The advantages of radiometer in the application of Earth remote sensing are outstanding. With the development in recent decades, the application field is vast, which puts higher requirements on the performance of radiometer system. Meanwhile, the antenna is much more difficult to implement. This paper describes the antenna technology from performance requirements. For mechanical scanning radiometer, 7-m mesh reflector antenna is the bottleneck, and it is difficult to break through the key technology in the short term. To avoid this difficulty, synthetic aperture radiometers and pushing radiometers have been developed.