A Compact Pentagonal Ring CPW-Fed Zeroth Order Resonating Antenna with Gain Enhancement

Abstract

AbstractIn this work, a pentagonal ring CPW-fed zeroth order resonating (ZOR) antenna with gain enhancement is proposed. Gain enhancement is achieved by means of electromagnetic bandgap structures (EBG) loaded on patch. The proposed antenna is operated in series resonant mode, therefore resonance frequency is dominated by series parameters of the conventional CRLH transmission line. The antenna comprises of a circular patch which is imposed by interdigital capacitor and EBG structures. Meandered line inductor is connected between patch and pentagonal ground plane in order to ensure miniaturization using CRLH resonant approach. Measurement results shows that proposed antenna offers ZOR resonance at 2.7 GHz with 4.81 %, 10 dB fractional bandwidth. The antenna offers simulated gain of 1.63 dBi and 80.6 % radiation efficiency at ZOR frequency. Surface current distribution shows that how these CRLH – TL components responsible for origination of ZOR mode. Proposed antenna exhibits excellent radiation patterns with cross polarization level of −53 dB in the boresight direction.