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Chinese Journal of Engineering
Volume 2014 (2014), Article ID 379073, 7 pages
Research Article

Broadband Semielliptical Patch Antenna with Semicircular Ring Slot for WiMax Application

1Microwave Laboratory, Department of Physics, University of Rajasthan, Jaipur 302004, India
2Department of Physics, Government Mahila Engineering College, Ajmer 305002, India
3Department of Physics, S.S. Jain Subodh P.G. College, Jaipur 302004, India

Received 24 January 2014; Revised 24 April 2014; Accepted 20 May 2014; Published 19 June 2014

Academic Editor: Samuel Ver Hoeye

Copyright © 2014 Brajraj Shrama et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper reports the design and analysis of a semielliptical patch antenna modified by cutting semicircular ring slot in patch geometry and obtained results are discussed. The reported antenna is designed on a multilayered substrate material having two glass epoxy FR-4 substrates separated by a thin foam substrate having thickness 1.0 mm. The size of ground plane is 75 m 5 mm, whereas the patch dimension along major and minor axes is 23.0 mm and 14.0 mm, respectively. The two modes corresponding to resonance frequencies 3.39 GHz and 3.73 GHz are excited to provide wide impedance bandwidth 21.1% with respect to central frequency with stable radiation patterns. The antenna shows circular polarization with axial ratio bandwidth 5.5% and minimum axial ratio value 1.65 dBi. The radiation patterns of proposed antenna are normal to the surface of patch and are almost identical in shape as required for practical applications. The proposed antenna covers entire median band of WiMax communication systems ranges from 3.40 GHz to 3.6 GHz.