Microwave anechoic chamber for intermodulation test

Abstract

The invention discloses a microwave anechoic chamber for intermodulation test, which is composed of a chamber main body and a wave absorbing material arranged in the chamber main body. The chamber main body is a closed space composed of a keel frame and blocky wall faces fixed on the keel frame and capable of accommodating workers to walk inside. The chamber is characterized in that a shield layer is arranged on the surface of the side of the blocky wall faces facing the closed space, the wave absorbing material is fixed on the shield layer, and an operation platform for workers to walk on is arranged inside the chamber main body. The inventive chamber adopts an aluminum alloy plate adhered to a fireproof flame-retardant plate, and uses an insulating shielding aluminum foil to cover a joint to effectively avoid formation of large-area strong intermodulation source in the chamber and ensure that the interference source prone to excitation and intermodulation in the shield body structure is weakened, to the maximum extent.

Description

technical field [0001] The invention relates to a testing laboratory used in the communication industry, in particular to a microwave anechoic chamber for intermodulation testing. Background technique [0002] As the communication frequency band becomes more and more crowded, the quality requirements of communication signals are getting higher and higher, and the intermodulation signals generated by communication antennas during work have more and more adverse effects on communication systems, and their performance indicators become increasingly important. Intermodulation characteristics are measured. [0003] The antenna is a microwave device that radiates electromagnetic waves to free space. The test of antenna performance must be carried out in a free space environment. Due to the limitation of the site and working conditions, people hope to test the antenna device indoors, so a microwave anechoic chamber must be used to simulate the free space. Space environment, to ach...

AI Technical Summary

Problems solved by technology

The main reasons affecting the intermodulation index test are as follows: anechoic chamber shields are mostly made of ferromagnetic materials such as steel; fasteners, gaps or burrs produced by anechoic chamber shield splicing or process; the absorber is not tightly installed, resulting in part of the shield exposed ; The layout of equipment such as lighting fixtures in the dark room is not ideal; the sundries in the dark room are not cleaned up in time, etc.

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