Times Semi-Passive RFID Tags with Double Loop Antennas Arranged as a Shifted Gate Stability Optimization

Ofer Aluf

doi:10.11114/set.v1i1.320

Abstract

In this article, Very Crucial subject discussed in Semi-Passive RFID TAGs system stability. Semi-Passive TAGs with double loop antennas arranged as a shifted gate system stability optimization under delayed electromagnetic interferences. The double loop antenna is employed due to the fact that this antenna consists of two parallel loops; i.e., primary and secondary loops. We define Vi1(t) and Vi2(t) as the voltages in time on double loop antennas. Vi1(t) is the voltage in time on the primary loop and Vi2(t) is the voltage in time on the secondary loop. The index (i) stand for the first gate (i=1) and second gate (i=2). Due to electromagnetic interferences there are different in time delays respect to gate antenna's first and second loop voltages and voltages derivatives. The delayed voltages are Vi1(t-τ1) and Vi2(t-τ2) respectively (τ1≠ τ2) and delayed voltages derivatives are dVi1(t-Δ1)/dt, dVi2(t-Δ2)/dt respectively.

Highlights

In this article, Very Critical and useful subject is discussed: Semi-Passive RFID TAGs system stability.A semi-passive tags operate to passive RFID tags
Semi-Passive TAGs with double loop antennas arranged as a shifted gate system stability optimization under delayed electromagnetic interferences
Due to electromagnetic interferences there are different in time delays respect to gate antenna's first and second loop voltages and voltages derivatives

Summary

Introduction

Very Critical and useful subject is discussed: Semi-Passive RFID TAGs system stability.A semi-passive tags operate to passive RFID tags They contain a battery that enables longer reading distance and enables the tag to operate independently of the reader.Semi-Passive TAGs with double loop antennas arranged as a shifted gate system influence by electromagnetic interferences which effect there stability behavior. The double loop antennas in series are connected in parallel to Semi-Passive RFID TAG. The Equivalent Circuit of Semi-Passive RFID TAG is Capacitor (C1) and Resistor (R1) in parallel with voltage generator Vs1(t) and parasitic resistance rS1. Vs2(t) and parasitic resistance rS2 are belong to the second gate antenna system with another Semi-Passive RFID TAG (Supakit, et al.)

K dVm dt

RFID shifted gate system stability analysis under delayed variables in time

Results

Discussion

Conclusion