Abstract
A planar wideband patch antenna for ultra-high frequency (UHF) radio frequ ency identification (RFID) tag for metallic applications is presented in this research work. Three different shape patches ar e inductively coupled to a triangle loop to form wi de impedance bandwidth for uni- versal application UHF (860 – 960 MHz) RFID. The struc- ture of the proposed antenna exhibits planar profile to provide ease of fabrication for cost reduction well suited for mass production. The simulation of the antenna was carried out using Finite Elemen t Method (FEM) based software, Ansoft HFSS v13. The simulated and measured impedance bandwidth of 113 MHz and 117 MHz (Return Loss ≥ 6 dB) were achieved to cover the entire UHF RFID operating frequency band worldwide. The simulated and measured radiation patterns at the operating frequency of 915 MHz are in good agreement. Moreover the simulated maximum antenna gain at th e bore sight direction in free space and when mounted on 200 × 200 mm 2 metal plate are -5.5 dBi and -9 dBi res pectively which is enough to provide reasonable read range over the entire UHF RFID system operating band.
Highlights
Radio Frequency Identification (RFID) technology is gaining traction in various sectors due to its numerous advantages such as it does not require line of sight, high read distance, fast date rate and large storage capacity as compared to conventional barcode technology [1]
Low frequency (LF) and high frequency (HF) systems are operated based on near-field communication having limited read range up to only 1 meter
As for ultra-high frequency (UHF) and microwave systems, the interaction between tag and reader is accomplished via propagating electromagnetic wave able to provide longer read range
Summary
Radio Frequency Identification (RFID) technology is gaining traction in various sectors due to its numerous advantages such as it does not require line of sight, high read distance, fast date rate and large storage capacity as compared to conventional barcode technology [1]. As for ultra-high frequency (UHF) and microwave systems, the interaction between tag and reader is accomplished via propagating electromagnetic wave able to provide longer read range. One of the many attempts to mitigate the problem is to separate the antenna and the metal surface by using a foam spacer to create constructive interference between the incoming and reflected signal It results in thicker antenna structure which is unsuitable for RFID applications. The required impedance bandwidth should be able to cover the whole frequency range of UHF RFID band (860–960 MHz) [14]. This letter proposes a planar wideband microstrip patch RFID tag antenna design for metallic applications.
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