Abstract
A new broadband millimeter-wave retlectarray antenna structure utilizing novel polarization insensitive multi resonant unit cells is proposed, The design frequency of the RA is set at 30 GHz, and it consists of 20x20 polarization independent insensitive resonant unit cells (UCs), which are illuminated by pyramidal horn antenna. The unit cell of this array contains two concentric rings combined with a cross loop and cross strips inside for bandwidth enhancement. For maximum aperture efficiency and realized gain, a pyramidal horn antenna placed at F to obtain F F/D = 0.4. The simulation results show that the obtained maximum gain is 23.8 dB with a slight variation over the operating frequency range and a good cross-polarization level.