Table 3.

Measured input power P_in (dBm), input return loss S₁₁ (dB), and output DC voltage V_dc (V) with respect to distance (m) between the transmitter and test PCB, input impedance Z_in (Ω) and its corresponding matching circuits [L (nH) and C (pF)] for the RF-DC rectifier with the over-voltage protection circuit.

Distance (m)	Zin (Ω)	Matching Circuits		Pin (dBm)	S11 (dB)	Vdc (V)
		Parallel (L)	Series (C)
5.45	50.548 − j × 2.294	2.4 nH	38 pF	−20	−28.1	0.291
5.12	52.043 − j × 2.893	3.6 nH	32 pF	−17	−28.4	0.535
4.66	53.916 − j × 1.260	6.8 nH	29 pF	−14	−32.6	0.792
4.25	51.784 − j × 2.789	8.6 nH	26 pF	−11	−29.8	1.019
3.93	52.784 − j × 2.699	6.6 nH	24 pF	−8	−28.4	1.223
3.60	48.561 − j × 6.422	5.6 nH	22 pF	−5	−33.0	1.450
3.30	52.109 + j × 3.382	5.6 nH	22 pF	−4	−28.3	1.509
3.15	53.942 − j × 1.324	6.2 nH	22 pF	−3	−28.0	1.623
2.90	54.226 + j × 2.072	6.2 nH	22 pF	−2	−26.9	1.682
2.70	53.369 − j × 11.324	6.8 nH	22 pF	−1	−29.0	1.700
2.45	51.464 − j × 1.307	7.5 nH	22 pF	0	−34.3	1.702
2.25	51.581 + j × 7.158	10 nH	10 pF	1	−35.4	1.706
1.68	49.710 − j × 4.909	10 nH	10 pF	2	−26.1	1.712
1.50	53.573 + j × 1.835	12 nH	10 pF	3	−28.2	1.714
1.00	54.669 − j × 1.756	22 nH	10 pF	6	−26.4	1.716
0.68	53.350 − j × 2.136	68 nH	10 pF	9	−28.3	1.723
0.55	50.655 − j × 4.093	100 nH	10 pF	10	−27.7	1.725