| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device capable of variably setting the width of a radial beam in a wide range in accordance with its specification with a microstrip antenna as a radiating element. SOLUTION: This antenna device is constructed by providing the radiating element 1 consisting of the microstrip antenna disposed in parallel to a ground conductor plate 2 on the ground conductor plate 2 through the first dielectric layer 3 and providing a parasitic element 5 consisting of a conductor plate on the radiating element through the second dielectric layer 4. Reflectors 7 are provided on the rear surface side of the antenna device at a prescribed angle with respect to the surface of the radiating element, and the reflectors 7 are made to conduct to the ground conductor plate or an auxiliary conductor plate 9 provided through the third dielectric layer.
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