Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Reexamination Certificate
1999-12-13
2001-02-20
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
C343S709000
Reexamination Certificate
active
06191749
ABSTRACT:
FIELD OF INVENTION
The present invention relates to an arrangement comprising an antenna reflector and a transceiver horn combined to form a compact antenna unit. More particularly, the invention relates to an antenna arrangement that can be mounted on a movable support surface (land mobile or marine equipment) and intended particularly for two-way satellite communication equipment.
BACKGROUND OF THE INVENTION
There is often used with earlier known antenna arrangements of this kind a so-called pivot suspension in combination with advanced mechanical constructions that imply large inertia. These solutions require the application of significant forces in order to manage or handle necessary acceleration forces and result relatively often in mechanical breakdowns in the equipment.
Because of the externally acting dynamic forces to which such equipment is subjected when moving in high seas, the equipment must be mechanically strong. At the same time, there must be no play which enables the equipment to move when subjected to dynamic forces, and movement of the support relative to a predetermined geostationary satellite or an inclining satellite or other low-flying non-geostationary satellites relative to a terrestrial observer must be fully compensated for.
SUMMARY OF THE INVENTION
According to the present invention an antenna arrangement of the aforedescribed kind includes a dynamic vibration-dampened suspension device, a first rotation frame rotatably mounted on the periphery of the suspension device, a first elevation frame pivotally mounted in the first rotation frame, a second elevation frame pivotally mounted in the first elevation frame, and a second rotation frame pivotally mounted in the second elevation frame. The suspension device includes an outer part by means of which it can be mounted firmly to an underlying support, and an inner part which is fastened to said outer part through the medium of said dynamic vibration-damping means and which constitutes a support for the pivotally mounted first rotation frame. The second rotation frame is pivotally mounted on the second elevation frame and provides an attachment for the compact antenna unit.
According to this embodiment, the requisite pivot points are moved out to the perimeter of the suspension device, thereby providing space for accommodating the compact antenna unit in the centre of said device. The power unit for moving the antenna is therewith positioned at a maximum distance from the centre of rotation, whereby mechanical “play” out in the periphery of said device will be negligible, as calculated in angular measurements at the centre of the suspension device.
These and other features of the present invention will be apparent from the following claims.
REFERENCES:
patent: 2604698 (1952-07-01), Ewing
patent: 5359337 (1994-10-01), Eguchi
patent: 2 589 633 (1987-05-01), None
Jacobson Price Holman & Stern PLLC
Trulstech Innovation KB
Wimer Michael C.
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