High-Gain Dual-Circularly Polarized Leaky-Wave Antenna for Point-to-Point Communications

In this letter, a high-gain low-profile dual-circularly polarized (CP) leaky-wave antenna (LWA) with fixed beam is presented. The proposed LWA comprises only two-layered substrates, in which the top layer constructs the annular LWA array while the bottom layer realizes the feeding network. To obtain the fixed beam, the differential excitation generated by the proposed coupler is employed. Furthermore, the dual-CP feeding network provides two sequentially rotated phase excitations for the slot coupler, then the dual-CP radiation with fixed beam is realized. The profile height of the proposal is only 0.15
λ
₀
at 28 GHz, while the measured peak gain is up to 27.2 dBic; this could be attractive for point-to-point communications.