NWU Institutional Repository

A low cost circularly polarized microstrip patch antenna with low axial ratio for UHF RFID applications

Loading...
Thumbnail Image

Date

Journal Title

Journal ISSN

Volume Title

Publisher

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Ÿ’. ๐Ÿ‘. The antenna is fed by using a ๐Ÿ“๐ŸŽ โˆ’๐’๐’‰๐’Ž 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 โˆ’๐Ÿ๐ŸŽ ๐’…๐‘ฉ from ๐Ÿ–๐Ÿ–๐Ÿ”. ๐Ÿ๐Ÿ‘ ๐‘ด๐‘ฏ๐’› to ๐Ÿ—๐Ÿ๐Ÿ’. ๐Ÿ—๐Ÿ” ๐‘ด๐‘ฏ๐’› with a bandwidth of ๐Ÿ‘๐Ÿ–. ๐Ÿ•๐Ÿ‘ ๐‘ด๐‘ฏ๐’›. The antenna provides the axial ratio less than ๐Ÿ‘ ๐’…๐‘ฉ for the frequency range from ๐Ÿ—๐Ÿ๐Ÿ“ ๐‘ด๐‘ฏ๐’› to ๐Ÿ—๐Ÿ๐Ÿ— ๐‘ด๐‘ฏ๐’›. 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 ๐Ÿ“๐Ÿ•. ๐Ÿ“๐Ÿ๐Ÿ• ๐‘ด๐‘ฏ๐’› and achieves a minimum reflection coefficient of โˆ’๐Ÿ๐Ÿ•. ๐Ÿ—๐Ÿ• ๐’…๐‘ฉ at ๐Ÿ—๐Ÿ๐Ÿ’. ๐ŸŽ๐Ÿ’๐Ÿ“ ๐‘ด๐‘ฏ๐’›

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]

Endorsement

Review

Supplemented By

Referenced By