“…In the millimeter-Wave frequency band where atmospheric propagation and resistive losses are large [13,14], high-gain antenna types can be used to solve this phenomenon [5,7]. Horn antennas in wireless communication systems and radar systems [1,4] are widely used because of their large gain [5,13,15] and high efficiency [16]. Horn antennas are characterized by their simple structure [13], easy control [5,17], high efficiency, stable radiation direction [15,18], moderate bandwidth [13,15,[17][18][19], and powerful power processing capabilities [13], is widely used in the energy supply of tracking satellite, systems of phased array, devices of microwave heating, and as general standard components for calibrating and measuring high-gain antennas [17].…”