Effects of Metamaterial Slabs Applied to Wireless Power Transfer at 13.56 MHz

Table 1

Comparison of WPT efficiencies when using lossless slabs.

	(cm)	,; (cm)	(cm)		()	(Ω)	Efficiency; (%)
1	—	—	—	0.0038	2.68	0.07	47.4
−1	12	6	60	0.6808	480	12	98.2
−2	8	8	80	0.1715	121	7.3	97.3
−3	6	9	100	0.0795	56	1.4	95.8

( = 13.56 MHz, = 5 cm, = 0.2 cm, = 24 cm, and = 705).