Propagation Characteristics of Picosecond Gaussian Pulses in Coplanar Waveguides using Time Domain Measurement

시간영역 측정을 이용한 CPW에서 가우시안 펄스 전송 특성

  • Published : 2003.11.01

Abstract

The distortion of picosecond pulses caused by dispersion as it propagates along microstripline and CPW(Coplanar waveguide) is investigated and measured using time domain measurement. Especially, this study presents that the distortion of these lines is analyzed and compared considering the relation between the dispersion effect and cut-off frequency(f$\_$TE/) of fundamental TE mode for the substrate of line. To verify theoretical results, several samples of 50 $\Omega$ lines are fabricated on the two kind of substrates with the different values of f$\_$TE/. The propagation characteristics of picosecond Gaussian pulse on thess lines are simply measured using VNA(Vector Network Analyzer) with the time-domain analysis function.

CPW와 마이크로스트립선로에서 수십 피코초의 펄스 폭을 갖는 가우시안(Gaussian) 펄스 신호가 진행해 갈 때 기판 및 선로 구조에 따른 분산 및 펄스의 전파 특성을 시간 영역에서 해석하고 측정하였다. 특히, 선로에 사용된 기판의 기본 TE 모드에 대한 차단 주파수( $f_{TE}$ )의 변화에 따른 CPW와 마이크로스트립 선로간의 전송특성을 구하고 비교하였다. 이를 실험적으로 확인하기 위해 $f_{TE}$ 가 다른 기판에 두 가지 50 $\Omega$ 선로를 제작하여 수십 피코초 펄스가 진행되었을 때의 전송 특성을 시간 영역 분석기능이 내장된 VNA(Vector Network Analyzer)를 이용해서 측정하였다.

Keywords

References

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