High-selectivity tunable planar combline filter with source/load-multiresonator coupling

被引：39

作者：

Sanchez-Renedo, Manuel ^{[1
]}

机构：

[1] Univ Carlos III Madrid, Dept Elect Technol, Madrid 28911, Spain

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2007年 / 17卷 / 07期

关键词：

bandpass filters (BPFs); combline filters; microstrip filters; microwave filters; transmission zeros; tunable filters;

D O I：

10.1109/LMWC.2007.899313

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A tunable planar combline filter exhibiting multiple transmission zeros is reported in this-letter. By introducing two new coupled lines, the source/load-multiresonator coupling phenomenon is obtained without using additional combline resonators. The transmission zero locations can be adjusted by means of the length of these coupled lines to improve the upper stopband rejection. Moreover, all of these transmission zeros can be tuned at the same time as the passband without distorting the filtering-response shape. Parasitic coupling effects of the proposed filter topology and guidelines for their compensation are also discussed. The described combline filter is experimentally validated with the design and manufacture of a three-stage electronically-tunable prototype with five transmission zeros.

引用

页码：513 / 515

页数：3

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