• Title, Summary, Keyword: UWB : Ultra Wide-Band

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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.

Performance of Double Binary Turbo Code for Ultra Wide-Band Systems with Multiple-Antenna Scheme (다중 안테나 개념을 적용한 초광대역 무선통신 시스템에서 이중 이진 터보 부호 성능)

  • Kim, Eun-Cheol;Cha, Jae-Sang;Lee, Chong-Hoon;Kang, Jeong-Jin;Kim, Seong-Kweon;Hwang, Sung-Ho;Kim, Jin-Young
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.9 no.2
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    • pp.117-122
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    • 2009
  • In this paper, the performance of double binary turbo code is analyzed and simulated in ultra wide-band (UWB) systems employing multiple-antenna scheme. We consider both pulse position modulation-time hopping (PPM-TH) and pulse amplitude modulation-direct sequence (PAM-DS) UWB systems. The space time block code (STBC) scheme is adopted as a transmit diversity method. Also, receive diversity scheme is applied. And double binary turbo code is applied to the UWB system.

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A Study on the RF performance analysis for Multi-band Ultra Wide Band Systems (멀티밴드 UWB 시스템의 무선성능 분석에 관한 연구)

  • Choi, Seok;Kim, Gil-Gyeom;Kwack, Jun-Ho;Kim, Hak-Sun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.12A
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    • pp.951-957
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    • 2003
  • The analysis of RF performance requirement conditions on communication system is critical indicator to predict the performance of system. UWB(Ultra Wide Band) system which the standard is not established yet is difficult to derive the precise system performance requirement condition. Also, there are differences between conventional UWB system and multi-band system about RF performance requirement condition. In this thesis, the differences are analyzed and performance requirement conditions of multi-band UWB system are described on the basis of the differences. Throughput, maximum transmit power, and sensitivity of multi-band UWB system is varied with respect to the number of Sub-Bands. In addition, because of Multi-path effect, if PRF(Pulse Repetition Frequency) is changed, the Multi-path link margin is happened to compensate for Multi-path Energy Loss which is contributed by increasing of the Link Margin. According to Multi-path Margin, the variation of the resistance with respect to sensitivity and interference signal is observed and analyzed through the simulation.

Optimal Design of a UWB-MIMO Antenna with a Wide Band Isolation using ES Algorithm (진화 전략 기법을 이용한 광대역 격리형 UWB-MIMO 안테나 최적설계)

  • Han, Jun-Hee;Kim, Hyeong-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.12
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    • pp.1661-1666
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    • 2014
  • In this paper, a compact planar ultra wideband (UWB, 3.1~10.6GHz) multiple-input multiple-output (MIMO) antenna is proposed. This antenna consists of two monopole planar UWB antennas and T-shaped stub decoupling between two antennas. The T-shaped stub improve the isolation characteristic at the wide band. The evolution strategy(ES) algorithm is employed to optimized design. As a result, optimized antenna has a return loss less than -10dB and the isolation less than -15dB from 3.1GHz to 10.6GHz. During the optimization process, the antenna gain is enhanced at lower band and the envelope correlation coefficient(ECC) is lower than 0.003.

Differential- Average Transmitted Reference Ultra Wide Band Communication System (Differential - Average Transmitted Reference Ultra Wide Band 통신 시스템)

  • Kim, Se-Kwon;Kim, Jae-Woon;Shin, Yo-An;Roh, Don-Suk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.1C
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    • pp.81-89
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    • 2009
  • We propose a D-ATR UWB (Differential-Average Transmitted Reference Ultra Wide Band) system based on impulse radio. The TR-UWB systems including traditional TR (Transmitted Reference) and ATR (Average TR), exhibit a problem of reduced data rate, since reference signals are additionally transmitted. To tackle this issue, the transmitter of the proposed D-ATR system employs a differential coding like the conventional D-TR system. In addition, the receiver of the proposed system has the structure that can improve signal-to-noise ratio of the reference template used in the correlation process, by recursively averaging the received reference signals like the conventional ATR system. The simulation results in the IEEE 802.15.4a UWB multipath channel models reveal that the proposed D-ATR system achieves much better bit error rate performance as compared to the conventional D- TR system.

Design of UWB Antenna for Ultra Wide-Band Communication Systems (UWB 통신을 위한 UWB 안테나 설계)

  • Choi, Seok-H.;Kim, Sun-K.;Park, Jong-K.;Kim, Hak-S.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.519-523
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    • 2003
  • In this paper, we proposed a new ultra wide-band(UWB) antenna for UWB communication applications. The proposed antenna is composed of a rectangular plate having two steps, single slot on plate and partial ground plane. This antennas operated from 3.2 to 13 GHz. Details of the proposed antenna design and measured results are presented discussed.

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Ultra Wide BandWireless Communications : A Tutorial

  • Di Benedetto , Maria-Gabriella;Vojcic, Branimir-R.
    • Journal of Communications and Networks
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    • v.5 no.4
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    • pp.290-302
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    • 2003
  • Ultra wide band (UWB) radio has recently attracted increased attention due to its expected unlicensed operation, and potential to provide very high data rates at relatively short ranges. In this article we briefly describe some main candidate multiple access and modulation schemes for UWB communications, followed with their power spectral density calculation and properties. We also present some illustrative capacity results, and provide a discussion of the impact of network topology on multiple access capacity.

Review on RF Performance of Ultra Wide Band Device

  • Lee, Il-Kyoo;Kang, Bub-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.2
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    • pp.34-39
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    • 2007
  • UWB(Ultra Wide Band) system for high speed and high accurate location has been studying actively. This paper presents the design and implementation of RF transceiver for DS-CDMA(Direct Sequence-Code Division Multiple Access) UWB device. Major components of RF transceiver such as Low Noise Amplifier(LNA) and Band Pass Filter(BPF) are designed and then fabricated to meet wideband characteristics. The RF transceiver was implemented by the use of the fabricated components and commercial devices after carrying out performance simulation. Through the performance evaluation of the UWB RF transceiver with W-CDMA signal, the approach of design, implementation and evaluation of RF transceiver which is available to DS-CDMA UWB system is verified.

Design and Implementation of CPW-Fed UWB Monopole Antenna (CPW 급전 방식을 이용한 UWB 모노폴 안테나 설계 및 구현)

  • Yu, Ju-Bong;Jeon, Jun-Ho;An, Chan-Kyu;Kim, Woo-Chan;Yang, Woon-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.2
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    • pp.218-223
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    • 2010
  • In this paper, a novel CPW(Coplanar Waveguide)-fed UWB(Ultra Wide Band) antenna is designed, implemented, and measured for UWB communications. CPW-fed planar antenna has advantages of wide-bandwidth, low-cost and easy interaction with radio frequency front end circuitry. We have used HFSS(High Frequency Structure Simulator) of Ansoft which is based on the FEM(Finite Element Method) to simulate the proposed antenna. FR-4 substrate of thickness 1.6 mm and relative permitivity 4.4 is used for implementation. The proposed antenna showed VSWR(Voltage Standarding Wave Ratio)${\leq}2$ for the frequency band from 3.1 GHz to 10.6 GHz which is used for ultra wide band communication. Measured peak gains are 2.61, 4.95, 2.89, 7.35 dBi at 3, 6, 8, 11 GHz, respectively.

Design of UWB Antenna with Fork-type structure and circular patch (원형 패치와 포크형 구조가 결합된 UWB 안테나)

  • Ha, Yun-Sang;Kim, Gi-Rae;Choi, Young-Kyu;Yun, Joong-Han
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.10
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    • pp.1837-1844
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    • 2016
  • This paper proposes an antenna of the fork type structure that operates in the UWB (Ultra Wide Band) frequency band (3.1 ~ 10.6 GHz). The proposed antenna is attached a circular patch in order to obtain the UWB band characteristics to the fork-type patch antenna. The ground plane is implemented in a arc-shape configuration. The effect of various parameters of the modified fork type radiating patch and partial arc ground plane for UWB operation is investigated. The proposed antenna is made of $34.0{\times}50.0{\times}1.0mm^3$ and is fabricated on the permittivity 4.4 FR-4 substrate. The experiment results shown that the proposed antenna obtained the -10 dB impedance bandwidth 8200 MHz (2.7 ~ 10.9 GHz) covering the UWB bands. This result satisfied the characteristics of ultra-wideband and the proposed antenna will be applicable to an ultra wideband system.