Low-axial-ratio circularly polarized antenna with isolation structure

The invention discloses a low-axial-ratio and high-power-capacity circularly polarized antenna with an isolation structure, and belongs to the technical field of high-power microwave measurement. The isolation structure is added between the antenna circular polarization generation structure and the feed structure to suppress the influence of different connection structures at the rear end of the antenna. A typical isolation structure is a metal surface expanding backwards, on one hand, through proper dip angle design, forward reflection of the isolation structure is well restrained, the influence on a front-end circular polarization generation structure is reduced, and the low axial ratio characteristic is guaranteed; on the other hand, proper depth and size design is adopted, surface current backward transmission and rear end metal face reflection are effectively restrained, the influence of a rear end connecting structure on the low axial ratio characteristic of the antenna is reduced, and finally the circu