Open AccessDual‐band band‐stop microstrip filter with controllable bands based on unequal split ring resonators
Author(s) -
CastilloAraníbar Patricia,
GarcaLampérez Alejandro,
LlorenteRomano Sergio,
SegoviaVargas Daniel
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5926
Subject(s) - resonator , split ring resonator , bandwidth (computing) , ground plane , coupling coefficient of resonators , multi band device , resonance (particle physics) , microstrip , stopband , band pass filter , coupling (piping) , physics , out of band management , quality (philosophy) , optics , materials science , computer science , engineering , electrical engineering , telecommunications , atomic physics , antenna (radio) , network architecture , computer security , quantum mechanics , metallurgy , network management station
In this study, a dual band band‐stop filter based on split ring resonators (SRR) over a ground plane with unequal rings is proposed and characterised. The proposed SRR design method, which is demonstrated here, ensures the control of the resonance frequencies and their respective bandwidths. The lengths and coupling regions of each ring are arbitrary, making possible the control of, not only the separation between the two generated resonances, but also the bandwidth ratio between the pass‐bands, or quality factors. The full characterisation of the resonators involves the computation of the resonant frequencies and the current distributions at the resonances. These current distributions are used to obtain the electromagnetic energy stored in the resonator that, in turn, is required to estimate the quality factor of each resonance. The dual band band‐stop filter is composed by four proposed SRRs coupled to a transmission line showing that, indeed, both the centre frequencies and its bandwidth ratio can be controlled. The presented results confirm the reliability of the proposed method in the design of passive devices.