A Design Method for Improving the Signal-to-Noise Ratio of Symmetrical Dual-mirror Antenna

Abstract

The invention relates to a design method for improving the signal-to-noise ratio of a symmetrical double-mirror antenna, which is characterized in that: the symmetrical double-mirror antenna designed by the method is compared with the general design, and the main mirror and the auxiliary mirror have an optical path corresponding relationship. In addition, the primary mirror extends to a certain size along the busbar to form an annular area that has no optical path correspondence with the auxiliary mirror. The width of the annular area is 0.01-3 times the longest working wavelength of the antenna, and the diameter of the auxiliary mirror is selected as the minimum working The frequency corresponds to 6‑12 times the wavelength, which is related to the lowest operating frequency of the dual-mirror antenna. In order to achieve the purpose of improving the interception efficiency of the primary mirror, increasing the antenna gain, and reducing the antenna noise temperature, it is suitable for various standard and shaped dual-mirror antennas such as Cassegrain antennas, Gregorian antennas, and ring-focus antennas.

Description

technical field [0001] The invention discloses a design method for improving the signal-to-noise ratio of a symmetrical double-mirror antenna, which can achieve the purposes of reducing the occlusion effect of the secondary mirror, improving the interception efficiency of the primary mirror, reducing the noise temperature of the antenna, and improving the signal-to-noise ratio of the antenna. Various standard and shaped symmetrical dual-mirror antennas such as Ron antenna, Gregorian antenna and ring focus antenna. Background technique [0002] Dual-mirror antenna is a typical form of high-gain antenna, which has a wide range of applications in satellite communication, radio astronomy, radar, radio monitoring and many other fields. [0003] At present, the design of the dual-mirror antenna is mainly based on ray tracing. The main mirror and the secondary mirror are generally designed so that the optical paths are completely corresponding, that is, the rays emitted by the feed...

AI Technical Summary

Problems solved by technology

However, because this method does not consider the specific working frequency band of the antenna, the diameter of the secondary mirror is generally selected to be 1 / 10 of the diameter of the primary mirror. Therefore, when the minimum working flat rate of the dual-mirror antenna is high, unnecessary occlusion is introduced, causing antenna gain Decline and Sidelobe Elevation

However, when the minimum operating frequency of the dual-mirror antenna is low, and the size of the secondary mirror is only a dozen or even less than ten minimum operating wavelengths, the performance of the antenna decreases significantly.

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