A NEW SPIRAL ANTENNA FOR PASSIVE UHF RFID TAG ON DIFFERENT SUBSTRATES

Juvenal Alarcon (1) , Thibaut Deleruyelle (1) , Philippe Pannier (1) , Matthieu Egels (1)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

This work presents the design of an antenna for UHF RFID tags for supply and retail market working on different substrates. This antenna is based on the principle of broadband and frequency independent antenna like spiral antenna, which in free space simulation has a reflection coefficient less than-7.5 dB over US UHF RFID frequency band. Material's effects on impedance matching and reading range of the proposed antenna have been investigated in simulation and experimentally. All simulations were performed using a simulator based on a finite element method like Ansoft HFSS. Prototypes were measured into an anechoic chamber. I. INTRODUCTION RFID in (860-960MHz) UHF frequency band is growing thanks to automatic identification. It renders a more effective tracking and supply chain management. Some advantages of RFID systems are: read range, non line of sight, multiple data read/write, memory size and data storage [1]. Today, in order to design UHF antennas for supply chain market, it's very important to have three key points in mind. The first one is production cost reduction. The goal is to achieve the lowest price for the RFID label. The second one concerns the effects of substrate materials on which the tag is attached. In this case the parameters of antenna, such as input impedance, radiation pattern, radiation efficiency, and operating frequency can change. As a consequence a reduction of reading range occurs. Finally, the utilization of same tag in different countries must be considered. Then the antenna will be broadband. This allows the simplest traceability with only one passive UHF RFID tag for products that follows in a supply chain the UHF RFID regulations in various countries. This paper presents the design of a new antenna for passive UHF RFID tags that works over different substrates. This antenna was matched using an inductive coupling at center of UHF RFID frequency band 860-960MHz.

Domaines: Electromagnétisme; Electronique

Juvenal Alarcon, Thibaut Deleruyelle, Philippe Pannier, Matthieu Egels. A NEW SPIRAL ANTENNA FOR PASSIVE UHF RFID TAG ON DIFFERENT SUBSTRATES. UECAP 2010, Apr 2010, barcelone, Spain. ⟨hal-02485675⟩