Antenna device and mobile terminal

摘要

This disclosure provides an antenna device including an antenna coil having a plate-shaped magnetic core with first and second main surfaces and a coil conductor wound around the magnetic core, and a flat conductor adjacent to the antenna coil. For instance, the flat conductor can be a ground electrode formed on or within a circuit substrate. The coil conductor includes a first conductor portion adjacent to the first main surface of the magnetic core and a second conductor portion adjacent to a second main surface thereof. The first conductor portion of the antenna coil is closer to an end portion of the flat conductor than the second conductor portion, with the second main surface of the magnetic core facing the flat conductor.

主权项

1. An antenna device comprising:
an antenna coil, the antenna coil comprising:
a plate-shaped magnetic core having first and second main surfaces, a length of the plate-shaped magnetic core being larger than a thickness of the magnetic core as measured from the first main surface to the second main surface; anda coil conductor wound around the magnetic core; and a flat conductor adjacent to the antenna coil, wherein the antenna coil is provided at or proximal to an end portion of the flat conductor and on or over a surface of the flat conductor opposite to a surface thereof facing an antenna of a communication partner, a first conductor portion of the coil conductor is adjacent to a first main surface of the magnetic core, a second conductor portion of the coil conductor is adjacent to the second main surface of the magnetic core, and said first and second conductor portions do not overlap each other in a perspective plan view of the magnetic core, the second main surface of the magnetic core faces the flat conductor, and the first conductor portion is closer to the end portion of the flat conductor than the second conductor portion.