Abstract
In this paper, band-pass fllters based on the microstrip conflguration and utilizing coupled defected ground structures are presented. The 50› microstrip line has a gap discontinuity in the middle and characterized by stepped impedance resonators on either half. The four fractal geometries tested for defected ground are the flrst and second iterations of the modifled Moore curve, the closed staircase curve and a dual concentric closed staircase curve. The fllters have a compact size and planar geometry. The modifled Moore flrst iteration has a measured pass band from 2.27GHz to 11.86GHz, whereas the second iteration has a measured pass band from 1.85GHz to 6.71GHz. The measured pass band of the closed staircase fllter is from 2.38GHz to 7.21GHz. The dual-concentric closed-staircase DGS fllter ofiers a dual-band response with the measured pass band being from 2.41GHz to 5.01GHz and from 5.81GHz to 8.35GHz. All the fllters can have applications in the UWB region. A parametric study showing the efiect of the various controlling parameters is also presented.
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