Panasonic Corporation announced that it has developed a secure near field communication technology (hereinafter, “PaWalet Link”) using a loop antenna by applying Wavelet OFDM*2 to a communication method using a magnetic field. As a result, it is possible to limit the communication range from a few millimeters to tens of centimeters. This technology can easily control the communication range by controlling the size of the loop antenna and the transmission power of the communication device.