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Development of a 85~115 GHz 90-Deg Phase Shifter Using Corrugated Square Waveguide

Corrugated 정사각형 도파관 구조를 이용한 85~115 GHz 90도 위상천이기 개발

  • Received : 2013.10.22
  • Accepted : 2013.11.29
  • Published : 2013.12.31

Abstract

A 90-deg phase shifter using corrugated square waveguide structure for 86 GHz band VLBI(Very Long Baseline Interferometry) dual-circular polarization observation has been developed. The 90-deg phase shifter was designed to have two corrugated walls inside the square waveguide so that the vertically and horizontally polarized waves at the output port have phase differences of $90{\pm}3.3$ deg across 85~115 GHz. Measurements show that the return and insertion losses for the both polarizations are better than 17 dB and 0.25 dB, respectively. The axial ratio is estimated to be less than 0.6 dB within the required frequency band.

86 GHz 대역 VLBI(Very Long Baseline Interferometry) 이중원형 편파 관측에 사용되는 90도 위상천이기를 Corrugated 정사각형 도파관 구조를 이용하여 개발하였다. 이 90도 위상천이기는 정사각형 도파관 내부에 Corrugation 구조를 만들어 정사각형 도파관을 통과한 수직, 수평 편파의 위상차이가 85~115 GHz 대역에서 $90{\pm}3.3$도 이내가 되도록 설계하였고, 제작 후 측정 결과는 위 주파수 대역에서 반사 손실과 삽입 손실이 각각 17 dB, 0.25 dB 이하이고 Axial ratio는 0.6 dB 이하이다.

Keywords

References

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