Patent ID: 8146800

Claim:
An apparatus for detecting and recognizing a security code of a security product having an Electromagnetic Band-Gap (EBG) pattern arranged on the security product, the EBG being configured to resonate at a specific frequency, the apparatus comprising: a voltage controlled oscillator configured to sequentially generate one or more incident signals having various frequencies; a power divider configured to divide power of each of the one or more incident signals generated by the voltage controlled oscillator into halves, and to output a first incident signal and a second incident signal; a waveguide configured to enable the first incident signal to be incident on the EBG pattern, and to receive a reflected signal from the EBG pattern; a phase detector configured to detect a phase difference between the reflected signal received from the waveguide and the second incident signal received from the power divider, and to generate and output phase data the detected phase difference; and a data control unit configured to determine whether the security code having the EBG pattern is recognized by using the phase data received from the phase detector, and to control the voltage controlled oscillator to sequentially generate the incident signal.