Table 2.
Performance of the proposed sensor compared with other SIW-based ethanol sensors.
| Reference | Sensing | Frequency Shift (∆f) ǂ (MHz) | Sensitivity (MHz/εr) | Technology | QF | Volume (μL) |
|---|---|---|---|---|---|---|
| [21] | Ethanol liquid | 145 | 26.36 | SIW | 39.12 | 10 |
| [34] | Ethanol liquid | 70 | 12.73 | SIW | 51 | 1 |
| [37] | Ethanol liquid | 38 | 5.84 | SIW | 334.6 | 500,000 |
| This work | Ethanol purity | 380 | 69.07 | Circular SIW | 1080 | 3 |
ǂ Frequency shift (∆f) and sensitivity (∆f/∆εr) are calculated from air and ethanol; εr of air and ethanol are 1 and 6.5, respectively [38]. Unloaded QF are calculated when there is no ethanol sample (bare resonator).