EP0452077A1 - Arrangement d'antenne - Google Patents

Arrangement d'antenne Download PDF

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Publication number
EP0452077A1
EP0452077A1 EP91303099A EP91303099A EP0452077A1 EP 0452077 A1 EP0452077 A1 EP 0452077A1 EP 91303099 A EP91303099 A EP 91303099A EP 91303099 A EP91303099 A EP 91303099A EP 0452077 A1 EP0452077 A1 EP 0452077A1
Authority
EP
European Patent Office
Prior art keywords
arrangement
reflector
supporting strut
main reflector
sub
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Withdrawn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
EP91303099A
Other languages
German (de)
English (en)
Inventor
Timothy Andrew Gabriel
David Graham Spencer
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.)
Marconi Electronic Devices Ltd
Original Assignee
Marconi Electronic Devices Ltd
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 Marconi Electronic Devices Ltd filed Critical Marconi Electronic Devices Ltd
Publication of EP0452077A1 publication Critical patent/EP0452077A1/fr
Withdrawn legal-status Critical Current

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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
    • H01Q19/10—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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/193—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with feed supported subreflector

Definitions

  • This invention relates to antenna arrangements and more particularly to arrangements which are suitable for the reception of signals transmitted by a satellite.
  • Satellite signals may be received by directing a reflector dish towards the source of the signals and focussing them onto a feed.
  • the resulting structure is often unwieldy, having a large moment of inertia which makes accurate positioning and tracking of the antenna dish difficult.
  • the receiving assembly tends to appear unattractive and can be intrusive.
  • the present invention arose from an attempt to provide an improved antenna arrangement.
  • an antenna arrangement comprising a main reflector and a sub-reflector, the reflectors being supported by a common supporting strut which also acts as a waveguide.
  • a common supporting strut which also acts as a waveguide.
  • sub-components are located within the supporting strut such as, for example, a waveguide filter section.
  • a polariser arrangement is also located within the supporting strut. This may be a linear polariser alone or, say, a circular depolariser in combination with a linear polariser.
  • components of the receiving arrangement are located behind the front surface of the main reflector.
  • a low noise block down converter is located behind the reflector surface.
  • LNB low noise block down converter
  • the back feed configuration offers a lower profile with minimal projection from the front reflecting surface. It is therefore particularly suitable for transparent dish materials such acrylic or glass, reducing the intrusive nature of the installed assembly. This advantage is obtained even if a second LNB is included in the arrangement.
  • Back feed Cassegrain or Gregorian reflector assemblies are particularly suitable for the application of opaque or transparent radome covers because of their low profile.
  • LNB low noise amplifier
  • the common supporting strut supports two sub-reflectors.
  • the feed is directed away from the ground surface to reduce noise.
  • the supporting strut may be located either centrally or offset from the centre of the main reflector.
  • the invention may be advantageously applied to both receiving and transmitting arrangements.
  • a satellite receiving arrangement includes a main reflector 1 having a parabolic surface and sub-reflector 2 located at its focus to reflect incoming radiation along a waveguide 3 in the direction shown by the arrow.
  • the sub-reflector 2 may be of the Cassegrain type or the Gregorian type.
  • the waveguide 3 acts as a central supporting strut for the main reflector 1 and sub-reflector 2, extending through the centre of the main reflector 1.
  • the waveguide also 3 houses some components of the receiving arrangement.
  • a polyrod feed 4 is located at the end of the waveguide 3 nearest the sub-reflector 2 and receives radiation illuminating the sub-reflector 2 from the main parabolic reflecting surface 1.
  • the polyrod 4 is surrounded by a dielectric support cone 5 which also locates the sub-reflector 2 in respect of the polyrod phase centre and diffuses heat from the sun which might otherwise damage the polyrod feed 4.
  • the support cone 5 also protects the sub-reflector 2 and polyrod feed 4 from adverse effects of water, dew, ice and snow.
  • the shape of the dielectric support cone 5 reduces diffraction losses associated with small sub-reflectors and improves the illumination efficiency of the composite waveguide feed.
  • the polyrod 4 and dielectric cone 5 together provide a method of sealing the waveguide 3 from water which might otherwise drain into electronic circuitry at the far end of the waveguide 3.
  • the sub-reflector 2 and the polyrod feed 4 offer very low feed "blockage" compared to a metal horn type feed and therefore the polyrod feed 4 may be positioned relatively close to the sub-reflector 2.
  • the polyrod feed 4 is followed in the waveguide 3 by a filter section 6 which consists of a series of irises projecting from the inner surface of the waveguide 3.
  • the filter increases the system image projection and reduces any re-radiated signals produced by active electronic elements located further along the receiving system.
  • a circular depolariser 7 is located after the waveguide filter section 6 and comprises a dielectric wedge which tapers from the front of the feed outwardly to contact the inner surfaces of the waveguide 3.
  • the circular depolariser 7 converts circularly polarised waves, which may be left or right handed, into linearly polarised waves.
  • the circular depolariser 7 is followed by a ferrite linear polariser 8 which consists of a ferrite rod 9 surrounded by a bias coil 10.
  • the ferrite linear polariser 8 and the circular depolariser 7 are combined into a single component, the circular depolariser material being extended along the waveguide 3 to act as a former for the coil 10 and locate the ferrite rod 9 along the axis of the waveguide 3.
  • the received radiation is transmitted via a circular to rectangular waveguide transition 11 to a low noise block down converter (LNB) 12 which includes electronic receiving components.
  • LNB low noise block down converter
  • the circular to rectangular waveguide transition 11 includes one or more quarter wave transformers or taper sections to convert the circular waveguide mode to a rectangular mode for good matching at the LNB input.
  • the LNB 12 is positioned behind the main reflector surface 1 and is therefore shielded from direct sunlight. This ensures that the gain and noise parameters of the LNB 12 are relatively unaffected during hot weather conditions.
  • the LNB 12 may have additional protective covering without "blocking" any incoming signals.
  • the moment of inertia of the complete assembly is minimised.
  • Circular depolarisation may be achieved by using a circular depolarising grid rather than the dielectric wedge shown at 7.
  • a grid array is included at the sub-reflector plane.
  • FIG. 2 another arrangement in accordance with the invention is similar to that described with reference to figure 1 but includes two LNB's 13 and 14 located behind the front surface of the main reflector 15.
  • the arrangement includes an ortho-mode transducer 16 which enables the two LNB's 13 and 14 to be connected to the waveguide.
  • an offset signal support strut feed is used in conjunction with a dual reflector offset antenna. Dual satellite reception is achieved from the fixed dish assembly by using a secondary feed 17 to supplement the primary feed 18.
  • FIG. 4A With reference to figures 4A and 4B, another dual reflector offset antenna arrangement is illustrated in which a single support strut configuration is used.
  • the support strut is located centrally through the main reflector 19, the major axis of the elliptical reflector 19 being aligned in the horizontal axis as illustrated.
  • the back feed assembly may be used in a multiple feed configuration whereby two or more satellites may be received from one fixed antenna using the "beam steering" principal for two or more feeds. These additional back feeds can be offset or central and may be used with either back feed or forward feeds.

Landscapes

  • Aerials With Secondary Devices (AREA)
EP91303099A 1990-04-09 1991-04-09 Arrangement d'antenne Withdrawn EP0452077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9007976 1990-04-09
GB909007976A GB9007976D0 (en) 1990-04-09 1990-04-09 Antenna arrangement

Publications (1)

Publication Number Publication Date
EP0452077A1 true EP0452077A1 (fr) 1991-10-16

Family

ID=10674127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91303099A Withdrawn EP0452077A1 (fr) 1990-04-09 1991-04-09 Arrangement d'antenne

Country Status (4)

Country Link
EP (1) EP0452077A1 (fr)
JP (1) JPH04506740A (fr)
GB (2) GB9007976D0 (fr)
WO (1) WO1991015880A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101841082A (zh) * 2010-05-19 2010-09-22 广东通宇通讯设备有限公司 一种微波天线的馈源及微波天线
TWI419407B (zh) * 2010-06-21 2013-12-11 Wistron Neweb Corp 集波器
EP3648252A1 (fr) * 2018-11-05 2020-05-06 Eagle Technology, LLC Système réflecteur déployable à colonne à arceau maillé optique plié

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6469158B1 (en) * 1992-05-14 2002-10-22 Ribozyme Pharmaceuticals, Incorporated Synthesis, deprotection, analysis and purification of RNA and ribozymes
US5977343A (en) 1992-05-14 1999-11-02 Ribozyme Pharmaceuticals, Inc. Synthesis, deprotection, analysis and purification of RNA and ribozymes
US5804683A (en) * 1992-05-14 1998-09-08 Ribozyme Pharmaceuticals, Inc. Deprotection of RNA with alkylamine
US5686599A (en) * 1992-05-14 1997-11-11 Ribozyme Pharmaceuticals, Inc. Synthesis, deprotection, analysis and purification of RNA and ribozymes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2329555A1 (de) * 1973-06-09 1974-12-19 Philips Patentverwaltung Hochpassfilter fuer den ghz-bereich
WO1982000545A1 (fr) * 1980-07-28 1982-02-18 R Luly Reflecteur parabolique et son procede de fabrication
DE3231097A1 (de) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenne nach dem cassegrain-prinzip mit einer halterung fuer den subreflektor
EP0170726A1 (fr) * 1984-07-13 1986-02-12 Siemens Aktiengesellschaft Antenne directionnelle à double réflecteur
GB2182240A (en) * 1985-11-01 1987-05-13 Racal Antennas Limited Portable support; radio antenna arrangement
EP0304722A1 (fr) * 1987-08-12 1989-03-01 Siemens Aktiengesellschaft Antenne directionnelle pour systèmes relais

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664391A (fr) * 1942-10-17
GB606926A (en) * 1945-01-24 1948-08-23 Western Electric Co Improvements in directive antenna systems
BE466752A (fr) * 1945-07-21
US4306235A (en) * 1978-11-02 1981-12-15 Cbc Corporation Multiple frequency microwave antenna
NO864563L (no) * 1986-06-03 1987-12-04 Sintef Reflektorantenne med selvbaerende mateelement.
JPH0642610B2 (ja) * 1988-02-19 1994-06-01 工業技術院長 一次放射器の構造

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2329555A1 (de) * 1973-06-09 1974-12-19 Philips Patentverwaltung Hochpassfilter fuer den ghz-bereich
WO1982000545A1 (fr) * 1980-07-28 1982-02-18 R Luly Reflecteur parabolique et son procede de fabrication
DE3231097A1 (de) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenne nach dem cassegrain-prinzip mit einer halterung fuer den subreflektor
EP0170726A1 (fr) * 1984-07-13 1986-02-12 Siemens Aktiengesellschaft Antenne directionnelle à double réflecteur
GB2182240A (en) * 1985-11-01 1987-05-13 Racal Antennas Limited Portable support; radio antenna arrangement
EP0304722A1 (fr) * 1987-08-12 1989-03-01 Siemens Aktiengesellschaft Antenne directionnelle pour systèmes relais

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101841082A (zh) * 2010-05-19 2010-09-22 广东通宇通讯设备有限公司 一种微波天线的馈源及微波天线
TWI419407B (zh) * 2010-06-21 2013-12-11 Wistron Neweb Corp 集波器
EP3648252A1 (fr) * 2018-11-05 2020-05-06 Eagle Technology, LLC Système réflecteur déployable à colonne à arceau maillé optique plié

Also Published As

Publication number Publication date
WO1991015880A1 (fr) 1991-10-17
GB9107121D0 (en) 1991-05-22
GB2245103A (en) 1991-12-18
GB9007976D0 (en) 1990-06-06
JPH04506740A (ja) 1992-11-19

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