Extended-stopband bandpass filter using both half- and quarter-wavelength resonators

被引：41

作者：

Lin, SC ^{[1
]}

Lin, YS

Chen, CH

机构：

[1] Natl Taiwan Univ, Dept Elect Engn, Taipei 106, Taiwan

[2] Natl Taiwan Univ, Grad Inst Commun Engn, Taipei 106, Taiwan

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2006年 / 16卷 / 01期

关键词：

cross-coupled bandpass filter (BPF); extended stopband; half-wavelength resonator; microstrip; quarter-wavelength resonator;

D O I：

10.1109/LMWC.2005.860014

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 novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (lambda/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f(0) where f(0) stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 fo to 5.2 fo.

引用

页码：43 / 45

页数：3

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