Electromagnetic compatible shield device and measuring method for electromagnetic shield effect

Abstract

The invention uses a bilayer structure; in which, the outer layer is made of a kind of materials that has high conductance and high absorption of electromagnet wave; the inner layer is made of a high reflection and low absorption. The method comprises: setting the sweeping frequency and dotting frequency; starting the wave mode agitator; transmitting the dotting frequency in stepping, respectively sampling the signals of dotting frequency from antenna and detecting ware; counting and analyzing the signals to decide if it fits the character of uniform field; making the dotting frequency process and sweeping frequency synthesis; saving them; making count and analyzes for the sweep data from the antenna the detection ware; figuring out the electromagnet shield effect.

Description

technical field [0001] The invention relates to an electromagnetic compatibility testing device and a method for testing electromagnetic shielding effect by using the device. Background technique [0002] Electromagnetic compatibility testing is related to ensuring information security and reducing electromagnetic pollution, and the application of its testing devices, technologies and methods is becoming more and more important. Electromagnetic shielding effect test is an important part of electromagnetic compatibility test. The electromagnetic shielding effect test is inseparable from the electromagnetic shielding test system, which usually includes: an electromagnetic compatibility shielding device, a transmitting antenna, a receiving antenna and a detection part arranged in the electromagnetic compatibility shielding device, as well as a microwave signal generator for generating signals, A spot frequency signal sampler for sampling and a computer or embedded system for c...

AI Technical Summary

Problems solved by technology

However, the existing electromagnetic compatibility shielding devices usually only use ordinary metal materials to make a fully enclosed cavity, which has a general electromagnetic shielding function.

Because the structure of this device is very simple, it can only be applied to low-frequency electromagnetic shielding, and cannot effectively shield high-frequency or ultra-high-frequency electromagnetic

The electromagnetic shielding effect test is based on the electromagnetic compatibility shielding device with high conductivity and high Q performance, that is, it is based on the theoretically closed and uniform field strength test space. The frequency characteristics are very poor, and the calculation of the uniform field of the wave mode reverberation chamber and the electromagnetic compatibility test method based on statistics are very complicated, which seriously restricts the application range and test effect of the electromagnetic shielding effect test.

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