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`An antenna apparatus includes: a dielectric substrate; at least first and second
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`radiators disposed in a first wiring layer in the dielectric substrate; a first reflector
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`disposed in a first range in a second wiring layer in the dielectric substrate, the first
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`range including a second range where the first radiator is projected in the layer
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`thickness direction of the dielectric substrate; a second reflector disposed in a third
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`range in the second wiring layer, the third range including a fourth range where the
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`second radiator is projected in the layer thickness direction; and an electromagnetic
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`band-gap disposed between the first and second radiators. The electromagnetic
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`band-gap has patches disposed in the first wiring layer, a ground electrode disposed
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`in a third wiring layer at a different place from the second wiring layer in the layer
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`thickness direction, and a first via extending in the layer thickness direction, both ends
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`of the via mutually connecting the patches and ground electrode.
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`23
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`P1005675
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