Enhanced Loop Structure of NFC Antenna for Mobile Handset Applications

Table 2

Measured results in the card mode and in the R/W mode tests.

	Card mode				R/W mode
	Load modulation Level [mVpp]				Detection range [cm]
	Min. spec. at (𝑟, 𝜙, 𝑧)
	8.8	7.2	4.0	2.4
	(0, 0, 0)	(0, 0, 1)	(0, 0, 2)	(0, 0, 3)
Conventional 5-turn loop only	27	12	4.4	1.6	46
4-turn loop with a parasitic loop	50	25	11	4.3	56