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Dual-Band Bandpass Filter With Wide Stopband Using One Stepped-Impedance Ring Resonator With Shorted Stubs

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5 Author(s)
Jin Shi ; Sch. of Electron. & Inf., Nantong Univ., Nantong, China ; Longlong Lin ; Jian-Xin Chen ; Hui Chu
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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.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:24 ,  Issue: 7 )