Source stirring method of electrical modulation electromagnetic wave orbit angular momentum mode for reducing reverberation room measurement uncertainty

Abstract

The invention discloses a source stirring method of an electrical modulation electromagnetic wave orbit angular momentum mode for reducing reverberation room measurement uncertainty. An electrically modulated vortex electromagnetic metasurface is deployed in a reverberation room, thus, a brand new degree of freedom is introduced; for the electromagnetic wave orbit angular momentum, various independent electromagnetic wave orbit angular momentum modes can be controlled and switched through an electrical modulation mode, independent sample number is increased effectively, the source stirring method can be used simultaneously with other stirring methods under a limited space condition, measurement uncertainty is reduced further, when the source stirring method is used simultaneously with theother stirring methods, and under a condition where total sample number is fixed, overall test time can be controlled through control of the number of work modes of the electromagnetic metasurface. The method provided by the invention can effectively reduce measurement uncertainty of the reverberation room, and has the characteristics of occupying small space, using simple modulation modes, needing short test time, being convenient to make, and being low-cost.

Description

technical field [0001] The invention belongs to the technical field of microwave reverberation chambers, and relates to a source stirring method for an electrically-regulated electromagnetic wave orbital angular momentum mode that reduces the measurement uncertainty of a reverberation chamber. Background technique [0002] The microwave reverberation chamber is a large metal cavity, which generates a spatially uniform, isotropic, and randomly polarized electromagnetic field in the working area of ​​the cavity through different stirring methods. As an emerging electromagnetic testing environment, the reverberation chamber has the characteristics of low construction cost, high testing efficiency, and good reproducibility. It has been widely used in electromagnetic compatibility testing and air interface testing. [0003] The uniform characteristics of the electromagnetic field in the reverberation chamber are presented in a statistical sense. The more effective the stirring me...

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Problems solved by technology

[0005] The mechanical rotation of the stirrer and turntable takes time, and the stirring method involving mechanical rotation is very time-consuming due to the large amount of measurement data in the reverberation chamber

Frequency stirring can only post-process the data, but cannot obtain more effective raw data, so the scope of application is very limited

Antenna stirring requires that the antennas deployed in the chamber be as uncorrelated as possible, that is, the antennas need to be far enough apart. On the one hand, the deployed antennas will reduce the effective working area of ​​the reverberation chamber; on the other hand, the size of the reverberation chamber limits the possible Upper limit on the number of independent antennas deployed

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