A method for improving the quiet zone performance of a microwave anechoic chamber and a modular dielectric barrier

Abstract

The present invention relates to the field of propagation technology for microwave anechoic chamber isolation from the external environment, and in particular to a method for improving the performance of the quiet zone of the microwave anechoic chamber and a modular dielectric barrier. It is connected with a rectangular base, the acute angle of the right-angled triangle is 20-30°, the right-angled surface of the modular dielectric fence faces the electromagnetic radiation source, and the slope of the modular dielectric fence faces the center of the quiet zone; and the slope of the right-angled triangle is set There is a wave-absorbing material layer, and the wave-absorbing material layer is respectively arranged on the right-angled surface of the vertical surface of the right-angled triangle and the shielding body of the ground plane of the microwave anechoic chamber; the modularized dielectric barrier is fixed or movable. The invention uses multiple dielectric barriers to suppress ground reflection or wall reflection of the microwave anechoic chamber, which can reduce the size of the microwave anechoic chamber, directly reduce the construction cost of the microwave anechoic chamber, and further improve the quiet zone performance of the microwave anechoic chamber.

Description

technical field [0001] The invention relates to the field of propagation technology for microwave darkroom isolation from the external environment, in particular to a method for improving the quiet zone performance of the microwave darkroom and a modular dielectric barrier. Background technique [0002] Microwave anechoic chamber is widely used in many fields such as antenna, target RCS characteristic measurement, electromagnetic compatibility test and electronic equipment simulation test. Its most basic function is to provide a propagation environment for electromagnetic waves that is approximately free space and isolated from the outside. The size design of the microwave anechoic chamber generally follows the following principles: the length of the anechoic chamber must meet the test requirements of the equipment under test with antennas of a certain diameter. The restriction is the far-field distance formula, R≤K(D 1 +D 2 ) / 2λ. The transverse dimension of the darkroom...

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Problems solved by technology

[0003] Depend on figure 1 It can be seen that when the center of the quiet zone 4 or the position of the electromagnetic radiation source 3 is asymmetrical, the incident angle of electromagnetic waves increases. If the incident angle α is greater than 60°, the performance of the absorbing material will drop sharply, seriously affecting the reflection level index of the quiet zone, and then affecting The accuracy of antenna measurement or simulation test must take certain measures

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