Wideband Reconfigurable Polarization and Beam Sweeping Antenna for Satellite Applications

Abstract

A wideband antenna with polarization reconfigurable and beam sweeping capability has been presented in this paper which is very useful for the Fixed and mobile satellite systems working at Ka frequency band. Proposed antenna is having a impedance bandwidth of 5.36GHz covering the frequencies of 26.22GHz to 31.58GHz. Polarisation reconfiguration is possible by having two feed points which are fed to the patch in orthogonal directions. A feed network system is designed so as to regulate the power transferred to the patch from the feed and by exciting the patch with the appropriate feed polarisation reconfiguration and beam sweeping can be achieved. Proposed antenna is having a maximum gain of 5dB which is almost flat for the entire operating frequency range. Axial ratio of the proposed antenna is 3dB for single port excitation which represent circular polarisation. Proposed antenna is having a compact size of 11.6mm×10mm and is having a good isolation of -10dB  in between the two ports.