RFID Tags Mountable on Metallic Surface
Espejo Delzo, Karina Magaly (2010)
Espejo Delzo, Karina Magaly
2010
Sähkötekniikan koulutusohjelma
Tieto- ja sähkötekniikan tiedekunta
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Hyväksymispäivämäärä
2010-10-06
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201010121334
https://urn.fi/URN:NBN:fi:tty-201010121334
Tiivistelmä
The Radio Frequency Identification (RFID) technology in the UHF band is a growing technology with a variety of applications in the market. The purpose of this technology is the identification of certain “object” at longer distances, cheap cost and durability. This is achieved by attaching a tag antenna to the “object”. Passive UHF tag antennas fulfil these requirements, mainly due to cheap fabrication and durability. Nevertheless, the identification distance is sensitive to the object material properties. If this “object” is a metal surface, the tag antenna radiation properties change due to reflections that propagating wave undergoes on metal surface. There is performance degradation in the tag antenna hence shorter identification range is achieved. In this thesis, some proposals to overcome the metal surface effects over tag antennas are mentioned. Moreover, a survey of different UHF patch tag antenna design is reviewed and finally the appropriate tag patch antenna is chosen for design and construction.
It is one purpose of this thesis to introduce a new design of passive UHF patch tag antenna. The main design objective of this antenna is the immunity of operating frequency and radiation properties on metal surface. The dielectric constant, thickness, and dimensions of the proposed tag antenna are based on a compromise between bandwidth and radiation efficiency. This tag antenna is simulated in electromagnetic simulators: HFSS and CEMS; then it is measured in the anechoic chamber of RFID cabinet and by the read range technique in an open environment. The simulation results between HFSS and CEMS show good agreement. This enhances the reliability of the new tag antenna design.
Some parameters of the proposed tag antenna are measured and compared with the simulation results. This tag antenna placed on metal surface of 200x200 mm2 achieves a maximum read range of 18m and realized gain of 6 dBi at 935 MHz. /Kir10
It is one purpose of this thesis to introduce a new design of passive UHF patch tag antenna. The main design objective of this antenna is the immunity of operating frequency and radiation properties on metal surface. The dielectric constant, thickness, and dimensions of the proposed tag antenna are based on a compromise between bandwidth and radiation efficiency. This tag antenna is simulated in electromagnetic simulators: HFSS and CEMS; then it is measured in the anechoic chamber of RFID cabinet and by the read range technique in an open environment. The simulation results between HFSS and CEMS show good agreement. This enhances the reliability of the new tag antenna design.
Some parameters of the proposed tag antenna are measured and compared with the simulation results. This tag antenna placed on metal surface of 200x200 mm2 achieves a maximum read range of 18m and realized gain of 6 dBi at 935 MHz. /Kir10