• Title, Summary, Keyword: 반사형 가변 위상기

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Design of the Broad Band Phase Shifter for DTV Receiver (DTV(Digital TV) 수신 모듈용 광대역 가변 위상기의 설계)

  • 한기진;김종필;나형기
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.3
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    • pp.296-303
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    • 2003
  • In this paper, a design method is proposed for the reflection type phase shifter applied to the DTV(Digital TV) receiver, and a phase shifter is designed by using the design equations to satisfy the phase shifting range over 180 degrees for frequency range from 470 MHz to 860 MHz, the receiving band of DTV. From the proposed method, it is possible that the systematic design of the reflection type phase shifter with desired phase shifting range and insertion loss. In addition, it is found that the realized phase shifter satisfies the given specifications.

A Study on the Reflection Type Analog Phase Shifter using Varactor and Branch Coupler (가변 캐패시터와 Branch Coupler를 이용한 반사형 아날로그 위상 변위기 연구)

  • 유강희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.3A
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    • pp.311-317
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    • 2004
  • A low loss reflection type analog phase shifter which is realized with two varactors and branch coupler. is described. A new design technique for the large phase shift is applied using short stub microstripe lines. This paper presented the realization of design and experimental results. Through the experiment using the duroid microstrip line and varactors, the phase of 2.26GHz signal is controlled to the DC voltage with the phase shift range of 170$^{\circ}$. The achieved insertion loss of less than 3㏈ and the return loss of mote than 12㏈ are achieved over all phase states.

A $\pi$-type Variable Attenuator with Low Phase Shift (저위상 변화 특성을 갖는 $\pi$-형 가변 감쇠기)

  • Park, Ung-Hee;Ahn, Gil-Cho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.10
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    • pp.2066-2070
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    • 2009
  • A voltage controlled attenuator using a PIN diode and two resistors of the $\pi$-type fixed attenuator is described in this paper. The proposed variable attenuator operating for a fixed attenuation range has a good input VSWR and a low intermodulation signal. For the low phase shift, a PIN diode is connected with open stub for the purpose of phase compensation. The stub for phase compensation is calculated by the Deloach method and the related circuit theory. This attenuator is easily fabricated on the microstrip and can be normally used in fine control circuits within small attenuation range. The fabricated attenuator for 2110~2170 MHz frequency band has about 4 dB of an attenuation range, $2^{\circ}$ of phase variance, and -20 dB of S11 according to the input voltage from 0 to 2.7 V.

The Design of IQ Vector Modulator having AGC Function for IMT-2000 (AGC 기능을 갖춘 IMT-2000용 IQ 벡터 모듈레이터 설계)

  • 오인열;박종화;손광철;김태웅;전형준;나극환
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.6
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    • pp.575-583
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    • 2003
  • In thesis we applied the short or open reflection type for IQ vector modulator The open or short type is operated even exception of other redundancy circuit. Generally IQ vector modulator uses MESFET in performing reflection open or short, then minus voltage which is having complex structure is required to operate MESFET via IQ signal. However BJT can be substituted for MESFET, BJT is improved characteristics like as cutoff frequency, electron mobility and so on. We used BJT in IQ vector modulator which is compatible with TTL level in I,Q digital signal, and attached AGC function. We got the result of operations within ${\pm}$ 1$^{\circ}$ phase and ${\pm}$ 0.6 dB amplitude Variation With full range of 20 dB and Variation of ${\pm}$ 6$^{\circ}$ Phase and ${\pm}$ 0.5 dB amplitude Versus full temperature range.

Design and fabrication of Ka-Band Analog Phase Shifter using GaAs Hyperabrupt Junction Varactor Diodes and Reactance Matching (GaAs Hyperabrupt Junction 바랙터 다이오드와 리액턴스 정합을 이용한 Ka-Band 아날로그 위상변화기의 설계)

  • ;Seong-Ik Cho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.5
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    • pp.521-526
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    • 2003
  • This paper describes performance data and design information on a reflection-type analog phase shifter used in Ka-band. Arranging a couple of GaAs hyperabrupt junction varactor diode parallel in a circuit, and applying reactance matching method accordingly, it is possible to 831 a large the phase shift. Design equation is formulated theoretically. Since the assembly process is important in Ka-band, this paper also includes the assembly process that is essential to minimize the generation of parasitic elements during the assembly process. It is obtained variable phase shift 220$^{\circ}$${\pm}$7$^{\circ}$ and insertion loss 5 dB${\pm}$1 dB as a measured result larger than the existing figure in Ka-band.

The Design and Implementation of MCPA for IMT-2000 using Feedforward Linearization (Feedforward 선형화 기법을 이용한 IMT-2000용 MCPA의 설계 및 제작)

  • 노상연;정성찬;정종한;박명석;박천석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.1
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    • pp.99-106
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    • 2001
  • In this paper, an 1-Watt amplifier for IMT-2000 was designed and fabricated using feedfarward method which has the highest linearity and wide bandwidth. Since feedforward is sensitive to surroundings for example heat, input power level, time and so on, adaptive controller using micro controller is adopted. We fabricated a HPA with 35 dB gain, 40 dBm of 1-dB compression point, and utilized variable attenuator and variable phase shifter using reflection type to cancel loop signal. From the measured results, the fo11owing facts were obtained, in signal loop, main carrier over 35 dB was suppressed and error signal over 30 dB is cancelled in error loop, IMD characteristics above 60 dBc were obtained.

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Design of a Miniaturized 5.3 GHz 360° Analog Phase Shifter (소형화된 5.3 GHz 대역 360° 아날로그 위상천이기 설계)

  • Jeong, Hae-Chang;Son, Bon-Ik;Lee, Dong-Hyun;Ahmed, Abdul-Rahman;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.6
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    • pp.602-612
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    • 2013
  • In this paper, a design and fabrication of miniaturized 5.3 GHz reflection type $360^{\circ}$ analog phase shifter with branch line coupler and $360^{\circ}$ variable reactance load. In order to miniaturize phase shifter, novel branch line coupler is proposed. The novel branch line coupler is miniaturized using transformation of transmission line to T and ${\pi}$ type equivalent circuit. The miniaturized branch line coupler has small size of above 50 % compared with conventional branch line coupler. For wide phase shift range, $360^{\circ}$ variable reactance load structure is adopted. Especially, the structure was improved for linear phase shift by adding transmission line which acts as an impedance transformer. The improved structure was miniaturized using the equivalent lumped-element of transmission line. The fabricated phase shifter with $15{\times}15mm^2$ shows wide phase shift of above $480^{\circ}$, the insertion loss of -4~-6 dB and the reflection loss of below -20 dB at 5.3 GHz under 0~10 V control voltage range.

A Study on Implementation and Performance Evaluation of Error Amplifier for the Feedforward Linear Power Amplifier (Feedforward 선형 전력증폭기를 위한 에러증폭기의 구현 및 성능평가에 관한 연구)

  • Jeon, Joong-Sung;Cho, Hee-Jea;Kim, Seon-Keun;Kim, Ki-Moon
    • Journal of Navigation and Port Research
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    • v.27 no.2
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    • pp.209-215
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    • 2003
  • In this paper. We tested and fabricated the error amplifier for the 15 Watt linear power amplifier for the IMT-2000 baseband station. The error amplifier was comprised of subtractor for detecting intermodulation distortion, variable attenuator for control amplitude, variable phase shifter for control phase, low power amplifier and high power amplifier. This component was designed on the RO4350 substrate and integrated the aluminum case with active biasing circuit. For suppression of spurious, the through capacitance was used. The characteristics of error amplifier measured up to 45 dB gain, $\pm$0.66 dB gain flatness and -15 dB input return loss. Results of application to the 15 Watt feedforward Linear Power Amplifier, the error amplifier improved with 27 dB cancellation from 34 dBc to 61 dBc IM$_3$.