DocumentCode :
1082819
Title :
A Wideband Bandpass Filter With Wide Upper Stopband Using Stepped-Impedance Cascadable 180 ° Hybrid Rings
Author :
Chi, Chun-Hsiang ; Chang, Chi-Yang
Author_Institution :
Nat. Chiao Tung Univ., Hsinchu
Volume :
17
Issue :
8
fYear :
2007
Firstpage :
589
Lastpage :
591
Abstract :
This letter proposes a wideband bandpass filter by cascading two 3-dB stepped-impedance cascadable 180deg hybrid rings with a pair of stepped-impedance lines. Thanks to the stepped-impedance lines, a broad upper stopband is achieved. The stepped-impedance vertically installed planar (VIP) coupler is used to implement the ideal 180deg phase inverter and crossovers. The experimental results show that this 2-GHz center frequency, fourth order filter has a 10-dB return loss bandwidth of 92.5% and upper stopband rejection levels of better than -20 dB up to 6.8 GHz. This proposed filter achieves wide passband and broad stopband performance simultaneously.
Keywords :
UHF filters; band-pass filters; microstrip couplers; microstrip filters; crossover; fourth order filter; frequency 2 GHz; phase inverter; return loss bandwidth; stepped-impedance cascadable 180deg hybrid rings; stepped-impedance lines; stepped-impedance vertically installed planar coupler; upper stopband rejection levels; wide upper stopband; wideband bandpass filter; Band pass filters; Bandwidth; Frequency; Insertion loss; Inverters; Microstrip; Passband; Power harmonic filters; Resonator filters; Wideband; Phase inverter; stepped-impedance; vertically installed planar (VIP) coupler; wideband bandpass filter (BPF);
fLanguage :
English
Journal_Title :
Microwave and Wireless Components Letters, IEEE
Publisher :
ieee
ISSN :
1531-1309
Type :
jour
DOI :
10.1109/LMWC.2007.901771
Filename :
4285661
Link To Document :
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