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作为卫星间光通讯系统的重要组成部分之一的发射和接收天线，将直接影响卫星间光通讯的进行。因此，选择适宜的天线系统有着重要的意义．本文针对卫星间光通讯的特点，选择了卡塞格伦型发射和接收天线，并提出了发射和接收共用一个天线的设想．这样不仅有利于简化光路结构，而且减轻了光路的整体重量，缩小了体积，使之更适宜安装在卫星上．同时，还对天线的主要参数进行了分析讨论，导出了天线的接收功率与天线半径、准直倍率的关系以及发射无线的增益与波长及准直倍率的关系。
The transmitting and receiving antennas, which are one of the most important components in the optical communication system between satellites, will directly affect the optical communications between satellites. Therefore, the choice of a suitable antenna system is of great importance. In this paper, the characteristics of the satellite optical communication, select the Cassegrain type transmitting and receiving antennas, and put forward the idea of transmitting and receiving a common antenna. This will not only help to simplify the optical structure, but also reduce the overall weight of the optical path, reducing the size, making it more suitable for installation on the satellite. At the same time, the main parameters of the antenna are also analyzed and discussed, and the relationship between the received power of the antenna and the antenna radius and the collimation ratio as well as the relationship between the gain of the transmitted radio and the wavelength and the collimation ratio are derived.