Dual-Band, Miniaturized, Enhanced-Gain Patch Antennas Using Differentially-Loaded Metastructures

Abstract

We propose a novel miniaturized dual-band microstrip patch antenna with improved gain for potential wireless applications. Two variants of the proposed configuration have been optimized and the analyzed results presented. The basic patch antenna is loaded with two pairs of Complementary Split Ring Resonators (CSRR\'s) on both sides of its non-radiating edges with different dimensions on both sides. The radiation performance of the first variant and its gain is further improved by etching four pairs of CSRR on the ground plane which controls the surface waves effectively. The proposed antenna shows an analyzed gain of 1.80 & 5.67 dB respectively in the two bands 1.68, 2.59 GHz. The antenna may find application in both the ISM (L band) and Wimax applications. In a second variant, the gain is further improved by employing a Reactive Impedance Surface (RIS). In this case, the analyzed gain is found to be 5.69 & 5.12 dB respectively at 2.05, 2.39 GHz. This antenna may be suitable for UMTS and ISM applications. The design dimensions of the patch, CSRR\'s and the RIS are obtained from expressions available in literature. Subsequently, simulation and optimization of the structures is carried out with Ansys HFSS®; a benchmarked E.M. simulator. The analyzed results are presented. Keywords: Complementary Split Ring Resonator (CSRR), Metastructures, Miniaturization, Reactive Impedance Surface (RIS)