Design And Application Of RFID Label For Airborne Oxygen Bottle

Nowadays,with the application situations’incrassation,the radio frequency identification(RFID)technology has been developed in large part.In the same time,how to research and develop RFID antennas which can suit the different situations has also become a significant problem.In the civil aviation area,the mainstream material in the aircraft manufacture is also metal material.What’s more,the important components and equipment on the aircrafts are also made by metal material.The oxygen system is a vital system on the aircraft for it is used to keep the crew and passengers alive in the high-altitude situation.Therefore,ensuring the oxygen system in the airworthiness is one of the important items in the aircraft maintenance.As the core component in the oxygen system,the on-board oxygen cylinder is also made by metal material.Consequently,design a RFID antenna which can suit the metal material environment on the oxygen cylinder is significant to improve the aircraft maintenance’s efficiency and reliability.To solve the problem that the conventional RFID tags cannot work well on the oxygen cylinder,author design a dipole antenna,which the size is 60×30×1.6 mm~3.And analyzing the effect that the metal material exerts to the working performance of the conventional tags.On this basis,using Monza R6-P chip,Rogers 5880 dielectric substrate,and adjusting the T-type matching network and bending arm,an anti-metal RFID tag was finally designed,with a size of 42×29×1.6mm~3.The size of the new antenna is 32.3%smaller than that of conventional antennas.And the performance in the working environment required by airworthiness standards was also experimentally verified.The results show that the actual measured maximum reading distance is 4.6m in China’s UHF RFID frequency band(920 MHz～925 MHz).And the reading performance on metal surfaces of different sizes is relatively stable,which meets the design requirements of SAE AS5678,the airworthiness standard for airborne passive RFID tags.Aiming at the problem that the electric tags need to be co-typed with the on-board oxygen cylinder in practical engineering applications,a tag antenna that can be co-type with the ring structure of the oxygen cylinder is designed.Based on the microstrip antenna infrastructure,the author add the rectangular gaps and short-circuit walls and the short-circuit wall structure can better combine the tag antenna with the metal matrix.Firstly,a miniaturized wideband anti-metal RFID tag with a size of 42.7×16×1.6mm~3 was designed.On this basis,by adjusting the rectangular gap and the feed structure,an anti-metal tag with a size of 46×20×1.6mm~3 and a bandwidth of 100MHz and can be co-shaped with the vehicle was finally designed.Experiments show that the maximum reading distance is 4.6m in the North American UHF RFID frequency band(902 MHz～928 MHz).And in the performance test in the actual oxygen cylinder installation environment,the tag reading distance is 1.6m,which meets the design requirements of anti-metal tags in the airworthiness standard of airborne passive RFID tags.At the same time,it meets the design requirements of low-cost and wide-band and has high practical application value.