fig4

Figure 4. Impact of environmental factors on SWSS signal transmission. (A) Schematic of the barrier material test; (B) Time-domain and frequency-domain responses measured using different barrier materials; (C) Schematic of the climate chamber with controllable temperature and humidity; (D) Time-domain and frequency-domain responses under varying humidity conditions; (E) Time-domain and frequency-domain responses under varying temperature conditions. SWSS: Self-powered wireless sensing system.