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Communication device, antenna device, and communication system

A communication device and communication signal technology, applied in antennas, near-field transmission systems using transceivers, loop antennas, etc., can solve problems such as barriers to performance improvement of non-contact communication systems

Active Publication Date: 2010-12-01
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] In general, comparing the electric field strength and magnetic field strength of the radio waves that can be output from the same loop antenna, the electric field strength is currently subject to stricter restrictions (restricted to a lower value)
Therefore, in a non-contact communication system using a loop antenna magnetic field coupling, the output electric wave is limited by the limit value of the electric field strength
This may be an obstacle to the performance improvement of the contactless communication system, such as extending the communication distance and increasing the speed

Method used

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  • Communication device, antenna device, and communication system
  • Communication device, antenna device, and communication system
  • Communication device, antenna device, and communication system

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Embodiment Construction

[0099] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0100] Figure 18 The antenna shape of a common NFC-compliant card is illustrated. The shown antenna has a structure in which, in the shape of an IC card, a rectangular antenna coil is formed along the outer periphery of the card to secure as much power as possible. When such an antenna for magnetic field coupling is included in a cellular phone, mobile communication device or other small information device, metal parts (including a battery pack) are realized in a high density in the housing. Therefore, it is assumed that the antenna is arranged near a metal surface. In this case, eddy currents are generated on the metal surface. The reverse magnetic field caused by this eddy current suppresses the initial magnetic field used in communication, thereby deteriorating communication characteristics. Figure 26 The state where the magnetic flux is inciden...

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Abstract

The invention relates to a communication device, an antenna device and a communication system. A communication device includes a conductor plane, a first loop antenna disposed on one surface of the conductor plane via a first magnetic sheet, a second loop antenna being in a loop direction opposite to a loop direction of the first loop antenna and having an opening structure approximately identical in shape to the first loop antenna, the second loop antenna being disposed on another surface of the conductor plane via a second magnetic sheet so as to be roughly superposed on the first loop antenna, and a communication circuit processing a communication signal transmitted and received by the first and second loop antennas.

Description

technical field [0001] The present invention relates to a communication device that performs a communication operation in a contactless communication manner as a reader / writer (initiator) that transmits a request command or as a responder (target) that returns a response command in response to a request command , also relates to an antenna device used in contactless communication. In particular, the present invention relates to a communication device, an antenna device, and a communication system that perform non-contact communication through loop antenna electromagnetic induction. Background technique [0002] In a communication system, a communication terminal that does not itself have a radio wave generation source wirelessly transmits data to a communication counterpart (counterpart). As such a communication system, non-contact communication called a radio frequency identification (RFID) system The system is applied to many contactless IC cards. An RFID system includes...

Claims

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Application Information

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IPC IPC(8): G06K19/077G06K17/00H01Q7/00H01Q21/00G06K19/07H01Q7/06H04B5/02
CPCH01Q7/00
Inventor 后藤哲郎桦泽宪一高野正也平野一弥
Owner SONY CORP
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