EP4425713A1 - Parabolischer reflektor mit veränderlicher form - Google Patents

Parabolischer reflektor mit veränderlicher form Download PDF

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Publication number
EP4425713A1
EP4425713A1 EP23461529.2A EP23461529A EP4425713A1 EP 4425713 A1 EP4425713 A1 EP 4425713A1 EP 23461529 A EP23461529 A EP 23461529A EP 4425713 A1 EP4425713 A1 EP 4425713A1
Authority
EP
European Patent Office
Prior art keywords
parabolic reflector
dome
pushers
bars
reference plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP23461529.2A
Other languages
English (en)
French (fr)
Inventor
Jacek Paczkowski
Kacper Ostrowski
Krzysztof Kramek
Marcin Mrugalski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uniwersytet Zielonogorski
Original Assignee
Uniwersytet Zielonogorski
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uniwersytet Zielonogorski filed Critical Uniwersytet Zielonogorski
Priority to EP23461529.2A priority Critical patent/EP4425713A1/de
Publication of EP4425713A1 publication Critical patent/EP4425713A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/147—Reflecting surfaces; Equivalent structures provided with means for controlling or monitoring the shape of the reflecting surface

Definitions

  • the subject of the invention is a parabolic reflector with variable shape.
  • Parabolic reflectors are mainly used as light sources, mirror telescopes and radio telescopes, solar collectors and parabolic antennas.
  • the disclosure of the European patent EP2702448 discloses a folding reflector with screen spokes connected using articulated joints, as a wreath, to a bearing body, which can be used to unfold the reflective screen, in which the actuating device causes a pressure plate to move along the guiding pins, wherein the actuating device has a manually operated or motor-operated lever connected with each of the guiding pins.
  • This solution does not include a flexible dome which enables the shape of the reflector to be changed and enables only the reflector to be folded and unfolded.
  • EP3480885A1 describes a parabolic antenna spread on ribs, in the shape of a spiral.
  • the Chinese patent application CN104283000A discloses an antenna concept which is flexible before unfolding and becomes rigid after unfolding.
  • the objective of this invention is to enable the modification of the "looking" direction of a parabolic antenna and to select the focus without the need to move the entire antenna or a boom with a converter.
  • the subject of the invention is a parabolic reflector with variable shape containing a dome, characterised in that:
  • the dome has preferably the form of a single sheet of flexible material (1).
  • the dome is preferably made of segments made of flexible material (1).
  • the front face of the flexible material (1) preferably reflects electromagnetic radiation.
  • the flexible material (1) is preferably an elastomer.
  • the front face of the elastomer is preferably coated with a material reflecting electromagnetic radiation, such as metal foil, paint containing metal particles, etc.
  • the bars (3) are preferably made of spring steel.
  • the flexible material (1) is preferably attached removably to the bars (3).
  • the flexible material (1) is preferably attached to the bars (3) using at least one protruding element (5) with an opening, through which the bar (3) passes, wherein the protruding element (5) is permanently attached to the flexible material (1), preferably by gluing, thermal welding or welding.
  • the pushers (2) are preferably equipped with a clutch uncoupling the pusher (2) drive.
  • Each of the pushers (2) is preferably provided with a step motor.
  • Each row of the pushers (2) is preferably provided with a step motor.
  • All pushers (2) are preferably driven by a single step motor.
  • the bars (3) preferably cross one another at a right angle and the pusher (2) simultaneously shapes the horizontal and vertical bars (2).
  • the dome can take any shape which can be achieved using the system including pushers and bars made of spring steel.
  • a shape of the parabolic dome may be achieved, the focus and direction of the symmetry axis of which can be changed within a specific range.
  • This allows the antenna to direct at various satellites without moving the satellite converter installed on a boom, but only by changing the shape of the dome.
  • the change of the dome shape enables the parabola focus to be selected, which enables several converters to be placed on the antenna and to direct the radio waves reflected from the dome onto the selected converter by changing the dome shape.
  • the dome may be divided and e.g. the left half of the dome can be directed towards one converter and the right half of the dome towards another converter.
  • the antenna it is possible to divide the antenna into areas "looking" towards various satellites.
  • the dome of the reflector according to the invention is flexible, which enables programmed change of the shape of the reflector, and thus the direction of the reflector axis and the position of the focus.
  • the box can be installed on a building wall. If this is a parabolic antenna reflector, the direction towards which the antenna looks can be changed without changing the position of the box. In particular, the antenna angle can be changed by changing the shape of the flexible dome.
  • Fig. 1 shows three positions of the dome.
  • the first (I) at an angle -15°
  • the second (II) at an angle 0°
  • the third (III) at an angle +30°.
  • the focus position remains unchanged.
  • the converter is permanently fixed in a single position.
  • the antenna box and the arm with the converter remain stationary. Only the flexible dome of the reflector moves.
  • the flexible antenna allows for more than just rotation of the antenna dome.
  • the change of the antenna shape allows the focus position to be changed ( Fig. 2 ). This means that several foci can be pre-determined and several stationary converters can be placed in their positions (e.g. for various frequencies).
  • Such an antenna may not only change its orientation direction, but also its electric parameters by selecting one of several converters.
  • the flexible dome of the reflector and several converter allow, in turn, the dome to be divided into e.g. two parts, with the first part (e.g. the left part) "looks" at a satellite at an angle of e.g. - 15°, while the other (e.g. the right part) looks at the satellite at an angle of +30°.
  • the first part projects onto a focus located e.g. 250 mm away from the neutral position of the elastomer, while the second part - onto a focus located 500 mm away. It is thus possible to simultaneously receive data from two satellites using a single antenna dome.
  • the dome is made of an elastomer (1) spread on bars (3) made of spring steel.
  • the dome is made of a different flexible material (1).
  • the bars (3) are bent by the pushers (2), achieving the required shape of a parabola.
  • the elastomer (1) is provided "in the rear" with protruding elements (5) with openings, through which the bars (3) made of spring steel pass. Thanks to this, the elastomer (1) has a shape similar to a shape modelled using steel bars.
  • the surface of the elastomer (1) may be covered with aluminium foil or paint with high content of metal or another conductor (e.g. graphite), such that it reflects radio waves.
  • aluminium foil or paint with high content of metal or another conductor (e.g. graphite), such that it reflects radio waves.
  • metal or another conductor e.g. graphite
  • the surface of the elastomer (1) must be coated with a substance providing a mirror effect after polishing.
  • the pushers (2) are provided with screws at their ends. These screws are provided with nuts (6) placed in the reference plane passing behind the dome. All nuts (6) are in the same plane. The number of nut turns (6) is translated into the distance between the end of the pusher (2) and the reference plane (4).
  • every pusher (2) may be located at a different distance from the reference plane (4), it is preferable to provide each of the pushers (2) with a clutch uncoupling the pusher (2) drive when it is not being positioned. This allows the position of individual pushers (2) to be set.
  • each of the motors drives the entire row of pushers (2), e.g. through a toothed belt and gears on the pushers.
  • clutches are used (one per pusher). The clutch allows the user to decide if the given pusher is driven at the given time by the pusher row motor. This allows a single pusher or a group of pushers to be controlled.
  • a classical gearbox with gears or a chain gearbox can be used instead of the gear with toothed belt, etc.
  • Fig. 3 presents the structure of a dome section - elastomer (1), pushers (2), steel bars (3) and the reference plate (4).
  • Fig. 3 shows the dome with dimensions 1000 x 1000 mm, provided with 81 pushers (2) placed in 9 rows and 9 columns.
  • protruding elements (5) with openings for steel bars (3) are provided, which ensure shape transfer from the bars (3) onto the elastomer (1). This is shown in Fig. 4 .
  • Steel bars (3) pass through the end of the pusher (2): horizontal and vertical ( Fig. 5 ).
  • the steel bars (3) "model” the shape of the curve (parabola) ( Fig. 6-9 ).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
EP23461529.2A 2023-03-03 2023-03-03 Parabolischer reflektor mit veränderlicher form Withdrawn EP4425713A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23461529.2A EP4425713A1 (de) 2023-03-03 2023-03-03 Parabolischer reflektor mit veränderlicher form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23461529.2A EP4425713A1 (de) 2023-03-03 2023-03-03 Parabolischer reflektor mit veränderlicher form

Publications (1)

Publication Number Publication Date
EP4425713A1 true EP4425713A1 (de) 2024-09-04

Family

ID=85505455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23461529.2A Withdrawn EP4425713A1 (de) 2023-03-03 2023-03-03 Parabolischer reflektor mit veränderlicher form

Country Status (1)

Country Link
EP (1) EP4425713A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527166A (en) 1981-03-26 1985-07-02 Luly Robert A Lightweight folding parabolic reflector and antenna system
US4683475A (en) 1981-07-02 1987-07-28 Luly Robert A Folding dish reflector
US5440320A (en) * 1991-06-19 1995-08-08 Societe Nationale Industrielle Et Aerospatiale Antenna reflector reconfigurable in service
US20130076590A1 (en) * 2011-03-24 2013-03-28 Thales Actuation System for Antenna Reflector with Deformable Reflecting Surface
EP2702448A1 (de) 2011-04-27 2014-03-05 Bron Elektronik AG Falt-reflektor
CN104283000A (zh) 2013-07-09 2015-01-14 杨浩东 一种柔性抛物面天线及其固化方法
EP3480885A1 (de) 2017-11-01 2019-05-08 Elta Systems Ltd. Einsetzbarer antennenreflektor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527166A (en) 1981-03-26 1985-07-02 Luly Robert A Lightweight folding parabolic reflector and antenna system
US4683475A (en) 1981-07-02 1987-07-28 Luly Robert A Folding dish reflector
US5440320A (en) * 1991-06-19 1995-08-08 Societe Nationale Industrielle Et Aerospatiale Antenna reflector reconfigurable in service
US20130076590A1 (en) * 2011-03-24 2013-03-28 Thales Actuation System for Antenna Reflector with Deformable Reflecting Surface
EP2702448A1 (de) 2011-04-27 2014-03-05 Bron Elektronik AG Falt-reflektor
CN104283000A (zh) 2013-07-09 2015-01-14 杨浩东 一种柔性抛物面天线及其固化方法
EP3480885A1 (de) 2017-11-01 2019-05-08 Elta Systems Ltd. Einsetzbarer antennenreflektor

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