A Wideband Dual-Band and Dual-Circularly-Polarized Wide-Angle Scanning Phased Array Antenna with Single-Port Feed at K-/Ka-Bands

A dual-band and dual-circularly-polarized phased array antenna is presented with the single-port feed for K-/Ka-bands satellite communication applications. To achieve the left-hand circular polarization (LHCP) in K-band and the right-hand circular polarization (RHCP) in Ka-band, the wideband and dual-polarized magnetoelectric-dipole (MED) is connected in series with the dual-band coupler. The dual-band coupler is carefully designed to achieve the amplitude and phase requirement for generating the circular polarization (CP) at K-/Ka-bands. Then, an
$\mathbf{8}\times \mathbf{8}$
phased array antenna consisting of the MED unit cells is designed and simulated. It shows an axial ratio (AR) lower than 4 dB within the scanning range of
$\pm \mathbf{55}^{\circ}$
, over these frequency bands from 17.7 GHz to 19.7 GHz and from 28 GHz to 30 GHz.