To prevent intrusion of radio noise together with radio interference in the buildings such as a factory and a ware house by simple execution effectively using common construction materials.
A surrounding shielding layer is constituted by means of a roof using a metallic roofing material 1, an outer wall using a metallic external material 2 and glass 3 with an electromagnetic shielding function and floors 4, 5 using a conductive material. Further, the metallic roofing material 1 is composed of a multifunctional folded plate type roofing material inwardly pasted with a wave-absorbing material and the floors 4, 5 using above conductive material are composed of a metallic structure material concurrently a mold 4 and concrete so as to prevent a radio noise from outside together with preventing mutual interference of insidely used radio so as to create a radio environment of an inner radio communication system.
SAKURAI HITOSHI
SHIRAI YUKIO
TAKESHITA TADATAKA
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