far field communication (FFC)

The term Far Field Communication (FFC) is used for RFID, among other things. To distinguish it from near field communication( NFC), far field communication takes place in a distance range that is greater than the emitted wavelength of the RFID reader.

At a frequency of 869 MHz, the far-field range is at a distance of more than 35 cm. The field strength of the far-field signal decreases with the square of the distance from the antenna. The same is true for acoustic sound waves. The far-field is defined in acoustics as the distance at which the distance to the sound source is large compared to the wavelength. The sound pressure and the sound velocity are then proportional to each other.

In contrast to far-field communication, near-field communication occurs within the distance of the wavelength. In the microwave range, this would be a distance within 12 cm at a frequency of 2.5 GHz. In this range, the field strength decreases cubically with distance.