Microstrip-Fed 3D-Printed H-Sectorial Horn Phased Array

A 3D-printed phased array consisting of four H-Sectorial horn antennas of 200 g weight with an ultra-wideband rectangular-waveguide-to-microstrip-line transition operating over the whole LMDS and K bands (24.25–29.5 GHz) is presented. The transition is based on exciting three overlapped transversal patches that radiate into the waveguide. The transition provides very low insertion losses, ranging from 0.30 dB to 0.67 dB over the whole band of operation (23.5–30.4 GHz). The measured fractional bandwidth of the phased array including the transition was 20.8% (24.75–30.3 GHz). The antenna was measured for six different scanning angles corresponding to six different progressive phases [Formula: see text] , ranging from 0° to 140° at the central frequency band of operation of 26.5 GHz. The maximum gain was found in the broadside direction [Formula: see text] = 0°, with 15.2 dB and efficiency [Formula: see text] = 78.5%, while the minimum was found for [Formula: see text] = 140°, with 13.7 dB and [Formula: see text] = 91.2%.