Antenna Module-Use Magnetic Core Member, Antenna Module, and Portable Information Terminal Having the Same
First Claim
1. An antenna module-use magnetic core member to be stacked on an antenna coil, characterized in that:
- said antenna module-use magnetic core member has a performance index, expressed by μ
′
×
Q, of 300 or higher, where a reciprocal of a loss factor (tan δ
=μ
″
/μ
′
) expressed by a real part μ
′ and
an imaginary part μ
″
of a complex permeability at an applied frequency is set as Q.
1 Assignment
0 Petitions
Accused Products
Abstract
There are provided an antenna module-use magnetic core member, an antenna module and a portable information terminal provided with the same, capable of improving a communication distance without increasing a module thickness. In an antenna module (1) in which a sheet-formed magnetic core member (4) is stacked on an antenna substrate (2) on which a looped antenna is formed, one having a performance index, expressed by μ′×Q, of 300 or higher when Q is a reciprocal of a loss factor (tan δ=μ″/μ′) expressed by a real part μ′ and an imaginary part μ″ of a complex permeability at an applied frequency is used as the magnetic core member (4).
93 Citations
14 Claims
-
1. An antenna module-use magnetic core member to be stacked on an antenna coil, characterized in that:
said antenna module-use magnetic core member has a performance index, expressed by μ
′
×
Q, of 300 or higher, where a reciprocal of a loss factor (tan δ
=μ
″
/μ
′
) expressed by a real part μ
′ and
an imaginary part μ
″
of a complex permeability at an applied frequency is set as Q.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
9. An antenna module having a magnetic core member stacked on a support member formed with an antenna coil, characterized in that:
said antenna module has a performance index, expressed by μ
′
×
Q, of 300 or higher where a reciprocal of a loss factor (tan δ
=μ
″
/μ
′
) expressed by a real part μ
′ and
an imaginary part μ
″
of a complex permeability at an applied frequency is set as Q.- View Dependent Claims (10, 11, 12, 13)
-
14. A portable information terminal having incorporated in a housing a support member for supporting an antenna coil, a signal processing circuit unit electrically connected to said antenna coil and disposed on an inner circumferential side of said antenna coil, a magnetic core member stacked on said support member and a metal shield plate stacked on said antenna coil, said portable information terminal being characterized in that:
said magnetic core member has a performance index, expressed by μ
′
×
Q, of 300 or higher, where a reciprocal of a loss factor (tan δ
=μ
″
/μ
′
) expressed by a real part μ
′ and
an imaginary part μ
″
of a complex permeability at an applied frequency is set as Q.
Specification
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- Resources
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsSugawara, Toshiaki, Akiho, Hiraku, Takahashi, Isao, Yokota, Toshiaki
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Application NumberUS11/568,061Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current343/787CPC Class CodesH01Q 1/243 with built-in antennasH01Q 7/06 with core of ferromagnetic ...
