| 摘要 |
PROBLEM TO BE SOLVED: To reduce the amount of ferrite being used and to improve the performance for absorbing electronic waves in MHz-GHz band by specifying the gap rate between the electric field of arrival electronic waves and a ferrite magnetic material in the direction of a magnetic field for an electronic wave absorption wall in a wall with reinforced concrete and exterior finish materials. SOLUTION: A ferrite plate 1 is arranged at an equal interval of (c) in the direction of a magnetic field and is arranged at equal intervals of (a) in the direction of an electric field. A gap rate is the total ratio of the interval of the ferrite plate 1 in a predetermined range, where the ferrite plate 1 of a wall is arranged and is calculated from (interval/interval + ferrite plate)×100 for an arrangement at equal intervals. A gap rate c/d in the direction of a magnetic field is set to 20-50% and a gap rate a/b in the direction of an electric field is set to 25-45%. Even if the size of the ferrite plate 1 is adjusted appropriately and the interval is increased, sufficient reflection loss can be obtained in a UHF (300 MHz-3 GHz) band, thus reducing the amount of usage of the ferrite plate and reducing the weight of an electronic wave absorption wall.
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