EP0383657B1 - Antennensystem zum Empfangen von Direkt-Rundfunk-Übertragungs-Satelliten - Google Patents

Antennensystem zum Empfangen von Direkt-Rundfunk-Übertragungs-Satelliten Download PDF

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Publication number
EP0383657B1
EP0383657B1 EP90400358A EP90400358A EP0383657B1 EP 0383657 B1 EP0383657 B1 EP 0383657B1 EP 90400358 A EP90400358 A EP 90400358A EP 90400358 A EP90400358 A EP 90400358A EP 0383657 B1 EP0383657 B1 EP 0383657B1
Authority
EP
European Patent Office
Prior art keywords
antenna
reflector
antenna system
support foot
tubular body
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.)
Expired - Lifetime
Application number
EP90400358A
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English (en)
French (fr)
Other versions
EP0383657A1 (de
Inventor
Claude Cluniat
Maurice Loiseau
Guy Bastard
Jean-Jacques Lombard
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.)
LGT Laboratoire General des Telecommunications
Thomson LGT Laboratoire General des Telecommunications
Original Assignee
LGT Laboratoire General des Telecommunications
Thomson LGT Laboratoire General des Telecommunications
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 LGT Laboratoire General des Telecommunications, Thomson LGT Laboratoire General des Telecommunications filed Critical LGT Laboratoire General des Telecommunications
Priority to AT90400358T priority Critical patent/ATE101304T1/de
Publication of EP0383657A1 publication Critical patent/EP0383657A1/de
Application granted granted Critical
Publication of EP0383657B1 publication Critical patent/EP0383657B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/247—Supports; Mounting means by structural association with other equipment or articles with receiving set with frequency mixer, e.g. for direct satellite reception or Doppler radar
    • 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
    • H01Q1/125—Means for positioning

Definitions

  • the invention relates to the field of reception of direct broadcast TV satellites, and more particularly to a reception antenna system.
  • D. B. S (Direct Broadcasting Satellite) satellites such as TDF 1, TV SAT, OLYMPUS, BSD etc ... different kinds of known antennas could be used:
  • a first known type of antenna uses a paraboloid of revolution, with a source placed at the focus of this paraboloid.
  • the antenna access is carried out either directly at the focal point of the parabola, at the source access, or at the rear of the antenna with a stick in the form of a guide making the connection between the source and the rear of the antenna.
  • the antenna is placed on a support sized according to the size of the dish, this support allowing pointing in azimuth and in elevation towards the satellite to be received.
  • this type of antenna is that the shadow cast by the source, its support, and its holding arms masks part of the reflector, which leads to a reduction in efficiency.
  • the use of a waveguide to gain access to the rear of the antenna makes it possible to protect the low noise converter (LNB) but causes a loss of transmission which results in a decrease in gain and a increased antenna noise temperature.
  • this type of antenna is of high cost, in particular because of the number of mechanical parts to be used to produce the antenna structure and allow its orientation.
  • the latest developments in this type of antenna have made it possible, thanks to FET AsGa transistors, to obtain low noise converters small dimensions that could have been placed directly behind the source, at the focal point of the dish so as to reduce transmission losses.
  • the mask on the reflector is further increased, in particular for small diameter antennas.
  • the electronics are then subjected more directly to climatic conditions, temperature variations in particular, and to induced vibrations.
  • An eccentric parabolic reflector This type of antenna is commonly called an "off-set" antenna. It is an antenna whose reflector consists of a portion of paraboloid of revolution, the source, spaced from the axis of this paraboloid, not casting a shadow on the opening. For this, the reflector is obtained by cutting a paraboloid by a cylinder of diameter D, centered on an axis parallel to the focal axis of the paraboloid. The source is then placed at the focal point F of the paraboloid and targets the middle of the paraboloid portion. The antenna access is generally carried out at the source access, the low noise converter then being placed directly behind the source, in front of the reflector.
  • this "off-set" structure is the increase in the efficiency of the antenna by reducing the mask effect of the source, the more the antenna is not very sensitive to climatic conditions and by its structure l he antenna pointing towards the satellite is practically vertical.
  • this second type of antenna also has significant drawbacks: the production of this type of reflector, which is not of revolution, is difficult and unsuitable for manufacture by embossing or stamping.
  • the radiation patterns of the antenna are not of revolution and the ellipticity rate of an antenna of this type, used in circular polarization is higher than with an antenna using a reflector in the form of a paraboloid of revolution. .
  • the low noise converter is placed in front of the reflector, and therefore subject to climatic conditions (temperature in particular).
  • the reference plane in elevation is not easily defined, it is not easy to point the antenna towards the satellite to receive.
  • an antenna system for reception of a direct broadcast satellite is characterized in that it comprises a parabolic reflector, the rear central part of which is fixed to a hollow tubular body of a support leg via a fixing piece, the reflector, the fixing piece and the tubular body of the support leg being traversed by a tube of the same axis as the reflector, containing the source and forming protection and means for centering the source in the reflector, the tubular body of the support leg being articulated at its base on a horizontal axis carried by a base and associated with blocking means fixing the elevation of the antenna, the base being movable in rotation about a vertical axis to fix the azimuth of the antenna, all the circuits of the antenna system and its electrical supply means being fixed inside the tubular body of the support leg.
  • Figure 1 is a sectional diagram of a first embodiment of the antenna system according to the invention.
  • Figure 2 is a second embodiment of the antenna system according to the invention.
  • the embodiments described in detail are specially adapted for the reception of satellites transmitting in the band 11.7 to 12.5 GHz, in right or left circular polarization.
  • the antenna can be modified to be adapted to another frequency band or to other types of polarization.
  • the antenna system according to the invention mainly consists of an antenna with its diameter reflector adapted to the power received from the satellite and its source, of a support leg ensuring the geometry of the antenna and simultaneously allowing its adjustment for pointing the satellite, and electronic circuits essentially the low noise converter amplifier, possibly supplemented by other circuits.
  • FIG. 1 represents the embodiment of the antenna system according to the invention for the reception of the TDF satellite 1 which radiates a power of 63 dBW: the reflector 1 of the antenna is a parabolic reflector of diameter 0.33 meter.
  • the system can be adapted to larger diameters for powers emitted by other smaller satellites, up to 0.7 meters without modification, for example for ASTRA which radiates a power of 52 dBW.
  • the reflector 1 is a paraboloid of revolution whose ratio between the focal distance and the diameter is 0.3, which taking into account the diameter of 0.33 m leads to a focal distance of 97 mm.
  • the opening angle of the dish is 161 °.
  • This reflector is made of aluminum 15 tenths of a millimeter thick, and is obtained by flow spinning for small quantities or by stamping for larger quantities.
  • This reflector 1 is fixed directly by its central part to the support leg as will be explained below.
  • the source allows the reception of signals in circular polarization of the frequency band 11.7 to 12.5 GHz.
  • This source consists of a semi rigid coaxial cable with PTFE dielectric, under copper tube, 2, surmounted by the illuminant 3 which uses the radiation properties of the surface waves: this illuminant 3 is in the form of a helix or any other source allowing the electronics to be transferred to the rear of the antenna reflector.
  • the illuminant is a helix whose turns were obtained by winding on a cylinder with a diameter of 6 mm with a pitch of 12 mm, the angle of inclination of the turns being 30 °.
  • the attenuation provided by the semi-rigid coaxial cable used in the 12 GHz band is of the order of 1.5 dB per meter, which translates for the antenna described by a reduction in gain of the order of 0 , 2 dB. Due to the structure of the source relative to the reflector, the losses created by the masking of the reflector by the source are limited to 0.01 dB.
  • This source (coaxial cable surrounded by the helical illuminant) is fixed in a polypropylene tube 4 of the same axis as the reflector which it crosses at its center; this tube, closed at its end on the illuminating side by a cap 5, forms a radome and ensures leaktightness.
  • the measured radome losses are at 0.2 dB use frequencies.
  • the tube 4 is held in position in a centering piece 6 fixed on the one hand to the rear of the reflector, on the other hand to a hollow tube 7 forming the body of the support leg. This ensures the rigidity of the supply line.
  • the source is centered in the tube 4 and held in position by the part 6 centered at the rear of the reflector, itself held by means of screws on the body 7 of the foot support.
  • the centering and the longitudinal positioning of the source With respect to the reflector.
  • the dimensioning of the body 7 of the support leg is such that the replacement of the reflector is possible by simple removal of the fixing screws of the latter on the part 6 and as indicated above, the diameter of the reflectors can be modified.
  • the source, supply and conversion head assembly 10 is fixed in the body of the support leg 7 by means of a part 8.
  • the conversion head secured to the body of the support foot is protected from runoff by a cover 9 which protects it from the weather, this cover closing the upper part of the tube 7 forming the body of the support foot.
  • a cover 9 which protects it from the weather, this cover closing the upper part of the tube 7 forming the body of the support foot.
  • the tube 7 forming the support leg 2 is not closed, which allows air circulation preventing condensation due to this opening in the lower part.
  • the reception access at the outlet of the support leg is effected by means of a cable 20 secured to the conversion head 10 and passing through an opening made in the lower part of the body 7 of the support leg.
  • the reflector, source and conversion head assembly is compact and contains all the elements necessary to receive satellite signals.
  • the assembly described above is held on a base by means of two screws 15 carrying out an articulation on a vertical tube 11 which allows the tilting of the antenna around a horizontal axis XX.
  • the tube 11 of this movable part supports the body 7 of the oscillating foot on the axis defined by the two screws 15 shown in the partial section AA of FIG. 1.
  • the elevation of the antenna is adjusted by moving a screw 26, in a maximum sector defined by a movable stop 17, the blocking and immobilization after adjustment being effected by the blocking of the screws 15 and the movable stop.
  • this support leg All the parts of this support leg are made of aluminum, and all the shapes adopted are simple shapes which can, for very large series, be obtained by molding or stamping, thus minimizing production costs.
  • the positioning indexes placed for the adjustment of the elevation and azimuth axes include graduations and possibly the indication of the pointed satellites.
  • FIG. 2 represents an embodiment of an antenna according to the invention thus simplified intended to be fitted directly into a standard tube; the same references designate the same elements as in FIG. 1.
  • the base of the support tube 11 is directly fitted into a standard support tube external to the antenna system, 50.
  • the horizontal part of the support base is eliminated, and the reference axis is given directly by the standard tube positioned vertically for this purpose.
  • This figure also shows in strong lines the parabolic reflector 1 of 0.33 meters in diameter, and in broken lines a reflector 1 'of a different diameter, for example 0.7 meters.
  • the support tube 7 has been shown in three different positions, one in solid lines and the other two in broken lines to show the possible angular movement of the system.
  • the source has been shown in the figures as a simple helix having a free end.
  • This type of source is perfectly suited to circular polarization transmissions from a satellite such as TDF 1.
  • TDF 1 satellite a satellite
  • the source will be adapted to the polarization mode of satellite transmissions.
  • the polarization for transmissions from the TDF 1 satellite is circular
  • the polarization for the transmissions received from the ASTRA satellite is expected to be horizontal or vertical.
  • some satellites will transmit in two circular polarizations, right and left.
  • the corresponding sources will be adapted to the reception of these different types of polarizations.
  • the tube 4 forming a radome can be made of a material other than polypropylene, provided that this material does not create losses.
  • the structure thus obtained for the antenna system is particularly compact and very easy to install: all the seals are made in the factory and no particular precautions are necessary during installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Radio Relay Systems (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Claims (7)

  1. Antennensystem für den Empfang von Direktrundfunkühertragungssatelliten, mit einem Parabolreflektor (1), dessen hinterer Mittelteil über ein Befestigungsteil (6) an einem Hohlrohrkörper (7) eines Stützfußes befestigt ist, dadurch gekennzeichnet, daß durch den Reflektor (1), das Befestigungsteil (6) und den Rohrkörper des Stützfüßes ein Rohr (4) mit derselben Mittelachse wie der Reflektor verläuft, welches die Quelle (2, 3) enthält und einen Schutz sowie ein Zentriermittel für die Quelle im Reflektor bildet, wobei der Rohrkörper (7) des Stützfußes mit seiner Basis an einer horizontalen Achse (XX) angelenkt ist, die von einem Sockel getragen wird und mit Blockiermitteln (26) verbunden ist, die den Höhenwinkel der Antenne festlegen, wobei der Sockel um eine vertikale Achse drehbar ist, um den Azimutwinkel der Antenne festzulegen, wobei sämtliche Schaltungen des Antennensystems und deren Mittel zur elektrischen Versorgung im Inneren des Rohrkörpers des Stützfußes befestigt sind.
  2. Antennensystem gemäß Anspruch 1, dadurch gekennzeichnet, daß der Sockel des Stützfußes ein Rohr (11) ist, das dazu bestimmt ist, einfach in ein Standardrohr mit vertikaler Achse (50) eingeschoben zu werden, welches üblicherweise für Funkempfangsantennen verwendet wird.
  3. Antennensystem gemäß Anspruch 1, dadurch gekennzeichnet, daß der Sockel des Stützfußes aus zwei Teilen gebildet ist:
    - einem ersten Teil (21), der dazu bestimmt ist, an einer horizontalen oder vertikalen Stütze befestigt zu werden,
    - einem zweiten Teil (24), der in bezug auf den ersten um eine vertikale Achse drehbar ist, um den Azimutwinkel der Antenne festzulegen.
  4. Antennensystem gemäß Anspruch 3, dadurch gekennzeichnet, daß der feste Teil (21) des Sockels des Stützfußes mit einer Libelle versehen ist, die eine Bezugsebene definiert, in bezug auf die die Einstellung des Höhenwinkels genau erhalten wird.
  5. Antennensystem gemäß Anspruch 4, dadurch gekennzeichnet, daß an dem drehbaren Teil (24) des Sockels und an dem Rohrkörper des Stützfußes (7) Skaleneinteilungen vorgesehen sind, um die Azimut- und die Höhenachse der Antenne bei ihrer Installation zu markieren.
  6. Antennensystem gemäß Anspruch 1, dadurch gekennzeichnet, daß der Rohrkörper des Stützfußes in seinem Teil, der sich am nächsten am Reflektor befindet, dicht verschlossen ist, und in seinem Teil, der vom Reflektor am weitesten entfernt ist, offen ist.
  7. Antennensystem gemäß Anspruch 1, dadurch gekennzeichnet, daß für den Empfang von einem Satelliten, der zirkular polarisierte Wellen aussendet, die Quelle aus einem mit einem Koaxialkabel (2) verbundenen schraubenförmigen Strahler (3) gebildet ist, wobei diese Gesamtheit in dem zylindrischen Rohr (4) zentriert ist, das aus einem keinerlei Verluste erzeugenden Material gebildet ist.
EP90400358A 1989-02-17 1990-02-09 Antennensystem zum Empfangen von Direkt-Rundfunk-Übertragungs-Satelliten Expired - Lifetime EP0383657B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90400358T ATE101304T1 (de) 1989-02-17 1990-02-09 Antennensystem zum empfangen von direkt-rundfunk- uebertragungs-satelliten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902082A FR2643511B1 (fr) 1989-02-17 1989-02-17 Systeme d'antenne pour reception de satellite de diffusion directe
FR8902082 1989-02-17

Publications (2)

Publication Number Publication Date
EP0383657A1 EP0383657A1 (de) 1990-08-22
EP0383657B1 true EP0383657B1 (de) 1994-02-02

Family

ID=9378878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400358A Expired - Lifetime EP0383657B1 (de) 1989-02-17 1990-02-09 Antennensystem zum Empfangen von Direkt-Rundfunk-Übertragungs-Satelliten

Country Status (8)

Country Link
EP (1) EP0383657B1 (de)
JP (1) JPH02246401A (de)
AT (1) ATE101304T1 (de)
BR (1) BR9000693A (de)
CA (1) CA2010255A1 (de)
DE (1) DE69006372T2 (de)
ES (1) ES2048984T3 (de)
FR (1) FR2643511B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671433B1 (fr) * 1991-01-04 1993-08-20 Thomson Csf Systeme de protection globale d'une antenne contre les perturbations electromagnetiques.
DE9408343U1 (de) * 1994-05-20 1994-09-22 Delega Group Management S A Satellitenantenne
FR2754940A1 (fr) * 1996-10-23 1998-04-24 Coprebat Dispositif support d'antenne permettant d'assurer les reglages aupres de la zone de fixation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1918084B2 (de) * 1969-04-09 1972-09-07 Anton Kathrein, Älteste Spezialfabrik für Antennen und Blitzschutzapparate, 8200 Rosenheim Empfnagssystem fuer hohe frequenzen mit einer parabolantenne, einem frequenzumsetzer und einer koaxialleitung
FR2471058A3 (fr) * 1979-12-07 1981-06-12 Thomson Brandt Support d'antenne pour reception de satellite geo-stationnaire, et antenne munie d'un tel support
DE3125593A1 (de) * 1981-06-30 1983-05-26 AEG-Telefunken Nachrichtentechnik GmbH, 7150 Backnang Antennenhalterung
JPS6075103A (ja) * 1983-09-30 1985-04-27 Matsushita Electric Ind Co Ltd パラボラアンテナの取付装置
CA1257694A (en) * 1985-08-05 1989-07-18 Hisamatsu Nakano Antenna system
EP0244969A3 (de) * 1986-05-02 1989-03-08 Borg-Warner Chemicals Europe BV Antenne zum Empfangen von Direkt-Rundfunkübertragungs-Satelliten

Also Published As

Publication number Publication date
FR2643511A1 (fr) 1990-08-24
DE69006372T2 (de) 1994-05-11
CA2010255A1 (en) 1990-08-17
ES2048984T3 (es) 1994-04-01
FR2643511B1 (fr) 1991-04-19
ATE101304T1 (de) 1994-02-15
EP0383657A1 (de) 1990-08-22
JPH02246401A (ja) 1990-10-02
BR9000693A (pt) 1991-01-22
DE69006372D1 (de) 1994-03-17

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