B: How should one select the amplitude distribution at a point in order to provide the optimal characteristics for such a system? Antenna Theory Assume that the transmitting antenna can be considered as a circular aperture with a continuous field distribution (the size of the radiation module is much smaller than the antenna diameter). Assume also that the amplitude and phase distributions depend on the radial coordinate in the transmitting aperture plane only. The power density distribution at the rectenna plane in the case of uniform polarization of the field has the form (see fig.2) [5,6]: The function F(u), accurate up to the constant multiplier, coincides with the radiation pattern of the transmitting antenna and is expressed by: As has been mentioned above, one can divide the phase distribution into two parts, which can be controlled separately:
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