Active mini near field communication antenna system

A wireless communication and antenna system technology, which is applied in the field of active miniature short-distance wireless communication antenna system, can solve the problems of large antenna structure and difficulty in integrating micro-systems, and achieve antenna size, miniaturization, and structural size reduction Effect

Active Publication Date: 2014-12-24
ESPRESSIF SYST SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the use of large antennas is difficult to integrate into micro-systems due to their large structure

Method used

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  • Active mini near field communication antenna system

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Embodiment Construction

[0009] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0010] Such as figure 1 As shown, an embodiment of an active miniature short-distance wireless communication antenna system is disclosed, which is driven by an external power supply instead of the passive system in the prior art, so that the antenna system uses a small-sized antenna for information transmission.

[0011] The antenna system in this embodiment is an antenna system provided in a card reader for near field communication. The card reader communicates with the NFC card through the antenna system.

[0012] The antenna system comprises an antenna 1 , and an NFC system-compatible receiver 2 and an active transmitter 3 which are respectively electrically connected to the antenna 1 .

[0013] The length and width of the antenna 1 are both less than 3 cm. It is a near-field coupling antenna. Since the 13.56Mhz wavelength is very long and the ...

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Abstract

The invention discloses an active micro near field communication antenna system, which comprises an antenna, and a receiver and a transmitter respectively connected with the antenna, wherein the transmitter comprises an active transmission circuit connected with the antenna, a modulation-demodulation system connected with the active transmission circuit by a circuit, and a digital transmission system connected with the modulation-demodulation system by the circuit. The transmitter mentioned in the invention is provided with the active transmission circuit, and the antenna system adopts an active transmission mode, so that the antenna system can adopt a small-size antenna to present an effect like the transmission of a large antenna, thereby providing possibility for reducing the structural size of the antenna, realizing reduction of the size of the antenna, and making the antenna system be conveniently integrated in a system small in size.

Description

technical field [0001] The invention relates to a near-field communication system, in particular to an active miniature short-distance wireless communication antenna system. Background technique [0002] At present, in the short-distance wireless communication of the prior art, the passive antenna system often uses the wireless communication between the antenna and the card reader, and the system relies on modulating the impedance of the antenna to change the reflection of the antenna to achieve the effect of transmission. The NFC card in the existing wireless communication is passive, and the card reader needs to detect the change of the impedance of the antenna of the NFC card. The antenna reflects the carrier wave back to the card reader system. By changing its impedance, the data is modulated into the reflected signal. However, because the reflected energy efficiency is small, the antenna needs to be relatively large. If the antenna is too small, the card reader cannot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B5/02H04B1/04
Inventor 张瑞安
Owner ESPRESSIF SYST SHANGHAI
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