Small circularly-polarized horn antenna

Abstract

The invention discloses a small circularly-polarized horn antenna and mainly solves the problem that the prior art cannot simultaneously meet requirements of high power, high gain, wide band and circular polarization. The small circularly-polarized horn antenna comprises a coaxial-circular waveguide converter (1), a circular polarizer (2), a conical horn (3), a dielectric lens (4) and a circular waveguide (7), the circular polarizer (2) is mounted inside the circular waveguide (7) which is directly connected with the conical horn (3), the dielectric lens (4) is fixed in front of the conical horn (3), the conical-circular waveguide converter is mounted on the side wall of the circular waveguide (7), the circular polarizer (2) is composed of a symmetric hexagonal dielectric inserting piece (5) and two rectangular compensation grooves (6) which are fixed inside the circular waveguide (7), and the two compensation grooves are symmetrically arranged right above and right below of the dielectric inserting piece (5) inside the circular waveguide (7). The small circularly-polarized horn antenna has the advantages of wide band, good stability, high gain, large power capacity and good circular polarization characteristic.

Description

technical field [0001] The invention belongs to the field of microwave antennas, and relates to a circularly polarized horn antenna, which can be used as a feed source for various complex antennas or directly as an antenna, and can be widely used in wireless communication, radar and other fields. technical background [0002] With the rapid development of wireless communication technology, long-distance and large-range space communication systems such as mobile satellite communication systems have attracted more and more attention and applications. Among them, satellite communication is also an important part of the future global information superhighway. It is famous for its wide coverage and large communication capacity. It has the advantages of long communication distance, no limitation of geographical environment, excellent quality and high economic benefit. This puts forward higher requirements on the design of the antenna. Taking satellite communication as an exampl...

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Problems solved by technology

[0003] Although there are various forms of antenna implementation, it is not easy to meet the above-mentioned requirements at the same time

This is mainly reflected in the following aspects: (1) Although the common microstrip antenna is easy to achieve circular polarization characteristics, its power capacity is small and its bandwidth is narrow. In order to achieve high gain, it usually needs to form an array or install lens, which also makes it difficult to meet the requirements of miniaturization

(2) Common horn antennas are usually linearly polarized antennas. Although they have the characteristics of large power capacity, high gain, and wide frequency bandwidth, they do not meet the requirements of circular polarization.

(3) Other common circularly polarized antennas usually have complex structures and complex feeding forms, which are not conducive to mass production and difficult to ensure consistency.

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