Table 1 S21 parameter of the combiner and the direct transmission; and the relative losses produced by the textile dual-combiner NFC-A4WP.

From: Textile dual-band NFC-A4WP (13.56–6.78 MHz) combiner for wireless energy and data transmission for connected clothing

Frequency

S21 direct (dB)

S21 combiner (dB)

Relative losses L (dB)

6.9 MHz

− 4.51

− 7.27

2.76

13.58 MHz

− 8.00

− 9.91

1.91

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