An Open-Ended Rectangular Waveguide Antenna with Metasurface at Ka-band

A compact antenna with low-profile is proposed in this paper. The antenna is composed of a layer of metasurface and a rectangular waveguide flange. Two stairs are carved on the broad walls of waveguide for impedance matching. The metasurface of 4×4 square patches and the electromagnetic band gap of mushroom structures based on Rogers RO4003C are introduced for radiation pattern improvement. The simulated return loss is better than 10dB between 29.1GHz and 32.5GHz. Good radiation characteristics are realized in the operating band.