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In the basic RFID system (as shown in Figure 1):
1. The Reader generates an electromagnetic field. This field is rectified to generate the supply voltage inside the Tag.
2. The Reader transmits information to the Tag by modulating the carrier wave.
3. The Tag back-scatters the carrier wave, by modifying its own impedance thereby perturbing the field, in order to transmit back information to the Reader.
The aim of this application note is to present a 90 × 10 mm reference antenna design for the XRAG2 UHF RFID memory chip. This document presents the antenna dimensions and tuning variables. It also explains the
antenna development methodology, based on XRAG2 conjugate impedance matching and
measurements of frequency detuning caused by antenna materials and assembly parasitic
capacitance.
The ST30F77xi devices are new derivatives of the STMicroelectronics ST30 family of 32-bit
single-chip CMOS microcontrollers.
This application note lists the differences between the ST30F774 and ST30F77xi devices
and is intended for hardware or software designers who are adapting an existing application
based on the ST30F774 to the ST30F77xi.
In the basic RFID system (as shown in Figure 1):
1. The Reader generates an electromagnetic field. This field is rectified to generate the supply voltage inside the Tag.
2. The Reader transmits information to the Tag by modulating the carrier wave.
3. The Tag back-scatters the carrier wave, by modifying its own impedance thereby perturbing the field, in order to transmit back information to the Reader.
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