Air-to-air missile radar seeker parabolic antenna broadband small feed

Abstract

The invention discloses a parabolic antenna wide-band small feed source, which belongs to the radar technology and relates to the improvement of the antenna feed source of the air-to-air missile radar seeker. It includes an E-plane four-horn feed, which is characterized in that polyimide dielectric is filled in the rectangular waveguide cavity of each horn antenna of the E-plane four-horn feed, and the polyimide medium passes through the radiation cavity of the horn antenna After protruding out of the bell mouth, the shape of the part of the polyimide medium outside the waveguide cavity is a 4-prism truss. The invention realizes the good matching characteristics of the horn antenna on the broadband, not only reduces the volume of the feed source but also increases the frequency bandwidth, provides a small-sized, wide-band feed source for the passive parabolic antenna, and satisfies the requirements of the new missile development needs.

Description

Air-to-air missile radar seeker parabolic antenna broadband small feed technical field The invention belongs to the radar technology and relates to the improvement of the antenna feed source of the air-to-air missile radar seeker. Background technique In the development of new long-range air-to-air missiles, in order to improve the detection range and anti-jamming performance of the radar seeker, the radar seeker with active and passive composite guidance is usually used. The active-passive composite antenna is a key sub-component in the seeker, and the flat waveguide slot array monopulse antenna with high gain and low sidelobe characteristics can be used as the active radar tracking antenna; while the passive radar tracking antenna adopts a wide-band Characteristics of a monopulse parabolic antenna. The active-passive composite antenna shares one aperture plane. In order to minimize the mutual influence, a metal polarization grid is used to achieve polarization isolation...

AI Technical Summary

Problems solved by technology

At present, one of the methods to reduce the volume of the antenna is to load the antenna with a medium. The general application range is a medium-loaded conical horn or a medium-loaded rectangular waveguide. However, after the antenna is loaded with a medium, due to the different transmission characteristics of electromagnetic waves in the two materials, This type of dielectric-filled antenna has a large reflection, and it is more difficult to require a smaller standing wave in a relatively wide frequency band

In order to reduce reflection and obtain better matching, the traditional method is to add tuning screws with inductive or capacitive properties in the horn or make the medium into a cone in the horn antenna to achieve the purpose of matching, but this method can only It can get better matching in the narrow frequency band but is limited in the broadband, so it can't be used for air-to-air missile radar seeker parabolic antenna broadband small feed

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