| 摘要 |
PROBLEM TO BE SOLVED: To provide a spiral antenna which allows the reduction in the height of an antenna to be achieved while ensuring wide band properties. SOLUTION: A spiral antenna includes: antenna elements 11 patterned in a spiral shape on a dielectric substrate; a cavity 13 formed by providing an air gap between the antenna elements 11; and a magnetic substance 15 located between the antenna elements 11 and the cavity 13. Further, the antenna is formed step-wise or tilted so that the sum of the distance between the antenna elements 11 and the magnetic substance 15, and the thickness of the magnetic substance increases from a spiral center toward the outer circumference. COPYRIGHT: (C)2011,JPO&INPIT
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