CPC H01Q 9/0407 (2013.01) [H01Q 19/023 (2013.01)] | 17 Claims |
1. An antenna device comprising:
a substrate that includes a plurality of insulating layers laminated one on top of another;
a ground electrode provided in or on the substrate;
a radiation electrode provided on the substrate; and
a waveguide structure that has:
a slit that is positioned in an electric field direction of the radiation electrode in plan view and that is provided in the ground electrode, and
a conductor wall that surrounds the slit and that extends in a thickness direction of the substrate, wherein:
a dimension of the waveguide structure in a magnetic field direction of the radiation electrode in the plan view is greater than ½ of a wavelength of a radio wave emitted by the radiation electrode in a medium of the substrate,
the radiation electrode and the slit are provided in different positions in the plan view,
a length from the slit to a terminal portion of the waveguide structure in the electric field direction of the radiation electrode in the plan view is about ¼ of a wavelength of the radio wave emitted by the radiation electrode in the waveguide structure,
the radiation electrode is disposed on a first surface of the substrate, and
the waveguide structure is provided so as to be exposed in the first surface of the substrate.
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