Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Ultra Wideband Bandpsss Filter Design using the CRLH Transmission Line

CRLH 전송선로를 이용한 초광대역 대역통과 필터의 설계 및 구현

  • Kim, Gi-Rae (Department of Electronic Engineering, Silla University)
  • Received : 2013.06.03
  • Accepted : 2013.07.22
  • Published : 2013.10.31
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Abstract

A novel design method of ultra wideband based on the composite right-/left handed (CRLH) transmission line is presented in this paper. Defected ground structure and microstrip interdigital coupler are used to implement the CRLH transmission line. The proposed CRLH transmission line in this paper have composite characteristics of low pass filter and high pass filter, also it has good advantages of low insertion loss and ultra wide passband characteristics. The structure with different cell number are studied, and the UWB filter using 3-cell CRLH transmission line is fabricated and measured, which shows a good agreement between simulated and measured results. It has center frequency of 5 GHz, fractional bandwidth of 105 %, and insertion loss of 0.7 dB at center frequency.

본 논문에서는 복합 좌/우향 (CRLH) 전송 선로를 이용하여 초광대역 필터의 새로운 설계 방법에 대해 나타내었다. CRLH 전송선로의 특성을 구현하기 위해 접지면에는 결함 접지면 구조(DGS)와 윗면에는 마이크로스트립 인터디지털 결합기를 이용하였다. 본 논문에서 제안하는 CRLH 전송선로는 저역통과 필터와 고역통과 필터의 특성을 결합한 특성을 나타내며 삽입손실이 적고 광대역 필터 특성을 얻을 수 있는 장점이 있다. 몇 개의 셀 구조에 대해 연구하였으며, 본 논문에서는 3-셀 구조의 UWB 필터를 설계하고 구현하였다. 실험결과와 시뮬레이션 결과가 일치하며 중심주파수 5 GHz에서 105 %의 대역폭을 나타내며 삽입손실은 중심주파수에서 0.7 dB를 나타내었다.

Keywords

References

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