Title :
A Controllable Bandwidth Filter Using Varactor-Loaded Metamaterial-Inspired Transmission Lines
Author :
Borja, Alejandro L. ; Carbonell, Jorge ; Martínez, Jorge D. ; Boria, Vicente E. ; Lippens, Didier
Author_Institution :
E.U. Politec. de Cuenca, Univ. de Castilla La Mancha, Cuenca, Spain
fDate :
7/3/1905 12:00:00 AM
Abstract :
This letter presents a tunable bandwidth bandpass filter based on varactor-loaded metamaterial coplanar waveguide (CPW) lines. The CPW lines are based on series gaps and split-ring resonators. The varactors are reverse-biased semiconductor diodes connected between both sides of each series gap. This configuration, directly inspired from the so-called metamaterial technology, takes advantage of the high dispersion of the loaded transmission line. Therefore, strong permittivity and permeability responses induced by means of the resonators are obtained. A single varactor-loaded transmission line is first analyzed. Then, a third-order tunable filter with fractional bandwidth tuning range from 5.8% to 21.5% is experimentally assessed. The proposed filters can be used in several practical applications such as multichannel wireless and satellite communication systems, where reconfigurable devices are often required.
Keywords :
band-pass filters; coplanar waveguides; metamaterials; telecommunication transmission lines; varactors; CPW lines; controllable bandwidth filter; metamaterial technology; reverse biased semiconductor diodes; series gaps; split ring resonators; tunable bandwidth bandpass filter; varactor loaded metamaterial coplanar waveguide lines; varactor loaded metamaterial inspired transmission lines; Band pass filters; Capacitance; Coplanar waveguides; Metamaterials; Resonator filters; Tunable circuits and devices; Varactors; Coplanar waveguides (CPWs); metamaterial; planar filters; split-ring resonators (SRRs); tunable devices;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2012.2183111
