A low cost circularly polarized microstrip patch antenna with low axial ratio for UHF RFID applications
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IAMOT
Abstract
This paper presents a low cost circularly
polarized microstrip patch antenna with low axial
ratio (AR) and broad AR beam width for ultrahigh frequency (UHF) radio-frequency
identification (RFID) applications. The proposed
design utilizes the corner truncated technology
along with a thicker substrate and large ground
plane to achieve circular polarization and a low
axial ratio. The substrate material for the antenna
is FR-4, which has a dielectric constant of ๐. ๐. The
antenna is fed by using a ๐๐ โ๐๐๐ feed line.
Simulations are carried out using the CST
(Computer Simulation Technology) Studio Suite
software. The simulation results show that the
proposed antenna has a reflection coefficient of less
than โ๐๐ ๐
๐ฉ from ๐๐๐. ๐๐ ๐ด๐ฏ๐ to ๐๐๐. ๐๐ ๐ด๐ฏ๐
with a bandwidth of ๐๐. ๐๐ ๐ด๐ฏ๐. The antenna
provides the axial ratio less than ๐ ๐
๐ฉ for the
frequency range from ๐๐๐ ๐ด๐ฏ๐ to ๐๐๐ ๐ด๐ฏ๐.
Other antenna parameters, such as the directivity,
gain, voltage standing wave ratio (VSWR) etc. are
also presented and discussed. The antenna with
optimized dimensions is fabricated and measured.
The measured results show good agreement with
simulated results. The fabricated antenna has a
bandwidth of ๐๐. ๐๐๐ ๐ด๐ฏ๐ and achieves a
minimum reflection coefficient of โ๐๐. ๐๐ ๐
๐ฉ at
๐๐๐. ๐๐๐ ๐ด๐ฏ๐
Description
Citation
Naidoo, S.J. et al. 2020. A low cost circularly polarized microstrip patch antenna with low axial ratio for UHF RFID applications. International journal of microwave and optical technology (IJMOT), 15(3):211-219. [https://www.ijmot.com/VOL-15-NO-3.aspx]