Abstract
This article evaluates the multi-functional characteristics of dumbbell-shaped Defected Ground Structure (DGS) embedded with microstrip patch antenna for various wireless applications. To validate the effects of DGS like antenna size reduction and higher order harmonics suppression, the ground plane defects distinctly at different positions beneath the substrate, and later the structure is optimized. Finally, different design parameters of DGS are varied separately over a wide range to find control over the performance of DGS. All the antennas are designed to operate at 2.4 GHz frequency on a Rogers RT/duroid 5880 (tm) substrate material with a dielectric constant of 2.2 and a height of 1.5 mm. All the structures are designed using ANSYS HFSS, and their performance parameters are evaluated and analyzed in terms of return loss, VSWR, gain and radiation patterns. The proposed DGS antennas and its array can find extensive application in ISM band wireless communications.
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