JCS_V4_N3_RP2 Rajeewa Kumar Jaisawal Arvind Pandey R.K. Chauhan Journal on Communication Engineering and Systems 2277-5242 4 3 9 14 Trident, GSM, HFSS, Microstrip Antenna, Wideband Antenna In this paper, a modified trident shaped circularly polarized microstrip patch antenna of dimension 35x65 mm is presented which can be used in GSM, radar , satellite and wide band application. The dielectric substrate FR4_ epoxy used in this antenna has relative permittivity of 4.4 and dielectric loss tangent of 0.02. There are five resonance frequencies obtained at 1.78,6.56,8.12,9.36 and 11.78 GHz and impedance bandwidth calculated at these frequency bands are 18.17% (1.9392-1.6161), 1.192% (6.6095-6.5312), 19.40% (8.12-9.36), 6.59% (12.22-11.44) respectively, while simulating this antenna on High Frequency Structure Simulator (HFSS) tool. May - July 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3451&issueid=0