Novel Wideband Differential Bandpass Filters Based on T-Shaped Structure

被引：131
作者：
Feng, Wenjie [1 ]
Che, Wenquan [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Dept Commun Engn, Nanjing 210094, Jiangsu, Peoples R China
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2012年 / 60卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Bandpass filter; differential/common mode; fractional bandwidth; T-shaped structure; wideband; STEPPED-IMPEDANCE RESONATORS; DUAL-BAND; MICROSTRIP FILTERS; DESIGN;
D O I：
10.1109/TMTT.2012.2188538
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：
Two novel wideband differential bandpass filters based on a T-shaped structure are proposed in this paper. Broad passband and wideband harmonic suppression for the differential/common mode can be easily achieved for the wideband differential filter without cross coupling, due to the controlled resonator frequencies of the shorted/open T-shaped structure. In addition, another more compact differential filter using cross coupling is proposed with two transmission zeros close to the passband to improve the selectivity for the differential mode. To verify the presented concept, two prototypes (epsilon(r) = 2.65, h = 0.5 mm) with 3-dB fractional bandwidth of 70% and 70.7% for the differential mode and insertion loss greater than 13.5 dB for common mode (0-19 GHz) are designed and fabricated. Good agreement can be observed between measured results and theoretical expectations.
引用
收藏
页码：1560 / 1568
页数：9
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