Title :
Microstrip Open-Loop Ring Bandpass Filter Using Open Stubs for Harmonic Suppression
Author :
Tu, Wen-Hua ; Li, Huifeng ; Michalski, Krzysztof A. ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX
Abstract :
Improved harmonic suppression is achieved by adding small shunt open stubs to a conventional open-loop bandpass filter. A design curve for the shunt open stub is derived using the ABCD matrix calculation. The insertion loss of the four-pole filter is 3 dB at 1.8385 GHz, and the return loss is better than 10 dB within 1.7935-1.8835 GHz. The suppression of the modified filter is better than 30 dB below 1.7 GHz and between 2-6 GHz, while the conventional filter shows a spurious passband at 3.7 GHz
Keywords :
UHF filters; band-pass filters; harmonics suppression; microstrip filters; microwave filters; 1.7935 to 1.8835 GHz; 2 to 6 GHz; 3 dB; ABCD matrix calculation; harmonic suppression; microstrip filters; open stubs; open-loop bandpass filters; ring bandpass filters; Band pass filters; Harmonics suppression; Microstrip filters; Passband; Power harmonic filters; Resonance; Resonant frequency; Resonator filters; Shunt (electrical); Transmission line matrix methods; harmonic suppression; open-loop bandpass filter; ring filter;
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.2006.249543
