Patent ID: 7071891

Claim:
An antenna apparatus comprising: a casing and first, second, third and fourth dipole antennas for receiving radio waves in a same frequency band; wherein: said first through fourth dipole antennas are positioned in a same plane; said first and second dipole antennas are located on opposite sides of a first imaginary line passing through said casing, feed points of said first and second dipole antennas being located on opposite sides of an intersection of said first imaginary line and a second imaginary line orthogonal to said first imaginary line; said third and fourth dipole antennas are located on opposite sides of said second imaginary line, feed points of said third and fourth dipole antennas being located on opposite sides of said intersection of said first and said second imaginary lines; said first and second dipole antennas are disposed in line symmetry with said second imaginary line being an axis of symmetry, said third and fourth dipole antennas are disposed in line symmetry with said first imaginary line being an axis of symmetry, and said first through fourth dipole antennas are in line symmetry with third and fourth imaginary lines being axes of symmetry, said third and fourth imaginary lines passing through said intersection of said first and second imaginary lines at 45 degrees with respect to said first and second imaginary lines; and a directivity adjusting means is disposed in said casing, said directivity adjusting means adjusting the phases and levels of reception signals from said first through fourth dipole antennas thereby to provide a combined directivity of said first through fourth dipole antennas oriented to a desired direction.