摘要 |
PROBLEM TO BE SOLVED: To determine an appropriate direction of an antenna easily and surely when the antenna is installed so that it may be directed to a source radiating a radio wave for communication or broadcasting. SOLUTION: When an antenna 1 is installed to be directed to a radio wave radiating source, a dielectric member 2 is located in front of the antenna 1, covering half the opening surface thereof, and the dielectric member 2 is made to have such a thickness that a radio wave transmitting from the source has a phase delay of half wavelength or odd-fold of the half wavelength to a radio wave passing not the dielectric member 2 but the air having the same thickness. The reception level by the antenna is observed while moving the antenna 1 and dielectric member 2 integrally and changing the direction of the antenna, thus adjusting and determining the appropriate direction of the antenna 1 so that the reception level thereof becomes zero.
|