A dual-polarized broadband weakly coupled feed array

Abstract

The invention discloses a dual-polarization broadband weak coupling feed source array and relates to a phase array feed source receiver in the radio astronomy field. The dual-polarization broadband weak coupling feed source array can be used in feed sources of reflector antennasin the field of communication, observing and control and monitoring. According to the distribution rules of a reflector antenna focal plane field, a hexagonal reflection back cavity vibrator is distributed in a hexagonal small-space distribution mode to form a feed source array, so that energy receiving is facilitated, sampling of a focal plane field distribution is met, and good broadband characteristics and weak array coupling can be achieved. The hexagonal reflection back cavity vibrator comprises a radiator, a coaxial feeder, a hexagonal reflection back cavity and a matching disc, wherein the reflection back cavity adopts a small hexagonal structure, and array forming is facilitated.

Description

technical field [0001] The invention relates to a dual-polarization wide-band weakly coupled feed source array used for radio telescope antennas in the field of radio astronomy, and is especially suitable for L-Ku frequency band radio telescope phased array feed source receivers as a dual-polarization, wide-band , The array feed front end with mutual coupling between weak array elements can also be applied to the feed of reflector antennas in the fields of communication, measurement and control, and radio monitoring. Background technique [0002] With the development of radio astronomy technology, astronomers' demand for observation of cosmic radio sources continues to increase. In the case that the number of radio telescopes cannot be significantly increased, the use of multi-beam antenna technology can effectively increase the observation speed. For example, the Australian Parkes64m and Puerto Rico’s Arecibo305m radio telescopes are equipped with 13 beams and 7 beams respe...

AI Technical Summary

Problems solved by technology

Since the phased array feed requires a very small distance between the array elements, the influence of mutual coupling is very obvious, which leads to the impedance mismatch between the array elements and the low noise amplifier, and the noise caused by impedance mismatch is one of the main sources of system noise one

In addition, Vivaldi-style array elements are not easily interfaced with cooled LNAs, further limiting the possibility of reducing system noise temperature

[0005] Cavity-backed antennas have good performance within the bandwidth of 2:1, and the cavity is also conducive to reducing the mutual coupling between adjacent units. However, the commonly used rectangular and circular back-cavities are large in size, so they can only be used alone. Unit that is difficult to use as an array antenna

When a rectangular cavity-backed antenna forms a hexagonal array, the back cavities of adjacent rows of array elements interfere with each other, which makes it difficult to meet the element spacing required by the phased array feed.

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

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