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Automatic elimination method of RFID (radio frequency identification device) receiving circuit carrier and circuit thereof, and reader circuit

A technology of receiving circuit and receiving link, which is applied to instruments, computer parts, and cooperating devices, etc., can solve problems such as carrier leakage, receiver DC offset, circuit flicker noise, etc., so as to improve suppression accuracy and improve carrier suppression. , the effect of improving the inhibitory effect

Active Publication Date: 2015-05-13
浙江海康科技有限公司
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AI Technical Summary

Problems solved by technology

The reader transmits a high-power carrier signal through the radio frequency module. The carrier signal leaks into the front end of the receiver through a directional coupler or a circulator. The energy of the leaked signal is much greater than the energy of the received signal. The coupling mechanism causes the transmitted and received signals to be at the same carrier frequency, and the leaked signal energy will seriously affect the dynamic range of the receiving link, that is, affect the receiving sensitivity of the entire RFID system
In the UHF RFID system, in addition to carrier leakage, circuit flicker noise and receiver DC offset will also reduce the receiving sensitivity of the reader

Method used

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  • Automatic elimination method of RFID (radio frequency identification device) receiving circuit carrier and circuit thereof, and reader circuit
  • Automatic elimination method of RFID (radio frequency identification device) receiving circuit carrier and circuit thereof, and reader circuit

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Embodiment Construction

[0029] In order to make it easy to understand the technical means, creative features, goals and effects achieved by the patent of the present invention, the following describes the patent of the present invention in conjunction with specific illustrations.

[0030] See figure 1 A typical RFID system consists of two parts: a reader and a tag. The reader generally includes a main control, a radio frequency module and an antenna. The tag generally contains a chip on a chip and a microstrip antenna. The reader and the tag realize the spatial transmission of data through the coupling between their respective antennas.

[0031] See figure 2 The figure shows a schematic block diagram of the circuit structure of an RFID reader based on the carrier elimination method of the present invention, including a radio frequency module (not shown), a detector A module, a detector B module, a detector C module, and a detector D module , AGC\AGL power scaling module, phase adjustment module, MCU m...

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Abstract

The invention discloses a technical field of a RFID (radio frequency identification device), and discloses an automatic elimination method of RFID receiving circuit carrier and a circuit thereof, and a reader circuit. Through a directional coupler, an inhibiting carrier signal source with the same frequency and signal as a carrier signal input from an emitting end is obtained from an emitting chain; the inhibiting carrier signal source performs a power scaling so that its power is equal to the power of a leakage carrier signal of a receiving end; through a phase adjusting, the phase difference between the inhibiting carrier signal source and the input carrier signal is 180 degrees, and a reverse carrier signal is obtained; and then the reverse carrier signal is coupled to a receiving chain through the directional coupler, and thereby the leakage carrier in a receiving circuit is eliminated. The automatic carrier elimination method is easy to realize, and the best effect of carrier inhibition-30 dbc can be reached.

Description

Technical field [0001] The patent of the present invention belongs to the field of RFID technology, and mainly relates to the technology of removing the carrier of the RFID receiving circuit, specifically, it is a method for automatically removing the carrier of the RFID receiving circuit, which is especially suitable for UHF RFID systems. Background technique [0002] RFID (Radio Frequency Identification) is a radio frequency identification technology, also known as radio frequency identification. It is a wireless communication technology that can identify specific targets and read and write related data through radio signals without the need to establish mechanical or optical connections between the identification system and specific targets contact. A typical RFID system consists of two parts: RFID Reader and Tag. The reader generally includes a main control, radio frequency module and antenna, and the external interface has various changes according to different needs. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K17/00
Inventor 吴光荣陈军慧李昆仑陈善靖齐国强杨登辉杜红伟
Owner 浙江海康科技有限公司
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