H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
325/10, 351/53
H01Q 3/26 (2006.01) H01Q 3/00 (2006.01) H01Q 19/12 (2006.01) H01Q 21/08 (2006.01) H04B 7/14 (2006.01)
Patent
CA 1093207
ABSTRACT OF THE DISCLOSURE For a satellite communications transmission system, the ground stations of which use relatively small antennae of low directivity, an antenna is suggested the radiation polar diagram of which has in a first plane a 3 dB beam-width of between 0.2° and 2° and in a second plane perpendicular to the first plane a 3 dB beam-width of between 2° and 20°. The ration of 3 dB beam- widths in the first and second planes is less than or equal to 0.25. The first plane is substantially that which is defined by the antenna main beam axis and by a tangent to the geostationary orbit of the satellite at its intersection with this axis. To avoid mutual interference between various satellite systems the beam-width has to be restricted only in the first plane which is at least approximately identical to the first sectional plane of the radiation polar diagram of the antenna.
283035
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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