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Antenna feed assembly

A feeding device and antenna technology, which can be applied in directions such as antennas, antenna supports/mounting devices, and antenna parts, etc., can solve the problems of high cost, difficulty in cooling the feeding device, and problems.

Active Publication Date: 2011-02-16
ASTRIUM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However these materials are expensive to use and heavy in the case of Invar, which has a specific gravity of 8.0
CFRP can be fabricated to form structures with a very high strength / stiffness-to-mass ratio, but CFRP has poor thermal conductivity, which makes cooling of the feeding device more difficult
Furthermore, it may be problematic for this material to manufacture with bolted or other mechanical interfaces

Method used

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  • Antenna feed assembly
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Examples

Experimental program
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Embodiment Construction

[0037] With reference to the accompanying drawings, figure 1 The arrangement shown includes a feeding device 15 . figure 1 Adjacent feed chains 1 , 2 are shown, each defining a longitudinal feed axis 3 , 4 mounted in a first mounting panel 5 and a second mounting panel 6 . The feed chains each have a feed horn 7, 8 and an end 9, 10 of the feed chain closest to the antenna reflector (not shown). Each feed horn 7, 8 defines a rim 11, 12 facing the reflector. Each rim 11, 12 defines a feed aperture 13 therein (see Figure 7 ) Each rim 11 , 12 also defines a phase center 14 . Depending on whether the antenna is used for transmission or reception at any time, the feed horns 7, 8 can be used as transmit or receive elements of the device 15, and the lateral positioning of the feed aperture 13 or phase center 14 can be considered important for the design of the device. From figure 1 It can be seen that the axial distance of the feed aperture 13 from the first mounting panel 5 is ...

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Abstract

An antenna feed assembly (15) is provided which includes at least two elongate feed chains (1, 2) lying adjacent one another. Each feed chain is adapted to transmit or receive electromagnetic radiation between itself and the antenna (34) along a longitudinal feed axis (3, 4) thereof via a transmit / receive element (7). The feed chains (1, 2) are held in fixed lateral relationship to one another byfirst and second mountings (5, 6) spaced apart axially of the feed chains. The transmit / receive elements (7, 8) extend axially from the first mounting (5) towards the antenna and the second mounting (6) is positioned on a side of the first mounting (5) remote from the antenna. The first mounting (5) has a lower coefficient of thermal expansion in the lateral direction than the second mounting (6)whereby translational movement of each transmit / receive element (7, 8) in the lateral direction owing to temperature change of the assembly (15) will be reduced.

Description

technical field [0001] The present invention relates to antenna feed arrangements, in particular but not exclusively antenna feed arrangements for satellite communications, and in particular to beam pointing errors of antennas due to temperature fluctuations in the feed arrangement. Background technique [0002] For communication antennas on satellites, it has long been difficult to avoid beam pointing errors of antennas caused by temperature fluctuations of satellites. These temperature fluctuations are mainly caused by the satellite entering or moving out of the solar radiation range. A specific example of this phenomenon is temperature fluctuations in geosynchronous satellites. These geosynchronous satellites orbit the Earth, moving in and out of the sun's radiation range as they go. Such temperature changes are typically on the order of a few hundred degrees Celsius and affect the entire satellite except for external appendages on the satellite. [0003] The communica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/00F16L3/237H01Q25/00H01Q19/17H01Q1/12H01Q1/28
CPCH01Q1/1207H01Q19/17H01Q1/002H01Q25/007H01Q1/288
Inventor 蒂莫西·约翰·艾克莱斯顿
Owner ASTRIUM GMBH