Title :
A dual-mode bandpass filter with tuning transmission-zero and harmonic suppression for RFID and WiMax applications
Author :
Yao, Zhilei ; Kim, N.Y.
Author_Institution :
Dept. of Electron., Kwangwoon Univ., Seoul, South Korea
Abstract :
A dual-mode T-shape stub loaded bandpass filter (BPF) with wide stopband is proposed. To design a narrow BPF for suitable use in 5.8 GHz radio frequency identification (RFID) and worldwide interoperability for microwave access (WiMax) applications, a dual-mode T-shape stub-loaded resonator (TSSLR) is introduced and studied. Due to the symmetrical plane, odd-even mode theory can be adopted to characterize it. One transmission zero is located near the passband, which leads to a high selectivity. An extra transmission zero can be tuned at the second harmonic frequency to realize a wide stopband. The center frequency of the proposed BPF is 5.8 GHz, and the 3 dB fraction bandwidth is 8.9%. The super response is below 20 dB from 7.1-15.0 GHz.
Keywords :
WiMax; band-pass filters; band-stop filters; microwave circuits; microwave filters; microwave resonators; radiofrequency identification; resonator filters; RFID application; TSSLR; WiMax application; dual-mode T-shape stub loaded bandpass filter; dual-mode T-shape stub-loaded resonator; frequency 5.8 GHz; frequency 7.1 GHz to 15.0 GHz; gain 3 dB; harmonic suppression; narrow BPF; odd-even mode theory; radiofrequency identification; symmetrical plane theory; tuning transmission-zero; wide stopband filter; worldwide interoperability for microwave access; Band-pass filters; Microstrip resonators; Microwave filters; Radiofrequency identification; Resonant frequency; WiMAX; Dual-mode; T-shape stub-loaded resonators; bandpass filter; harmonic suppression;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
DOI :
10.1109/APMC.2013.6694969
