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Compact dual bandpass filter for terrestrial radio and GSM applications
Author(s) -
Killamsetty Vinay Kumar,
Mukherjee Biswajeet
Publication year - 2017
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21131
Subject(s) - stopband , band pass filter , resonator , stub (electronics) , passband , electronic engineering , physics , materials science , acoustics , optoelectronics , optics , engineering
Abstract A Compact Dual Band‐Bandpass Filter (DB‐BPF) with wide stopband rejection is proposed in this article. The basic tools used in the structure are Short Circuited Stepped Impedance Resonators (SCSIR), Open Stub Resonators (OSR). First, a Single Band‐Bandpass Filter (SB‐BPF) is designed with wide stopband rejection, and then it is modified to DB‐BPF. Both the SB‐BPF and DB‐BPFs have similar type of construction except for an additional SCSIRs used in DB filter. The structure of the filters, use the source‐load coupling and OSR to generate transmission zeros, which suppresses harmonics and achieves wide stopband. The use of SCSIRs make the SB and DB bandpass filters size compact to 0.099λ g ×0.094λ g and 0.118λ g ×0.092λ g , where λ g is guided wavelength with a wide stopband upto 6.85 f 0 with 22 dB suppression for SB‐BPF and 2.78 f 1 /7.57 f 0 with 22 dB suppression for DB‐BPF, where f 0 and f 1 are centre frequencies of first and second passbands respectively.