EP0061965B1 - Antenne à dispositif de transposition de la direction de la polarisation linéaire - Google Patents

Antenne à dispositif de transposition de la direction de la polarisation linéaire Download PDF

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Publication number
EP0061965B1
EP0061965B1 EP82400514A EP82400514A EP0061965B1 EP 0061965 B1 EP0061965 B1 EP 0061965B1 EP 82400514 A EP82400514 A EP 82400514A EP 82400514 A EP82400514 A EP 82400514A EP 0061965 B1 EP0061965 B1 EP 0061965B1
Authority
EP
European Patent Office
Prior art keywords
antenna
guide
polarization
horn
primary source
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
Application number
EP82400514A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0061965A1 (fr
Inventor
Nhu Bui Hai
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
Priority to AT82400514T priority Critical patent/ATE28013T1/de
Publication of EP0061965A1 publication Critical patent/EP0061965A1/fr
Application granted granted Critical
Publication of EP0061965B1 publication Critical patent/EP0061965B1/fr
Expired legal-status Critical Current

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/245—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction provided with means for varying the polarisation 

Definitions

  • the present invention relates to an antenna intended to work in waves with linear polarization and comprising a horn (10) immobile in rotation about its axis of symmetry, and a device for transposing the direction of polarization of the linear waves passing through it.
  • the device for transposing the direction of polarization comprises a circular guide in which conductors are arranged transversely.
  • the device is capable of producing a choice of 45 ° and 0 ° transposition.
  • Adjustment towards the linear polarization received from an antenna by a receiver associated with the antenna is necessary in some cases.
  • the same vertical polarized wave emitted by a satellite is received with a direction of its polarity which makes, with the vertical, an angle which is a function, in particular, of the latitude and the longitude of the place where this wave is picked up.
  • an adjustment is necessary when an antenna changes satellite for the waves it receives. By virtue of the principle of reciprocity this also applies to transmission from, for example, earth stations.
  • Document GB-A-938 004 discloses a binomial twisted waveguiding device comprising several coaxial sections of rectangular waveguides whose transverse dimensions increase or decrease progressively and whose orientation angle relative to the first section gradually increases.
  • the object of the present invention is to provide an antenna equipped with a device for transposing the direction of polarization, which is both simple and inexpensive, usable as well for antennas with illumination of the focus as for antennas with optical Cassegrain. This object is achieved by an antenna as defined in the main claim.
  • FIG. 1 shows, schematically, antennas with illumination by the hearth according to the known art.
  • the antenna according to FIG. 1 comprises a reflector, P i , associated with a primary “V” source, S l , itself connected to a receiver, R i ; the rotation of the primary source around the main axis PP of the reflector requires mechanical means capable of rotating the horn and the receiver R 1 (or the transmitter in the case of operation in transmission); such an achievement is expensive, cumbersome and therefore practically never implemented.
  • the assembly constituted by the primary source S 2 and the receiver R 2 (or the transmitter in the case of operation in transmission) has its two ends, that is to say its horn and its receiver , combined with the main reflector axis, P 2 ; but if the rotation control of the primary source and the receiver is then easier than in the case of an antenna according to FIG. 1, on the other hand the performance of the antenna is lower due to the greater mask created by the source primary due to the presence of the swan neck in the central part of the radiation of the reflector P 2 .
  • FIG. 3 is a schematic view of an antenna with illumination of the focal point, equipped with a device for transposing the direction of the linear polarization of the waves received by reception means 8 associated with this antenna.
  • the antenna comprises a reflector 7 and a primary source; this primary source is constituted, in series, by a horn 10 followed by a guide in binomial twist 1,2,3,4 (step twist in North American literature), followed by a polarization duplexer 5 of which the two access V and H are connected to the receiving means 8 by rectangular guides shown diagrammatically in the figure by broken lines.
  • An attachment system 6 makes the primary source integral with the reflector 7.
  • This attachment system comprises four bars, such as the bars 46, 47 which appear in FIG. 3; these bars are welded, at their first end, to the reflector 7.
  • the fixing system 6 also includes a positioning assembly, 60 to 67, onto which the fixing bars are bolted, at their second end.
  • This sys fixing tem comprises two half-collars 60-61, integral with brackets such as 62-63 on which the fixing bars are bolted.
  • the fixing system is shown in section so as to leave a clear view of the primary source of the antenna.
  • FIG. 4 is a partial view of the fastening system 6 of Figure 1; this view is a sectional view through a plane perpendicular to the plane of Figure 3 and passing through the line ZZ of this figure.
  • FIG. 4 shows the two half-collars 60-61 and screw-nut assemblies, such as 66 and 67, which serve to bring the two half-collars closer together to securely hold the polarization duplexer 5 of FIG. 3.
  • brackets 62 to 65 of the fastening system 6 two of these brackets 62, 64 are welded to the half-collar 60 and the other two 63, 65 are welded to the half-collar 61.
  • FIG. 5 is a view of the binomial twisted guide 1, 2, 3, 4 through the opening of the horn 10 of FIG. 3.
  • the first step (step in the North American literature), 1 of this binomial twist guide is integral with the horn 10 of FIG. 3 and that its angular position around the main axis 00 (FIG. 3) of the binomial twist guide, is adjustable as well as that of the other three steps 2, 3 , 4 of this guide; a fixing assembly, which will appear in FIG. 6 and will be described with the aid of this figure, makes it possible to maintain the rungs in the position which is imparted to them by adjustment.
  • a vector P indicates the direction of the vertical polarization of a wave with two orthogonal polarizations, received by the horn 10 ( Figure 3) while a vector P s indicates the direction that this polarization must have when the wave arrives in the polarization duplexer 5 ( Figure 3) so that the receiving means 8 ( Figure 3) receive this wave with the maximum energy; these two vectors form an angle Y between them.
  • the binomial twisted guide is a guide with a square section; this square section allows the simultaneous transposition of the directions of the two field vectors of the received orthogonal polarization wave.
  • angle Y has been taken equal to 90 °, it being understood that Y can take all the values between 0 and 90 °.
  • the operating principle of the adjustable binomial twist guide is known. It is a junction, made of a series of waveguide sections, which is used to modify the angle of the electric field leaving this component with respect to the angle of the electric field entering this component; this modification is made in steps of a length L given by the distance, L (FIG. 3), between two transitions of this twisted guide, and this length L is chosen equal to is the guided wavelength of the average frequency of use of the twisted guide, or 11.7 GHz in the example described, and where K is the number of steps, or 4 in the present case.
  • This junction formed by the twisted guide introduces a reflection coefficient which is a function of the number K of the steps, the angle given to each step (X i ), the working frequency and the cut-off frequency of the guide.
  • FIG. 6 is a partial view of the antenna according to FIG. 3 at the level of the binomial twisted guide; in this figure appears an assembly which has not been shown in figure 3 for the sake of clarity.
  • This assembly comprises a crown 70, four stops, three of which 75, 76, 77 appear in FIG. 6, four screw-nut assemblies of which three, 71, 72 or 73 appear in FIG. 6 and a flange 50 integral with the guide waves which constitutes the access of the polarization duplexer 5.
  • the screw-nut assemblies such as 71, connect the crown 70 to the flange 50; without the screw-nut assemblies the crown 70 can rotate freely around the rung 1 of the guide in binomial twist, but cannot be removed because it is blocked on one side by the base of the horn 10 and on the other by the stops such as 75 which are screwed into the outer wall of rung 1.
  • the four sets of screw-nuts are first loosened, then the adjustment is carried out with using graduations and marks not shown in the figure, then the screw-nut assemblies are tightened.
  • the invention is not limited to the example described using FIGS. 3 to 6; thus, for example, the control of the angular position of the rungs can be carried out using motors. Furthermore, in the case where the received wave has only one rectilinear polarization, the polarization duplexer 5 of FIG. 3 does not have to be. Likewise, the binomial twist guide may include a number of steps other than four, for example 2, 3, 5, 6, etc.
  • the invention is not limited to the uti reading of the device in an antenna operating in reception since, due to the principle of the reversibility of electromagnetic waves, the device can also function well in transmission.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
EP82400514A 1981-03-31 1982-03-22 Antenne à dispositif de transposition de la direction de la polarisation linéaire Expired EP0061965B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400514T ATE28013T1 (de) 1981-03-31 1982-03-22 Antenne mit einem geraet zur steuerung der richtung der linearen polarisation.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8106431A FR2503462A1 (fr) 1981-03-31 1981-03-31 Antenne a dispositif de transposition de la direction de la polarisation lineaire
FR8106431 1981-03-31

Publications (2)

Publication Number Publication Date
EP0061965A1 EP0061965A1 (fr) 1982-10-06
EP0061965B1 true EP0061965B1 (fr) 1987-06-24

Family

ID=9256820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400514A Expired EP0061965B1 (fr) 1981-03-31 1982-03-22 Antenne à dispositif de transposition de la direction de la polarisation linéaire

Country Status (6)

Country Link
US (1) US4546359A (enrdf_load_stackoverflow)
EP (1) EP0061965B1 (enrdf_load_stackoverflow)
JP (1) JPS57176805A (enrdf_load_stackoverflow)
AT (1) ATE28013T1 (enrdf_load_stackoverflow)
DE (1) DE3276648D1 (enrdf_load_stackoverflow)
FR (1) FR2503462A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740651A1 (de) * 1987-12-01 1989-06-22 Messerschmitt Boelkow Blohm Vorrichtung zur einstellung der polarisationsebene
US5061037A (en) * 1990-10-22 1991-10-29 Hughes Aircraft Company Dual septum polarization rotator
US6297710B1 (en) 1999-09-02 2001-10-02 Channel Master Llc Slip joint polarizer
RU2225059C2 (ru) * 2002-05-13 2004-02-27 Сургутский государственный университет ХМАО Радиолокационный отражатель
JP4164807B2 (ja) * 2003-08-20 2008-10-15 太洋無線株式会社 スロットアレーアンテナ
US7212087B2 (en) * 2003-10-06 2007-05-01 Murata Manufacturing Co., Ltd. Twisted waveguide and wireless device
DE102007061571A1 (de) * 2007-12-18 2009-07-16 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB820324A (en) * 1956-06-05 1959-09-16 British Thomson Houston Co Ltd Improvements in and relating to waveguides
DE1024590B (de) * 1957-07-24 1958-02-20 Telefunken Gmbh Hohlleiterabschnitt mit einstellbarer Querschnitts-Verdrehung um die Laengsachse
US2996714A (en) * 1957-12-26 1961-08-15 Edward F Harris Dish radiator of adjustable polarization
US3076188A (en) * 1958-06-04 1963-01-29 Decca Ltd Adjustable polarization waveguide for radar
DE1117669B (de) * 1960-06-20 1961-11-23 Siemens Ag Rotationsparabol-Antenne
GB938004A (en) * 1960-11-17 1963-09-25 Marconi Wireless Telegraph Co Improvements in or relating to waveguide transformers
US3541560A (en) * 1968-06-24 1970-11-17 Itt Enhancement of polarization isolation in a dual polarized antenna
BE792731A (fr) * 1972-09-13 1973-03-30 Elettronica Aster Srl Joint tournant a gradins pour guide d'ondes
JPS5434738A (en) * 1977-08-24 1979-03-14 Yagi Antenna Device for switching antenna polarization plane
JPS5947881B2 (ja) * 1977-12-12 1984-11-22 日本電信電話株式会社 可変電力分配器
DE2800266C2 (de) * 1978-01-04 1986-02-13 ANT Nachrichtentechnik GmbH, 7150 Backnang Kompensations-Anordnung für zwei miteinander axial fluchtende und einander stoßende Rechteck-Hohlleiter gleichen Querschnitts
US4375052A (en) * 1980-07-11 1983-02-22 Microdyne Corporation Polarization rotatable antenna feed

Also Published As

Publication number Publication date
EP0061965A1 (fr) 1982-10-06
DE3276648D1 (en) 1987-07-30
FR2503462B1 (enrdf_load_stackoverflow) 1985-05-03
US4546359A (en) 1985-10-08
FR2503462A1 (fr) 1982-10-08
ATE28013T1 (de) 1987-07-15
JPS57176805A (en) 1982-10-30

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