Title :
Dual Quarter-Wavelength Hairpin Bandpass Filter with Multiple Transmission Zeros
Author :
Lin, Shih-Cheng ; Wang, Chi-Hsueh ; Lin, Yo-Shen ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
A novel dual quarter-wavelength (lambda/4) hairpin microstrip resonator is proposed, which is composed of two lambda/4 stepped-impedance resonators (SIR´s) that are coupled through a shorted stub section. In this study, the dual resonator structure is utilized to design a bandpass filter for which the filter order may be doubled and the via number required in the conventional lambda/4 filter may be reduced to half. Specifically, a four-pole quasi-elliptic microstrip filter is realized with two pairs of transmission zeros created around the passband edges so that the filter selectivity may be improved
Keywords :
band-pass filters; elliptic filters; microstrip filters; microstrip resonators; poles and zeros; resonator filters; bandpass filters; hairpin microstrip resonator; quarter-wavelength resonator; quasielliptic microstrip filter; stepped-impedance resonator; transmission zero; Band pass filters; Chebyshev approximation; Equations; Equivalent circuits; Filtering theory; Frequency; Microstrip filters; Microstrip resonators; Passband; Resonator filters; Microstrip; bandpass filter; quarter-wavelength resonator; selectivity; stepped-impedance resonator; transmission zero;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249544
