Abstract
Novel designs for high frequency radio frequency identification cards comprise an intermediate circuit between the main coil and chip, such that the chip is not physically connected to the coil on card which reduces costs of production, enhances the card’s robustness against mechanical stress and improves communication capabilities. Based on the Bode–Fano limit, we carry out a theoretical analysis on the bandwidth capabilities of such types of cards and their derivatives. We verify these results through simulations and measurements of our own design, denoted as booster-based cards. An optimization method for the design parameters of the booster-based cards is presented and derived. Measurements on three booster-based card prototypes are carried out showing the various bandwidth and power capabilities of the cards. Additionally, a comparison between the performance of such type of cards with respect to the conventional ones is presented. Card measurements included a chip, highlighting various states of the chip and its non-linearity.
Highlights
T HE HF (High Frequency) RFID (Radio frequency identification) system has witnessed a significant growth in the market in the recent years
In order to achieve practical results for the operation of our booster-based cards in an actual RFID system, we include the reader into our setup
The card under test is placed on the test Proximity Coupling Device (PCD) assembly and an active probe is used to measure the voltage transferred from the reader to the terminals of the chip or lumped load
Summary
T HE HF (High Frequency) RFID (Radio frequency identification) system has witnessed a significant growth in the market in the recent years. This is widely used in access cards for hotels, anti-theft techniques for shops, passport identification, contactless banking, transportation, disposable tickets...etc. The HF RFID cards have been a focus of the research for the recent years in order to enhance their communication performance, reduce costs of manufacturing and provide better bandwidth, among other goals. An HF RFID system operates at 13.56 MHz where it is composed of a reader (interrogator) which is power supplied and contains a coil in addition to a matching circuit to maximize its performance at the frequency of operation and provide different variants for possible data rates.
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