Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Sapphire Based 94 GHz Coplanar Waveguide-to-Rectangular Waveguide Transition Using a Unilateral Fin-line taper

평면형 Fin-line 테이퍼를 이용한 사파이어 기반의 94 GHz CPW-구형 도파관 변환기

  • Moon, Sung-Woon (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Lee, Mun-Kyo (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Oh, Jung-Hun (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Ko, Dong-Sik (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Hwang, In-Seok (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Rhee, Jin-Koo (Millimeter-wave Innovation Technoprlogy research center, MINT) ;
  • Kim, Sam-Dong (Millimeter-wave Innovation Technoprlogy research center, MINT)
  • 문성운 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 이문교 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 오정훈 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 고동식 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 황인석 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 이진구 (동국대학교 밀리미터파 신기술 연구센터) ;
  • 김삼동 (동국대학교 밀리미터파 신기술 연구센터)
  • Published : 2008.10.25
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Abstract

We design and fabricate the 94 GHz Coplanar waveguide(CPW)-to-rectangular waveguide transition that is transmits signal smoothly between the CPW, which is a popular transmission line of the planar circuits, and rectangular waveguide for the 94 GHz transceiver system. The proposed transition composed of the unilateral fin-line taper and open type CPW-to-slot-line transition is based on the hard and inflexible sapphire for the flip-chip bonding of the planar MMICs using conventional MMIC technology. We optimize a single section transition to achieve low loss by using an EM field solver of Ansoft's HFSS and fabricate the back- to-back transition that is measured by Anritsu ME7808A Vector Network Analyzer in a frequency range of $85{\sim}105$ GHz. From the measurement and do-embedding CPW with 3 mm length, an insertion and return loss of a single-section transition are 1.7 dB and more an 25 than at 94 GHz, respectively.

본 연구에서는 94 GHz 송수신 시스템에 응용이 가능한 평면형 회로 내의 전송 선로 방식의 하나인 CPW(Coplanar Waveguide)와 구형 도파관 간의 신호를 원활히 전달해주는 94 GHz CPW-구형 도파관 변환기를 설계하고 제작하였다. 제안된 변환기는 단일 면에 구현된 Fin-line 테이퍼와 Open 타입의 CPW-Slot-line 변환기 구조로 구성되어 있으며, 이는 MMIC의 플립칩 본딩을 위해 기존의 MMIC 기술을 이용하여 단단하고 구부러지지 않는 사파이어($Al_2O_3$)기판위에 구현되었다. Ansoft사의 HFSS 툴을 이용하여 최적화된 Single-section 변환기를 Back-to-back 구조의 지그로 제작하였고 Anritsu ME7808A Vector Network Analyzer 장비를 이용해 $85{\sim}105$ GHz를 대역에서 S-파라미터들을 측정하였다. 측정 결과, 3 mm 길이를 갖는 CPW의 삽입 손실을 고려하여 94 GHz에서 약 1.7 dB의 삽입 손실과 25 dB 이상의 반사손실을 확인 하였다.

Keywords

References

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