds of UWB antennas having a notch function, such as a rectangular slot, a hat-shaped slot, a circle-shaped slot. The notch frequency of the proposed antenna can be adjusted by controlling the slot length or slot width. From the measured results, the proposed antennas show a good gain flatness except the IEEE 802.lla WLAN frequency band and have a reasonable agreement with simulated results.

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Receiver Techniques for Ultra-wide-band Multiuser Systems over Fading Multipath Channels

  • Zhou, Xiaobo;Wang, Xiaodong
    • Journal of Communications and Networks
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    • v.5 no.2
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    • pp.167-173
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    • 2003
  • We treat the problem of channel estimation and interference cancellation in multiuser ultra-wide-band (UWB) communication systems over multipath fading channels. The UWB system under consideration employs a random time-hopping impulse radio format. We develop a channel estimation method based on linear weighted algorithm. An iterative channel estimation and interference cancellation scheme is proposed to successively improve the receiver performance. We also consider systems employing multiple transmit and/or receive antennas. For systems with multiple receive antennas, we develop a diversity receiver for the wellseparated antennas. For systems with multiple transmit antennas, we propose to make use of Alamouti’s space-time transmission scheme, and develop the corresponding channel estimation and interference cancellation receiver techniques. Simulation results are provided to demonstrate the performance of various UWB receiver techniques developed in this paper.

Performance Analysis of a UWB System with MIMO Antennas in Indoor Channel Environments (실내 환경의 채널에서 MIMO 안테나로 구성된 UWB 시스템의 성능 분석)

  • Kim Su-Nam;Kang Dong-Wook;Kim Ki-Doo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.11C
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    • pp.1564-1572
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    • 2004
  • UWB(Ultra Wide Band) under standardization for WPAN has a restriction in transmitting power because of interference with existing systems. To overcome the restriction, in this paper, we construct the MIMO(Multi-input-Multi-Output) channel using multi-transmit/receiver antennas and analyze the performance of the proposed system. In addition, through numerical simulation, we obtain the interference property among these antennas and analyze the effect of an interference to the system. The proposed UWB system has a ML detector and the least square method will be used to cancel the multi-user interference and the inter symbol interference caused by multipath.

Performance of UWB Systems using Spatial Diversity in Multi-User Environments (다중사용자 환경에서 공간적인 다이버시티를 이용하는 초광대역 통신시스템의 성능 비교분석)

  • Baek, Sun-Young;An, Jin-Young;Lee, Sung-Sin;Kim, Sang-Choon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.11
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    • pp.2121-2126
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    • 2007
  • In this paper, the performance improvement of ultra-wideband(UWB) communications system to achieve high-data-rate using spatial diversity provided by multiple receive antennas is investigated. We derive the expression for the received SINR after spatially combining through multiple receive antennas and evaluate the bit error rate(BER) performance by numerical simulation. We also compare the performance results in the case of 2PPM systems with the theoretical performance results in the case of 2PAM THMA UWB systems. The impacts of spatial diversity on the performance of 2PPM and 2PAM THMA UWB systems are analyzed. It is shown that the BER performance is improved as the number of receive antennas increases. Also, it is observed that in the presence of multiple user interference signals, the performance of 2PAM THMA UWB systems is considerably superior to that of 2PPM THMA UWB systems.

Performance of UWB Systems using Spatial Diversity in Multi-User Environments (다중사용자 환경에서 공간적인 다이버시티를 이용하는 초광대역 통신시스템의 성능 비교분석)

  • Baek, Sun-Young;An, Jin-Young;Lee, Sung-Sin;Kim, Sang-Choon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.321-324
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    • 2007
  • In this paper, the performance improvement of ultra-wideband (UWB) communications system to achieve high-data-rate using spatial diversity provided by multiple receive antennas is investigated. We derive the expression for the received SINR after spatially combining through multiple receive antennas and evaluate the bit error rate (BER) performance by numerical simulation. We also compare the performance results in the case of 2PPM systems with the theoretical performance results in the case of 2PAM THMA UWB systems. The impacts of spatial diversity on the performance of 2PPM and 2PAM THMA UWB systems are analyzed. It is shown that the BER performance is improved as the number of receive antennas increases. Also, it is observed that in the presence of multiple user interference signals, the performance of 2PAM THMA UWB systems is considerably superior to that of 2PPM THMA UWB systems.

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