Communications: radio wave antennas – Antennas – Wave guide type
Patent
1997-01-27
1999-02-23
Wong, Don
Communications: radio wave antennas
Antennas
Wave guide type
343776, 333135, H01Q 1300
Patent
active
058749233
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a feeder horn intended particularly for two-way satellite telecommunication equipment, and more particularly to such a horn that includes a central transmitter/receiver horn and at least three separate measuring horns which are positioned symmetrically relative to the symmetry line of the feeder horn.
DESCRIPTION OF THE BACKGROUND ART
The mechanical and electrical components of satellite communications equipment intended particularly for marine applications must be of a very high quality that will guarantee a smooth and continuous operating time of at least about two years before the event of a malfunction. It can be mentioned as an example that the mechanical gyros available do not provide information on very small changes occurring in the three-dimensional space. The mechanism of such gyros is encumbered with a large intrinsic inertia which makes it impossible to handle information quickly enough to compensate for the rapid but small changes to which the equipment can be subjected in marine environments.
Equipment of this kind includes control systems which receive input data from transmitters in positioning systems. This input data is updated against non-linearity and operation due to thermic influences in electronic systems among other things, by calibrating actively against a "true" signal, ie the signal that is received by an antenna and that has its origin from the target object, the satellite, concerned, whose elevation and azimuth are well-defined for those geostationary satellites that can constitute a reference for "true" calibration.
It is only possible to satisfy the required tracking accuracy of 0.1.degree., by using an efficient and highly effective tracking system which is fast enough to track continuously satellite transmitted signals and to register any deviations that might occur in the X:Y:Z-directions. Those products that are available commercially at present are associated with very high investment costs (in the order of about SEK 1,000,000:-). Furthermore, it is difficult to find technical solutions that would enable the cost to be reduced by manufacturing in large numbers.
The object of the present invention is to eliminate the aforesaid drawbacks of a technical and economic nature.
The novel and inventive feeder horn is based on the basic concept of producing a physical phase difference between incoming signals solely mechanically. The characteristic features of an inventive feeder horn are set forth in the following claims.
SUMMARY OF THE INVENTION
An inventive feeder horn of the aforesaid kind is characterized in that all horns are produced mechanically in a one-piece metal structure which includes a transceiver-horn accommodating through-penetrating centre opening which merges with a transmitter waveguide and a receiver waveguide separated by filters of the orthomode transducer kind (OMT), wherein switch means for each of the measuring horns are anchored in the metal structure, and wherein moat-like channels are provided around each opening in the metal structure, to isolate electromagnetically each horn in relation to remaining horns.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the accompanying schematic drawings, in which
FIG. 1 illustrates schematically one embodiment of an inventive feeder horn from above; and
FIG. 2 is a side view of the horn shown in FIG. 1.
DESCRIPTION OF PREFERRED EMBODIMENTS
The illustrated feeder horn includes a centrally positioned transceiver horn 10 and four separate measuring horns 11, 12, 13, 14 which are placed symmetrically in relation to the symmetry line O of the feeder horn at right angles to the plane of the drawing.
All horns are produced mechanically in one and the same metal structure 1. The transceiver horn 10 has a through-penetrating opening 100 which merges with a transmitter waveguide 101 and a receiver waveguide 102 which are separated by an orthomode transducer type filter 103 (an OMT-filter). Each of the measuring horns 11, 12
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patent: 5113197 (1992-05-01), Luh
patent: 5406298 (1995-04-01), Walterr
Nilsson Mats
Tiihonen Kari
Ho Tan
Trulstech Innovation Handelsbolag
Wong Don
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