卡塞格伦结构简单，安装方便，但次镜的盲区使天线的发射效率降低。基于此，设计了一种基于卡塞格伦望远镜的收发一体光学天线，充分利用卡塞格伦天线有效区域(盲区以外的部分)作为发射。通过4 个自聚焦透镜胶合光纤结构的端面环形离轴发射代替激光器高斯沿轴发射，可有效规避次镜盲区的影响；用大芯径塑料光纤接收信号，不但耦合效率高，且便于发射-接收对准。实际测试结果表明：该天线系统易于对准，发射损耗低，满足一般无线光通信系统的要求，最终实现收发一体。

Cassegrain antenna can be easily installed and its structure is much simpler. However, the blind area caused by the secondary mirror costs the transmission lost. A novel transceiver antenna based on Cassegrain telescope, which makes full use of Cassegrain antenna effective area (area outside part) as transmitting, is proposed. To effectively avoid the influence of blind zone, the annular distribution and off-axis transmission of four GRIN-lens glued fiber structures transverses insteads Gaussian distribution and along-axis transmission of the lasers. The large aperture plastic fiber is used as the receiving method to improve the coupling efficiency and it makes transmitting align with receiving easily. The test results show that the transceiver antenna is easy to align at a low transmission loss costs. It satisfies the requirements of the general free space optical communication (FSO) system, and ultimately achieves transceiver integrated in one Cassegrain antenna.