Open AccessWidth‐varying conductor‐backed coplanar waveguide‐based low‐pass filter with a constant signal trace to adjacent grounds separation
Author(s) -
Al Shamaileh Khair A.,
Dib Nihad I.,
Abushamleh Said A.
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.2018.5394
Subject(s) - stopband , passband , cutoff frequency , conductor , signal (programming language) , low pass filter , coplanar waveguide , filter (signal processing) , transmission (telecommunications) , constant (computer programming) , band pass filter , waveguide , propagation constant , optics , physics , materials science , computer science , engineering , telecommunications , electrical engineering , microwave , composite material , programming language
In this study, the authors introduce a new and systematic procedure for the design and optimisation of a conductor‐backed coplanar waveguide low‐pass filter (LPF). The width of the centre conductor (i.e. signal trace) is modelled in a truncated Fourier series, whereas the gap to the adjacent grounds is maintained constant relative to the width variation. Transmission lines theory is adopted to model the LPF and establish an optimisation setup. Three optimisation techniques; namely, trust‐region‐reflective algorithm, symbiotic organism search, and genetic algorithm are investigated to minimise the developed bound‐constrained non‐linear objective function. To verify the proposed procedure, an LPF with a cutoff frequency of 2 GHz is optimised, simulated, and measured. The transmission parameter in the passband is found to be in the range −0.3 ± 0.1 dB, and better than −30 dB in the stopband.