Abstract
A semi-circle looped vertically omnidirectional radiation (VOR) patterned tag antenna for UHF (919–923 MHz for Malaysia) frequency is designed to overcome the impedance mismatch issue in this paper. Two impedance matching feeding strips are used in the antenna structure to tune the input impedance of the antenna. Two dipole shaped meandered lines are used to achieve a VOR pattern. The proposed antenna is designed for 23-j224 Ω chip impedance. The antenna is suitable for ‘place and tag’ application. A small size of 77.68×35.5 mm2 is achieved for a read range performance of 8.3 meters using Malaysia regulated maximum power transfer of 2.0 W effective radiated power (ERP).
Highlights
Radio Frequency identification (RFID) system is an automated identification technology that enables the recognition of an RFID enabled target with additional data such as temperature, date of manufacture etc
Ultra-high frequency (UHF) RFID chip consist of complex impedance that is capacitive in nature
The antenna is measured in an Agilent N5227A power network analyzer (PNA) using balun of λ/4 length
Summary
Radio Frequency identification (RFID) system is an automated identification technology that enables the recognition of an RFID enabled target with additional data such as temperature, date of manufacture etc. A semi-circle looped vertically omnidirectional radiation (VOR) patterned tag antenna for UHF (919–923 MHz for Malaysia) frequency is designed to overcome the impedance mismatch issue in this paper. To achieve conjugate matching impedance with the chip, inductive reactance must be introduced to the tag antenna feeding.
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