Antenna device and communication device using antenna device
First Claim
1. A communication apparatus that makes data communications with a contactless integrated circuit card by electromagnetic inductive coupling, the communication apparatus comprising:
- a loop coil for electromagnetic inductive coupling;
a magnetic member disposed near a metallic member facing a main side of the loop coil, opposite to a side facing the integrated circuit card, and wherein the magnetic member has a specific permeability μ
′ and
product Ms·
t of saturation magnetization Ms and thickness t thereof set based on a range set for facilitating communications with the contactless integrated circuit card;
a modulating means for modulating data for transmission to the contactless integrated circuit card, the modular means having a predetermined carrier frequency and supplying modulated data to the loop coil; and
a demodulating means for demodulating data received by the loop coil from the contactless integrated circuit card.
1 Assignment
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Accused Products
Abstract
An antenna apparatus (60) is provided which is used in a recorder and/or player to write and read data to and from a contactless IC card (1). The antenna apparatus (60) includes a loop coil (61) to radiate an electromagnetic field for magnetic coupling with a loop coil (4) at the IC card (1) to send and receive data to and from the IC card (1), and a magnetic sheet (62) disposed to face the main side of the loop coil (61), opposite to the main side facing the IC card (1). The magnetic sheet (62) has the specific permeability μ′ and product Ms·t of saturation magnetization Ms and thickness t thereof set in accordance with a necessary range of communications with the contactless IC card (1).
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Citations
4 Claims
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1. A communication apparatus that makes data communications with a contactless integrated circuit card by electromagnetic inductive coupling, the communication apparatus comprising:
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a loop coil for electromagnetic inductive coupling; a magnetic member disposed near a metallic member facing a main side of the loop coil, opposite to a side facing the integrated circuit card, and wherein the magnetic member has a specific permeability μ
′ and
product Ms·
t of saturation magnetization Ms and thickness t thereof set based on a range set for facilitating communications with the contactless integrated circuit card;a modulating means for modulating data for transmission to the contactless integrated circuit card, the modular means having a predetermined carrier frequency and supplying modulated data to the loop coil; and a demodulating means for demodulating data received by the loop coil from the contactless integrated circuit card. - View Dependent Claims (2, 3, 4)
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Specification