PROBLEM TO BE SOLVED: To receive a radio wave (radiation beam) at the best position (place) for a receiving antenna.;SOLUTION: A thermochromic material (40) is coated onto a radio absorptive material (30). Subsequently, the radio absorptive material (30) to which the thermochromic material (40) is coated is arranged at a position for wishing to check an electric field intensity at the time of receiving the radio wave by a receiving antenna (26). Next, the radio wave is radiated from a transmission antenna (16). At the time, the radio absorptive material (30) generates heat when absorbing the radio wave in accordance with the electric field intensity. The color of thermochromic material (40) is changed in accordance with a temperature when the radio absorptive material (30) generates heat. Thus, a discolored part (42) of the thermochromic material (40) is visualized as an irradiation range, in which the receiving antenna (26) receives the radio wave.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2017,JPO&INPIT
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