| 摘要 |
<p>Disclosed is an antenna device, comprising a radiator that radiates linearly polarized radio waves, and a reflector further comprising a plate-shaped member. A plurality of approximately square aperture parts are positioned linearly upon the plate-shaped member, in the same direction as the direction of polarization of the radio waves; and a group of aperture parts, comprising a plurality of aperture parts, is positioned in a plurality of levels in the orthogonal direction to the direction of polarization of the radio waves. The length of the plate-shaped member in the same direction as the direction of polarization is set to a length capable of reflecting radio waves of the largest frequency in the usable frequency band of the radiator, corresponding to the wavelength of the radio waves of the largest frequency thereof. The length of a given side of each aperture part is such that the length when the length of one side of one aperture part, multiplied by the number of aperture parts that linearly configure the aperture group, is added to the length of the plate-shaped member in the same direction as the direction of polarization, is the length capable of reflecting radio waves of the smallest frequency in the usable frequency band of the radiator.</p> |
