A Broadband Multi-Beam Dual-Circularly Polarized Reflect-Array for Ka-Band Application

In this paper, we proposed a multi-beam dual-circularly polarized (dual-CP) reflect-array (RA) antenna for Ka-band application. Two reflection beams fed by the right-handed (RH) CP horn point to $\theta _{\mathrm {R}}=3.5^{\circ }$ and {R}}= -3.5^{\circ at R-plane, two left-handed (LH) LHCP {L}}=3.5^{\circ {L}}= L-plane 30 GHz. There is null between co-polarization distinguish them. The plane composed of circuit board with size 160 mm notation="LaTeX">$\times $ 0.762 1304 RA cells printed on it metal plate. have different phases 4 mm, based multi-resonant structure, designed diamonds arrows. Measured results show that beam directions obtained feeding RHCP are same as design directions. peak gain co-polarized very close, 3-dB bandwidth (BW) about 25%, 2-dB axial ratio (AR) BW up 40%, which has broad application prospects in long-distance high-precision communication.