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
收藏
页码：43 / 45
页数：3
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