Compact Quad-Band Bandpass Filter Using Quad-Mode Stepped Impedance Resonator and Multiple Coupling Circuits

被引：43

作者：

Bukuru, Denis ^{[1
]}

Song, Kaijun ^{[1
]}

Zhang, Fan ^{[1
]}

Zhu, Yu ^{[1
]}

Fan, Maoyu ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Elect Engn, EHF Key Lab Sci, Chengdu 611731, Peoples R China

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2017年 / 65卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Bandpass filter (BPF); compact; quad-band; quad-mode; stepped impedance resonator (SIR); LOADED RESONATOR; DUAL-PASSBAND; DESIGN;

D O I：

10.1109/TMTT.2016.2638814

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 compact quad-band bandpass filter using quadmode stepped impedance resonator (QMSIR) is investigated in this paper. To get suitable coupling within the four passbands, the multiple coupling circuits between the input/output ports and QMSIR are applied. Based on the symmetry of the QMSIR, even- and odd-mode theory is used to analyze the equivalent circuits of the QMSIR. Design equations are derived, and they are used to guide the design of the circuits. Four passbands can be easily tuned by its physical dimensions. Upper stopband is improved by adding the open-loop SIRs at both I/O ports. Transmission zeros among each passbands are generated, resulting in high isolation and frequency selectivity. An experimental circuit is fabricated and evaluated to validate the design concept. The measurement results are in good agreement with the full-wave simulation results.

引用

页码：783 / 791

页数：9

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