• Title/Summary/Keyword: branch-line hybrid coupler

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Flight Model Development of Linearized Channel Amplifier (선형화 채널 증폭기 비행모델 개발)

  • Hong, Sang-Pya;Go, Yeong-Mok;Yang, Ki-Dug;Ra, Keuk-Hwan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.8 no.3
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    • pp.83-90
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    • 2009
  • This paper presents the design and measurement of a flight model for a Ku-Band Linearized Channel Amplifier. All MMICs, Variable Gain Amplifier (VGA), Variable Voltage Attenuator ('.IVA), Branch line Coupler and Detector for Pre-distorter are fabricated using a Thin-Film Hybrid process. The performance of the fabricated module is verified through the radio frequency circuit simulation tool and electrical function test in space environment.

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Design of a New Balanced Power Amplifier Utilizing the Reflected Input Power (입력단 반사전력을 이용하는 새로운 구조의 평형전력증폭기 설계)

  • Park, Chun-Seon;Lim, Jong-Sik;Cha, Hyeon-Won;Han, Sang-Min;Ahn, Dal
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.5
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    • pp.947-954
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    • 2009
  • This paper proposed a new balanced power amplifier using the reflected input of conventional balanced power amplifiers composed of branch line hybrid coupler. In general, the single-ended amplifier in balanced amplifiers does not have the perfect matching, so the reflected input power, in other words the leakage power, is terminated conventionally at the isolation port of hybrid coupler. However in this work, the leakage power is injected into the auxiliary amplifier, and its output power is combined to the output power of balanced amplifier. Therefore output power, efficiency, and 2-tone IMD3 performances of the proposed balanced amplifier are highly improved compared to the conventional balanced amplifier. For the verification of the proposed balanced amplifier, a conventional balanced amplifier and the proposed balanced amplifier are designed, fabricated and measured, and the measured results are compared. The proposed balanced amplifier shows the improvement in the output power(Pout), power added efficiency (PAE), and 2-tone IMD3 by 3dB, 5.2%, and $5{\sim}10dBc$, respectively, from the measurement.

A Study on the Taegeuk Shaped Directional Coupler with Improved Power Split Ratio (개선된 전력 분배율을 갖는 태극형 방향성 결합기에 관한 연구)

  • 양규식;오양현;이종악
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.2 no.2
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    • pp.19-24
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    • 1991
  • This paper propose a new taegeuk shaped directional couper and verify the possibility of high power division rate in those directional coupler through the experiments. We took the taegeuk shaped structure in those proposed directional coupler to utilize a $3\lambda/4$ section of hybrid ring directional coupler actively, and calculated the branch admittances, which satisfied the condition of perfect matching and isolation in the center frequency, by even odd mode analyzing methodes. On the result, we knew that it can be realized a much higher power division rate than reported result in same circuit area within the producible resistance limit in the microstrip line, made the taegeuk shaped directional couplers with 0, 8, 16 dB power split ratio in the 10 GHz frequency using CGP - 502 plate, and confirmed the validity of theory through the experiments.

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Analysis of PSK Coherent Carrier Signal Recovery Circuit Using Six-Port Phase Correlator (6-단자 위상 상관기를 이용한 PSK 반송파 신호 복원 회로 해석)

  • Kim, Young-Wan;Shin, Choo-Yeon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.11
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    • pp.1281-1286
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    • 2008
  • The PSK carrier signal recovery circuit using a six-port phase correlator was analyzed and the circuit structure is proposed in this paper. The proposed carrier signal recovery circuit that is made of reflection element and six-port phase correlator, which is comprised of a power divider and three hybrid branch line couplers, give a simple structure and can be fabricated without no difficulty. The circuit recovers the carrier signal of BPSK and QPSK modulation signal. The proposed scheme can be utilized as a basis structure for high-mode PSK carrier signal recovery. By simulation results, the recovered signal by the proposed circuit shows a good carrier signal characteristic with CW signal of a constant phase($23.4^{\circ}$) and ${\pm}0.8^{\circ}$ phase error due to glitch conditions.

Design of a Branch Line Hybrid Coupler Using a Common DGS Structure (공통 결함접지구조를 이용한 브랜치 라인 하이브리드 설계)

  • Lee, Jae-Hoon;Lee, Jun;Kim, Bo-Kyun;Lim, Jong-Sik;Ahn, Dal
    • Proceedings of the KAIS Fall Conference
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    • 2010.11a
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    • pp.85-87
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    • 2010
  • 본 논문에서는 공통 결함접지구조를 이용하여 브랜치 라인 하이브리드 커플러 회로를 소형화하여 설계한 결과를 제시한다. 브랜치 라인 하이브리드 커플러 회로는 가장 널리 쓰이는 전자파회로중 하나이다. 본 논문에서 제안하는 공통 결함접지구조를 이용하여 소형화한 커플러 회로는 크기가 소형화되었음에도 불구하고, 기존 커플러 구조와 유사한 정합, 격리 및 전력분배 특성을 보여준다.

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Development of a New Active Phase Shifter

  • Kim, S.J.;N.H. Myung
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.1063-1066
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    • 2000
  • ln this paper, a new active phase shifter is proposed using a vector sum method, and it is shown that the proposed phase shifter is more efficient than the others in size, power, number of circuits, and gain. Also a unique digital phase control method of the circuit is suggested. The proposed scheme was designed and implemented using a Wilkinson power combiner/divider, a branch line 3dB quadrature hybrid coupler and variable gain amplifiers (VGAs) using dual gate FETs (DGFETs). Furthermore, it is also shown that the proposed scheme is more efficient and works properly with the digital phase control method.

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Design and Implementation of Reactive Circuit for Ferroelectric Phase Shifter (강유전체 위상 변위기를 위한 Reactive Circuit 설계 및 구현)

  • Kim Young-Tae;Moon Seung-Eon;Lee Su-Jae;Kim Sun-Hyeong;Park Jun-Seok;Cho Hong-Goo
    • 한국정보통신설비학회:학술대회논문집
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    • 2003.08a
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    • pp.286-288
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    • 2003
  • In this paper, in order to obtain a large differential phase shift with a little change in applied voltage, a ferroelectric reflective load circuit has been designed on top of barium strontium titanate $(Ba,Sr)TiO_3$ [BST] thin film. The design of the ferroelectric reflection-type phase shifter is based on a reflection theory of terminating circuit, which has a reflection-type analogue phase shifter with two ports terminated in symmetric phase-controllable reflective networks. To achieve large amounts of phase shift in low bias-voltage range, the effects of change of capacitance and transmission line connected with two coupled ports of a 3-dB $90^{\circ}$ branch-line hybrid coupler have been investigated. A large phase shift with a small capacitance change in the parallel terminating circuit has been demonstrated in the paper.

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Phase shitter design and implementation of DGS using ferroelectric materials (강유전체를 이용한 DGS 구조의 위상 변위기 설계 및 구현)

  • Kim, Young-Ju;Park, Jun-Seok;Kim, Young-Tae;Kim, Sun-Hyeong;Kim, Hyeong-Seok
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.2014-2016
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    • 2004
  • In order to obtain a low-loss ferroelectric phase shifter, the reflection-type phase shifter with ferroelectric defected ground structure (DGS) resonators has been designed in this paper. The proposed phase shifter is consist of a 3-dB $90^{\circ}$ branch-line hybrid coupler and terminated reflective circuit with tunable ferroelectric DGS resonator. The ferroelectric DGS unit structure can provide high Q resonator characteristic at high frequencies. The design parameters of equivalent circuit for the tunable DGS resonator are derived by using simple circuit analysis method and three-dimensional full wave finite element method. The fabricated phase shifter has an insertion loss of better than 3.4dB at 13.5GHz.

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