• Title/Summary/Keyword: Active Phased Array

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A study on the active phased array antennas with slotline coupling (슬롯라인 결합을 이용한 능동 위상배열안테나에 관한 연구)

  • Mun, Cheol;Kim, Seon-Taek;Yoon, Young-Joong;Park, Han-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.5
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    • pp.981-989
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    • 1997
  • In this paper, the 5-element active phased array antennas coupled through slotline between elements are designed and fabricated. A recent studies on the active phased array antennas using the transmission line coupling which can be designed to provide strong coupling and the appropriate coupling phase. But this sturucture has limitation of expanding in two dimensions for planar active phased array antennas and distortion of the radiation pattern caused by coupling network. Thus our work proposes the slotline coupling structure asthe broadband coupling network for the active phased array antenna. In experiment, 5-elements active phased array antenas have steering range from -30.deg. to 20.deg. off broadside as the free-running frequencies of end elements are controlled. The overall results show that the proposed slotline coupling structure is suited for the coupling network in the actie phased array antenna system. And the proposed coupling structire solves the expansion problem and eliminates the distortion of the radiation pattern caused by the spurious radiation of the transmission line coupling network. Thus thiscan be expanded to two dimensional coupling network for the planar active phased array antenna system.

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A phase calibration method of active phased array antennas for satellite communication

  • Noh, Haeng-Sook;Jeon, Soon-Ik;Chae, Jong-seock
    • Proceedings of the IEEK Conference
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    • 2002.07a
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    • pp.519-522
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    • 2002
  • An active phased array antenna consists of many channels. Each channel has a different initial phase shift and gain because of the inequality in the active circuits themselves, interface between radiators and active circuits, and beam-forming circuits and other antenna system configurations. This raises an inherent problem in active phased array antennas. To compensate for this problem the initial phase and gain of each channel should be calibrated. This paper presents an efficient calibration method for an initial phase variation of each channel in active phased array antennas. We tested our method in an active phased array antenna, and obtained good results in the radiation pattern and beam direction of antenna.

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The Characteristics of Wide-Band/Wide-Scan E-plane Notch Phased Array Antenna

  • Kim, Jun-Yeon;So, Joon-Ho;Lee, Moon-Que;Cheon, Chang-Yul
    • KIEE International Transactions on Electrophysics and Applications
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    • v.3C no.5
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    • pp.194-198
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    • 2003
  • A wide-band E-plane notch phased array antenna having bandwidths of 3:1 and a scan volume of $\pm$ 45 is designed considering the active element pattern (AEP) with analysis of the full structure of E-plane notch phased array antenna. Using the numerical E-plane waveguide simulator as an infinite linear array in the broadside angle, the active reflection coefficient (ARC) of the unit element is optimized in the design frequency range. To evaluate the convergence of the AEP, the simulation of full array as changing the number array is investigated, and the minimum numbers of array that have characteristics similar to the AEP of an infinite array are determined.

A Study on the Stabilized System Operation Considering the Reflection Characteristic of an Active-Phased Array Antenna (능동 위상 배열 안테나의 반사 특성을 고려한 안정적 시스템 운용에 관한 연구)

  • Kim, Young-Wan;Chae, Hee-Duck;Lee, Dong-Kook;Jeong, Myung-Deok;Park, Jong-Kuk
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.1
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    • pp.29-37
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    • 2012
  • In this paper, a stabilizd system operation through a composition of a protective circuit and an improvement of active reflection coefficient(ARC) is studied. Unlike the passive-phased array antenna, the APPA is a combined form of radiating element and transmitter-reciever module. Therefore, a definition of new ARC that differentiates itself from typical passive-phased array antenna must apply. The ARC is a reflection coefficient considering a superposition of a coupling from nearby radiating elements and self reflection. It is an important parameter that predicts and analyzes charateristics of a APPR system. A high level ARC is a direct source inducing a performance degradation of a system. In this paper, as a method for a stabilized operation of APAR, one method for improving a performance and another for degradation prevention are analyzed. An effectiveness of two methods was validated using experiment results of real-fabricated active-phased array antenna.

Expansion of Variable Range of Oscillation Frequency of Active Phased Array Antenna by a Varactor Diode (바랙터다이오드에 의한 능동 위상차 배열 안테나의 발진 주파수 가변 범위의 확장)

  • 최영규
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.11
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    • pp.521-528
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    • 2003
  • A varactor diode was utilized in order to expand variable range of the natural oscillation frequency of an active phased-array antenna. We have conformed experimentally that the variable range of the natural oscillation frequency was expanded about three times in the oscillator controlled by the varactor diode. When frequency difference was given to the oscillators in the two elements antenna system, phase difference was appeared between the oscillators. The 2-, 3-, 5-elements patch antenna array was composed for the beam scanning experiments. All the above patch antennas showed good phased array characteristics. The experimental results are as follows that the scanning angle of the 2-elements array antenna is 28.6$^{\circ}$, the 3-elements array antenna is 29.4$^{\circ}$, and the 5-elements array antenna is 26.2$^{\circ}$.

A Study on Fault Diagnosis for Planar Active Phased Array Antenna (평면 능동위상배열안테나 결함소자 진단방법에 관한 연구)

  • Jin-Woo Jung;Seung-Ho Kang
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.1
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    • pp.11-22
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    • 2023
  • A radiating elements fault diagnosis method with simplified radiation pattern measurement procedure was presented for planar active phased array antenna system. For presenting the mentioned method, the technique for linear approximation based on the radiation characteristics of a planar array configuration and a technique for solving a unique solution problem that occur in process of diagnosing a fault in a radiating elements were presented. Based on the presented method and a genetic algorithm, experimental simulations were performed for radiating element defect diagnosis according to various planar active phased array antenna configurations. As a result, it was confirmed that the presented radiating element fault diagnosis method can be smoothly applied to planar active phased antennas having various configurations.

Transmit-Beam Pattern Measurement of the Active Phased-Array Antenna Using Near-Field Measurement Facility (근접 전계 시험 시설을 이용한 능동 위상 배열 안테나 송신 빔 패턴 측정)

  • Chae, Hee-Duck;Kim, Han-Saeng;Lee, Dong-Kook;Jeong, Myung-Deuk;Park, Jong-Kuk
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.12
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    • pp.1155-1164
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    • 2011
  • In this paper, we proposed the transmit beam measurement method of active phased array antenna, which is installed in Korea's first developed naval medium range radar, using near-field measurement facility. The pulse-mode high power characteristics of active phased array antenna's trasmit-beam make it difficult to measure with general near-field measurement facilities where low power continuous RF signals are used. Thus, in this paper, the measurement method of active phased array antenna's transmit beam in conjunction with the near-field measurement facility, which is suitable for the high-power transmit beam measurement, and PNA-X network analyzer(Agilent Technologies), which can support pulse-mode measurement, was proposed and measured by near-field measurement techniques. And the EIRP(Effective Isotropic Radiated Power), the transmit characteristic of active phased array antenna, was measured by the near field measurement techniques and compared to numerical estimation which was nearly equal with small difference of 0.1 dB.

Ku band Linear Active phased Array Antenna Design and Fabrication (Ku 대역 선형 능동 위상 배열 안테나 설계 및 제작)

  • Ryu, Sung-Wook;Eom, Soon-Young;Kim, Nam
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.215-216
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    • 2006
  • In this paper, the antenna the with linear active phased array of $1{\times}16$ operated in DBS band was designed. The antenna was composed of sixteen radiating elements, sixteen active channels and five Wilkinson power combiners with 4-channel inputs, a digital control board and a stabilizing DC bias board. The radiating element of the array has the structure of a microstrip stack patch with a left-hand circular polarization. And, each active channel consists of a low noise ampilifier, a 3-bit digital phase shifter and a variable analog attenuator. The breadboard of linear active phased array antenna was also fabricated to test the electrical performances. The radiation patterns of the antenna were measured after correcting initial phases of each active channel in aechoic chamber. And also, the beam scanning chracteristcs of $10^{\circ}$, $20^{\circ}$, $30^{\circ}$ were measured.

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Study on TRX Channel Amplitude and Phase Calibration Method for a Radar Wind Profiler Based on 256 Active Phased Array (256 능동위상배열 기반 연직바람 관측장비의 송수신 채널 크기 및 위상 보정 방법 연구)

  • Jung, Woo-Jae;Lee, Jong-Chul
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.21 no.5
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    • pp.162-170
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    • 2022
  • In this paper, the phased-array transceiver (TRX) channel amplitude and phase calibration method for a radar wind profiler (RWP) based on the 256 active phased array is discussed. Without the additional module, the TX and RX calibration paths were secured using couplers and switches in the TRX front ends and the TRX switching duplexers, and the amplitude and phase of the 256 TRX were calibrated using a gain and phase detector. The beam widths and side lobes of five beams (vertical, east, west, south, and north) of the calibrated 256 active phased array antenna were confirmed by a near-field which agreed well with the simulation results. The proposed calibration method can be easily applied to a system based on an active phased array operated in an outdoor environment.

A Compact Active Channel Module Design for Active Phased Array Antenna System

  • Jung, Young-Bae
    • Journal of IKEEE
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    • v.17 no.4
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    • pp.393-397
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    • 2013
  • This paper introduces the T/RX combined compact active channel module which is a key unit of the active phased array antenna(APAA) system. This module is mainly compoased of two parts for TX and RX fabricated on both sides of the active module for size reduction. The TX-part is primarily composed of a 3-stage amplifier, a microstrip phase shifter, a thermal compensation and a power detection circuit. The RX-part is composed of LNAs a microstrip phase shifter and BPFs for TX power rejection. Using the proposed design structure we can realized a compact active channel module having high performance.