Research On Reducing The Error Of Radiation Emission Test In The Shielded Room Environment

As the more and more comprehensive application of electron and electric devices, the problems of electromagnetic compatibility in electric devices stand out increasing. So in order to solve these problems, people pay attention to the study of electromagnetic compatibility test. Because electromagnetic compatibility test is the most effective way to find and settle the problems of electromagnetic compatibility.Firstly, this thesis analyzes the difference and sameness between the standard radiation emission and the pre-radiation emission in contrast, while error resource of the standard radiation emission is analyzed, and then the calibration course of test accessories is gave out according to the standard calibration method and a conclusion is obtained that test environment is one of the key factors that affect the result of the radiation emission. Secondly, aiming at resonance arising in the shielded room, a measure restraining the resonance of shielded room is put forward that absorbing material is laid around the receive antenna. The measure is affirmed by basing on Finity Domain Time Difference Method and simulating using electromagnetic simulation software XFDTD. Finally, a method of calibration of shielded room environment based on the theory of regression analysis and aiming at the same kind of devices is brought forward, and then the feasibility of the method in theory is affirmed.