Three-reflector compact range antenna measurement system and structure and parameter determination method

Abstract

The embodiment of the invention provides a three-reflector compact range antenna measurement system and a structure and parameter determination method thereof. In the system, a feed source is arranged on a direction moving device, the size and curvature of a main reflector are fixed, two shaping auxiliary reflectors are shaping reflectors with adjustable concavity and convexity, and the parameters of the shaping auxiliary reflectors and the geometrical relationship between the reflectors are different. Based on an equivalent paraboloid theory and a beam mode expansion theory, electromagnetic waves emitted by a feed source are reflected by a first shaping auxiliary reflector, a second shaping auxiliary reflector and a main reflector to form an emergent field. According to the three-reflector compact range antenna measurement system provided by the embodiment of the invention, the radiation direction of the electromagnetic wave emitted by the feed source is flexible and adjustable by adjusting the direction moving device, and the parameters of the two shaping auxiliary reflectors and the geometric position relationship between the reflectors are accurate. The method can be calculated and determined based on an equivalent paraboloid theory and a beam mode expansion theory so that the three-reflector compact range antenna measurement system has a high geometric design freedom degree.

Description

technical field [0001] The invention relates to the technical field of antenna measurement, in particular to a three-mirror compact field antenna measurement system and a structure and parameter determination method of the three-mirror compact field antenna measurement system. Background technique [0002] Millimeter-wave terahertz technology has a wide range of applications in astronomy, remote sensing, imaging, security inspection and other fields. In order to ensure that millimeter-wave terahertz technology can work normally, it needs to be accurately measured. In millimeter-wave terahertz technology, large-diameter antennas are usually used, but it is difficult for conventional field method measurements to meet the far-field measurement distance conditions required for large-diameter antenna measurements. Therefore, when measuring millimeter-wave terahertz systems, generally A compact field antenna measurement system is used. [0003] The compact field antenna measureme...

AI Technical Summary

Problems solved by technology

In the current three-mirror compact field antenna measurement system, in order to obtain better quiet zone performance, the direction of the feed source is relatively fixed and cannot be flexibly changed according to actual needs. At the same time, the geometric relationship between the three mirrors is also relatively fixed , and the focal diameter of the main reflector is large, resulting in a large lateral dimension of the entire system, which increases the construction cost and assembly difficulty of the entire system, and the geometric design freedom of the entire system is low

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