The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Bandpass Filter Using Folded Substrate Integrated Waveguide Structure

접힌 기판 집적형 도파관 구조를 이용한 대역통과 필터

  • 윤태순 (호남대학교 전자공학과)
  • Received : 2018.07.16
  • Accepted : 2018.10.15
  • Published : 2018.10.31
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Abstract

In this paper, the transition of the folded substrate integrated waveguide (FSIW) using two substrates is suggested and applied to the bandpass filter. The FSIW has similar characteristics with the SIW and can be reduced the width of the SIW. The transition between the FSIW to the microstrip is designed by using shorted quarter wavelength line. Also, the bandpass filter is designed by using the FSIW and the elliptic lowpass filter of 5 section. Fabricated bandpass filter has the center frequency of 5.75 GHz and the bandwidth of 33.2%. Also, the insertion loss and return loss at the center frequency are 0.63dB and 19.1dB, respectively.

본 논문에서는 두 장의 기판을 이용하여 접힌 기판 집적형 도파관 구조의 활용을 위한 트랜지션이 제안되었고, 이러한 FSIW 구조는 간단한 대역통과 필터로 응용되었다. FSIW 구조는 SIW 구조와 유사한 특성을 가지며 도파관의 장축을 반으로 줄일 수 있다는 장점이 있다. FSIW 구조의 트랜지션은 접지에 연결된 ${\lambda}g/4$ 선로를 이용하여 설계되었고, FSIW 구조의 대역통과 필터는 5단의 타원함수 특성을 갖는 저역통과 필터를 FSIW 구조의 입출력부에 연결하여 설계하였다. 제작된 FSIW 구조의 대역통과 필터는 중심주파수 5.75 GHz, 대역폭 33.2%를 가졌고, 중심주파수에서 삽입 손실과 반사 손실은 각각 0.63dB와 19.1dB를 가졌다.

Keywords

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