EP0978899A1 - Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm - Google Patents

Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm Download PDF

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Publication number
EP0978899A1
EP0978899A1 EP98500187A EP98500187A EP0978899A1 EP 0978899 A1 EP0978899 A1 EP 0978899A1 EP 98500187 A EP98500187 A EP 98500187A EP 98500187 A EP98500187 A EP 98500187A EP 0978899 A1 EP0978899 A1 EP 0978899A1
Authority
EP
European Patent Office
Prior art keywords
antenna
isoflux
type
dish
horn
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Withdrawn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
EP98500187A
Other languages
English (en)
French (fr)
Inventor
Luis Bustamente Cabrero
Francisco Vila Castellar
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.)
Radiacion y Microondas SA
Original Assignee
Radiacion y Microondas SA
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 Radiacion y Microondas SA filed Critical Radiacion y Microondas SA
Priority to EP98500187A priority Critical patent/EP0978899A1/de
Publication of EP0978899A1 publication Critical patent/EP0978899A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H01Q13/04—Biconical horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic

Definitions

  • the invention which is herewith defended consists of a shaped beam antenna (technically called of isoflux), from among the isoflux antenna for low orbit satellites.
  • the radiated power is distributed by means of a resonating cavity.
  • the cavity transmits power to the circular horn through a first coupling plate, by means of a conical guide section, and to the double cone through vertical or sloped grooves which charge the guide.
  • Said first coupling plate either circular or of any type, shall be symmetrical as regards the two perpendicular axis.
  • the antenna operates in circular polarization. Due to this, it is fed by a circular or squared circular guide polarizer (the polarizer is not the object of the invention).
  • the asymmetrical double cone may have totally or partially smooth or corrugated interior walls, as well as an inclination angle.
  • Isoflux antenna are known as least since the decade if the 80's. However, the type of antenna used up to the present is based on the use of a reflector. This signifies an essentially different structure and principle from the one described herein.
  • the isoflux antenna which are known up to now are made up of a greatly shaped symmetrical reflector, fed by antenna of the horn type, supported either by a centred mast or else by lateral struts (in the slang of this industrial activity generally known as struts).
  • This type of antenna has been used in the SPOT, ERSI satellites and is going to be used in the ENVISAT, of forthcoming launching.
  • the typical application of said antenna, as well as the one proposed by the invention, is for low orbit satellites (typically below 1.500 Km) for the spreading of data over the surface of the earth.
  • the advantage offered by the invention lies in a notable reduction in the size and weight of the antenna (key characteristics when dealing with space equipments). Likewise, it is considered that the cost of the same shall be very inferior to that of the reflector.
  • the invention which is the object of the present specification refers to an antenna which emits waves with circular polarization.
  • the entrance of the antenna is made of a guide of circular waves.
  • This guide is connected to a cylindrical cavity, resonating cavity, through a second coupling plate with a symmetrical opening according to two perpendicular axis.
  • the resonating cavity presents a series of equally spaced grooves on the side walls, in a number over four.
  • the grooves have an appropriate inclination in order to achieve a radiation in circular polarization.
  • the resonating cavity is connected to three elements which form part of the antenna. On one hand, it is connected to the circular guide by means of the second coupling plate which presents a symmetrical hole according to two perpendicular axis. It is additionally connected to an asymmetrical double cone structure, through the previously indicated side grooves. And finally, to a circular antenna of the horn type through the first coupling plate, which joins it to a conical guide section.
  • the inclination angle of the double cones is the appropriate one to achieve the beam shape.
  • the surface of the double cones may be smooth or corrugated, depending on the specification imposed on the radiation diagram.
  • the antenna of the horn type offers a diagram which fills the central part (around the symmetry axis), completing the lateral contribution of the double cone structure, so that the totally desired diagram is achieved.
  • the dimensions of the conical or circular guide are such, that the phases of the diagrams of the double cone structure and the antenna of the horn type are the appropriate ones in order to meet the specifications of coverage.
  • the indicated elements may be manufactured in various parts which are screwed to each other by means of flanged unions.
  • the assembly offers a radiation diagram which has a maximum at the coverage edge (between 45" and 70° of the symmetry axis), and the gain of which is reduced as the angle closes towards the symmetry axis, with a minimum axial and azimuthal ripple.
  • the assembly has a polarizer connected at the entrance which provides a signal with circular polarization.
  • This polarizer may be of any type of the ones already known, and does not form part of the invention.
  • the three coupling plates fulfill the mission of the adaptation of impedances to achieve a maximum power transmission.
  • the invention which is herewith defended, consists of a dish-type isoflux antenna, from among the isoflux antenna for low orbit satellites.
  • the antenna is fed by a polarizer (not included in any of the figures) which is adapted, for a maximum delivery of power, to the entrance of the antenna.
  • This polarizer is not the object of the present invention.
  • a coupling plate (1) is to be found, which connects the polarizer with the circular wave guide (2).
  • the circular wave guide (2) has an appropriate diameter so that only the dominant TE 11 mode, in circular guide, can be spread.
  • the circular guide (2) is joined on the same piece to a cylindrical resonating cavity (3), which presents 16 sloped grooves.
  • the cylindrical cavity (3) is completely open at an upper end.
  • the circular guide (2) and the cylindrical cavity (3) are connected to each other by means of a coupling plate (4), with an opening in the shape of a cross (4.1).
  • said plate (4) forms, with the resonating cavity (3) and the wave guide (2), a single piece.
  • the dimensions of the cross (4.1), together with the opening (1.1) of the plate (1), are as appropriate, for the correct adaptation of the antenna.
  • the length of the circular wave guide (2) is also determined for the appropriate adaptation of the antenna.
  • the coupling plate (1) is a different piece, 0.5 mm thick, with a centred circular opening, and holes which coincide with those of the flange of the guide (2).
  • Two double conical structures are machined on the piece which forms guide (2), plate (4), and resonating cavity (3): an upper double conical structure (5), which has two flared angles, and the lower double conical structure (6) which present one single angle. Both structures are finished off in flanges with suitable holes for their union with the conical plates (8) and (9).
  • the entrance of the guide (2) is also a flange with holes, for their union to the piece (1) and to the polarizer.
  • the guide (2) On its upper part, the guide (2) has also various holes, between 4 and 6, for their union to the conical wave guide (7).
  • the conical plate (8) has a circular flange on its central part for its union by means of screws to the guide (2) by means of the double conical structure (6). On its outer end, it carries a ring (10) with a "Z" shaped section, which is bonded, forming a ring technically named as "chock".
  • the conical plate (9) also presents a circular flange on its central part for its union by means of screws to the guide (2), by means of the upper double conical structure (5). Likewise, at an outer end, it carries a bonded ring (11), one section in "Z" shape, which also forms a chock.
  • the two conical plates (8) and (9) form an asymmetrical double conical structure.
  • the coupling plate (12) presents a thickness of 0.5 mm, is externally circular and has an opening in the shape of a cross (12.1) at its symmetry axis (figure 4), and the holes for their union to the upper part of the resonating cavity (3).
  • the conical wave guide (7) has flanges at both ends. At their lower end it is connected to the resonating cavity (3), enclosing the phase sifting element (12) between both.
  • the conical wave guide (7) At the upper zone of the conical wave guide (7), it is attached by means of screws to the corrugated horn (13).
  • the diameters and length of the conical wave guide (7) are attached to achieve that the diagram phase radiated by the conical plates (8) and (9) and the horn (13) be appropriate.
  • the dimensions of the coupling plate (12) are attached so that the radiation between the conical plates (8) and (9) and the horn (13) be adequate in power and phase in order to obtain the desired diagram.
  • the horn (13) is a cylindrical structure with two or more corrugations, screwed to the conical wave guide (7) by means of countersunk screws.
  • All the assembly has symmetry of revolution, excluding the sloped grooves.
  • the coupling plate (12) can be substituted or complemented by a phase shifting element constituted by means of circular guide sections.

Landscapes

  • Waveguide Aerials (AREA)
EP98500187A 1998-08-06 1998-08-06 Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm Withdrawn EP0978899A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98500187A EP0978899A1 (de) 1998-08-06 1998-08-06 Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98500187A EP0978899A1 (de) 1998-08-06 1998-08-06 Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm

Publications (1)

Publication Number Publication Date
EP0978899A1 true EP0978899A1 (de) 2000-02-09

Family

ID=8235830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98500187A Withdrawn EP0978899A1 (de) 1998-08-06 1998-08-06 Parabolförmige Antenne mit Isoflux-Strahlungsdiagramm

Country Status (1)

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EP (1) EP0978899A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2947391A1 (fr) * 2009-06-30 2010-12-31 Thales Sa Systeme antennaire compacte omnidirectionnel et large bande comportant deux acces emission et reception separes fortement decouples
FR2947389A1 (fr) * 2009-06-30 2010-12-31 Thales Sa Dispositif d'extension de bande modulable pour antenne omnidirectionnelle tres large bande
WO2014049400A1 (en) * 2012-09-26 2014-04-03 Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi Omnidirectional circularly polarized waveguide antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568203A (en) * 1967-11-01 1971-03-02 Mc Donnell Douglas Corp Direction finding antenna assembly
US4143377A (en) * 1976-11-30 1979-03-06 Thomson-Csf Omnidirectional antenna with a directivity diagram adjustable in elevation
EP0456034A2 (de) * 1990-05-07 1991-11-13 Hughes Aircraft Company Doppelkonus-Antenne mit halbkugelförmiger Strahlungscharakteristik

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568203A (en) * 1967-11-01 1971-03-02 Mc Donnell Douglas Corp Direction finding antenna assembly
US4143377A (en) * 1976-11-30 1979-03-06 Thomson-Csf Omnidirectional antenna with a directivity diagram adjustable in elevation
EP0456034A2 (de) * 1990-05-07 1991-11-13 Hughes Aircraft Company Doppelkonus-Antenne mit halbkugelförmiger Strahlungscharakteristik

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MONSER ET AL.: "Omnidirectional K-Band Antenna Uses Slots, Probes and Horns", ELECTRONICS, vol. 34, 18 August 1961 (1961-08-18), NEW YORK US, pages 54 - 55, XP002090154 *
ROTH H ET AL: "FUNDAMENTAL DESIGN ASPECTS FOR THE DEVELOPMENT OF A HIGHLY SHAPED ANTENNA AND BREADBOARD MEASUREMENTS", EUROPEAN CONFERENCE ON SATELLITE COMMUNICATIONS, MANCHESTER, NOV. 2 - 4, 1993, no. CONF. 3, 2 November 1993 (1993-11-02), INSTITUTION OF ELECTRICAL ENGINEERS, pages 399 - 403, XP000458044 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2947391A1 (fr) * 2009-06-30 2010-12-31 Thales Sa Systeme antennaire compacte omnidirectionnel et large bande comportant deux acces emission et reception separes fortement decouples
FR2947389A1 (fr) * 2009-06-30 2010-12-31 Thales Sa Dispositif d'extension de bande modulable pour antenne omnidirectionnelle tres large bande
WO2011000702A1 (fr) * 2009-06-30 2011-01-06 Thales Dispositif d'extension de bande modulable pour antenne omnidirectionnelle tres large bande
WO2011000703A1 (fr) * 2009-06-30 2011-01-06 Thales Systeme antennaire compacte omnidirectionnel et large bande comportant deux acces emission et reception separes fortement decouples
WO2014049400A1 (en) * 2012-09-26 2014-04-03 Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi Omnidirectional circularly polarized waveguide antenna

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