TERRESTRIAL WAVE RECEIVING ANTENNA DEVICE AND ANTENNA GAIN ADJUSTING METHOD

摘要

A terrestrial wave receiving antenna device causing no degradation of the directivity gain while receiving a vertically polarized wave even if the antenna is installed at a slant with respect to the vertical direction. The antenna device has a planar antenna installed at a slant with respect to the vertical direction and a reflective plate spaced by a predetermined distance from the planar plate and installed horizontally or inclined at a predetermined angle with respect to the horizontal direction. The reflective plate is disposed as near to the planar antenna as possible or spaced from the planar antenna by a distance equal to the integral multiple of o.5lambda where lambda is the wavelength of the terrestrial wave that the planar antenna receives.