Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.766s&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Mathematics
Logic
Scientific paper
The limited density of an energy flow (DFE) in the Wireless Power Transmission (WPT) systems of the Space Power Stations (SPS) creates a set of difficulties including the huge antenna sizes especially of the receiving antenna. It is not only to reach the Fresnel area. It is in order to transmit the enormous power needed for Earth feeding. These circumstances require sometimes dividing the whole antenna square by separate parts. It is a feature of the WPT of the SPS to which this paper is devoted. Methods and algorithms for finding optimum phase and amplitude distributions in the WPT radiating antenna systems are developed. Here numerical methods of the phase synthesis of antennas for a field in the Fresnel area are elaborated and the example of the synthesis field is shown. In the WPT systems the practical interest represents not a peak - phase field distribution in the area of the observer but in the relation of an energy flow, which is taking place through a reception platform, to all energy radiating by transmitted antenna. There is an opportunity of improving WPT systems not only by change of the distribution of a field on the radiating aperture, but also in its form. This form can be discontinuous (discrete antenna). One of the main difficulty for the power WPT stations is the limited density of an energy flow (DFE). This circumstance requires huge sizes of antennas. This paper is devoted to the problem of decrease of radiating antenna sizes. To increase concentration of a field on the reception antenna, phase distribution on the radiating antenna is usually spherical, which has the center in a point of crossing of a reception plane and axis of radiation, and peak - falling to edges. Such distribution allows to increase factor of WPT effectiveness and to reduce a field outside of the reception antennas. However, the continuous field, falling to edges results in poor use of a radiating antenna surface. The solution of this contradiction is possible, if filling of the antenna is not complete. Let's better make field distribution on the radiating antenna falling down to edges not at the expense of creation of non-uniform distribution but of a field on the aperture. Let's create it by irregular accommodation of the sub apertures. Each of them has a distribution of a field, uniform and equal on amplitude. It is supposed, that the quantity of these sub apertures is rather great to admit approximation of optimum distribution of a field, which is close to a Gauss curve by the form, by means of step function. The locations of the sub apertures can be found by differentiation of this step function. With the help of the special program a number of practically important problems of the phase synthesis of WPT systems was solved. There were the problems of creation of a uniform field distribution on a surface of the receiving aperture and the problems of the synthesis of a field radiation having a lower radiation level in some angular sectors or some angular directions. It is important that the construction of WPT systems meets the ecological requirements.
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