Title :
Tri-band bandpass filter using stub loaded resonators
Author :
Chen, F.C. ; Chu, Q.X. ; Tu, Z.-H.
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou
Abstract :
A tri-band bandpass filter using short and open stubs loaded resonators is presented. The first and the third passband frequencies of the tri-band filter can be flexibly controlled by tuning the lengths of the stubs, whereas the second passband frequency is fixed. A tri-band filter has been implemented with four transmission zeros, the filter has good tri-passband performance at 1.57, 2.4, 3.5 GHz measured results agree well with simulated ones.
Keywords :
UHF filters; band-pass filters; circuit tuning; microwave filters; poles and zeros; radiocommunication; resonator filters; fixed second passband frequency; frequency 1.57 GHz; frequency 2.4 GHz; frequency 3.5 GHz; stub length tuning; stub loaded resonators; transmission zeros; tri-band bandpass filter; tri-passband performance;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081054
