AN2866 datasheet(21/24 Pages) STMICROELECTRONICS

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AN2866 Datasheet(PDF) 21 Page - STMicroelectronics

Part #	AN2866

Description	RFID tags extract all of their power

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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21 / 24 page

AN2866

Non-contactless (contact) measurement method

21/24

Figure 22.

New coil samples

10. Characterization of the coil samples

As shown in Figure 23, the ideal tuning is close to Lant.

Figure 23.

Second coil characterization

11. Conclusion: the best coil prototype is the one tuned at a little more than 6.72 µH

(illustrated in Figure 24).

Figure 24.

Best antenna coil prototype

ai15827

6.72 µH (Lant)

6.85 µH (Lant +2%)

6.58 µH (Lant –2%)

13.56 MHz

6.58 µH 6.72 µH 6.85 µH

ai15826

ai15828

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