Fig. 1. Equivalent circuit of a rectenna. Fig. 2. Current and voltage wave forms, (a) Antenna currents la. (b) Load currents 1L. (c) Diode currents Id. (d) Diode voltages Vd. circuit Fig. 1 consist of nonlinear differential equations. We solve them by using Newton-Raphson iteration method (4), so that we obtain voltages and currents at each point of the circuit. The wave forms of these voltages and currents are shown in Fig. 2. Figure 2(a) shows the antenna currents; they look very much like perfect sine waves, but they contain 2nd harmonics of about -50 dB and 3rd harmonics of about -70 dB. Figure 2(b) shows the load currents; they are just direct currents. Figure 2(c) shows the diode currents; their waveforms are very complex, indicating that high amounts of higher harmonics are generated. Figure 2(d) illustrates the diode
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