ANTENNA ASSEMBLY

摘要

A dielectric substrate (101) is a square substrate having a dielectric constant of ϵr, a thickness of t and a length Wd of one side. A ground conductor (102) is provided on one side of the dielectric substrate (101) in a shape similar to that of the dielectric substrate (101). An MSA element (103) is formed of a square copper foil having a length Wp of one side in the center on the other side of the dielectric substrate (101). Monopole antennas (104a-104d) are copper wires having a diameter of D and a length of L and arranged, at a constant interval, on the diagonals of the MSA element (103) perpendicularly to the dielectric substrate (101). Power is fed selectively to whichever having a higher receiving power, the MSA element (103) or the monopole antennas (104a-104d). When the monopole antennas (104a-104d) are selected, phase and amplitude of each element are controlled. Consequently, a high gain is ensured in all directions over a hemispherical surface ranging from the horizontal direction to the vertical direction, resulting in an antenna assembly small in size and simple in arrangement.