Antenna apparatus

摘要

There is provided an antenna apparatus capable of stably communicating with a communication partner and increasing the maximum possible communication range even when the antenna apparatus is relatively smaller than an antenna in the communication partner and the two antennas are disposed in close proximity on the same axis. A magnetic flux passing through a coil aperture of an antenna coil passes through a conductor aperture of a conductive layer, but the magnetic flux does not pass through the conductive layer. Accordingly, the magnetic flux is diverted to a path in which the conductor aperture of the conductive layer is the inside and the outer edge of the conductive layer is the outside. As a result, the magnetic flux passing through the coil aperture of the antenna coil makes a relatively large loop and links the inside and the outside of a coil conductor in an antenna in a communication partner with the antenna apparatus.

主权项

1. An antenna apparatus comprising:
a coil conductor including a coil aperture at a winding center of the coil conductor; a conductive layer located in close proximity to the coil conductor so that a current flows through the conductive layer due electromagnetic field coupling of the conductive layer with the coil conductor; and a radiation plate located in close proximity to the conductive layer so that a current flows through the radiation plate due to electromagnetic field coupling of the radiation plate with the conductive layer; wherein the antenna apparatus is configured to communicate with an antenna in a communication partner via a magnetic field in an HF band.