Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
  • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
  • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
  • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
  • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
  • H01Q19/132—Horn reflector antennas; Off-set feeding
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/18—Means for stabilising antennas on an unstable platform
• • 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
  • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
  • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
  • H01Q3/08—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation

Definitions

• 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 .
• 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.
• 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.
• 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.
• Figure 1 illustrates a dynamic vibration-dampened suspension device and a first rotation frame.
• Figure 2 illustrates in addition a first elevation frame.
• Figure 3 illustrates in addition a second elevation frame and a second rotation frame.
• Figure 4 illustrates in addition an antenna reflector and a transceiver horn.
• Fig. 1 illustrates a dynamic vibration-dampened suspension device 16 that includes an outer part 160 by means of which the device can be fitted firmly to an underlying support (e.g. a ship) and an inner part 161 which is secured to said outer part through the medium of said dynamic vibration- damping means 162 and which forms a support for a rotatably mounted first rotation frame 12.
• an outer part 160 by means of which the device can be fitted firmly to an underlying support (e.g. a ship) and an inner part 161 which is secured to said outer part through the medium of said dynamic vibration- damping means 162 and which forms a support for a rotatably mounted first rotation frame 12.
• the first rotation frame 12 is arcuate in shape and has upwardly extending end-parts 121, 122 and is adapted to rotate about a first (vertical) symmetry axis z-z with a direction perpendicular to the central, lower part 120 of the rotation frame.
• the bottom part of the frame is attached to a ring which includes a circular cog path, adapted to be rotated by a motor, and is thereby journalled around the whole of its periphery.
• Fig. 2 shows a first elevation frame 13 which is pivotally mounted in the end-parts 121, 122 of the first rotation frame 12 and which is adapted to rotate about a second symmetry axis x-x extending in parallel with a plane passing through the elevation frame 13.
• Fig. 3 shows a second elevation frame 14 which is rotatably journalled in the first elevation frame 13, and a second rotation frame 15 which is rotatably journalled in the second elevation frame 14.
• the second elevation frame 14 is adapted to rotate about a third symmetry axis y-y extending in parallel with the plane through the first elevation frame 13 and perpendicular to the second symmetry axis x-x.
• the second rotation frame 15 forms an attachment for the compact antenna unit and is adapted to rotate about a fourth symmetry axis p-p extending in a direction perpendicular to a symmetry plane through the second elevation frame 14.
• Each of the aforesaid four frames 12, 13, 14 and 15 is driven by a separate power unit located at an optimum drive distance, this distance being determined by the radius of respective frames from the rotational centre thereof.
• the compact antenna unit 10-11 includes antenna reflector 10 and transceiver horn 11, which are fastened to the second rotation frame 15.
• the mass of this unit can be balanced without providing extra counterweights in the arrangement, therewith enabling shorter reaction times to be achieved in the guiding process.
• the arrangement is controlled by a computerised process unit that includes a tracking unit for detecting optimum bearings to an external transmitter (e.g. satellite); sensor unit for detecting forces acting externally on the arrangement (e.g. wind and relative movement of said supporting surface) ; power unit for desired positional settings and associated corrections; and a computer unit for total control of and adjustment to said arrangement.
• a computerised process unit that includes a tracking unit for detecting optimum bearings to an external transmitter (e.g. satellite); sensor unit for detecting forces acting externally on the arrangement (e.g. wind and relative movement of said supporting surface) ; power unit for desired positional settings and associated corrections; and a computer unit for total control of and adjustment to said arrangement.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)
• Aerials With Secondary Devices (AREA)
• Details Of Aerials (AREA)
• Support Of Aerials (AREA)
• Burglar Alarm Systems (AREA)

Priority Applications (11)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20407375

Family Applications (1)

Country Status (16)

Cited By (3)

Families Citing this family (6)

Citations (2)

Family Cites Families (1)

• 1997
  • 1997-06-13 SE SE9702268A patent/SE9702268L/sv not_active IP Right Cessation
• 1998
  • 1998-06-12 PT PT98928786T patent/PT988659E/pt unknown
  • 1998-06-12 AU AU80499/98A patent/AU739987B2/en not_active Ceased
  • 1998-06-12 KR KR1019997011545A patent/KR100552541B1/ko not_active IP Right Cessation
  • 1998-06-12 CA CA002293563A patent/CA2293563C/en not_active Expired - Fee Related
  • 1998-06-12 WO PCT/SE1998/001134 patent/WO1998057389A1/en active IP Right Grant
  • 1998-06-12 IL IL13325698A patent/IL133256A/xx not_active IP Right Cessation
  • 1998-06-12 ES ES98928786T patent/ES2217562T3/es not_active Expired - Lifetime
  • 1998-06-12 EP EP98928786A patent/EP0988659B1/en not_active Expired - Lifetime
  • 1998-06-12 DE DE69823192T patent/DE69823192T2/de not_active Expired - Lifetime
  • 1998-06-12 US US09/445,438 patent/US6191749B1/en not_active Expired - Fee Related
  • 1998-06-12 JP JP50229799A patent/JP3915038B2/ja not_active Expired - Fee Related
  • 1998-06-12 AT AT98928786T patent/ATE264552T1/de not_active IP Right Cessation
  • 1998-06-12 DK DK98928786T patent/DK0988659T3/da active
• 1999
  • 1999-12-09 NO NO19996094A patent/NO319483B1/no not_active IP Right Cessation
• 2000
  • 2000-09-29 HK HK00106252A patent/HK1029227A1/xx not_active IP Right Cessation

Patent Citations (2)

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