• Title/Summary/Keyword: 역지향성 배열

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Design of a Retrodirective Active Array Antenna in the LS band (LS밴드 역지향성 능동배열 안테나의 제작)

  • Chun, Joong-Chang;Kim, Tae-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.689-692
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    • 2005
  • In this paper, we have developed a retrodirective active array operating in the 2 GHz LS band. The retrodirective array has the property of re-directing any electromagnetic wave back to the incoming direction without any priory informations. The system is consisted of frequency mixers and antenna array. The mixer is acting as a phase conjugator. In this research, 2-port gate mixers using pHEMT and 1${\times}$4 monopole array have been used. The retrodirective array developed in this research can be applied in the base station facilities for the wireless mobile communications and RFID transponders.

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Design of a Retrodirective Active Array Antenna for the LS Band (LS 밴드용 역지향성 능동배열 안테나 설계)

  • Chun Joong-Chang
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.1
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    • pp.171-175
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    • 2006
  • In this paper, we have developed a retrodirective active array operating in the 2 GHz LS band. The retrodirective array has the property of redirecting any electromagnetic wave back to the incoming direction without any priory informations. The system is integrated with phase conjugators and antenna array. Microwave phase conjugators can be implemented by microwave mixers. In this research, 2-port gate mixers using pHEMT and $1{\times}4$ monopole array have been used to achieve the retrodirectivity. The measured results have been compared with the theoretical prediction, and it has been shown that there exists a reasonable agreement between them. The monopole array can be used easily in many areas for simplicity and cost-effective property, and the retrodirective array developed in this research can be applied directly in the base station facilities for the wireless mobile communications. indoor wireless LAN and RFID transponders.

Design of a 2-Port Frequency Mixer for the Retrodirective Active Array Antenna (역지향성 능동배열 안테나용 2-Port 주파수 혼합기의 설계)

  • 전중창;김태수;김현덕
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2004.05b
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    • pp.59-63
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    • 2004
  • In this paper, we have developed a 2-port resistive frequency mixer for the retrodirective active array. The circuit topology is consisted of 2-port to avoid the complexity of LO and RF signal combination, using a pseudomorphic HEMT device. The operating frequencies are 4.0 GHz, 2.01 GHz, and 1.99 GHz for LO, RF, and IF, respectively. Conversion loss is measured to be -1㏈ and 1-㏈ compression point -15 ㏈m at the LO power of -10 ㏈m.

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Design of a 2-Port Frequency Mixer for Active Retrodirective Array Applications (역지향성 능동배열 안테나용 2-Port 주파수 혼합기의 설계)

  • Chun Joong-Chang;Kim Tae-Soo;Kim Hyun-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.2
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    • pp.397-401
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    • 2005
  • In this paper, we have developed a frequency mixer which can be used as a microwave phase conjugator in the retrodirective array antenna. The retrodirective array, which can reflect the incident wave retrodirertively back to the source direction without any priori information, requires phase conjugators to achieve the phase change of 180 degrees for the incoming signal. frequency mixers can efficiently serve as phase conjugators. The circuit topology is of the 2-port structure to avoid the complexity of LO and Rf signal combination and matching circuits, using a pseudomorphic HEU device. The operating frequencies are 4.0 CHz, 2.01 CHz, and 1.99 CHz for LO, RF, and If signals, respectively. Conversion loss is measured to be -ldB and 1-dB compression point -l5 dBm at the LO power of -10 dBm.

System Design and Evaluation of Digital Retrodirective Array Antenna for High Speed Tracking Performance (고속 추적 특성을 위한 디지털 역지향성 배열 안테나 시스템 설계와 특성 평가)

  • Kim, So-Ra;Ryu, Heung-Gyun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.8
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    • pp.623-628
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    • 2013
  • The retrodirective array antenna system is operated faster than existing techniques of beamforming due to its less complexity. Therefore, it is effective for beam tracking in the environment of fast vehicle. On the other hand, it also has difficulty in estimating AOA according to multipath environment or multiuser signals. To improve the certainty of estimating AOA), this article proposes hybrid digital retrodirective array antenna systme combined with MUSIC algorithm. In this paper, the digital retrodirective array antenna system is designed according to the number of antenna array by using only one digital PLL which finds angle of delayed phase. And we evaluate the performance of the digital retrodirective array antenna for the high speed tracking application. Performance is studied by simulink when the speed of mobile is 300km/h and the distance between transmitter and receiver is 100m and then we have to confirm the performance of the system in multi path environment. As a result, the mean of AOA (Angle Of Arrival) error is $4.2^{\circ}$ when SNR is 10dB and it is $1.3^{\circ}$ when SNR is 20dB. Consequently, the digital RDA shows very good performance for high speed tracking due to the simple calculation and realization.

Phase Tracking Settling Time and BER Performance Evaluation in the Digital Retrodirective Array Antenna System (디지털 역지향성 배열 안테나 시스템에서 위상 추적 Settling 시간과 BER 성능 평가)

  • Kim, So-Ra;Lee, Seung Hwan;Shin, Dong Jin;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.1
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    • pp.55-63
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    • 2013
  • Digital retrodirective antenna system is easy to modify and upgrade because it can control the phase information of the output signal toward opposite direction to input signal without a priori knowledge of the arrival direction. Due to this advantage, it is possible to do fast beam tracking. Especially, we need to design the digital PLL performance for the digital retrodirective array antenna system. So, in this paper the settling time of phase estimator and BER performance of retrodirective antenna system are investigated according to design of filter in digital PLL. When QAM signal is used for 1 Mbps with $30^{\circ}$ of phase delay, simulation results show that digital phase conjugation technique has better BER performance by about 1 dB than non-phase conjugation system when digital filter is stable. If not, the system can't estimate the exact phase because of oscillation of filter.

The Communication Security Improvement Technology Using Chaos Modulation and Retrodirective Array Antenna (카오스 변조와 역지향성 안테나를 이용한 통신 보안 향상 기법)

  • Bok, Junyeong;Kim, Gi-Young;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.4
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    • pp.410-416
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    • 2013
  • In this paper, we propose a chaotic correlation delay shift keying(CDSK) using digital retrodirective array antenna (RDA) for improving security and receive performance. Chaotic signals provide improved security due to non-periodic and non-predictable performance of chaotic signals. However, the receive performance of these chaotic signals is degraded due to self-interference and interference signals. Therefore, this paper, we analyze the receive BER performance of chaos communication system which has digital RDA based on CDSK modulation schemes for improving security without receive performance degradation. Simulation results show that the proposed system can get the same receiving performance compared to BPSK modulation schemes when array elements of RDA are 5.

Phase Conjugator for Retrodirective Array Antenna Applications (능동 역지향성 배열 안테나용 공액 위상변위기)

  • Chun Joong-Chang;Jeung Deuk-Soo;Lee Byung-Rho;Tack Han-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.2 s.93
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    • pp.134-138
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    • 2005
  • In this paper, we have developed a new type of the microwave phase conjugator for the active retrodirective antenna array. The circuit topology is consisted of a 2-port structure to avoid the complexity of LO and RF signal combination and matching, using the cascade connection of two single-ended mixers. The operating frequencies are 4.0 GHz, 2.01 GHz and 1.99 GHz for LO, RF, and IF, respectively. Conversion loss is measured to be -7 dB and 1-dB compression point 15 dBm with the LO power of 9 dBm. For the most important parameter, the isolation between RE leakage and IF signal is as high as 25 dB.

Study on Retrodirective Cross-eye Structure using Linear Phased Array Antenna (선형 위상배열 안테나를 이용한 역지향성 크로스아이 구조에 관한 연구)

  • Kim, In-seon;Park, Jintae;Kim, Ghiback;Park, Beomjun;Jang, Yeonsoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.1
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    • pp.11-17
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    • 2020
  • This study proposes a novel structure for the cross-eye, one of the representative jamming techniques of monopulse sensors. The proposed jammer tranceivers are composed of multi-channels with phased array antenna. We named this structure PRCJ(Phased array Retrodicetive Cross-eye Jammer). In this structure, formulas for calculating cross-eye gain and distance error are derived. We compare the properties of PRCJ with two-element retrodiredtive cross-eye jammer(TRCJ). PRCJ can achieve higher J/S because this structure can steer the spatially combined jamming signal in the direction of the incident monopulse signal. Because of the multiple channels in the phased array, it also increases the degree of freedom of channel matching. Finally, We preform a statistical analysis of the cross-eye gain according to the amplitude and phase errors. From this results, It has been found that PRCJ can get higher cross-eye gain than TRCJ.

Design and BER Performance Evaluation for Digital Retrodirective Array Antenna systems (디지털 역 지향성 배열 안테나 시스템 설계와 성능 평가)

  • Kim, So-Ra;Lee, Seug Hwan;Shin, Dong Jin;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.3
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    • pp.217-223
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    • 2013
  • A digital retrodirective antenna system is easy to modify and upgrade because it can control the phase information of the output signal toward opposite direction to input signal without a priori knowledge of the arrival direction. Due to this advantage, it is possible to perform fast beam tracking. In this paper, a design digital retrosirective array antenna system according to the number of antenna array by using only one digital PLL which finds angle of delayed phase and we test BER performance of this system. When we transmit data at actual communication system, the data modulated onto carrier frequency in order to shift spectrum from base band to another band. So we simulate system considering carrier frequency according to the number of antenna array. As a result, carrier frequency has no impact on the performance.