Title :
Hybrid Microstrip/DGS Cell for Filter Design
Author :
Luo, Xun ; Ma, Jian-Guo ; Li, Er-Ping
Author_Institution :
Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
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 .
Keywords :
UHF filters; band-pass filters; band-stop filters; defected ground structures; microstrip filters; network synthesis; poles and zeros; attenuation slope; compact bandpass filter design; defected ground structure; dual-resonance operation; frequency 2.455 GHz; hybrid microstrip-DGS cell; interdigital-coupled scheme; narrow-band coupling; passband enhancement; stopband filter; transmission zeros; Band pass filters; Filtering theory; Integrated circuits; Microstrip; Microstrip filters; Passband; Wireless communication; Bandpass filter (BPF); defected ground structure (DGS); high selectivity; interdigital-coupled (IC); wide stopband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2163497
