Test system and method for receiving sensitivity of uhf frequency band rfid radio frequency tag chip

Abstract

The invention discloses a system and a method for testing the reception sensitivity of a UHF-band RFID radio frequency tag chip. The system comprises a card reader chip, a power amplification module, a circulator and an RFID radio frequency tag chip. The input port of the circulator is connected with an emission channel of the card reader chip, and an isolated port of the circulator is connected with a reception channel of the card reader chip. The test system also comprises an adjustable attenuator which is connected between the power amplification module and the input port of the circulator; and an LC matching circuit which is used for being matched with an equivalent antenna and is connected between the output port of the circulator and the RFID radio frequency tag chip. In the system and the method for testing the reception sensitivity of the UHF-band RFID radio frequency tag chip, the adjustable attenuator is added between the emission channel of the card reader chip and the circulator, and is used for adjusting the intensity of a signal that reaches the RFID radio frequency tag chip from the emission channel, and reflected signals of the RFID radio frequency tag are separated from the emission signals of an RFID card reader to the hilt through the circulator at the RFID radio frequency tag terminal.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and the Internet of Things, and in particular relates to a testing system and method for receiving sensitivity of a UHF frequency band RFID radio frequency tag chip. Background technique [0002] With the development of Internet of Things technology and the construction of smart cities, more and more radio frequency identification (RFID) technology has been applied to various fields, and more and more products of different frequency bands have appeared in the public's sight. Common UHF frequency band RFID products basically realize information query through short-distance wireless communication between RFID card readers and tags of various forms based on RFID radio frequency tag chip design. [0003] In the design stage of existing RFID system products, the transmitting power and receiving sensitivity of the RFID card reader and the receiving sensitivity of the RFID radio frequency ...

AI Technical Summary

Problems solved by technology

Among these technical parameters, the receiving sensitivity of the RFID card reader and the receiving sensitivity of the RFID radio frequency tag are relatively difficult to test. The reason is that when the RFID system is working, the transmitted signal of the card reader will leak to the receiving channel through the circulator. The operating frequency of the signal reflected by the RFID radio frequency tag chip is the same and exists at the same time. Therefore, the bottom broadband noise of the leaked signal will cause the signal-to-noise ratio of the reflected signal of the RFID radio frequency tag to deteriorate, and the reader cannot demodulate the reflected signal of the RFID radio frequency tag in time. like figure 1 shown

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