An electronically tunable microstrip bandpass filter using thin-film barium-strontium-titanate (BST) varactors

被引：211

作者：

Nath, J ^{[1
]}

Ghosh, D

Maria, JP

Kingon, AI

Fathelbab, W

Franzon, PD

Steer, MB

机构：

[1] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA

[2] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2005年 / 53卷 / 09期

关键词：

barium strontium titanate (BST); combline filter; ferroelectric films; intermodulation distortion; microstrip filters; resonators; thin-film devices; tunable filters; varactor;

D O I：

10.1109/TMTT.2005.854196

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 third-order combline bandpass filter using thin-film barium-strontium-titanate varactors and fabricated on a sapphire substrate is reported. Application of 0-200-V bias varied the center frequency of the filter from 2.44 to 2.88 GHz (16% tuning) while achieving a 1-dB bandwidth of 400 MHz. The insertion loss varied from 5.1 dB at zero bias to 3.3 dB at full bias, while the return loss exceeded 13 dB over the range. The third-order intercept of the filter was found to be 41 dBm.

引用

页码：2707 / 2712

页数：6

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