Low Profile Dual-Band Dual-Polarized Transmitarray Antenna for Satellite Communications

A novel dual-band dual-polarized transmitarray antenna is presented. The antenna consists of 5 layers printed circuit board. At variance of previous designs, the proposed configuration is conceived without using air gaps; this leads to a low-profile structure. The designed unit-cell is dual polarized, and it works at 20 and 30 GHz exploiting an interleaved lattice configuration. At both bands, the phase of the transmitted field can be controlled in a range of 300 degrees, within a transmission loss above 3.5 dB. In order to validate the design, an 87×87 mm
²
transmitarray has been analysed with a maximum gain of 21.3 and 23 dB, respectively, at 20 and 30 GHz corresponding to an aperture efficiency of 33 and 25%. The -1dB gain bandwidth is 4.2 % for both bands.