Design and Development of High-Gain SIW H-Plane Horn Antenna Loaded With Waveguide, Dipole Array, and Reflector Nails Using Thin Substrate

In this communication, a new probe-fed substrate integrated waveguide (SIW) H-plane horn antenna including three linear dipole arrays is proposed. To feed the dipole arrays, a portion of a rectangular waveguide is placed at the front of the radiating aperture of the SIW horn in conjunction with two slots, which are etched at the top and bottom of the substrate. A row of reflector nails is also added to reduce the backward radiation and to improve the antenna gain. A prototype of the proposed antenna is fabricated using the printed circuit board process. The proposed antenna is numerically investigated by a software package. The simulated and measured results are reported for verification. The measured results show that the proposed antenna provides 13.97 dBi gain at 20.5 GHz with a low backward radiation.