Antenna device, antenna module, communication device, and radar device
AssigneeMurata Manufacturing Co., Ltd.
InventorHiroshi NISHIDA
Life of this patent
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Abstract
An antenna device includes a substrate, a first ground layer, a radiation electrode, and waveguide structures. Each of the waveguide structures has a slit and a conductor wall. The slit is positioned in an electric field direction of the radiation electrode and provided in the first ground layer. The conductor wall surrounds the slit and extends in a thickness direction of the substrate. A dimension of the waveguide structure in a magnetic field direction in plan view is greater than ½ of a wavelength of a radio wave emitted by the radiation electrode in a medium of the substrate. A length from the slit to a terminal portion of the waveguide structure is about ¼ of a wavelength of the radio wave emitted by the radiation electrode in the waveguide structure.
Claims20
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, and
- 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.
Dependencies are inferred from the claim text.