Tunable Dual-Band Filter and Diplexer Based on Folded Open Loop Ring Resonators

被引:85
作者
Feng, Weijie [1 ]
Zhang, Ying [1 ]
Che, Wenquan [1 ]
机构
[1] Nanjing Univ Sci & Technol, Dept Commun Engn, Nanjing 210094, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Diplexer; dual-band filter; harmonic suppression; open loop ring resonator (OLRRs); tunable;
D O I
10.1109/TCSII.2016.2634555
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
Tunable dual-band filter and diplexer based on folded open loop ring resonators (OLRRs) are proposed in this brief. Two pairs of OLRRs of different center frequencies are utilized to couple with microstrip transmission lines in these two devices, and there is no extra matching network in the diplexer structure. Maximal magnetic coupling and high isolation can be obtained by placing the resonators at proper positions along the feeding lines. The passband/channel frequencies of the dual-band filter/diplexer can be tuned independently by varying dc bias voltages applied to the varactors loaded at one end of the resonators. In addition, a broad harmonic suppression can be obtained by choosing appropriate lumped elements adding to the OLRRs. The performances of the proposed devices can be verified by the simulated and measured results.
引用
收藏
页码:1047 / 1051
页数:5
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