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A novel compact ring dual-mode filter with adjustable second-passband for dual-band applications

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6 Author(s)
Tsung-Hui Huang ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Han-Jan Chen ; Chin-Sheng Chang ; Lih-Shan Chen
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In this letter, a novel compact ring dual-mode with adjustable second-passband for dual-band applications are presented. A ring resonator with two different geometric dimensions are derived and designed to have identical fundamental and the first higher-order resonant frequencies, and to establish appropriate couplings in the structure. Moreover, the proposed filter has smaller size as compared with the basic topology of stopband filters and stepped-impedance-resonator (SIR) filters. The measured filter performance is in good agreement with the simulated response.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 6 )