Magnetic core member for antenna module, antenna module and portable information terminal equipped with antenna module
First Claim
1. A magnetic core member for an antenna module, said member stacked for a loop-shaped antenna coil, characterized in that:
- a recess is provided on a surface thereof facing said stacked antenna coil, at least in an area facing the loop portion of said antenna coil.
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Accused Products
Abstract
There are provided a magnetic core member for an antenna module capable of improving a communication distance without thickening the module, an antenna module, and a portable information terminal equipped with the antenna module. A magnetic core member 18 for an antenna module 10 of the present invention has a ring groove 18c as a recess portion formed on the surface on the side stacking an antenna coil 15 in an area facing a loop portion of the antenna coil 15. An eddy current generated in the magnetic core member 18 in a high frequency magnetic field is concentrated on the surface of the magnetic core member 18 on the side stacking the antenna coil 15 in the area facing the loop portion of the antenna coil 15. According to the present invention, a ring groove 18c is provided in the area to reduce an amount of eddy currents to be generated and improve the communication distance characteristics of the antenna module.
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Citations
17 Claims
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1. A magnetic core member for an antenna module, said member stacked for a loop-shaped antenna coil, characterized in that:
a recess is provided on a surface thereof facing said stacked antenna coil, at least in an area facing the loop portion of said antenna coil. - View Dependent Claims (2, 3, 4)
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5. An antenna module having a loop-shaped antenna coil formed on a base, said base stacked by a magnetic core member, said antenna module characterized in that:
said magnetic core member is provided with a recess formed on a surface on which said base is stacked, at least in an area facing the loop portion of said antenna coil. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A portable information terminal having a housing wherein a base for supporting a loop-shaped antenna coil, a magnetic core member stacked on said base, and a metal shield plate stacked on said magnetic core member are mounted in the housing, said portable information terminal characterized in that:
said magnetic core member is provided with a recess formed on a surface on which said base is stacked, at least in an area facing the loop portion of said antenna coil. - View Dependent Claims (14, 15, 16, 17)
Specification