Groove Gap Waveguide H-plane Horn Antennas with Enhanced Radiation Characteristics

Considering the wide application of fan-beam antennas, this paper is focused on the improvement of the radiation gain and the operating bandwidth of H-plane sectoral horn antennas in groove gap waveguide technology. It is demonstrated that by modifying the aperture of the horn a very good impedance matching and high gain over a wide frequency band from 13 GHz to 20 GHz can be achieved. The proposed method also improves the front-to-back ratio radiation of the antenna. Moreover, it is shown that the radiation gain of the antenna can be mechanically adjusted by loading the antenna with slabs of dielectric materials.