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

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 V_i1(t) and V_i2(t) as the voltages in time on double loop antennas. V_i1(t) is the voltage in time on the primary loop and V_i2(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 V_i1(t-τ₁) and V_i2(t-τ₂) respectively (τ₁≠ τ₂) and delayed voltages derivatives are dV_i1(t-Δ₁)/dt, dV_i2(t-Δ₂)/dt respectively.