Rectangular horn antennas with limiting plates for symmetrical pattern and beam efficiency improvement

Abstract

This paper proposes a horn antenna with limiting plates inside to produce symmetrical pattern in E-plane and H-plane. Sidelobes of the antenna are reduced using the limiting plates,and therefore,the beam efficiency of the antenna is improved up to 90% without changing the antenna dimensions. The antenna dimensions are adjusted to achieve the best beam efficiency. Simultaneously,the reflection coefficient is maintained lower than -15 dB. In addition,it is indicated that this antenna has wide bandwidths without reducing the efficiency and performance of the antenna. Finally,the reflection coefficient is improved to -20 dB without degradation of the antenna performance.