Antenna device and communication terminal apparatus

摘要

An antenna device includes an antenna coil including a first conductive pattern disposed on a first major surface of a magnetic sheet, a second conductive pattern disposed on a first major surface of a non-magnetic sheet, and an interlayer conductor connecting the first conductive pattern and second conductive pattern. The antenna coil including the first conductive pattern and second conductive pattern defines a spiral or substantially spiral pattern. The antenna device is a resin multilayer structure in which its base body is a laminate of the magnetic layer and non-magnetic layer and the predetermined patterns are disposed inside and outside the laminate.

主权项

1. An antenna device comprising:
a plurality of layers including at least a magnetic layer; at least one first conductive pattern having a half-loop shape or a linear shape, including one or more layers, and being adjacent to a first major surface of the magnetic layer; at least one second conductive pattern having a half-loop shape or a linear shape, including one or more layers, and being adjacent to a second major surface of the magnetic layer; an interlayer conductor included in the plurality of layers and connecting the first conductive pattern and the second conductive pattern; and an antenna coil including one turn or a plurality of turns, and including the at least one first conductive pattern, the at least one second conductive pattern, and the interlayer conductor, wherein the plurality of layers includes one or more non-magnetic layers adjacent to the first major surface of the magnetic layer and a plurality of non-magnetic layers adjacent to the second major surface of the magnetic layer, the first conductive pattern is disposed on the magnetic layer and the non-magnetic layer adjacent to the first major surface of the magnetic layer, and the second conductive pattern is disposed on the non-magnetic layer adjacent to the second major surface of the magnetic layer.