Title :
Tunable Bandstop Defected Ground Structure Resonator Using Reconfigurable Dumbbell-Shaped Coplanar Waveguide
Author :
Safwat, Amr M E ; Podevin, Florence ; Ferrari, Philippe ; Vilcot, Anne
Author_Institution :
Fac. of Eng., Ain Shams Univ., Cairo
Abstract :
A modification of the conventional dumbbell-shaped coplanar waveguide defected ground structure (DGS) is proposed. This modification permits the continuous tuning of the rejected frequencies by using reconfiguration technique and it allows the control of the DGS equivalent-circuit model. The modified DGS possesses two-dimensional symmetry, hence, it has been studied under different symmetry conditions and the corresponding equivalent-circuit model in each case has been developed. Based upon this study, a tunable bandstop DGS resonator is proposed. 19% tuning range centered at 3.7 and 7.4 GHz, respectively, is achieved. The equivalent-circuit model of the resonator is also developed. All proposed structures have been fabricated. Measurements as well as three-dimensional simulations are found to be in a very good agreement with theoretical predictions
Keywords :
band-stop filters; coplanar waveguides; resonator filters; 2D symmetry; 3.7 GHz; 7.4 GHz; defected ground structure; equivalent-circuit model; reconfigurable coplanar waveguide; tunable bandstop resonator; Coplanar waveguides; Etching; Filters; Frequency; Microstrip; Periodic structures; Predictive models; Tunable circuits and devices; Tuning; Two dimensional displays; Coplanar waveguide (CPW); defected ground structure (DGS); tunable bandstop resonator;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.880654
