Near-Field vs. Far-Field RFID Antennas
Near-field and far-field RFID antennas differ primarily in their communication method and read range. Near-field antennas use a magnetic, non-propagating field (inductive coupling) for short-range communication, typically up to 15-30 centimeters. Far-field antennas use a propagating electromagnetic wave (capacitive coupling or backscatter) for long-range communication, reaching up to 15 meters or more. The choice between them depends on the specific application’s need for range versus precision.