DocumentCode :
725173
Title :
Low insertion loss bandpass filter with controllable transmission zeros using stepped impedance resonator
Author :
Yun Wang ; Qing-Xin Chu ; Fu-Chang Chen ; Jie-Ming Qiu
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
fYear :
2015
fDate :
March 30 2015-April 1 2015
Firstpage :
1
Lastpage :
4
Abstract :
A transmission-line bandpass filter based on bandstop filter is proposed in this paper. A key merit of the filter configuration is that the position of the transmission zeros can be conveniently controlled whereas the bandwidth is fixed. The bandpass filter consists of two half-wavelength resonators, two open circuited uniform impedance resonators and one stepped impedance resonator. With five reflection zeros generated in the passband, six controllable transmission zeros are introduced to sharpen the passband skirts. Without coupling gaps between resonators, the new filter show low insertion loss and is easy for fabrication. To verify the design concept, one filter example has been designed, fabricated and measured. Good insertion/return losses, flat group delay, sharp transition and simple topology are achieved as demonstrated in both simulation and experiment.
Keywords :
band-pass filters; band-stop filters; resonators; bandstop filter; controllable transmission zeros; half-wavelength resonators; low insertion loss bandpass filter; one stepped impedance resonator; open circuited uniform impedance resonators; stepped impedance resonator; transmission-line bandpass filter; Filtering theory; Frequency measurement; Indexes; Passband; Propagation losses; Topology; Wireless communication; bandpass filter; microstrip; selectivity; transmission zero;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Symposium (IWS), 2015 IEEE International
Conference_Location :
Shenzhen
Type :
conf
DOI :
10.1109/IEEE-IWS.2015.7164538
Filename :
7164538
Link To Document :
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