Passive RFID Uplink and Downlink Link Budget and Comparison of ASK and BPSK Backscatter Modulations

Year 2019, , 66 - 75, 01.02.2019

Kazım Evecan

https://doi.org/10.16984/saufenbilder.434517

Abstract

Complete link budget for forward and backward
link in a RFID system are given with constituent parts. Backward link signal
levels with current improvements requires separate TX and RX antenna bistatic
configuration to overcome reader threshold. To further elaborate on link
budgets, reflection coefficient and power equations are obtained from a RFID
front-end model with circuit theory and shown on a passive RFID system. It is
demonstrated that both forward and backward links have limitations on the range
depending upon tag power dissipation, antennas in use and type of modulation.
To make two distances equal, parameters are found from two way link equations.
Then, ASK and BPSK modulations are compared on communication distance for given
average backscatter difference power, minimum SNR to targeted BER on the reader
by the equations obtained on the circuit model and MATLAB simulations.

Keywords

RFID, RFID link budget, reflection coefficient, transmitted power, reflected power, ASK and BPSK backscatter modulation, BER

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