Title :
Design of a New Tri-Band Microstrip BPF Using Combined Quarter-Wavelength SIRs
Author :
Lee, Ching-Her ; Hsu, Chung-I G. ; Jhuang, He-Kai
Author_Institution :
Dept. of Electron. Eng., Nat. Changhua Univ. of Educ.
Abstract :
A new tri-band microstrip bandpass filter (BPF) is designed to produce three passbands at the commercially practical frequencies through a single piece of filter circuitry. The basic component used to build the proposed filter consists of two quarter-wavelength (lambda/4) stepped-impedance resonators (SIRs). One of the lambda/4 SIRs is designed to operate at 1.57 GHz and 5.25 GHz, and the other at 2.45 GHz. The feed positions for the two lambda/4 SIRs are carefully located to have the same distance from the via-hole ground and meanwhile to give the required external quality factors (Qe´s). In such a way, the microstripline sections between the via-hole and each of the feed positions can be combined into one to simplify the filter structure, and to reduce the BPF circuit size. Performance of the newly designed tri-band BPF is verified by measured results
Keywords :
UHF filters; band-pass filters; microstrip filters; microstrip lines; microwave filters; resonator filters; 1.57 GHz; 2.45 GHz; 5.25 GHz; external quality factors; filter circuit; microstrip line sections; quarter-wavelength stepped-impedance resonators; tri-band microstrip bandpass filter; Band pass filters; Circuits; Communication standards; Dual band; Feeds; Microstrip filters; Mobile communication; Radio frequency; Resonator filters; Wireless LAN; Anti-parallel coupled line; stepped-impedance resonator (SIR); tri-band microstrip bandpass filter (BPF);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.884902
