Novel Bull's Eye Antenna at Ku Band With Enhanced Gain Bandwidth

In this work, a novel corrugated metallic unit cell is proposed towards the bandwidth enhancement of a microwave Bull's Eye antenna. Conventional realizations of Bull's Eye antennas use mostly standard shaped rectangular unit cells and although they offer a variety of advantages, they suffer of limited gain bandwidth. The proposed model in this work operates at the Ku band and achieves a maximum gain of 17.3 dBi and a fractional 3-dB gain bandwidth of 15.7 %, outperfoming standard shaped Bull's Eye antennas of the same size and gain. The radiation patterns of this antenna exhibit a highly directive lobe and maintain a good side lobe level at all angles.