JCS_V4_N2_RP3 Rajeewa Kumar Jaisawal Arvind Pandey R.K. Chauhan Journal on Communication Engineering and Systems 2277-5242 4 2 12 16 E –shape Patch, Circular Polarization, ADS, Defected Ground Structures, Microstrip Antenna, Axial Ratio In this paper, a new technique is proposed to achieve size reduction of microstrip patch antenna using Defected ground microstrip patch antenna. The technique is based on etching out two rectangular slots from the metallic ground plane beneath the complementary of the patch antenna. To achieve circular polarization a probe feed with different axial ratio has been proposed. Due to unequal axial ratio of 1:2 asymmetry is introduced. The slot length is used to optimize the resonant frequency. The validity of the concept is demonstrated by considering two resonance frequencies which are 2 obtained at 2.4 GHz and 2 GHz. The proposed antenna dimension is 40x70 mm . The dielectric substrate FR4_epoxy of relative permittivity 4.4 and dielectric loss tangent 0.02 is used for simulating the results. The simulation is done on Advanced Design System (ADS) version 11. February - April 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3340