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Isolating device for UHF-band RFID reader

An isolation device and reader technology, applied in the field of radio frequency identification, can solve the problems of increased manufacturing cost and size, difficulty in achieving isolation, and expensive circulators, and achieve the effects of improving transceiver isolation, low cost, and solving carrier leakage

Inactive Publication Date: 2010-06-02
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the isolation between the transmitter and receiver of the reader, the first method is to use two antennas with different polarizations, which are respectively connected to the transmitter and receiver of the RFID reader for transmission and reception, but this This approach results in a multiplied increase in manufacturing cost and size
The second is to use a circulator made of ferrite materials to achieve the effect of transceiver isolation, but the circulator is expensive, large in size, and generally difficult to meet the system requirements for isolation

Method used

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  • Isolating device for UHF-band RFID reader
  • Isolating device for UHF-band RFID reader
  • Isolating device for UHF-band RFID reader

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] According to the principle of reciprocity characteristics of the four ports of the directional coupler (input port pin1, output port pin2, isolation port pin3, coupled output port pin4), such as figure 1 and figure 2 As shown, when the transmission signal is input by pin1 through the power amplification and filtering unit, pin2 is the output port, which can be connected to the antenna unit to radiate the signal. When the antenna unit receives the response signal of the tag and is input by pin2, pin3 is now used as the coupling port of the tag response signal, and the tag response signal received by the antenna unit is coupled and output to the receiving unit, and pin3 is input by pin1 The isolation port can effectively attenuate the leakage of the transmission signal of the pin1 pin and the reflection of the transmission signal caused by the mi...

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Abstract

The invention relates to an isolating device for a UHF-band RFID reader, which comprises a power amplifying and filtering unit, an antenna unit, a receiving unit and a directional coupler unit, wherein the input port (pin 1) of the directional coupler unit is connected with the power amplifying and filtering unit; the output port (pin 2) is connected with the antenna unit; and the isolating port (pin 3) is connected with the receiving unit. The isolating device for the UHF-band RFID reader has the advantages that: due to the adoption of a coupler unit, the isolating device improves the isolation of the receiving and the transmitting of an RFID reader, can effectively solve the problem of carrier leak, and is particularly suitable to be used in a space with a complex internal environment (for example, the internal space of a handheld RFID reader).

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to an isolation circuit of a directional coupler capable of improving the transceiver isolation degree of an RFID reader. Background technique [0002] Radio Frequency Identification (RFID, Radio Frequency Identification) technology is an automatic identification technology that began to emerge in the 1990s. Radio Frequency Identification technology is a technology that uses radio frequency signals to achieve non-contact information transmission through spatial coupling (alternating magnetic fields or electromagnetic fields). The technology by which the information transmitted achieves the purpose of identification. Radio frequency identification (RFID) technology has been more and more widely used now, especially the ultra high frequency (UHF) frequency band radio frequency identification technology, which has very huge development potential. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
Inventor 阚能华袁勇刘玲玲张强
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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