The design of ultra-high frequency (UHF) radio frequency identification (RFID) reader antenna
This paper presents the design of ultra-high frequency (UHF) radio frequency identification (RFID) reader antenna using low dielectric constant of microwave substrate. An RFID reader antenna emits electromagnetic signals to the microchip in the tag, and the microchip will be energized by modulatin...
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Main Authors: | , , , , , |
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Format: | Conference or Workshop Item |
Language: | English English |
Published: |
2018
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Subjects: | |
Online Access: | http://eprints.unisza.edu.my/1735/1/FH03-FRIT-18-12986.jpg http://eprints.unisza.edu.my/1735/2/FH03-FRIT-19-23943.pdf http://eprints.unisza.edu.my/1735/ |
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Summary: | This paper presents the design of ultra-high frequency (UHF) radio frequency identification (RFID) reader antenna
using low dielectric constant of microwave substrate. An RFID reader antenna emits electromagnetic signals to the
microchip in the tag, and the microchip will be energized by modulating the wave and returns to the reader antenna.
The process of wave emitting is known as backscattering due to the presence of tag been detected by the reader. High dielectric constant substrate, for example flame-retardant-4 (FR4) which is commonly used for microstrip patch
antenna, is high in dielectric constant and dielectric loss. Thus, this will lead to low gain and directivity properties of
the antenna. To overcome this matter, low-dielectric constant substrate which is Taconic TLY-5 was proposed to be
utilized for microstrip patch antenna design. The TLY-5 microstrip substrate thickness used is 1.6 mm, dielectric
constant of 2.2, and loss tangent of 0.019. A high-conductivity metal which is typically a conductive copper is been
used for the two layers of dielectric substrate, the top radiating patch layer and bottom ground layer where the copper
thickness is 0.035 mm. Microstrip feed line is used for this UHF RFID reader antenna. The width of the feed line was
tuned to obtain impedance matching of 50 Omega. The proposed antenna which is fork-shaped patch antenna was
simulated using Computer Simulation Technology (CST) and Microwave Studio software at resonant frequency of 910
MHz with the outcome results of 7.985 dB gain and -11.11 dB return loss. Nevertheless, the typical value obtained for
VSWR is less than 2. |
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