EP0108693A1 - Hochleistungsdrehbare Verbindung für eine Doppelband-Antenne - Google Patents

Hochleistungsdrehbare Verbindung für eine Doppelband-Antenne Download PDF

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Publication number
EP0108693A1
EP0108693A1 EP83402150A EP83402150A EP0108693A1 EP 0108693 A1 EP0108693 A1 EP 0108693A1 EP 83402150 A EP83402150 A EP 83402150A EP 83402150 A EP83402150 A EP 83402150A EP 0108693 A1 EP0108693 A1 EP 0108693A1
Authority
EP
European Patent Office
Prior art keywords
band
waves
rotary joint
joint according
guide
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.)
Granted
Application number
EP83402150A
Other languages
English (en)
French (fr)
Other versions
EP0108693B1 (de
Inventor
Jean Bouko
Claude Aubry
François Salvat
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.)
Thales SA
Original Assignee
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0108693A1 publication Critical patent/EP0108693A1/de
Application granted granted Critical
Publication of EP0108693B1 publication Critical patent/EP0108693B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/06—Movable joints, e.g. rotating joints
    • H01P1/062—Movable joints, e.g. rotating joints the relative movement being a rotation
    • H01P1/066—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation
    • H01P1/067—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation the energy being transmitted in only one line located on the axis of rotation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Definitions

  • the present invention relates to power rotary joints intended to equip antennas operating simultaneously on two different frequency bands.
  • Rotating joints fitted to the radar antennas provide the link between the fixed and mobile parts of the aircraft.
  • the excitation mode of the waves must necessarily present a symmetry of revolution.
  • Rotating joints are generally made in rigid coaxial line or in circular guide.
  • the frequencies of the lowest band facilitate the designation of the objective and the frequencies of the highest band allow to increase the discriminating power, which makes it possible for example to work at low sites because thus the effect is eliminated target image.
  • the rotary joints used in double-band antennas according to the prior art are joints with concentric coaxial conductors. It is obvious that these joints do not allow working at frequencies belonging to the bands KA, X, W because the relation ⁇ ⁇ 2 1 r (a + b) linking the wavelength in air ⁇ and the diameters a and b coaxial conductors leads to mechanical incompatibilities.
  • the wavelengths are of the order of a millimeter, the joints must have too small dimensions and cannot be produced.
  • the present invention proposes a power rotary joint intended to equip double-band antennas, the highest working frequencies of which may belong to the ranges KA, X, W, the ratio between the highest frequencies and the lowest must at least be equal to four which is commonly the case, since it is generally of the order of seven or eight.
  • the present invention therefore relates to a rotary power joint for a dual-band antenna intended to make a connection between the fixed and mobile parts of the antenna to transmit waves.
  • electromagnetic belonging to two different frequency bands constituting a composite beam characterized in that it comprises a cylindrical microwave waveguide having a fixed part and a movable part, capable of transmitting the composite beam, this guide comprising a first and a second input in its fixed part to receive electromagnetic waves belonging respectively to a first and to a second frequency band, the waves of these two bands propagating in the guide and forming the composite beam; a first outlet in its mobile part for delivering only the waves of the first band; and a second outlet in its mobile part to deliver only the waves of the second band.
  • high band or low band and high frequencies or low frequencies are used, it is understood that these terms are used only to distinguish the two types of frequency bands, these frequencies being very high and possibly belonging to bands L, S, C, X, KA, W.
  • FIG. 1 there is shown a power rotary joint according to the invention.
  • This joint is intended to transmit to an antenna, a composite beam consisting of two beams of electromagnetic waves of different frequencies from different sources.
  • the frequencies to be transmitted belong for example to the C-KA bands or X-KA, or XW bands.
  • the length L is defined in such a way that the propagation of the high frequencies takes place in the "Rayleigh"zone; L ⁇ being the highest wavelength of the high frequencies.
  • the cylindrical part in fact comprises a fixed part 2 and a mobile part 3.
  • the two parts are interconnected by a mechanism, known per se, which makes it possible to obtain a rotational movement around the axis XX 'of the guide, of one of the parties in relation to the other.
  • This guide 1 comprises, perpendicular to each of its ends, a rectangular guide section 4 and 5.
  • One of these sections 4 makes it possible to supply the guide with waves from a source S2 whose frequencies belong to the band bass selected.
  • the other section 5 allows these waves to be emitted in the direction given by the movable part 3 of the guide.
  • the two straight sections of the cylindrical guide 1 are terminated by a circular plate referenced respectively 6 and 7 of radius r.
  • These plates 6 and 7 are spatial frequency filters.
  • the filter 6 allows the guide to be supplied with waves from a source SI whose frequencies belong to the chosen high band.
  • the filter 7 allows only these waves to pass.
  • the waves of the low band are guided, they are reflected on the walls of the guide while the waves of the upper band propagate as in free space.
  • the waves are polarized and the source SI can emit a beam of electromagnetic waves with circular or radial polarization in accordance with modes TE01 and TM01. These two modes are the only ones not to be disturbed by the rotation of the movable part 3 of the joint.
  • the source S2 emits after transformation a beam of electromagnetic waves with radial polarization TM01. This mode is excited, in a manner known per se, by means of two irises placed at the transition between the rectangular guides 4 and 5 and the cylindrical guide 1. A description of this mode of excitation can be found in the review entitled Ragan's "Microwave Transmission Circuits" on page 387.
  • FIG. 2 illustrates a particular embodiment of a focusing device making it possible to supply the cylindrical guide in the chosen high band (W for example).
  • the source S2 supplies the guide 1 in the low band by electromagnetic waves with rectangular polarization which are transformed into radial polarization inside the rectangular guide 4. These waves are reflected perpendicular to their direction by the filter 6 considered for these frequencies as A short-circuit.
  • the two types of waves forming a composite beam propagate independently without disturbing themselves inside the guide.
  • the dual-frequency composite beam decomposes.
  • the waves of the low band are reflected on the filter 7 and leave in a direction perpendicular to the optical axis XX 'in the guide 5.
  • the waves of the high band pass through the filter 7 and are again reflected by a second reflecting mirror 9.
  • This mirror 9 has the same axis XX 'as the mirror 8. It converges the waves at a point F located on an axis perpendicular to the axis XX'.
  • the radiation is intercepted at this point by a waveguide which can, for example, be an electromagnetic horn.
  • the mirrors 8 and 9 are ellipsoids of revolution situated on the same optical axis XX '.
  • the two ellipsoids are said to be "confocal", because one of the foci of one of the ellipsoids is located at the top of the other and vice versa, the other focal point being located in the phase center of the sources S1 and S2.
  • F2 is one of the focal points of the mirror 9, it is also the apex of the mirror 8.
  • the focal point F'2 is one of the focal points of the mirror 8, it is also the apex of the mirror 9. This arrangement has the advantage of having very low losses.
  • the device comprises two dielectric lenses 10, 11, convex plane and having the same optical axis XX '.
  • the emission source SI is placed at the focal point of the lens 10, on the axis XX '.
  • the reception source S is placed at the focal point F of the lens 11 on the axis XX '.
  • the waves of the high band are transmitted in the direction X'X.
  • Figure 5 is an enlarged view of part of the metal network used in the previous example.
  • Small square metal plates 10 a few tens of micrometers thick and generally made of copper are arranged according to FIG. 5 on each of the faces of the layer of central dielectric material 12.
  • These squares of side a, separated from one another by a distance d can be made, for example, by photoetching or milling a layer of metallized dielectric material on its two faces (the plates 10 are rectangular when the angle of incidence 8 is not normal to these plates).
  • the dimensions of the squares are chosen according to the frequencies to be filtered.
  • the particularity of this preferred embodiment is to be able to filter electromagnetic waves of a given band, whatever the polarization of these waves.
  • the rotary joint as it has been described makes it possible to transmit two beams of electromagnetic waves of frequencies belonging to two different bands, for example C-KA or KA-X or X-W.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Connection Structure (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP83402150A 1982-11-09 1983-11-04 Hochleistungsdrehbare Verbindung für eine Doppelband-Antenne Expired EP0108693B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8218803A FR2535904B1 (fr) 1982-11-09 1982-11-09 Joint tournant de puissance pour antenne double bande
FR8218803 1982-11-09

Publications (2)

Publication Number Publication Date
EP0108693A1 true EP0108693A1 (de) 1984-05-16
EP0108693B1 EP0108693B1 (de) 1988-01-27

Family

ID=9279039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83402150A Expired EP0108693B1 (de) 1982-11-09 1983-11-04 Hochleistungsdrehbare Verbindung für eine Doppelband-Antenne

Country Status (3)

Country Link
EP (1) EP0108693B1 (de)
DE (1) DE3375543D1 (de)
FR (1) FR2535904B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103326089A (zh) * 2013-07-02 2013-09-25 北京维创时通科技有限公司 超小型波导旋转关节

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523348A (en) * 1948-01-29 1950-09-26 Albert S White Radio frequency rotating joint for multiple feeds
US2835871A (en) * 1953-08-07 1958-05-20 Herbert P Raabe Two-channel rotary wave guide joint
FR2281660A1 (fr) * 1974-08-09 1976-03-05 Thomson Csf Dispositif muni d'une grille de filtrage
FR2429505A1 (fr) * 1978-06-20 1980-01-18 Thomson Csf Systeme d'alimentation periscopique pour antenne bi-gamme

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523348A (en) * 1948-01-29 1950-09-26 Albert S White Radio frequency rotating joint for multiple feeds
US2835871A (en) * 1953-08-07 1958-05-20 Herbert P Raabe Two-channel rotary wave guide joint
FR2281660A1 (fr) * 1974-08-09 1976-03-05 Thomson Csf Dispositif muni d'une grille de filtrage
FR2429505A1 (fr) * 1978-06-20 1980-01-18 Thomson Csf Systeme d'alimentation periscopique pour antenne bi-gamme

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AP-S INTERNATIONAL SYMPOSIUM 1977, Session 19, 22 juin 1977, San Francisco, IEEE, New York (US) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103326089A (zh) * 2013-07-02 2013-09-25 北京维创时通科技有限公司 超小型波导旋转关节

Also Published As

Publication number Publication date
DE3375543D1 (en) 1988-03-03
FR2535904B1 (fr) 1985-08-02
FR2535904A1 (fr) 1984-05-11
EP0108693B1 (de) 1988-01-27

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