Open AccessNew π –T generalised metamaterial negative refractive index transmission line for a compact coplanar waveguide triple band pass filter applications
Author(s) -
Fouad Mohammed A.,
Abdalla Mahmoud Abdelrahman
Publication year - 2014
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.2013.0698
Subject(s) - coplanar waveguide , metamaterial , transmission line , physics , passband , filter (signal processing) , equivalent circuit , electric power transmission , electromagnetic simulation , optics , microwave , waveguide filter , waveguide , band pass filter , electronic engineering , topology (electrical circuits) , low pass filter , computer science , engineering , prototype filter , electrical engineering , telecommunications , quantum mechanics , voltage
This study presents, for the first time, a novel π − T generalised negative refractive index (NRI) transmission line (TL) configuration. It is innovated for increasing the possible passbands in designing microwave components. It is proved that the proposed transmission line can introduce up to seven passbands for completely unbalanced transmission line condition. The detailed mathematical analysis of that configuration based on the periodic network analysis and equivalent circuit model is introduced. As an application for the novel π − T generalised NRI TL configuration, a new compact triple band coplanar waveguide (CPW) metamaterial filter is introduced. The proposed triple bands CPW filter design steps are introduced and its performance is validated using equivalent circuit model simulation, electromagnetic full wave simulation and experimental measurements. Good agreements between the circuit modelling, electromagnetic full wave simulation and practical measurement results are achieved. All the results confirm that the proposed filter has triple passbands from 900 to 960 MHz, 1.4 to 1.48 GHz and 2.4 to 2.45 GHz. Moreover the filter size is compact whose length is only 12.1% λ g at first passbands, 18.2 λ g % at second passbands and 31.7 λ g % at third passbands.