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Hybrid Microstrip/DGS Cell for Filter Design

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3 Author(s)
Xun Luo ; Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Jian-Guo Ma ; Er-Ping Li

In this letter, a compact bandpass filter is proposed based on the hybrid microstrip/defected ground structure (DGS) cells with an interdigital-coupled (IC) scheme. The hybrid cell can employ two functions for the filter: 1) dual-resonances operation and 2) two close transmission zeros around the resonances. With a proper coupled scheme (i.e., the IC scheme), the narrow-band coupling for the passband enhancement of high selectivity and wide stopband can be achieved. Then, a filter operated at 2.455 GHz (i.e., f0) is fabricated, which shows the strong attenuation slope with 427.2 dB/GHz in the lower and 779.1 dB/GHz in the upper transition bands and a wide stopband up to 3.56f0 .

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:21 ,  Issue: 10 )