Title :
Novel Balanced Dual-Band Bandpass Filter Using Coupled Stepped-Impedance Resonators
Author :
Shi, Jin ; Xue, Quan
Author_Institution :
State Key Labs. of Millimeter Waves, City Univ. of Hong Kong, Kowloon, China
Abstract :
A novel balanced dual-band bandpass filter, using coupled stepped-impedance resonators (SIRs), is proposed in this letter. The differential- and common-mode equivalent half circuits are given. By properly designing the resonators, associated with the filter composed of eight SIRs, dual-band differential-mode bandpass response can be obtained. To improve the common-mode suppression level, two open stubs with different lengths are added to the connection point of two resonators. A prototype balanced filter operating at 2.4 and 5 GHz has been realized to validate the proposed concept and theory.
Keywords :
UHF filters; band-pass filters; microwave filters; resonator filters; balanced dual-band bandpass filter; common-mode equivalent half circuits; common-mode suppression level; coupled stepped-impedance resonators; differential-mode equivalent half circuits; dual-band differential-mode bandpass response; frequency 2.4 GHz; frequency 5 GHz; Balanced; bandpass filter; coupled stepped-impedance resonator; dual-band; open-stub;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2009.2035954
