Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1995-12-27
1997-12-30
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343765, 343882, H01Q 314, H01Q 1906
Patent
active
057036039
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the field of antenna engineering, specifically, to a multi-beam lens antenna.
BACKGROUND ART
A known multi-beam lens antenna (RST/SU 91/00145) consists of a centro-symmetric spherical lens, secured to the foundation with the aid of a frame, and capable of changing the angle between the plane of the frame and the horizontal plane, and a semi-circle guide with attachment subassemblies and adjustment of illuminator position. This antenna provides for simultaneous reception of signals emitted by various sources, such as satellites.
The design of this lens ensures a practically unchanging value for the gain directed toward all signal sources (satellites), positioned at various points on the geostationary orbit. The known multi-beam lens antenna may easily be directed toward any position of the geostationary satellites. In addition to this, it provides for attachment of the spherical centro-symmetric lens to the frame with the aid of two identical rods, each of which is attached at one end to the frame at the point lying on its shorter axis of symmetry, with the same incline toward the plane of the frame, and meeting each other in the plane perpendicular to the plane of the frame. Upon installation of the spherical lens with frame, assembly tensions develop in the design, caused by the imprecision in production of the connecting surfaces, which leads to a decrease in the dependability of the antenna.
Upon loading and unloading, transportation and hoisting of the antenna to the building or other structures, the inertial forces which act on the spherical lens lead to deformation of the frame and the appearance of additional tensions in the frame construction and the spherical lens, which also decreases the reliability of the antenna, since the margin of stability of the spherical lens cannot be great, as it is made of materials which possess a high level of radio engineering characteristics and a comparatively low level of stability. The method used for strengthening the spherical lens demands precise mechanical engineering of the connecting surface and the control assembly, which increases the antenna's production cost.
In the known antenna the frame is fastened to the base by its lower section, and the center of the spherical lens is located high above the supporting surface of the base, which leads to the development of a significant moment of overturn under the force of winds and makes necessary fastening the antenna to the roof of the building or structure, which increases the cost of the assembly work. In addition to this, the means adopted for fastening the frame to the base leads under conditions of transportation to the appearance of additional tensions in the design, since the mass center of the spherical lens stands off from the incline axis of the frame by an amount equal to the smaller semiaxis of the frame, which results in a decrease in the antenna's reliability. Insofar as at the same time the spherical lens statically is not balanced relative to the base, at the stage of assembly particular accuracy directed toward the spherical lens is necessary, which requires the use of qualified personnel and also carries an increase in the cost of the set-up and adjustment operations. In the known antenna the semi-circle guide is rigidly attached to the frame. This type of attachment demands precise manufacture of the connecting surfaces and makes adjustment of the position of the semi-circle guide into its plane impossible. Such adjustment is necessary to compensate for the technical scattering/dissipation of the focal distance of the spherical lens, and increases the production cost of the antenna. In addition to this, the plane of the semi-circle guide passes across the center of the spherical lens and is perpendicular to the axis of the spherical lens, passing through its polar points. At the same time the semi-circle guide does not permit the installation of illuminators in the optimal position, at which their axes lie in the plane perpendicular to the
REFERENCES:
patent: 3230536 (1966-01-01), Cheston
patent: 3404405 (1968-10-01), Young
patent: 4656486 (1987-04-01), Turner
Epshtein Alexandr Lvovich
Korzhenkov Petr Nikolaevich
Pyait Jury Leonidovich
Smagin Alexandr Semenovich
Tovarischestvo S Ogranichennoi Otvetstvennostju "Konkur"
Wimer Michael C.
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