| 摘要 |
A slot array antenna comprises a slot array antenna main body ( 111 ) and a dielectric cover ( 116 ). The slot array antenna main body ( 111 ) has a slot plate ( 113 ). A main beam ( 115 ) having radiation directivity, extending in a direction inclined a tilt angle theta alone from a direction normal to a plane P 1 of the slot plate ( 113 ) is set to the slot array antenna main body ( 111 ). The dielectric cover ( 116 ) has an inclination angle alpha formed by an outer plane P 3 and an inner plane P 4 and is comprised of a dielectric material having a refractive index n. The inner plane P 4 of the dielectric cover ( 116 ) is provided so as to oppose to the slot plate ( 113 ) of the slot array antenna main body ( 111 ). Thus, the main beam ( 115 ) having the radiation directivity is transmitted through and refracted by the dielectric cover ( 116 ), so that the tilt angle theta is corrected to allow the main beam to extend in a direction orthogonal to the outer plane P 3 of the dielectric cover ( 116 ).
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