基板合成波導之濾波器及多工器設計

Substrate integrated waveguide filter and diplexer design

劉大維(Da-Wei Liu)

指導教授 ： 黃建彰

元智大學/電機通訊學院/通訊工程學系/碩士(2007年)

摘要

隨著通訊的進步，產品所使用頻率越來越高，對於產品之特性規格需求也逐漸增加。當設計頻率不斷提高的同時，電路損耗的增大、產品製作和量測的困難等，都將是亟待解決的問題。本論文將由傳統波導設計理論及方法著手，搭配上基板合成波導理論及架構，設計出基板合成波導濾波器及多工器。
饋入電路是用來連接基板合成波導與 微帶線之裝置，一般皆利用線性轉接形式，論文中將自動化設計之方式，設計出新式指數型饋入微帶線，在頻率8.5-13GHz間，反射損耗大於20dB。
濾波器部份分為薄膜耦合濾波器及雙模共振濾波器。薄膜耦合濾波器實作之結果，中心頻率的插入損耗小於 3 dB，反射損耗在通帶時大於17 dB，3dB頻寬約為8.2%。雙模共振濾波器實作之結果，中心頻率的插入損耗小於 3 dB，反射損耗在通帶時大於13 dB，3dB頻寬為13.2%。
多工器的設計是利用Y型直式波導連接器及二個不同頻段之雙模共振濾波器進行設計。實作結果，低頻部份中心頻率的插入損耗約為 3 dB，反射損耗在通帶時大於15 dB，3dB頻寬約為7.8%；高頻部份中心頻率的插入損耗約為5.5dB，反射損耗在通帶時大於12 dB，3dB頻寬約為6.1%；埠端2和埠端3之間隔離度大於17dB。

關鍵字

基板合成波導 ； 薄膜耦合濾波器 ； 雙模共振濾波器 ； 多工器

並列摘要

Along with the communication progress, the frequency that product uses is getting higher and higher, and the product requirements become more and more stringent. When the design frequency gradually increases, there are lots of problems to overcome, such as more loss of circuit, difficulties of manufacturing and measuring product. In this paper, beginning by the traditional waveguide theory and design method, application of the substrate integrated waveguide (SIW) techniques, to design substrate integrated waveguide filter and diplexer.
The transition is use to connect SIW and microstrip line. In this paper, use the automated design method to design a new type of transition by exponential taper. From 8.5GHz to 13GHz, the return loss is less than 20dB.
In the part of filter, it divided into iris-coupled filter and dual-mode filer. The iris-coupled filter measured with less than 3dB insertion loss, more than 17dB return loss, and 8.2% 3dB bandwidth. The dual-mode filter measured with less than 3dB insertion loss, more than 13dB return loss, and 13.2% 3dB bandwidth.
Diplexer designed by H-plane straight Y-junction and two dual-mode filters with different passband. The lower band measured with 3dB insertion loss, more than 15dB return loss, and 7.8% 3dB bandwidth. The upper band measured with 5.5dB insertion loss, more than 12dB return loss, and 6.1% 3dB bandwidth. The isolation between port 2 and port 3 is more than 17dB.

並列關鍵字

substrate integrated waveguide (SIW) ； iris-coupled filter ； dual-mode filer ； diplexer

參考文獻

[1] N. Marcuvitz, Waveguide Handbook, Peter Peregrinus Ltd., 1986.

[2] D. Deslanded and K. Wu, “Integrated Microstrip and Rectangular Waveguide in Planer Form,” IEEE Microwave and Wireless Component Letters, vol. 11, no. 2, pp.

68-70, Feb. 2001.

[3] D. Deslanded and K. Wu, “Integrated transition of coplanar to rectangular waveguide,” IEEE MTT-S Int. Microwave Symp. Dig., vol. 2, pp 619-622, May

[4] D. M. Pozar, Microwave Engineering, 3rd edition, John Wiley and Sons, 2005.