EP0762529A1 - Iris-Polarisator für Antennenprimärstrahler - Google Patents

Iris-Polarisator für Antennenprimärstrahler Download PDF

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Publication number
EP0762529A1
EP0762529A1 EP96401830A EP96401830A EP0762529A1 EP 0762529 A1 EP0762529 A1 EP 0762529A1 EP 96401830 A EP96401830 A EP 96401830A EP 96401830 A EP96401830 A EP 96401830A EP 0762529 A1 EP0762529 A1 EP 0762529A1
Authority
EP
European Patent Office
Prior art keywords
polarizer
screws
irises
waveguide section
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
EP96401830A
Other languages
English (en)
French (fr)
Other versions
EP0762529B1 (de
Inventor
Jean-Yves Morineau
Serge Bazzani
Bernard Jamet
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 EP0762529A1 publication Critical patent/EP0762529A1/de
Application granted granted Critical
Publication of EP0762529B1 publication Critical patent/EP0762529B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
    • H01P1/173—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation using a conductive element

Definitions

  • the present invention relates to an iris polarizer for primary antenna source.
  • an antenna which can operate either in linear polarization or in circular polarization. This is particularly the case for antennas used in air traffic control.
  • a circular polarization more particularly makes it possible to overcome, to a large extent, disturbances due to rain.
  • An essential element of the antenna is then the polarizer used in the primary source, which makes it possible to switch from one polarization to the other while ensuring, in the case of circular polarization, a differential phase shift of substantially 90 ° between the components of the electric field.
  • the polarizer is of the iris type, that is to say that it includes, inside a waveguide section, a succession of regularly spaced reactive elements. These reactive elements are often conductive strips symmetrically penetrating into the waveguide section and located in transverse planes, that is to say perpendicular to the longitudinal axis.
  • these can have a capacitive or inductive susceptance.
  • the electric field When the electric field is at 45 ° with respect to the irises, it can be broken down into two orthogonal components equal in amplitude.
  • An optimized differential phase shift on an operating frequency band can be obtained by very precisely defining the parameters of the polarizer.
  • some of these are very difficult to define by calculation, which leads to successive embodiments of the polarizer for developing and optimizing it experimentally. This is of course long and costly.
  • the production methods being complex, it is difficult to hold the manufacturing tolerances during mass production resulting in performance degradation.
  • An object of the invention is therefore a polarizer free from these drawbacks thanks to a simple possibility of adjustment and adaptation to a given frequency band.
  • an iris polarizer for primary antenna source of the type including a waveguide section comprising a succession of regularly spaced reactive elements forming irises and acting as capacitive or inductive susceptances depending on the direction of the linear polarization of the electric field inside said waveguide section, characterized in that provision is made in said waveguide section for adjustable elements having a susceptance which is essentially of a given type, capacitive or inductive, so as to center the operating frequency band of said polarizer while maintaining the differential phase shift of said polarizer substantially equal to 90 ° in said frequency band.
  • Figure 1 schematically shows a known primary antenna source such as those mentioned above.
  • This source 1 comprises a transition 2 towards a waveguide section 3 of a polarizer.
  • the waveguide can be of section square, rectangular or circular.
  • the simplest solution that has been shown here is the circular section.
  • This waveguide section 3 comprises a succession of reactive elements 5 which are irises. It is often preferred to use irises although solutions with screws or quartz blades for example can be used.
  • the iris solution is more efficient, better suited to high powers and above all requires fewer elements than the other solutions with reactive elements because an iris can have both capacitive and inductive susceptances, hence greater simplicity.
  • An iris may consist of two conductive flaps penetrating inside the guide symmetrically with respect to the longitudinal axis of the guide and arranged in a transverse plane perpendicular to this axis.
  • the waveguide section 3 can be rotated by a geared motor assembly 4 (hence the advantage of a circular guide) so as to rotate it by 45 °.
  • Section 3 is followed by a transformer 6 then a phase shifter 7 connected to a horn 8.
  • Figures 2a and 2b show the equivalent diagram of an iris 5 for a square or circular guide according to the direction of polarization of the electric field.
  • the iris comprises two conductive flaps 51 and 52 in a plane transverse to the guide 3 and penetrating into the guide of a given height h.
  • the direction of the electric field (represented by an arrow) is perpendicular to the edges of the iris.
  • the susceptance B c is capacitive.
  • the susceptance B L is inductive.
  • the guide section 3 is rotated by 45 ° relative to the electric field having the direction of FIG. 2a or 2b, we can consider the incident wave as decomposable into two orthogonal components of the same amplitude, one of which is parallel at the edges of the iris and the other perpendicular to these same edges. If the polarizer imposes a differential phase shift of 90 ° on these two components, a wave with circular polarization is obtained at the output.
  • the dimensions of the guide (side d of a square guide for example) and the depression h of the irises must be defined.
  • a sinking law for the different irises is provided which can be a cosine law or according to a Tchebycher distribution and which makes it possible to minimize the TOS in the operating band.
  • FIG. 3 shows the variations of the capacitive (BC curve) and inductive (BL curve) susceptances of all the irises as a function of the frequency.
  • B cn is the capacitive susceptance
  • Yo the characteristic susceptance of the guide
  • ⁇ g the wavelength in the guide as a function of the dimensions of the guide and the frequency
  • K 1 (h n, d) a constant depending on the dimensions of the guide and iris depression.
  • the capacitive susceptance is inversely proportional to the wavelength in the guide.
  • B Ln Yo K 2 (( h not , d ) . ⁇ g (( d, f )
  • This value is proportional to the wavelength in the guide.
  • the first term depends on the size of the guide and the depth of the iris; the second term depends on the size of the guide and the frequency.
  • FIG. 6 represents the diagram of a polarizer according to the invention.
  • This polarizer comprises a waveguide section (3), circular in the example described, of diameter d determined approximately.
  • irises 5 are placed, the sinking h n of which is determined from d : the sinking h n of the irises obeys a law which can be a Tchebycher distribution to obtain the best possible TOS in the band. The whole is adjusted to also obtain a differential phase shift substantially equal to 90 °.
  • adjustable screws arranged in pairs 30, 31 symmetrical with respect to the longitudinal axis of symmetry 32, this in order to avoid the generation of higher modes.
  • the longitudinal spacing between two adjacent pairs is substantially equal to (2n + 1) ⁇ g / 4 for the center frequency of the operating band so as to obtain a good adaptation, this assuming that there are at least two pairs of screws .
  • the screws for example inside the guide, are arranged towards one end of the guide 3, where the irises are the least depressed, so as to guarantee the best power handling.
  • the screws have been arranged in the median plane P of the irises containing the axis 32, that is to say the plane of the figure for the longitudinal section.
  • the traces of the plane P and of the orthogonal plane P 'passing through the longitudinal axis 32 have been shown on the transverse section passing through the screws 30 of FIG. 6.
  • FIGS. 10 to 12 illustrate the case where the section of the waveguide 3 and therefore the dimension d are too large.
  • the solid lines correspond to the results in the absence of screws.
  • We end up here with a shift towards the low frequencies.
  • curves BC and BL of figure 10 a dispersion towards the high frequencies of the capacitive and inductive suceptances due to the irises and a weaker slope for the inductive susceptance.
  • the invention is in no way limited to the embodiments described.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Polarising Elements (AREA)
  • Waveguide Aerials (AREA)
EP19960401830 1995-09-01 1996-08-27 Iris-Polarisator für Antennenprimärstrahler Expired - Lifetime EP0762529B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510299A FR2738400B1 (fr) 1995-09-01 1995-09-01 Polariseur a iris pour source primaire d'antenne
FR9510299 1995-09-01

Publications (2)

Publication Number Publication Date
EP0762529A1 true EP0762529A1 (de) 1997-03-12
EP0762529B1 EP0762529B1 (de) 2001-03-14

Family

ID=9482209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960401830 Expired - Lifetime EP0762529B1 (de) 1995-09-01 1996-08-27 Iris-Polarisator für Antennenprimärstrahler

Country Status (3)

Country Link
EP (1) EP0762529B1 (de)
DE (1) DE69612052T2 (de)
FR (1) FR2738400B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065628A3 (en) * 2000-02-29 2002-11-21 Telecom Italia Lab Spa Waveguide polarizer
CN109661747A (zh) * 2016-09-06 2019-04-19 帕克-汉尼芬公司 偏振器组件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114502A (ja) * 1981-12-28 1983-07-07 Nippon Hoso Kyokai <Nhk> 偏波だ円制御装置
US4672334A (en) * 1984-09-27 1987-06-09 Andrew Corporation Dual-band circular polarizer
SU1596407A1 (ru) * 1988-04-25 1990-09-30 Предприятие П/Я А-3141 Волноводный пол ризатор

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114502A (ja) * 1981-12-28 1983-07-07 Nippon Hoso Kyokai <Nhk> 偏波だ円制御装置
US4672334A (en) * 1984-09-27 1987-06-09 Andrew Corporation Dual-band circular polarizer
SU1596407A1 (ru) * 1988-04-25 1990-09-30 Предприятие П/Я А-3141 Волноводный пол ризатор

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BORNEMANN ET AL.: "TE to x Mode analysis of corrugated waveguide circular polarizers", 1990 INTERNATIONAL SYMPOSIUM DIGEST ANTENNAS & PROPAGATION IEEE, vol. 1, 7 May 1990 (1990-05-07) - 11 May 1990 (1990-05-11), DALLAS,TEXAS, pages 492 - 495, XP002003898 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 222 (E - 201) 4 October 1983 (1983-10-04) *
SOVIET PATENTS ABSTRACTS Week 9134, 9 October 1991 Derwent World Patents Index; AN 91-250807, XP002003899 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065628A3 (en) * 2000-02-29 2002-11-21 Telecom Italia Lab Spa Waveguide polarizer
US6750735B1 (en) 2000-02-29 2004-06-15 Telecom Italia Lab S.P.A. Waveguide polarizer
CN109661747A (zh) * 2016-09-06 2019-04-19 帕克-汉尼芬公司 偏振器组件

Also Published As

Publication number Publication date
DE69612052T2 (de) 2001-09-20
DE69612052D1 (de) 2001-04-19
FR2738400B1 (fr) 1997-10-03
FR2738400A1 (fr) 1997-03-07
EP0762529B1 (de) 2001-03-14

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