Title :
Tri-Band Bandpass Filter With Sharp Passband Skirts Designed Using Tri-Section SIRs
Author :
Hsu, Chung-I G. ; Lee, Ching-Her ; Hsieh, Yi-Huan
Author_Institution :
Da-Yeh Univ., Changhua
Abstract :
This letter presents a second-order tri-band bandpass filter (BPF) designed using tri-section stepped-impedance resonators (TSSIRs). The impedance ratios of the TSSIRs were computed using the formulas expressed as functions of the passband center frequencies, which are located at 1.57, 2.45, and 3.5 GHz. A cross-coupled configuration was arranged to sharpen the passband skirts. The newly designed tri-band BPF was verified by circuit implementation and very good agreement between the simulated and measured results was observed.
Keywords :
UHF filters; band-pass filters; microstrip filters; microwave filters; transceivers; frequency 1.57 GHz; frequency 2.45 GHz; frequency 3.5 GHz; multiband multimode wireless-communication systems; sharp passband skirts; tri-band bandpass filter; tri-section stepped-impedance resonators; Band pass filters; Circuit simulation; Computational modeling; Global Positioning System; Impedance; Microstrip filters; Microstrip resonators; Passband; Resonant frequency; Transceivers; Tri-band microstrip bandpass filter (BPF); tri-section stepped-impedance resonator (TSSIR);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.911976
