Design of High-Order Wideband Planar Balun Filter in S-Plane Bandpass Prototype

被引：28

作者：

Lin, Yun-Wei ^{[1
]}

Lu, Jhe-Ching ^{[2
]}

Chang, Chi-Yang ^{[1
]}

机构：

[1] Natl Chiao Tung Univ, Dept Commun Engn, Hsinchu 300, Taiwan

[2] Taiwan Semicond Manufacture Co Ltd TSMC, RF Modeling Program, Hsinchu 300, Taiwan

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2012年 / 60卷 / 07期

关键词：

Balun filter; bandpass prototype; impedance transformation; planar structure; synthesis; MARCHAND BALUNS;

D O I：

10.1109/TMTT.2012.2193137

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 new high-order wideband planar balun filter is proposed in this paper. The balun filter is exact synthesized based on S-domain bandpass prototype using Richards' Theorem to fit the user-defined specifications. By analyzing the redundant element in the equivalent circuit, the output impedance of the balun filter can be arbitrarily assigned. To use an S-plane bandpass prototype other than a high-pass prototype can shrink the circuit area and improve the stopband performance. The lumped capacitor approximation suppresses the spurious response in the stopband and further reduces the circuit size. A high-order balun filter with a bandwidth of 100% and a reflection coefficient of -15 dB is implemented by combining of microstrip lines, slotlines, and coplanar striplines. The simulation and measurement results match well.

引用

页码：2124 / 2130

页数：7

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