Microfluidic Flexible Substrate Integrated Microstrip Antenna Sensor for Sensing of Moisture Content in Lubricating Oil

Table 1

Microfluidic channels of different widths affect antenna resonance frequency offset.

7	Frequency (GHz)
	Air	Water	Offset	S
1.7 mm	2.264	2.104	0.160	0.0021
1.8 mm	2.264	2.089	0.175	0.0023
1.9 mm	2.258	2.074	0.184	0.0024
2.0 mm	2.283	2.071	0.212	0.0028
2.1 mm	2.274	2.047	0.227	0.0030
2.2 mm	2.295	2.069	0.226	0.0029
2.3 mm	2.286	2.040	0.246	0.0032