RFID transponders´ RF emissions in aircraft communication and navigation radio bands

Radiated emission data in aircraft communication and navigation bands are presented for several active radio frequency identification (RFID) tags. The individual tags are different in design, operation and transmitting frequencies. The process for measuring the tags´ emissions in a reverberation chamber is discussed. Measurement issues dealing with tag interrogation, low level measurement in the presence of strong transmissions, and tags´ low duty factors are discussed. The results show strong emissions, far exceeding aircraft emission limits and can be of potential interference risks.