Research On The Electromagnetic Coupling Law Of Small Shielding Enclosure Under Reverberation Chamber Condition

Shielding Effectiveness(SE) theory of small size shielding enclosures is one of the important part of EMC field.Most of the Electronic devices belong to small size shielding enclosures,but there isn't international testing standard.Because of the defects of traditional SE definition,the practical shielding effective can't reflect under complex electromagnetic environment.Reverberation Chamber Room testing method using average power(or E field),which provide a new standard method for describing the SE under actual isotropic electromagnetic field. Therefore,the Shielding Effectiveness theory and the method of testing measures of small Shielding enclosures under Reverberation Chamber Room environment has become a research focus.In the paper,using the large Reverberation Chamber Room of the national defense Key laboratory of Ordnance engineering college,carry out a series of experiment about the coupling law of small size Shielding enclosure between isotropic electromagnetic field.In experiments,the effect of Frequency,area and shape of the shield enclosure' open cell on the field distributing and shielding effectiveness will be discussed.Meanwhile,the comparison of the repeatability of using multi-point average measure and single point multiple average measure,the effect of the distance between the probe and metal wall and direction of the shielding enclosure's open cell on the experimental results of standard field in Reverberation Chamber Room are also will be given.On this basis,the discussion for finding a shielding effectiveness testing measures which have good reproducibility and reliability will be carrying out.Besides of the experimental research,the corresponding imitate research also will be carry out.In this part,adopted large electromagnetic simulation software-FEKO which based on Moment method and reference the correlated experience of foreign countries,using multiple string electromagnetic waves to simulate the complex electromagnetic environment in the Reverberation Chamber room.And based on this,the effect of the shape of shielding enclosure,area, frequency and polarized fashion on the magnitude of field and shielding effectiveness also will be discussed.In the end,according to the experiment and simulation research,some guiding suggestions for small size shielding enclosure under reverberation Chamber environment room will be given.