VSAT和USAT站天线性能设计目标及其局限性

Design objects and limitations of antenna for VSAT and USAT earth station

摘要: 简述了甚小口径天线终端（very small aperture terminal，VSAT）和超小口径天线终端（ultra small aperture terminal，USAT）站天线口径的划分及等效口径的计算方法.系统介绍了VSAT和USAT站天线性能的设计目标，即天线方向图的旁瓣特性、交叉极化特性和偏轴等效各向同性辐射功率.指出了VSAT和USAT站卫星通信天线性能设计目标的局限性，并提出了VSAT和USAT站天线方向图第一旁瓣电平要求的建议.

Abstract: In this paper，antenna aperture division and equivalent diameter calculation are described simply for very small apreture terminal (VSAT) and ultra small aperture terminal (USAT) earth station antenna.Design objects of VSAT and USAT earth station antenna introduced systematically，side-lobe characteristic of antenna pattern，cross polarization characteristic of antenna，and characteristic of offaxis equivalent isotropically radiated power (EIRP).Limitations of design objects are pointed for VSAT and USAT earth station antennas，and recommendation of antenna pattern first side-lobe level request is put forward for VSAT and USAT earth station.