Title :
Compact Dual-Band Filter Using Defected Stepped Impedance Resonator
Author :
Wu, Bian ; Liang, Chang-Hong ; Qin, Pei-Yuan ; Li, Qi
Author_Institution :
Nat. Key Lab. of Antennas & Microwave Technol., Xidian Univ., Xi´´an
Abstract :
This letter presents a novel approach for designing a dual-band bandpass filter by using defected stepped impedance resonator (DSIR). The resonant frequency of the DSIR is found to be much lower than that of the conventional microstrip stepped impedance resonator (SIR), which reduces the circuit size effectively. Two types of second-order DSIR microstrip bandpass filter operating at 1.85 and 2.35 GHz, respectively, are well designed according to the classical theory of coupled resonator filter. Then they are combined to construct a compact dual-band filter with a common parallel microstrip feed line, the measurement results of the fabricated filter have a good agreement with the simulation.
Keywords :
band-pass filters; microstrip lines; microstrip resonators; network synthesis; resonator filters; bandpass filter; classical theory; compact dual-band filter; coupled resonator filter; defected stepped impedance resonator; microstrip filter; microstrip resonator; parallel microstrip feed line; resonant frequency; Band pass filters; Coupling circuits; Dual band; Feeds; Impedance; Microstrip filters; Microstrip resonators; RLC circuits; Resonant frequency; Resonator filters; Bandpass filter; compact size; defected stepped impedance resonator (DSIR); dual-band;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.2003459
