| 摘要 |
PROBLEM TO BE SOLVED: To practice radiocommunication with the same frequency in plural electromagnetic shielding spaces, and reduce the number of antennas by forming a building inside space as plural electromagnetic shielding spaces by covering a periphery with an electromagnetic shielding layer, connecting these spaces to each other by a metallic waveguide, and arranging a radiocommunication antenna in the waveguide. SOLUTION: The inside of a building is partitioned by an electromagnetic shielding layer composed of an electromagnetic shielding material with respective floors 1, not as a single electromagnetic shielding space, or mutual rooms 2 and 2 and a wall between a room 2 and a core 3 are partitioned on the respective floors 1 by the electromagnetic shielding material, and plural electromagnetic shielding spaces independent with respective floors or with respective rooms are constituted. In order to form plural electromagnetic shielding spaces 2, 2... in the same zone, the rooms 2 are connected to each other by a waveguide 5 composed of a metallic duct, and an antenna 6 such as a PHS for a business place is arranged in the waveguide 5 so as to penetrate through the inside and outside of the duct. Here, opening widths (a and b) of the waveguide 5 are designed so as to become larger thanλ/2 when a wave length of a radio frequency is denoted byλ.
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