The following values of parameters were used: The results are given in Fig. 7 (uniform polarization) and Fig. 8 (radial polarization). The difference between the optimal phase distribution and the quadratic one focusing the beam at the center of the receiving antenna was found to be negligible. The results obtained indicate that an SPS with a radially polarized field at the antennas allows electricity cost to be reduced to a greater extent than an SPS with a uniformly polarized field. Summary It was shown that an SPS with a radially polarized field at the antennas has a number of advantages over an SPS with a uniformly polarized field: - more power can be transmitted and received at reduced electricity cost ($0,037 per kWh instead $0,044 per kWh for uniform polarization); - levels of antenna array diffraction sidelobes are reduced due to special arrangement of the antenna array radiation modules; - the azimuth angle orientation system can be eliminated due to the axial symmetry of the field distributions; - beam pointing towards the receiving antenna is improved due to using the sharp minimum at the beam center. The microwave power transmission system with a radially polarized field at the antennas could also be preferable for power transmission between space vehicles, etc. REFERENCES [1] GOUBAU, G., Schwering, F. (1961) "On the guided propagation of electromagnetic wave beam," IRE Trans., AP-9, May, pp. 248-256. [2] Borgiotfy, G.U., (1966) "Maximum power transfer between two planar apertures in the Fresnel zone," IEEE Trans., AP-14, March, pp. 158-163. [3] Satellite Power System: Concept Development and Evaluation Program, Reference system report, DOE/ER - 0023, October, 1978. [4] Kerwin E.M., Jezewski D.J., Arndt G.D., (1982) "Antenna optimization of single
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