THE REALIZATION OF RADIO FREQUENCY IDENTIFICATION HANDSET ANTENNA BASED ON INTERNET OF THINGS

Abstract

Radio frequency identification (RFID) as an automatic identification technology is one of the core technologies of Internet of Things.  RFID handset is known for its light and portable characteristics; therefore, reducing the volume of RFID antenna which is the forefront and important component of RFID system without influencing working distance is an important direction of its design.  According to the rules of information exchange and communication based on Internet of Things, this study investigated the effects of antenna parameters on system performance using a passive RFID system.  It was found that, when the read-write distance was fixed, the higher the frequency was, the larger the one-way space loss would be; for antennae with the same structure size, higher frequency could bring better gain effects; the polarization property of antennae was the same as the polarization property of electromagnetic waves; the matching of the polarization of receiving antenna and incoming wave could induce polarization loss.  A kind of RFID near-field antenna which was suitable for near-distance reading was designed through analyzing the design principles of a kind of microstripfed monopole near-field antenna.  Then the antenna was manufactured based on simulation using High Frequency Structure Simulator (HFSS).  The actual test suggested that the front end of the antenna could read the tags which were 6 cm away and 3 to 4 tags at once, which was applicable to actual application environment.