Table 2 Performance of the sensor for various material characterizations.

From: Quad-band split ring resonator-based sensor for microwave sensing application

MUT

Functional frequency (GHz)

\(\:{f}_{r}\) (GHz)

Notch (dB)

\(\:{f}_{r}\) shift (MHz)

Simulated

Measured

Sim.

Meas.

FR-4

3–5

3.93

3.94

− 20.52

− 18.62

210 (FR-4 and RO4350B)

RO4350B

4.14

4.14

− 29.04

− 25.24

600 (RT5880 and RO4350B)

RT5880

4.74

4.76

− 26.76

− 24.61

810 (FR-4 and RT5880)