Abstract
Octafilar helical antenna (OFHA) is proposed for handheld ultra-high-frequency (UHF) radio frequency identification (RFID) reader. The investigated antenna configuration consists of OFHA placed on reader device in the presence of human hand model. The antenna is designed at UHF band centered at 915 MHz. The antenna return loss, axial ratio, gain, co-polarized and cross-polarized field components are calculated using the finite element method (FEM) and compared with that calculated by finite integration technique (FIT) for verification of the simulated results. A comparison between the performance of the quadrifilar helical antenna (QFHA) and the octafiliar helical antenna (OFHA) designed at 915 MHz in the presence of the reader device and human hand model is investigated. The OFHA introduces high gain, high front to back ratio, good axial ratio and omnidirectional coverage.
Highlights
In recent years, radio frequency identification (RFID) in the UHF band (860‐960 MHz) has become popular in many applications
The RFID system generally consists of the reader, tag, and the system operates in the UHF band
This paper proposes and studies the parameters of an Octafilar helical antenna (OFHA) for handheld UHF RFID reader
Summary
Radio frequency identification (RFID) in the UHF band (860‐960 MHz) has become popular in many applications. For the QFHA the bandwidth of the antenna is related to the size (in wavelengths) of the cylindrical envelope containing the radiating elements, with the volume and diameter being important parameters The advantages of this antenna are its cardioids pattern, circular polarization and relatively small size compared to other antennas. In UHF RFID, small low gain helical antennas have been primarily used in their normal mode for readers [10]. The printed OFHA offers advantages of light weight, low cost, circularly polarized, good axial ratio and omnidirectional radiation pattern. It doesn’t need a ground plane, and the environment in the area underneath the OFHA has a relatively small effect on the radiation characteristics.
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