Method for increasing card reading distance of RFID coil

The invention discloses a method for increasing a card reading distance of an RFID (Radio Frequency Identification) coil, which relates to the technical field of radio frequency identification and comprises the following steps of: selecting a proper radio frequency antenna according to application requirements and environmental conditions, determining the number of turns of the antenna, adding a coupling coil around the antenna, and adjusting the position of the coupling coil. According to the working frequency and the system performance requirement, the length of the antenna, the resistance parameter of the coupling coil and the capacitance parameter of the coupling coil are adjusted, and a driving circuit of the antenna is optimized. By adjusting the resistance parameter and the capacitance parameter of the coupling coil, the phase of the antenna at a specific frequency and the resonant frequency of the coupling coil can be changed, so that the antenna can work better at the specific frequency, the performa