Tunable dual-mode microstrip patch resonators and filters

被引:21
|
作者
Tang, Hui [1 ]
Chen, Jian-Xin [1 ]
Zhou, Li-Heng [1 ]
Bao, Zhi-Hua [1 ]
机构
[1] Nantong Univ, Sch Elect & Informat, Nan Tong 226019, Jiangsu, Peoples R China
关键词
PERTURBATION ARRANGEMENT; DEGENERATE MODES; VARACTOR;
D O I
10.1049/iet-map.2012.0398
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
In this study, tunable dual-mode microstrip patch resonators are presented and utilised to design microstrip bandpass filters (BPFs). The novelty of the designs lies in that the performance of frequency agility can be realised by using either the signal line or the return path (the ground) of microwave transmission line. For the proposed resonators, the resonant frequencies of two coupled degenerate modes can be tuned using a square-loop slot with loaded tunable capacitors on the ground plane or on the patch. The locations of the capacitors are determined according to the electric field distributions of the two orthogonal modes. The variations of the modes in spectrum are studied. Finally, two types of demonstration compact tunable BPFs are designed and fabricated, and the simulated and measured results show good agreement.
引用
收藏
页码:408 / 414
页数:7
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