A novel testing system for RFID tags in proximity to electrolyte solution

Nearby electrolyte solution may have a negative effect on the performance of UHF RFID tags. In this paper, we designed a dynamic testing system and conducted a series of experiments, investigating how they affect the read range of RFID tags. The main reason for the decrease of read range is that the boundary conditions near the solution surface reduce antenna gain and transmission coefficient. With the conductivity of the electrolyte solution increasing or the distance between a tag and electrolyte solution reducing, the read range of the RFID system decreases. Moreover, the simulation of maximum read range was carried out with our proposed theoretical formula. The theoretical results were found to be in good agreement with experimental data.