Table 4 Performance assessment between the presented sensor and existing sensor.
From: Quad-band split ring resonator-based sensor for microwave sensing application
Refs. | Electrical size (mm2) | Figure of merit (FoM) | Operating band (GHz) | Sensitivity | Application | Quality factor |
|---|---|---|---|---|---|---|
\(\:0.28\lambda\:\times\:\:0.14\lambda\:\) | 6.33 | S-band | 20–100 mg/mL | Microwave filter | 160 | |
\(\:0.25\lambda\:\times\:0.3\lambda\:\) | NR | S-band | 490 MHz/step | Liquid sensor | 220 | |
\(\:0.098\lambda\:\times\:0.094\lambda\:\) | 7.3 | C-band | − 3dB/mm | Thickness sensor | 120 | |
\(\:0.32\lambda\:\times\:0.32\lambda\:\) | 11.05RIU− 1 | S-band | 0.3537 GHz/RIU | Permittivity sensor | 110 | |
\(\:0.68\lambda\:\times\:\:0.29\lambda\:\) | 2 | C-band | 0.03 | Liquid sensor | 75 | |
\(\:0.59\lambda\:\times\:\:1.92\lambda\:\) | 1 | S-band | 0.1 | Material sensor | 35 | |
\(\:0.12\lambda\:\times\:\:0.06\lambda\:\) | 1 | L-band | 0.13 | Liquid sensor | 60 | |
\(\:0.28\lambda\:\times\:\:0.28\lambda\:\) | 12 | S-band | 0.46 | Liquid sensor | 44 | |
\(\:0.26\lambda\:\times\:\:0.26\lambda\:\) | 1.7 | C-band | 0.04 | Material sensor | 46 | |
\(\:0.29\lambda\:\times\:0.35\lambda\:\) | 22 | C-band | 0.28% | Liquid sample | 280 | |
\(\:0.5\lambda\:\times\:0.5\lambda\:\) | NR | S-band | 0.53 for sample volume 1330 \(\:\mu\:\)L | Moisture content | 240 | |
\(\:0.09\lambda\:\times\:0.07\lambda\:\) | NR | S-band | 0.28 for the liquid volume of 4.5 \(\:\mu\:\)L | Liquid mixture | 2700 | |
Proposed | \(\:0.07\lambda\:\times\:0.07\lambda\:\) | 6.15 | C-band | 12.03% change for permittivity value 0.092 change | Material sensor | 325 |
Ku-band | 11.53% change for 0.5 mm MUT thickness change | Thickness sensor |
