A Tunable Microstrip Bandpass Filter With Two Independently Adjustable Transmission Zeros

被引：65

作者：

Long, Jiang ^{[1
]}

Li, Changzhi ^{[2
]}

Cui, Wanzhao ^{[3
]}

Huangfu, Jiangtao ^{[1
]}

Ran, Lixin ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Informat & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China

[2] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79424 USA

[3] Natl Key Lab Sci & Technol Space Microwave Techno, Xian, Peoples R China

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2011年 / 21卷 / 02期

关键词：

Bandpass filter (BPF); microstrip filter; transmission zero; tunable filter; varactor;

D O I：

10.1109/LMWC.2010.2097243

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：

In this letter, a tunable microstrip bandpass filter (BPF) with two independently adjustable transmission zeros (TZs) is reported. By introducing two microwave varactors to tune the TZs, the center frequency and the bandwidth of the BPF can be separately adjusted within a broad tuning range by varying the dc bias voltages applied to the varactors. Theoretical analysis and design approach are described. The experimental result of a demonstrative BPF shows that a less than 4 dB insertion loss, a relative bandwidth of 9% and a center frequency tunable from 1.4 to 2 GHz are obtained. The measured performance of the fabricated filter shows good agreement with the proposed theory.

引用

页码：74 / 76

页数：3

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