Title :
Dual-Band Bandpass Filter With Wide Stopband Using One Stepped-Impedance Ring Resonator With Shorted Stubs
Author :
Jin Shi ; Longlong Lin ; Jian-Xin Chen ; Hui Chu ; Xu Wu
Author_Institution :
Sch. of Electron. & Inf., Nantong Univ., Nantong, China
Abstract :
A novel stepped-impedance ring resonator (SIRR) with two pairs of shorted stubs is proposed to design a dual-band bandpass filter. The proposed resonator is a quad-mode resonator, and one resonator can realize a dual-band filter. The frequency space between two passbands and bandwidths of two passbands can be controlled by the shorted stubs. Wide out-of-band rejection can be achieved by selecting the desired impedance and length ratios and suitable feeding point to suppress some spurious resonant frequencies. A prototype filter centered at 1.395 and 1.825 GHz is designed with the first spurious response occurring at 7.84 GHz or 5.7f01 ( f01 is the center frequency of the first passband). Good agreement between the simulated and measured results can be observed.
Keywords :
UHF filters; band-pass filters; band-stop filters; microwave filters; resonator filters; SIRR; dual-band bandpass filter; feeding point; frequency 1.395 GHz; frequency 1.825 GHz; frequency 7.84 GHz; frequency space; quad-mode resonator; shorted stubs; stepped-impedance ring resonator; wide out-of-band rejection; wide stopband; Band-pass filters; Dual band; Equivalent circuits; Optical ring resonators; Passband; Resonant frequency; Wireless communication; Dual-band bandpass filter (BPF); quad-mode resonator; shorted stubs; stepped-impedance ring resonator (SIRR); wide stopband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2014.2316259
