摺疊式共平面波導諧振腔和濾波器

Abstract

研究運用了共平面波導的結構，且採用了耦合係數法和解析法設計了多種電性長度小於90o的梳型和交錯型帶通濾波器，包括兩折共平面波導梳型和交錯型帶通濾波器、改良式兩折共平面波導帶通濾波器、三折共平面波導帶通濾波器。 文中還介紹了有廣義柴式響應特性之四階交錯耦合帶通濾波器(cross-coupled bandpass filter)，最後比較其不同於一般柴式濾波器而在有限頻率上引入傳輸零點，使的通帶之高低頻側邊有較強之頻濾選擇性。

In this thesis, several coplanar waveguide comb-line and interdigital bandpass filters,including double-folded coplanar waveguide comb-line and interdigital bandpass filter、improved two-folded coplanar waveguide bandpass filter、tripple-folded coplanar waveguide filter,with electrical length smaller than 90o are studied by using coupling coefficient method and analytical method。 A coupled quadruplet(CQ) bandpass filter with generalized Chebyshev function response are introduced。The CQ filter shows a very steep skirt at both sides of pass-band because it introduce attenuation poles of finite frequency near the high edge and low edge of the passband。