L-waveband broadband dual-polarization short-backfire dipole antenna

Abstract

The invention discloses an L-waveband broadband dual-polarization short-backfire dipole antenna which is composed of four radiators, two coaxial feed lines, two metal Balun support columns, two horizontal problems an improved hexagonal reflection back cavity, a fixed disck and a hexagonal matching disk. The invention uses the improved hexagonal reflection back cavity to reduce mutual coupling among units, improve the bandwidth and enhance the axial gain. The antenna is characterized in that radiation directional diagram are symmetrical rotationally, the cross polarization level is low, the reflection loss is low and the like; and can serve as a composition unit in the front end of a receiver of an antenna phased array feed source of an L-waveband radio astronomy telescope, as well as a phased array feed source for a communication, measurement and control and reflection plane monitoring antenna.

Description

technical field [0001] The invention relates to a broadband dual-polarized short back-radiating dipole antenna, in particular to an L-band broadband dual-polarization short back-radiating dipole antenna. Background technique [0002] The radio telescope is the most important research tool in radio astronomy. It receives and records electromagnetic signals from distant interstellar through high-gain antennas, high-sensitivity receivers and corresponding back-end equipment. [0003] In terms of composition, radio telescope antennas can be divided into two types: single antenna and antenna array. In order to meet the requirements for the receiving area, the former often use large-diameter reflector antennas, including parabolic antennas, spherical antennas, Cassegrain antennas, Gregorian antennas, parabolic cylindrical antennas, etc., while the latter use line antennas, reflector Planar antennas or even array antennas are used as units to form a continuous or discontinuous lar...

AI Technical Summary

Problems solved by technology

[0005] Commonly used broadband feed array units include broadband oscillators, Vivaldi and other forms. Although the broadband oscillator can achieve a wider bandwidth, the pattern is wider, the symmetry is poor, and the mutual coupling between the units is stronger; the bandwidth of the Vivaldi unit is wider. Wide, strong mutual coupling, and not easy to connect with the LNA of the back-end cooling

Cavity-backed antennas have good performance, but the commonly used rectangular and circular back-cavities are large in size, so they are generally only used alone, and it is difficult to be used as a unit of an array antenna

When a rectangular cavity-backed antenna forms a triangular array, the back cavities of adjacent rows of elements obstruct each other, making it difficult to meet the element spacing required by the phased array feed.

At the same time, when rectangular and circular cavity-backed antennas form an array, there are gaps between the units, the receiving area is discontinuous, and the efficiency is low

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