都市空間におけるUHF帯の電波の遮蔽障害

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タイトル別名
  • EFFECT OF THE SHIELDING OBSTACLE ON THE ELECTROMAGNETIC WAVE OF THE UHF BAND IN THE URBAN SPACE
  • トシ クウカン ニ オケル UHFタイ ノ デンパ ノ シャヘイ ショウガイ

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The digital terrestrial television which uses the electromagnetic wave of the UHF band was shifted completely in July, 2011. In this paper, the electric field strength level is measured in the reception condition that is different of the distance and the building environment in the urban space. As a result of the measurement, the following have been understood. 1. The building of the 11th floor to the 14th floor shows the amount of radio attenuation more than 10dB. 2. In an open space, whenever the distance from a digital tower is 3 km away, the electric field strength level decreases about 10dB. When the distance from a digital tower exceeds 18 km, the value of the electric field strength level does not change according to circumference environment. 3. The actual electric field strength level of urban space is decreased to 70 percent or less as compared with the electric field strength level in free space. At the ground and the point which is subject to the influence of a building, it decreases even to about 20 percent.

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