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. 2019 Jan 25;19(3):498. doi: 10.3390/s19030498

Figure 13.

Figure 13

Figure 13

Measured sensitivity comparison of the four permittivity sensors: (a) frequency shift (Δfr (GHz)); (b) percent relative frequency shift (Δfr/fr (%)); (c) sensitivity (Δfr/Δεr (GHz)); (d) sensitivity enhancement compared to the DR-CSRR-based sensor.