Antenna device and electronic device

An antenna device comprising:

• a power supply coil including a coil-shaped conductor, the power supply coil being coupled to a power supply circuit that operates in a first frequency band;
• a first conductive member including a first main surface;
• a second conductive member including a second main surface including at least a portion thereof that opposes the first main surface;
• a third conductive member that has an area that is smaller than an area of the first conductive member when viewed in a direction perpendicular or substantially perpendicular to the first main surface;
• and
• a plurality of connections that couple the second conductive member and the third conductive member to each other;
• wherein
• the first conductive member and the third conductive member do not overlap each other when viewed in the direction perpendicular or substantially perpendicular to the first main surface;
• the second conductive member, the third conductive member, and the plurality of connections define at least a portion of a loop of a magnetic field antenna in the first frequency band;
• and
• the power supply coil is disposed between a plane including the first main surface and a plane including the second main surface and closer to the third conductive member than to the first conductive member, and is disposed in an orientation interlinking a magnetic flux passing through the power supply coil and the loop to each other.

An electronic device comprising:

• an antenna device;
• and
• a housing;
• wherein
• the antenna device includes:
• a power supply coil including a coil-shaped conductor, the power supply coil being coupled to a power supply circuit that operates in a first frequency band;
• a first conductive member including a first main surface;
• a second conductive member including a second main surface including at least a portion thereof that opposes the first main surface;
• a third conductive member that has an area that is smaller than an area of the first conductive member when viewed in a direction perpendicular or substantially perpendicular to the first main surface;
• and
• a plurality of connections that couple the first conductive member and the third conductive member to each other;
• the first conductive member and the third conductive member do not overlap each other when viewed in the direction perpendicular or substantially perpendicular to the first main surface;
• the first conductive member, the third conductive member, and the plurality of connections define at least a portion of a loop of a magnetic field antenna in the first frequency band;
• and
• the power supply coil is disposed between a plane including the first main surface and a plane including the second main surface and closer to the third conductive member than to the first conductive member, and interlinks a magnetic flux passing through the power supply coil and the loop to each other.

An electronic device comprising:

• an antenna device;
• and
• a housing;
• wherein
• the antenna device includes:
• a power supply coil including a coil-shaped conductor, the power supply coil being coupled to a power supply circuit that operates in a first frequency band;
• a first conductive member including a first main surface;
• a second conductive member including a second main surface including at least a portion thereof that opposes the first main surface;
• a third conductive member that has an area that is smaller than an area of the first conductive member when viewed in a direction perpendicular or substantially perpendicular to the first main surface;
• and
• a plurality of connections that couple the second conductive member and the third conductive member to each other;
• the first conductive member and the third conductive member do not overlap each other when viewed in the direction perpendicular or substantially perpendicular to the first main surface;
• the second conductive member, the third conductive member, and the connections define at least a portion of a loop of a magnetic field antenna in the first frequency band;
• and
• the power supply coil is disposed between a plane including the first main surface and a plane including the second main surface and closer to the third conductive member than to the first conductive member, and interlinks a magnetic flux passing through the power supply coil and the loop to each other.