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Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips
Author(s) -
Choudhary Dilip Kumar,
Chaudhary Raghvendra Kumar
Publication year - 2021
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.22809
Subject(s) - resonator , band pass filter , passband , strips , coupling coefficient of resonators , split ring resonator , materials science , stub (electronics) , multi band device , optoelectronics , optics , physics , electronic engineering , telecommunications , computer science , engineering , composite material , antenna (radio)
A miniaturized bandpass filter of quad‐band response with high selectivity is reported in this paper. The developed filter utilizes two sets of symmetric open‐ended split‐ring resonators (SRR), L‐ shaped and C ‐shaped strips along with rectangular stubs. Initially, open‐ended SRR is connected with a C ‐shaped metallic strip to serves as a dual passband filter. Then by adding another SRR along with L ‐shape metallic strip and rectangular stub, it was converted into triple band and quad‐band respectively. The operating frequency of the proposed filter structure can be controlled with the variation in the length ratio of resonators. In addition, transmission zero can be increased because of coupling between source/load and resonators which improves selectivity. The quad‐band bandpass filter operates at 0.6/1.1/2.25/3.1 GHz, along with 3‐dB fractional bandwidths of 17.9% (0.56‐0.67 GHz), 17.7% (1.03‐1.23 GHz), 5.8% (2.20‐2.33 GHz), and 13.3% (2.88‐3.29 GHz). It offers compactness with an electrical footprint area of 0.11λ g × 0.10λ g (23.5 mm × 21.0 mm) without feedline, where λ g denotes the guided wavelength at 0.6 GHz. The measured and simulated outcomes were in virtuous correlation.