High Gain,Wideband and Circularly Polarized Patch Antenna for Maritime Radar Applications

In this paper, the design and simulation of an antenna with compact structure and high gain, proper bandwidth and circular polarization is presented. The proposed antenna due to it’s high-gain circular polarization is suitable for maritime radar applications in which multi-path interactions and reflection’s from sea surface is problematic. This antenna also has the ability to use in Weather Radar applications (5350MHZ-5450MHz), Radiolocation and Military applications (5470MHz-5570MHz). Here to increase the antenna gain, fabry perot theorem based on the use of a superstrate with dimensions of a wavelength and in distance of half wavelength at above of the antenna structure is used. In addition, to maximize the antenna gain, bandwidth and axial ratio, metallic walls surround the antenna structure. The results of the simulated antenna indicate maximum gain about 15 dB, a bandwidth of %18.7 and axial ratio of %11. Meanwhile, E and H patterns show the maximum side lobe of about 8 -10 dB.