power transmission system configuration: maximum distance between the antennas - 25 km; wavelength - 12.25 cm; rectenna radius - 60 m; peak power density at the antenna - 1 kW/m2. The value of the parameter rowas 1.7, so the antenna radius was 27.6 m. Conclusion In the case of variable distance between the antennas (microwave power transmission between space vehicles, or from a low orbit SPS to the Earth) it is preferable to use an adaptive transmission system, to prevent power output fluctuations by phase distribution tuning. It was shown that the tapers with the maximum value of collection efficiency, and uniform tapers, are not a good choice for such a system - it is not possible to change the distance between antennas in this case. A synthesis method has been proposed which generates the optimal antenna illumination tapers. The tapers developed allow the range of allowable distance changes to be maximized (for example, it is possible to change the distance by 2.5 times for t0=1.7 and collection efficiency r)= 0.8) or power output to be maximized while range is fixed.
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