Miniaturized Bandpass Filter with Mixed Electric and Magnetic Coupling Using Hexagonal Stepped Impedance Resonators

被引：4

作者：

Wei, X. -B. ^{[1
,2
]}

Yue, G. -T. ^{[1
]}

Shi, Y. ^{[2
]}

Liao, J. -X. ^{[1
]}

Wang, P. ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Res Inst Elect Sci & Technol, Chengdu 611731, Sichuan, Peoples R China

[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 611731, Sichuan, Peoples R China

来源：

ELECTROMAGNETICS | 2013年 / 33卷 / 07期

基金：

中国国家自然科学基金;

关键词：

bandpass filter; mixed electric and magnetic coupling; hexagonal stepped-impedance resonators; transmission zeros; COMPACT; DESIGN;

D O I：

10.1080/02726343.2013.824320

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 miniaturized fourth-order direct-coupled bandpass filter with good stopband responses using hexagonal stepped-impedance resonators is presented. Based on the odd- and even-mode equivalent circuits, the resonance characteristics of the hexagonal stepped-impedance resonators with mixed electric/magnetic coupling are investigated. Multiple finite-frequency transmission zeros are realized in the stopband but without introducing either cross-coupling between nonadjacent resonators or source-load coupling between input/output ports. The frequency-dependent coupling matrix of the proposed filter is presented. A new bandpass filter centered at 2.45 GHz with 6.5% fractional bandwidth has been designed and fabricated to verify the validity of the proposed method. The measurement result shows four finite transmission zeros in the stopband, located at 0.98 GHz with 73.14-dB rejection, 2.10 GHz with 48.18-dB rejection, 2.75 GHz with 53.80-dB rejection, 3.12 GHz with 57.08-dB rejection, respectively. The circuit only occupies 15.9 x 9.0 mm(2).

引用

页码：550 / 559

页数：10

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