$W$-Band Additively Manufactured Geodesic $H$-Plane Horn Antenna

We present a compact geodesic <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$H$</tex> -plane horn antenna for point-to-point communications at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$W$</tex> -band. The horn has a curved height profile with truncated corners to reduce phase errors and achieve high gain and aperture efficiency. The laser powder-bed fusion additive manufacturing technique is applied to fabricate the horn antenna in a monolithic manner. The resulting prototype has a weight of only 14 g including the flange part. In the operating band from 75 to 110 GHz, the measured reflection coefficient is below -15 dB in almost the entire band and agrees well with the expectations from the simulation. The simulation shows a realized gain of 20 dBi with an aperture efficiency of 80% and a total efficiency of nearly 80%.