立體超緊耦合結構之研究與其在寬頻耦合器與帶通濾波器的應用

Abstract

本論文主要在研究立體超緊耦合結構，以及其在寬頻耦合器與帶通濾器上的應用。其中所提的二種新型立體超緊耦合結構是一種在兩旁有介質方塊的垂直基板平面電路結構。運用所提此二種耦合結構，我們可以解決實現超寬頻多節串接式混成器所面臨的超緊耦合量、奇偶模模態速度不等與不連續接面等挑戰。在適當的設計之下，我們可以實現一個效能極佳的超寬頻混成器。經由進一步的變化，我們提出並且分析另外二種濾波器結構分別是垂直基板平面電路步階阻抗諧振器與懸置基板帶線步階阻抗諧振器。此二種諧振器所構成的帶通濾波器結構可以實現濾波器具有寬的通帶頻寬(大於二比一)、好而且寬的上止帶表現但是只須要使用一般的印刷電路板製程技術。對於所提結構有詳細的特性敘訴與分析，並且介紹系統化的設計流程以及其在實例上的驗證。

This dissertation presents the research and applications of three-dimensional extremely tight coupling structures. Two of them are the modified vertically installed planar structures with dielectric block at both side of vertical substrate. With these two newly proposed structures, we have overcome the three main challenges in realization of ultra-broadband multi-section quadrate hybrid. The challenges are to obtain an extremely tight coupling value, to compensate the unequal even- and odd-mode modal phase velocitys, and to minimize the discontinuous effect at junctions. Thanks to the proposed structures a five-section ultra-broadband quadrate hybrid with excellent performance is realized. Extending the application of tight coupling structures to broadband filters, two stepped impedance resonator (SIR) structures are proposed. The proposed SIR structures are the vertically installed planar stepped impedance resonator (VIPSIR) and the suspended substrate stripline stepped impedance resonator (SSSSIR). These two filter structures can realize bandpass filters with broad passband of larger than 1:2, good and wide upper stopband performance. More importantly, conventional PCB process can be applied to mass produce both filters. The analysis procedures and the characteristics of the proposed structures are described in detail. Moreover, systematical design procedures are given and proved to be valid with several experimental examples in this dissertation.