使用混合微帶線與背地共平面波導之諧振腔製作微小化帶通濾波器

Abstract

本論文提出使用混合微帶線與背地共平面波導之諧振腔製作微小化帶通濾波器。在論文第一部份，將簡介耦合係數法，並利用此方法分析外部品質因數與內部耦合係數，再透過電磁模擬軟體，找出相對應的濾波器諧振腔尺寸，讓整個複雜的濾波器設計流程變得簡單、快速。在論文第二部份，以柴比契夫響應設計梳型、指叉型、折疊型和渦型之帶通濾波器。論文的最後，利用準橢圓濾波器的之合成方式，設計出在有限頻率的範圍內，產生一對傳輸零點高選擇性的帶通濾波器。

This thesis presents the novel miniaturized bandpass filters with combined microstrip-CBCPW (conductor-backed coplanar waveguide) resonator. The filters are designed by coupling coefficient method. Using this method the external quality factors and the internal coupling coefficients can be obtained. Then, utilizing EM simulation software obtains relative resonator dimensions corresponding to previously determined external quality factors and the internal coupling coefficients. The whole filter design procedure is simple and concise. In this thesis, combline, interdigital, folded and spiral bandpass filters with Chebyshev response are designed. Finally, a quasi-elliptic filter synthesis method is used to design highly selective narrow bandpass filters with a pair of finite frequency transmission zeros.