Gain and Beamwidth Enhancement of SIW Sectoral Horn antenna for Ka-Band Application

Traditional H-plane sectoral horn antennas have flaring only in the direction of the H-field. As there is no flaring in the direction of the E-field, a fan-beam radiation characteristics is achievable from the H-plane sectoral horn antenna. Reduction of E-plane beamwidth is possible by placing parasitic elements like directors, reflectors at a proper distance from the radiating aperture of the SIW horn antenna that will lead to the improvement of E-plane beam-width as well as the antenna gain. In this communication, a novel multilayer H-plane sectoral horn antenna has been introduced for Ka-Band application with few attractive radiation characteristics like less beam-width in both principle plane, high gain, wide-bandwidth while maintaining low profile. In the proposed design, the dielectric substrate is extended in front of the radiating aperture and four vertical directors were placed by embedding metallic via hole at a proper distance from the radiating aperture. Also two rows of metallic via reflectors are placed at the back side of the radiating aperture to direct the radiated energy in the desired direction. Simulation result indicates that the proposed antenna maintains less E-plane and H-Plane beam-width and nearly constant peak radiating gain between 8 dBi to 11 dBi in end-fire direction along with a -10 dB impedance bandwidth of 1 GHz.