RFID tag information reading apparatus and method

A radio frequency identification (RFID) tag information reading method, applied to an RFID tag reading apparatus, and the RFID tag reading apparatus comprises:

• a signal management circuit, a resonant circuit and a decoding identification circuit;
• the signal management circuit is connected with the resonant circuit, and the resonant circuit is connected with the decoding identification circuit;
• the RFID tag reading method comprises:
• outputting an operation frequency signal through the signal management circuit;
• receiving the operation frequency signal through the resonant circuit, adjusting a capacitance value and an inductance value of the resonant circuit according to the operation frequency signal, and generating a resonance for generating a sine wave signal at a frequency point of the operation frequency signal;
• generating an electromagnetic wave from the sine wave signal through the resonant circuit, radiating the electromagnetic wave to an RFID tag, and triggering the RFID tag to return a tag identity signal;
• and
• identifying RFID tag information through the decoding identification circuit according to the tag identity signal returned by the RFID tag;
• the RFID tag reading apparatus further comprises a capacitance dynamic adjustment circuit and a processing unit, wherein the resonant circuit is respectively connected with the capacitance dynamic adjustment circuit and the processing unit, and the capacitance dynamic adjustment circuit comprises multiple groups of capacitors;
• the adjusting the capacitance value and the inductance value of the resonant circuit according to the operation frequency signal specifically comprises:
• connecting any group number of capacitors of the multiple groups of capacitors to the resonant circuit respectively through the capacitance dynamic adjustment circuit to obtain M groups of access resonant capacitors with different capacitance values;
• obtaining M groups of different sine wave signals through the resonant circuit according to the M groups of different access resonant capacitors;
• determining a resonant capacitance when the resonant circuit generates a resonance through the processing unit according to a maximum value of the sine wave signals, wherein an inductance value of the resonant circuit is set to a fixed value, and M is a positive integer greater than or equal to 2.