Title :
Novel compact dual-band bandpass filter with multiple transmission zeros and good selectivity
Author :
Doan, MinhTan ; Che, Wenquan ; Feng, Wenjie
Author_Institution :
Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
A novel compact microstrip dual-band bandpass filter (BPF) using short-stub loaded half-wavelength resonator with multiple transmission zeros and good selectivity is proposed in this letter. The characteristics of the dual-mode resonator are investigated by using even-odd mode analysis. To improve filter selectivity, a new structure of hook feed line of couple-line is introduced to produce six transmission zeros at the adjacent two passbands. A prototype of dual-band bandpass filter for WLAN (2.4 GHz) and WiMAX (3.5 GHz) applications is designed and fabricated for demonstration. Good agreement is observed between the measured and the theoretical expectation.
Keywords :
WiMax; antenna feeds; band-pass filters; microstrip filters; resonator filters; wireless LAN; WLAN; WiMAX; adjacent two passbands; compact microstrip dual-band bandpass filter; couple-line; dual-mode resonator; even-odd mode analysis; frequency 2.4 GHz; frequency 3.5 GHz; hook feed line; multiple transmission zeros; short-stub loaded half-wavelength resonator; Band pass filters; Dual band; Feeds; Filtering theory; Passband; Resonant frequency; Resonator filters; Dual-band bandpass filter; fractional bandwidth; multiple transmission zeros; short-stub loaded half-wavelength resonator;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4673-2184-6
DOI :
10.1109/ICMMT.2012.6230401
