EP0762529B1 - Polariseur à iris pour source primaire d'antenne - Google Patents
Polariseur à iris pour source primaire d'antenne Download PDFInfo
- Publication number
- EP0762529B1 EP0762529B1 EP19960401830 EP96401830A EP0762529B1 EP 0762529 B1 EP0762529 B1 EP 0762529B1 EP 19960401830 EP19960401830 EP 19960401830 EP 96401830 A EP96401830 A EP 96401830A EP 0762529 B1 EP0762529 B1 EP 0762529B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide section
- polariser
- screws
- irises
- frequency band
- 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
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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.
- the polarizer is of the iris type, that is to say that it has inside a waveguide section a succession of regularly reactive elements spaced. These reactive elements are often conductive strips symmetrically entering the waveguide section and located in transverse planes, that is to say perpendicular to the longitudinal axis.
- An object of the invention is therefore a polarizer free of these disadvantages thanks to a simple possibility of adjustment and adaptation to a given frequency band.
- an iris polarizer for source antenna primary of the type including a waveguide section longitudinal with a succession of regularly reactive elements spaced apart forming irises and acting as capacitive susceptances or inductive according to the direction of the linear polarization of the field electric inside said waveguide section, as defined in the revendications.
- Figure 1 schematically represents a primary source known antenna such as those mentioned above.
- This source 1 includes a transition 2 to a section of waveguide 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. We prefer often use irises although screw solutions or quartz blades by example can be used.
- the iris solution is more efficient, better suited to large powers and above all requires fewer elements than the other reactive element solutions because an iris can have both capacitive and inductive susceptibility, hence a greater simplicity.
- An iris may consist of two conductive flaps penetrating at inside the guide symmetrically 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) of so that it rotates 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 depending on the polarization direction of the field electric.
- the iris comprises two conducting flaps 51 and 52 in a plane transverse to guide 3 and entering the guide of a given height h.
- susceptance B VS is capacitive.
- the susceptance B L is inductive.
- guide section 3 is rotated 45 ° by compared to the electric field having the direction of figure 2a or 2b, one can consider the incident wave as decomposable into two components orthogonal of the same amplitude, one of which is parallel to the edges of the iris and the other perpendicular to these same edges. If the polarizer requires these two components a 90 ° differential phase shift, we obtain at output a wave with circular polarization.
- the dimensions of the guide (side d of a square guide for example) and sinking h of the irises are provided.
- a sinking law for the different irises which can be a law in cosine or according to a distribution of Tchebychev and which allows to minimize the TOS in the operating band.
- Figure 3 shows the variations in capacitive susceptances (BC curve) and inductive (BL curve) of all the irises as a function of the frequency.
- the capacitive susceptance is inversely proportional to the wavelength in the guide.
- 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 whose sinking h n is determined from d : the sinking h n of the irises obeys a law which can be a Chebyshev 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 °.
- the screws for example inside the guide are arranged towards one end of the guide 3, where the irises are the least depressed, so 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 plane P and the orthogonal plane P 'passing through the longitudinal axis 32 have been shown on the cross 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 FIG. 10 a dispersion towards the high frequencies of the capacitive and inductive suceptances due to the irises and a lower slope for the inductive susceptance.
- the invention is in no way limited to the examples of realization described.
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Polarising Elements (AREA)
- Waveguide Aerials (AREA)
Description
- la figure 1 est le schéma d'une source primaire d'antenne connue avec un polariseur à iris ;
- les figures 2a et 2b représentent des diagrammes explicatifs ;
- les figures 3 à 5 sont des courbes relatives à un polariseur à iris optimisé ;
- la figure 6 est un schéma en coupe longitudinale et transversale d'un polariseur selon l'invention ;
- les figures 7 à 9 sont des courbes relatives au polariseur de la figure 6 lorsque le guide d'ondes a une section trop faible ; et
- les figures 10 à 12 sont des courbes relatives au polariseur de la figure 6 lorsque le guide d'ondes a une section trop grande.
Claims (7)
- Polariseur à iris pour source primaire d'antenne du type incluant une section de guide d'ondes (3) longitudinale comportant une succession d'éléments réactifs (5) régulièrement espacés formant des iris et agissant comme des susceptances capacitives ou inductives selon la direction de la polarisation linéaire du champ électrique à l'intérieur de ladite section de guide d'ondes, caractérisé en ce qu'il est prévu de disposer dans ladite section de guide d'ondes, en complément desdits iris, des éléments ajustables (30, 31) présentant une susceptance qui est essentiellement d'un type donné, capacitif ou inductif, de manière à recentrer la bande de fréquence de fonctionnement dudit polariseur tout en maintenant le déphasage différentiel dudit polariseur sensiblement égal à 90° dans ladite bande de fréquence, de manière à minimiser le taux d'ellipticité de l'onde à la sortie du polariseur.
- Polariseur selon la revendication 1, caractérisé en ce que lesdits éléments ajustables sont constitués par des vis ou des barreaux dont la profondeur de pénétration dans la section de guide (3) est réglable.
- Polariseur selon la revendication 2, dans lequel lesdits éléments réactifs (5) sont constitués chacun par deux volets conducteurs pénétrant symétriquement d'une hauteur donnée (hn) à l'intérieur de la section de guide (3) dans un plan transversal à la section de guide longitudinale, caractérisé en ce que lesdits éléments ajustables sont constitués par au moins deux paires de vis (30, 31) réglables en hauteur, les vis de chaque paire étant disposées symétriquement par rapport à l'axe de symétrie longitudinal (32) de la section de guide d'ondes (3) et la distance entre les deux paires suivant ledit axe étant sensiblement égale à un multiple impair du quart de la longueur d'onde dans la section de guide à la fréquence centrale de ladite bande de fréquence de fonctionnement.
- Polariseur selon la revendication 3, caractérisé en ce que la tête des vis (30, 31) à l'intérieur de la section de guide est de forme sphérique.
- Polariseur selon l'une des revendications 3 ou 4, caractérisé en ce que la dimension transversale (d) de la section de guide d'ondes (3) dans le plan médian (P) des iris contenant ledit axe de symétrie (32) étant inférieure à la dimension optimale pour la bande de fréquence de fonctionnement désirée,|dimension optimale qui rend égal le taux d'ellipticité obtenu aux deux extrémités de ladite bande de fréquence, lesdites vis (30, 31) sont disposées dans ledit plan médian.
- Polariseur selon l'une des revendications 3 ou 4, caractérisé en ce que, la dimension transversale (d) de la section de guide d'ondes (3) dans le plan médian des iris contenant ledit axe de symétrie étant supérieure à la dimension optimale pour la bande de fonctionnement désirée, dimension optimale qui rend égal le taux d'ellipticité obtenu aux deux extrémités de ladite bande de fréquence, lesdites vis (30, 31) sont disposées dans le plan (P') contenant ledit axe de symétrie et orthogonal audit plan médian (P).
- Polariseur selon l'une des revendications 1 à 6, caractérisé en ce que lesdits éléments ajustables (30, 31) sont disposés vers une des extrémités de ladite section de guide d'ondes (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9510299 | 1995-09-01 | ||
| FR9510299A FR2738400B1 (fr) | 1995-09-01 | 1995-09-01 | Polariseur a iris pour source primaire d'antenne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0762529A1 EP0762529A1 (fr) | 1997-03-12 |
| EP0762529B1 true EP0762529B1 (fr) | 2001-03-14 |
Family
ID=9482209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19960401830 Expired - Lifetime EP0762529B1 (fr) | 1995-09-01 | 1996-08-27 | Polariseur à iris pour source primaire d'antenne |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0762529B1 (fr) |
| DE (1) | DE69612052T2 (fr) |
| FR (1) | FR2738400B1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1319925B1 (it) * | 2000-02-29 | 2003-11-12 | Cselt Centro Studi Lab Telecom | Polarizzazione in guida d'onda. |
| JP2019530307A (ja) * | 2016-09-06 | 2019-10-17 | パーカー・ハニフィン・コーポレーション | 偏波器組立体 |
Family Cites Families (3)
| 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 |
-
1995
- 1995-09-01 FR FR9510299A patent/FR2738400B1/fr not_active Expired - Fee Related
-
1996
- 1996-08-27 DE DE1996612052 patent/DE69612052T2/de not_active Expired - Fee Related
- 1996-08-27 EP EP19960401830 patent/EP0762529B1/fr not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2738400B1 (fr) | 1997-10-03 |
| FR2738400A1 (fr) | 1997-03-07 |
| DE69612052T2 (de) | 2001-09-20 |
| DE69612052D1 (de) | 2001-04-19 |
| EP0762529A1 (fr) | 1997-03-12 |
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