The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Design of Amplifier Using Harmonic Termination Impedance Matching Tuner and Bias Line

고조파 차단 특성을 가지는 정합용 튜너와 바이어스 선로를 이용한 증폭기 설계

  • Lee Jin-Kuk (Department of Information & Communication Engineering, Chungbuk National University) ;
  • Kim Su-Tae (Department of Information & Communication Engineering, Chungbuk National University) ;
  • Lim Jong-Sik (Division of Information Technology Engineering, Soonchunhyang University) ;
  • Jeong Yong-Chae (Department of Information & Communication Engineering, Chungbuk National University)
  • 이진국 (전북대학교 정보통신공학과) ;
  • 김수태 (전북대학교 정보통신공학과) ;
  • 임종식 (순천향대학교 정보기술공학부) ;
  • 정용채 (전북대학교 정보통신공학과)
  • Published : 2005.12.01
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Abstract

In this paper, a new 3 dB branch line hybrid using asymmetric spiral-shaped defected ground structure(DGS) microstrip is proposed. The proposed branch line hybrid suppresses the 2nd and the 3rd harmonic component effectively. Also a DGS $\lambda$/4 bias line that can suppress high frequency harmonics as well as low frequency intermodulation component is proposed. With the harmonic termination tuner using the proposed hybrid and the harmonic blocking bias line, the 2nd and the 3rd harmonic components of the fabricated amplifier that operated in IMT-2000 basestation transmitting band were suppressed up 25 dB and 27 dB, respectively. The proposed harmonic load-pull setup of amplifier is more easily accomplished with proposed circuits than the previous.

본 논문은 비대칭 나선 구조의 결함 접지 구조(Defected Ground Structure: DGS)를 이용한 새로운 3 dB 브랜치 라인 하이브리드를 제안하였다. 본 논문에 제시된 3 dB 브랜치 라인 하이브리드는 2차와 3차 고조파 성분을 효과적으로 차단할 수 있는 특성을 갖는다. 또한 고조파 성분뿐만 아니라 저주파 혼변조 성분을 효과적으로 제거할 수 있는 DGS $\lambda$/4 바이어스 라인을 제안하였다. 고조파 차단 특성을 가지는 브랜치 라인 하이브리드 튜너와 바이어스 라인을 이용하여 IMT-2000 기지국 송신 대역에서 동작하는 증폭기의 2차, 3차 고조파 성분을 각각 25 dB과 27 dB 감쇄하였다. 본 논문에서 제시한 회로를 이용하면 기존 방법보다 훨씬 용이한 증폭기의 고조파로드-풀 회로를 쉽게 구현할 수 있다.

Keywords

References

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