Readout Distance Enhancement of the Passive Wireless Multi-Parameter Sensing System Using a Repeater Coil

Table 1

The maximum readout distances of the sensing system under different conditions.

	Power supply VE (V)	Readout distance (cm)
Without a repeater coil	10	4.5
	9.1	4.5
With a PCB repeater coil	10	7.5
	13.9	10.5
With a copper wire repeater coil	10	9
	19.3	13.5