| 摘要 |
First, second, third and fourth dipole antennas ( 14, 16, 18, 20 ) are disposed in a casing ( 1 ). The first through fourth dipole antennas are arranged in the same plane, and are disposed in line symmetry with respect to first through fourth imaginary lines (A, B, C, D) passing through the center of the casing ( 1 ) at an angle of 45 degrees between adjacent imaginary lines.
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