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Smartcard performance enhancement circuits and systems

A technology of smart card chip and sending circuit, which is used in transmission systems, near-field transmission systems, and near-field transmission systems in radio frequency identification systems.

Active Publication Date: 2014-02-05
爱卡色公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the size of the antenna proved to be an obstacle to further miniaturization of passive RFID tags

Method used

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  • Smartcard performance enhancement circuits and systems
  • Smartcard performance enhancement circuits and systems
  • Smartcard performance enhancement circuits and systems

Examples

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Embodiment Construction

[0045] In the following description, reference is made to the accompanying drawings, which show, for purposes of illustration, various specific embodiments of the invention. These specific embodiments are described in detail to enable those skilled in the art of the invention to practice the invention. It should be understood that the various embodiments of the invention, although different, are not necessarily mutually exclusive. For example, a particular feature, structure or characteristic described in connection with one embodiment may be implemented in other embodiments without departing from the spirit and scope of the invention. In addition, it is to be understood that the location or arrangement of individual components within each specific embodiment disclosed may be modified without departing from the spirit and scope of the invention. Therefore, the following embodiments are not intended to be limiting, and the scope of the present invention is only defined by prop...

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Abstract

An RFID card includes a smartcard controller that receives power from a host device. The RFID card also includes a small inductive device capable of inductive coupling with an RFID reader. The small inductive device is small enough to fit in the form factor of a memory card or SIM card. Enhancement circuits enhance the usable read and write distance of the RFID card.

Description

technical field [0001] The present invention relates generally to contactless communication devices, and more particularly to contactless smart card devices. Background technique [0002] Radio frequency identification "tags" (RFID tags) can be divided into two broad categories: active tags and passive tags. Active tags are characterized by a local power source, such as a battery. Active tags generally transmit information by broadcasting on a selected RF carrier frequency using a locally generated RF carrier. Active tags are usually used to transmit over long distances, often referred to as "far field communications (FFC)". The antennas used by active RFID tags tend to be large to allow long-distance communication. [0003] Passive tags are not powered. Passive tags derive the energy needed to power the tag from the interrogating RF field and use this energy to transmit a response code by modulating the impedance presented by the antenna to the interrogating field, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/077
CPCG06K19/073G06K19/0701G06K19/07732G06K19/0723G06K19/07769Y02D30/70H04B5/70H04B5/77G06K19/0727G06K19/0726G06Q20/204H04B1/3816G06K19/07749G06K19/0715G06Q20/3278
Inventor 锡瓦·纳兰德绍拉夫·查克拉博蒂普拉巴卡尔·泰德保利
Owner 爱卡色公司