Design of Metasurface for performance improvement of feed source

The three dimensional meta-structure is proposed in this article, which shows increased performance in the feed source in terms of directivity, gain and the side lobe level. The proposed antenna has the advantages of low profile while maintaining the fixed flare angle of the feed horn, thus supports constant aperture dimension where the phase variation is decreased from 316.27° with horn feed only condition to 19.54° with the placement of proposed prototype above the horn feed. Using numerical simu-lation various key parameters i.e. radiation patterns, directivity, gain, phase variation and side lobe levels have been computed. Results show that at design frequency of 12 GHz, the computed directivity, gain, side lobe level in H- and E- planes are 20.5 dB, 20.5 dB, −26.5 dB and −12.4 dB with only horn case and with proposed prototype placed above the horn these values improved to 22.1 dB, 21.9 dB, −15.5 dB and −17.5 dB respectively.