Cylindrical conformal broadband array antenna based on defective ground structure

The existing cylindrical conformal ultra-wideband antennas are mostly unit antennas, although the working bandwidth is wider, the gain is low. When the array antenna is conformal on the surface of the cylinder, the working bandwidth is narrowed because of the deformation of the array antenna. To solve this problem, a cylindrical conformal array antenna based on rectangular defective ground structure(DGS) is proposed in this paper. The antenna is designed as a cylindrical conformal wideband array antenna with a center frequency of 10 GHz, which broadens the bandwidth by loading rectangular defective ground structures on the backplane. The simulation results show that the bandwidth of the cylindrical conformal array antenna increases from 0.2GHz to 1.6GHz after loading the rectangular defective ground structure, and the gain of the antenna increases from 12.3dB to 14.1dB. The operating frequency bandwidth of the conformal array antenna is effectively increased without adding the thickness of the dielectric layer, which is more advantageous for miniaturization and integration of the array antenna.