| 摘要 |
PROBLEM TO BE SOLVED: To provide an equipment for shielding electromagnetic radiation, especially, for preventing electric and/or magnetic field existing in a dead air space from leaking outside, due to the leakage of radiation through an opening of the dead air space which can be opened and closed. SOLUTION: Openings are so formed that they can be closed to advantage by a plurality of removable electromagnetic radiation impeameable plates. At that time, high-frequency sealing units having high-frequency sealing members 16, 16' which are formed from elastic-deformable electric conductors to advantage are locate in the peripheral regions of the plates and/or edges of the openings of the dead air space which need to be closed, to advantage. Due to these high-frequency sealing units, the plates are mounted on the wall of the dead air space, being electrically connected to the wall through the high-frequency sealing members 16, 16'. The distance 'a' between the two adjacent sealing members 16 and 16' should be set to one fourth the minimum wavelengthλof the radiation to be shielded.
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