Band-notched ultra-wideband bandpass filter design using combined modified quarter-wavelength tri-section stepped-impedance resonator

被引：25

作者：

Lee, C. -H. ^{[1
,2
]}

Hsu, C. -I. G. ^{[3
]}

Chen, L. -Y. ^{[1
,2
]}

机构：

[1] Natl Changhua Univ Educ, Grad Inst Commun Engn, Changhua 500, Taiwan

[2] Natl Changhua Univ Educ, Dept Elect Engn, Changhua 500, Taiwan

[3] Natl Yunlin Univ Sci & Technol, Dept Elect Engn, Touliu 640, Yunlin, Taiwan

来源：

IET MICROWAVES ANTENNAS & PROPAGATION | 2009年 / 3卷 / 08期

关键词：

D O I：

10.1049/iet-map.2008.0340

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：

This study presents a new band-notched ultra-wideband (UWB) bandpass filter (BPF) that is designed using a new structure-shared multi-mode resonator (MMR). The MMR is formed by combining two quarter-wavelength (lambda/4) tri-section stepped-impedance resonators (TSSIRs) in a proper fashion to exhibit both lambda/4 and half-wavelength (lambda/2) types of resonance. With the first two resonant frequencies of the inherent lambda/4 TSSIR, the first two of the parasitic lambda/2 SIR and the coupling peaks of the input/output interdigital parallel-coupled lines properly located in the UWB passband, a six-transmission-pole UWB BPF can be realised. In this filter design, besides obtaining a uniform in-band transmission response, a notched band centred around 5.5 GHz is created by embedding L-shaped open-end slots in the TSSIR and loading the TSSIR with closely coupled winding-type resonators (WTRs) to filter out the 5-GHz wireless local-area network radio signal interferences. In addition, spur-lines are embedded in the TSSIR to sharpen the passband skirts for selectivity improvement.

引用

页码：1232 / 1236

页数：5

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