Microstrip antenna embedded with circular split ring resonator for WLAN applications

Abstract

This paper presents a design methodology for producing a probe feed patch antenna embedded with circular split ring resonator using Ansoft HFSS design environment. A co-axial probe feed is used to excite the patch antenna since it exhibits a low spurious radiation and is easy to match. In general, to achieve size reduction the slots are cut in a rectangular patch which ultimately leads to the impedance mismatch. Therefore a circular split ring resonator is embedded inside the slot. A sub-wave length resonance can be accomplished with a good impedance match, return loss, VSWR and antenna gain due to the geometry of circular split ring resonator. It is evident from the results that the proposed antenna designed on Rogers RT/duroid 5880, resonates at 5.9 GHz with a gain of 6.2dBi, VSWR 1.1 and return loss −33.2dB.