antenna grids - into one solar active phased antenna grid (SAPAG) which consists of separate active semiconductor modules (8). This group for the first time succeeded in realization and testing of SAPAG in which principally new photoelectric generators of microwave radiation were functioning. They include non - linear semiconductors structures in which auto oscillations are aroused because of inner feed - back with negative differential conductivity. Dr. V.V.Rybakov with collaborators (Moscow Aviation Institute) proposed a new method of generation of microwave radiation with the help of a plasma ionic engine. The space power group headed by Dr. V.A.Vanke at Physics Department of Moscow State University has developed the methods of synthesis of highly effective antennae with a low sidelobe level (9). It has been proved that strict standard of radiation security adopted in the CIS (< 10 mW / cm^) can be observed and the demands can be met of electromagnetic compatibility (<0.27 mW / cm^) over the limits of the receiving antenna. One of the latest investigations of this group is the unique antenna with polarized emission which doubles the transmitted power for the fixed values of maximum energy fluxes at the inlet and the outlet of energy transmission channel. For the first time the idea of optimum density of rectenna converters on the square of a receiving antenna was analyzed at Moscow State University. It turned out that 80 to 100 units per square meter will provide the maximum effectiveness of transformation of microwave energy into direct current. A powerful high frequency cyclotron (similar to a magnetron) with DC output has been developed. It produces dozens of kilovolts at the outlet with power up to 50 kW. This greatly increases the reliability of the ground system. The results of our research prove that it is possible to realize the idea of solar space power stations, some elements of space power systems have already been developed and the realization of the SPS demonstration project is delayed only because of lack of financing. It is necessary for the governments to use a more balanced approach to the long - term power programs. Now large resources are spent to solve the problem of controlled nuclear fusion which is far from being realized even as a laboratory unit. There is one more important conclusion which can be made from the research work: the problem of SPS creation is very complicated and requires the solution of various problems such as biological, ecological and social. We are sure that Universities are to become the centers of development. Soviet Universities have come out in favor of a proposal of University cooperation on the problems of Solar Space Power Stations on a world scale. We call upon for international cooperation in the field of creation of engineering orbital complexes. We believe that generating the industrial complex on the near - Earth orbit would permit the solution of the following problems efficiently from the economic point of view: • production of biopreparations in the conditions of weightlessness;
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