Compact broadband circularly polarized antenna

A compact broadband circularly polarized antenna, comprising an antenna body, wherein a cavity is formed in the antenna body, a plurality of ridges and a plurality of baffles are formed inside the cavity, the ridges are configured for antenna miniaturization and bandwidth widening, and the baffles are configured to form a phase difference;

• wherein the cavity comprises a baffle mounting rectangular section located on a rightmost side, wherein a front rectangular mounting section is formed on a left side of the baffle mounting rectangular section, an intermediate transition section is formed on a left side of the front rectangular mounting section, and a rear rectangular section with a standard rectangular waveguide port is formed on a left side of the intermediate transition section;
• wherein a middle of each of the upper inner wall and the lower inner wall of the front rectangular mounting section and a middle of each of the upper inner wall and the lower inner wall of the baffle mounting rectangular section are respectively formed with the ridges, a projection height of the ridges on the upper inner wall and the lower inner wall are less than a half of a width of inner walls located between the upper inner wall and the lower inner wall, the baffles are located in the baffle mounting rectangular section and is located between the upper inner wall and the lower inner wall, and each of the baffles extends from one of the inner walls to the other one of the inner walls between the upper inner wall and the lower inner wall, and a height of the baffles in an extension direction is greater than a half of a width of the upper inner wall and the lower inner wall.