Back Radiation Suppression for Substrate Integrated H-Plane Horn Antenna

A new multi-layer antenna structure including simple substrate integrated H-plane horn antenna with a couple of soft surfaces is introduced. The planar strip-via soft surfaces are located at top and bottom of the substrate integrated horn to stop the aperture radiated waves contributing to antenna back radiation. The new antenna structure exhibits more than 13 dB improvement in front-to-back ratio at design frequency when compared to simple substrate integrated H-plane horn antenna.