Development a Wideband ESIW H - Plane Horn Antenna with Improved Radiation Performance

In this paper a wideband H-plane horn antenna using empty substrate integrated waveguide (ESIW) is introduced. In the proposed structure, the dielectric inside the antenna is completely removed and so, the waveguide losses are reduced and antenna radiation efficiency is increased. Adding a non-radiation slot on the top side of the antenna structure and an extra layer behind it, in addition to preserving the antenna profile, would increase the impedance bandwidth up to 4.3 GHz. Moreover, adding a metallic reflector plate at the radiating aperture of the antenna, improves antenna gain and Side Lobe Level (SLL). The antenna provides 16.4 % impedance bandwidth from 28 GHz up to 33 GHz. In the generated bandwidth, the antenna gain is among 7.3 dBi to 11.7 dBi and radiation efficiency is at least 96%.