EP0174250B1 - Device for receiving dual polarized microwave signals - Google Patents

Device for receiving dual polarized microwave signals Download PDF

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Publication number
EP0174250B1
EP0174250B1 EP85401680A EP85401680A EP0174250B1 EP 0174250 B1 EP0174250 B1 EP 0174250B1 EP 85401680 A EP85401680 A EP 85401680A EP 85401680 A EP85401680 A EP 85401680A EP 0174250 B1 EP0174250 B1 EP 0174250B1
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EP
European Patent Office
Prior art keywords
waveguide
substrate
probe
tube
slots
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EP85401680A
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German (de)
French (fr)
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EP0174250A1 (en
Inventor
Zaroche Houchangnia
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Societe dElectronique de la Region Pays de Loire
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Societe dElectronique de la Region Pays de Loire
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Priority to AT85401680T priority Critical patent/ATE59248T1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/001—Crossed polarisation dual antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
    • 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
    • H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
    • H01Q13/0258—Orthomode horns

Definitions

  • the invention relates to a device for receiving microwave signals with double polarization, consisting of simple elements which allow rapid and easy mounting without subsequent adjustments, and which confer sufficient overall rigidity.
  • This device is more particularly intended for the reception of microwave signals with double polarization transmitted for television, for example from geostationary satellites. It is intended to be used in reception stations, in combination with the active elements fitted to the microwave heads of said stations.
  • the device can be used for the reception of all microwave signals with double polarization, by adapting some of its elements to the frequency range for which it is intended.
  • a signal or even a wave is said to have double polarization when it does not propagate on a plane, as is the case for a signal with rectilinear polarization (also called plane wave), but around an axis determining the direction. signal propagation. This is the case for waves with circular polarization, or even waves with elliptical polarization.
  • a double polarization wave can be considered as the superposition of two waves with rectilinear polarization.
  • the polarization is circular when the amplitude of the field vector (electric or magnetic) resulting from the superposition of the two waves is constant around the axis of propagation: more precisely, the end of the field vector describes a circle around the axis , in projection on a plane perpendicular to this axis.
  • a wave with circular polarization is the result of two plane waves, orthogonal to each other, and whose maximum amplitudes and frequencies are equal, but between which there is a phase shift of 90 °.
  • the polarization is said to be elliptical when the amplitude of the field vector varies around the axis of propagation. Its end describes an ellipse, projected onto a plane perpendicular to the axis.
  • An elliptically polarized wave is the result of two plane waves, orthogonal, whose maximum amplitudes are different.
  • Circular polarization is mainly used in satellite tracking installations or in space communication installations. The consequences of the Faraday effect which exists in the ionosphere are then lessened, and the reception is better. Circular polarization is also used in terrestrial radars, in order to limit parasitic echoes due to clouds.
  • a device for receiving waves or microwave signals with double polarization must include means for ensuring the reception and processing of two microwave signals with rectilinear polarization.
  • the signal is picked up using a probe which feeds the input of a microwave head.
  • the microwave heads include a preamplifier stage connected to the probe, in order to amplify the signal received in the centimeter wave band.
  • a heterodyne converter consisting of a local oscillator and a mixer, allows the frequency of the signal received by the probe to be transposed to a lower frequency, for example in the HF band; then, an amplifier acts on the signal transposed before its exploitation.
  • These various constituents include elements in microstrips distributed over dielectric substrates of greater or lesser thickness depending on whether they are associated with the decimetric wave circuit or the centimeter wave circuit. Conductive sections are produced by metallization on these substrates and their width varies according to the frequency band for which they are intended.
  • the probe to pick up the signal is, in these different circuits, produced using a metallization placed on one of the substrates, and is located inside a waveguide connected to the antenna. reception.
  • the probes must be arranged to receive signals orthogonal to each other. Then the circuits supplying the microwave heads must not interfere.
  • a device of the type described in European Patent Application EP-A-0 073 511 makes it possible to solve these two problems.
  • the present invention also allows the assembly to be rapid, does not require any subsequent adjustments and has sufficient rigidity.
  • a tube placed between the first and second substrates and having at each end positioning means cooperating with complementary positioning means located on the substrates so as to ensure orthogonality between the two probes, the internal section of said tube being equal to the external section of the second waveguide and said decoupling and adaptation means being integral with said second waveguide fitted inside said tube.
  • the ends of the tube have identical tongues and offset by 90 ° from one end to the other and the substrates on which the probes are placed have slots complementary to the tongues having the same relative locations with respect to to the probes.
  • the device for receiving double polarization waves comprises, as shown in FIG. 1, a reception antenna of the "Cassegrain" type consisting of a paraboloid reflector 1, at the focus of which is a hyperboloid reflector 2 which returns the waves electromagnetic to a receiving horn 3 associated with a waveguide 4 whose role is to direct the waves towards the active elements of the high-frequency circuits which are at the end of the waveguide opposite the antenna.
  • a reception antenna of the "Cassegrain" type consisting of a paraboloid reflector 1, at the focus of which is a hyperboloid reflector 2 which returns the waves electromagnetic to a receiving horn 3 associated with a waveguide 4 whose role is to direct the waves towards the active elements of the high-frequency circuits which are at the end of the waveguide opposite the antenna.
  • the circular polarization wave is decomposed into two plane waves, in known manner, using a depolarizer located at the outlet of the reception horn 3, in the wave guide 4.
  • This depolarizer not shown in the figures, is in dielectric or metal strip.
  • the two waves thus obtained are orthogonal to each other and continue their propagation inside the waveguide 4.
  • the device of which FIG. 2 shows, in exploded view, the constituent elements allows the reception of these two orthogonal waves.
  • the waveguide 4 is in the form of a cylinder open at its two ends. One end is connected to the outlet of the reception horn 3 of FIG. 1. At the other end, intended to be near the reception circuits, there is a recess 41 for the passage of the electrical connection between a probe 51 and the microwave head (not shown) associated therewith.
  • the device also comprises a first set 5 of microwave circuits in microstrips on which the first probe 51 is located for the reception of one of the two waves resulting from the decomposition of the double polarization signal by the depolarizer.
  • this assembly is assembled according to the technology protected by French Patent no. 2,522,885 to the plaintiff.
  • SM 5 intended for the centimeter wave band
  • SE 5 intended for the decimeter wave band
  • the probe 51 intended for reception is produced by metallization of the face of the thin substrate SM 5 not facing the thick substrate SE 5.
  • This probe 51 has an almost triangular shape (axial section of a "core"), the top of which is substantially in the center of a circle, delimited on the assembly of substrates by slots F 52 , F s3 , F 14 in the shape of arcs. These slots pass through the two substrates SM 5 and SE 5 right through.
  • a metallization is located between the two substrates and serves as a ground plane.
  • the thin substrate SM 5 is intended to be located opposite the end of the waveguide 4 which carries the recess 41.
  • This guide 6 also has the same external diameter as the guide 4 connected to the horn.
  • a tube 7 has an internal diameter equal to the external diameter of the guide 6, so that the latter can be fitted inside.
  • the end of the tube 7 intended to be opposite the thick substrate of the assembly 5 has extensions in the form of tongues L 52 , L 53 , L 54 complementary to the slots F 52 , F 53 , F 54 which pass through the two substrates SM 5 and SE 5, so that these tongues can be engaged in the slots, and so that the tube 7 is made integral with the assembly 5.
  • the other end of the tube 7 is also terminated by tabs L 82 , L 83 , L 84 , similar to those of the other end, but offset by 90 ° relative to the latter.
  • the length of the tube 7, without the tabs of each end is equal to the length of the guide 6.
  • a recess 71 is formed between two tabs L 82 and L 83 , so as to be opposite the recess 62 of the guide 6 when that is in place, to allow the passage of an electrical connection between a second probe and a high-frequency head.
  • Two slots, of which only one 72 is visible, are formed in the wall of the tube 7, parallel to its longitudinal axis to allow the metal blade 61 to be placed in the slots 63 of the guide 6.
  • the slots 63 of the guide 6 and 72 of the tube 7 are placed so that the adapter blade 61 of the probe 51 is parallel to the longitudinal axis of this probe when the tabs L 52 , L 53 , L 54 of the tube 7 are in place in the slots F 52 , F 53 , F 54 of the assembly 5 carrying this probe 51.
  • the tongues of the tube 7 and the slots of the corresponding assembly 5 are arranged so that only one positioning of this assembly is possible.
  • a second assembly 8 comprising elements in microstrips is identical to the first and comprises a probe 81 and three slots F 82 , F 83 , F 84 intended to cooperate with the tongues L s2 , L s3 , L 84 of the other end of the tube 8.
  • the guide transition serving as probe 81 is produced using a quasi-triangular metallization formed on the thin substrate SM 8 of the second set 8. This probe is connected to the amplifier stage of the high-frequency head by a connection in microstrips passing through the recesses 71 of the tube 7, and 62 of the guide 6.
  • a thick SE 8 substrate also makes up this set 8 of microstrips, according to the technology described in French Patent no. 2,522,885 already cited.
  • Slots F 82 , F 83 , F 84 are made in the thickness of the two substrates, identical to the slots F S2 , F 53 , F 14 of the first set of circuits, and are intended to cooperate with the tongues L 82 , L 83 , L 84 of tube 7.
  • a cylindrical cup 9, closed by a short-circuit bottom, has an internal diameter equal to the internal diameter of the guide 6 and an external diameter equal to the internal diameter of the tube 7.
  • This cup is designed to be fitted into the tongues L 82 , L 83 , L 84 when the tube 7 is in place on the set 8 of microstrip circuits.
  • Figures 3 and 4 show, in a section passing through the longitudinal axis of the probe 51, the device when the constituent elements are in place.
  • the waveguide 4 intended to be connected to the antenna is in contact with the thin substrate SM 5 of the first set 5 of microwave circuits in microstrips.
  • the recess 41 allows the passage of the probe 51 and its electrical connection with the microwave head with which it is associated.
  • the second guide 6 is placed between the two sets 5 and 8 of microstrip circuits. By its presence, it allows the substrates SM 5, SE 5, SM 8, SE 8 and consequently the probes 51 and 81 which it carries respectively to be on perfectly parallel planes, while being perpendicular to the longitudinal axis of the guides. This is made possible because the ends of the guides are in cross section.
  • the tube 7 thanks to the tongues engaged in the slots of the assemblies 5 and 8 of microstrip circuits allows the probes to be orthogonal to each other, because the tongues are similar from one end to the other but offset by 90 °, and because the sets 5 and 8 of microstrip circuits are identical, and in particular have their slots placed in the same places with respect to the probes.
  • the metal blade 61 is welded, after having been put in place, both in the slots 63 and 72 of the guide 6 and of the tube 7. It is placed parallel to the longitudinal axis of the probe 51 and thus reflects all the waves which are parallel to it. Therefore, the probe 51 is adapted.
  • the distance between the two probes is equal to a guided wavelength.
  • the middle of the metal plate 61 must be located at a distance from the probe 51 equal to a quarter of the guided wavelength.
  • this metal strip returns to the probe 51 the component of the field which is parallel to it, which allows the adaptation of the probe 51 and the establishment of a good decoupling between the two accesses.
  • the termination cup 9 is held on the assembly in a manner similar to the waveguide 4: the tabs L 82 , L 83 , L 84 passing through the slots of the second set 8 of circuits allow this holding.
  • the bottom of this cup is kept parallel to the set 8 of circuits, at a distance from the probe 81 slightly less than a quarter of the guided wavelength. This short-circuit bottom allows the adaptation of the second probe 81.
  • This metal blade 91 is held in the guide 9 bis thanks to diametrically slits opposite and parallel to the longitudinal axis of this guide, as was the case for the metal blade 61 of the guide 6 and of the tube 8.
  • Decoupling can also be improved by placing a resistive strip between the first metal strip 61 and the second probe 81 parallel to the strip 61. This strip will absorb the residue of the component of the field parallel to the first probe 51 which will not have been reflected by the metal plate 61 and which will not have been picked up by the first probe 51.
  • This blade is essential when the decoupling between the two ports must be greater than the values required by the criteria for reception of satellite television programs.
  • FIG. 5 represents a partial view, on the thin substrate side SM 5, of the first set 5 of circuits in microstrips.
  • the second set 8 of microstrip circuits also has the structure shown in this FIG. 5.
  • An annular metallization 10 has an external diameter equal to the internal diameter of the slots and an internal diameter equal to that of the waveguide 4. This metallization is carried out on the thin substrate SM 5 and is connected by a mass transfer rivet R to the ground plane which, as we recall, is located between the two substrates SM 5 and SE 5.
  • the probe Si is connected via a link 11 in microstrips to the rest of the circuits making up the microwave head 12.
  • This metallization allows, when the device is fully assembled, that the waveguide 4 is connected to ground.
  • the similar metallization on the thin substrate SM 8 of the second set of microstrip circuits allows the contact of the waveguide 6 located between the two sets of microstrip circuits with the ground plane between the thin substrates SM 8 and thick SE 8 of the second set of circuits.
  • electrical contact with the ground is ensured by producing a weld bead between the guide 4 and the metallization 10 of the first set of circuits or between the guide 6 and the corresponding metallization of the second set of circuits.
  • weld points are provided between the waveguide 4 and the tongues L 52 , L 53 , L 54 and between the cup 9 or the guide 9 bis and the tabs L 82 , L 83 , L 84 of the tube 7.

Abstract

A device for receiving dual polarized microwave signals, including a first waveguide connected to a receiving antenna and to a first substrate bearing a first sensor perpendicular to the longitudinal axis of the first waveguide, a second waveguide having the same longitudinal axis and the same dimensions as the first waveguide, and which is connected to a second substrate having a second sensor perpendicular to the longitudinal axis of the second waveguide. Surrounding the second waveguide is a tube having tongues at opposed ends which cooperate with slots formed in the first and second substrates. The opposed tongues of the tube are staggered by 90 DEG so that upon insertion of the opposed tongues of the tube within the slots of the first and second substrates, sensors formed on these substrates are arranged orthogonally with respect to one another. The tongues and cooperating slots assure mechanical integrity. A metallic blade is mounted in axially extending diametrically opposed slots formed in the second waveguide in the tube to maximize decoupling between the dual polarized signals being received.

Description

L'invention est relative à un dispositif de réception de signaux hyperfréquences à double polarisation, constitué d'éléments simples qui permettent un montage rapide et aisé sans réglages ultérieurs, et qui confèrent une rigidité d'ensemble suffisante.The invention relates to a device for receiving microwave signals with double polarization, consisting of simple elements which allow rapid and easy mounting without subsequent adjustments, and which confer sufficient overall rigidity.

Ce dispositif est plus particulièrement destiné à la réception des signaux hyperfréquences à double polarisation émis pour la télévision, par exemple à partir de satellites géostationnaires. Il est destiné à être utilisé dans les stations de réception, en association avec les éléments actifs équipant les têtes hyperfréquences desdites stations.This device is more particularly intended for the reception of microwave signals with double polarization transmitted for television, for example from geostationary satellites. It is intended to be used in reception stations, in combination with the active elements fitted to the microwave heads of said stations.

Plus généralement, le dispositif peut être utilisé pour la réception de tous les signaux hyperfréquences à double polarisation, en adaptant certains de ses éléments à la gamme de fréquence à laquelle il est destiné.More generally, the device can be used for the reception of all microwave signals with double polarization, by adapting some of its elements to the frequency range for which it is intended.

Un signal ou bien encore une onde est dit à double polarisation lorsqu'il ne propage par sur un plan, comme c'est le cas pour un signal à polarisation rectiligne (encore appelé onde plane), mais autour d'un axe déterminant la direction de propagation du signal. C'est le cas des ondes à polarisation circulaire, ou bien encore des ondes à polarisation elliptique.A signal or even a wave is said to have double polarization when it does not propagate on a plane, as is the case for a signal with rectilinear polarization (also called plane wave), but around an axis determining the direction. signal propagation. This is the case for waves with circular polarization, or even waves with elliptical polarization.

Une onde à double polarisation peut être considérée comme la superposition de deux ondes à polarisation rectiligne.A double polarization wave can be considered as the superposition of two waves with rectilinear polarization.

La polarisation est circulaire lorsque l'amplitude du vecteur champ (électrique ou magnétique) résultant de la superposition des deux ondes est constante autour de l'axe de propagation: plus précisément, l'extrémité du vecteur champ décrit un cercle autour de l'axe, en projection sur un plan perpendiculaire à cet axe.The polarization is circular when the amplitude of the field vector (electric or magnetic) resulting from the superposition of the two waves is constant around the axis of propagation: more precisely, the end of the field vector describes a circle around the axis , in projection on a plane perpendicular to this axis.

Une onde à polarisation circulaire est la résultante de deux ondes planes, orthogonales entre elles, et dont les amplitudes maximum ainsi que les fréquences sont égales, mais entre lesquelles existe un déphasage de 90°.A wave with circular polarization is the result of two plane waves, orthogonal to each other, and whose maximum amplitudes and frequencies are equal, but between which there is a phase shift of 90 °.

La polarisation est dite elliptique lorsque l'amplitude du vecteur champ varie autour de l'axe de propagation. Son extrémité décrit une ellipse, en projection sur un plan perpendiculaire à l'axe.The polarization is said to be elliptical when the amplitude of the field vector varies around the axis of propagation. Its end describes an ellipse, projected onto a plane perpendicular to the axis.

Une onde à polarisation elliptique est la résultante de deux ondes planes, orthogonales, dont les amplitudes maximum sont différentes.An elliptically polarized wave is the result of two plane waves, orthogonal, whose maximum amplitudes are different.

La polarisation circulaire est principalement utilisée dans les installations de poursuite de satellites ou dans les installations de communication spatiale. Les conséquences de l'effet Faraday qui existe dans l'ionosphère sont alors amoindries, et la réception est meilleure. La polarisation circulaire est également utilisée dans les radars terrestres, afin de limiter les échos parasites dûs aux nuages.Circular polarization is mainly used in satellite tracking installations or in space communication installations. The consequences of the Faraday effect which exists in the ionosphere are then lessened, and the reception is better. Circular polarization is also used in terrestrial radars, in order to limit parasitic echoes due to clouds.

Afin d'exploiter à la réception une onde émise en double polarisation, il est connu de décomposer cette onde en deux ondes planes, puis d'analyser chacune des composantes obtenues.In order to exploit on reception a wave transmitted in double polarization, it is known to decompose this wave into two plane waves, then to analyze each of the components obtained.

Il s'ensuit qu'un dispositif pour la réception d'ondes ou de signaux hyperfréquences à double polarisation doit comporter des moyens pour assurer la réception et le traitement de deux signaux hyperfréquences à polarisation rectiligne.It follows that a device for receiving waves or microwave signals with double polarization must include means for ensuring the reception and processing of two microwave signals with rectilinear polarization.

Dans les dispositifs connus de réception de signaux hyperfréquences à polarisation rectiligne, le signal est capté à l'aide d'une sonde qui alimente l'entrée d'une tête hyperfréquence.In known devices for receiving microwave signals with rectilinear polarization, the signal is picked up using a probe which feeds the input of a microwave head.

Les têtes hyperfréquences comprennent un étage préamplificateur relié à la sonde, afin d'amplifier le signal reçu dans la bande des ondes centimétriques. Un convertisseur hétérodyne, constitué d'un oscillateur local et d'un mélangeur, permet de transposer la fréquence du signal reçu par la sonde vers une fréquence inférieure, par exemple dans la bande des ondes décimétriques; ensuite, un amplificateur agit sur le signal transposé avant son exploitation.The microwave heads include a preamplifier stage connected to the probe, in order to amplify the signal received in the centimeter wave band. A heterodyne converter, consisting of a local oscillator and a mixer, allows the frequency of the signal received by the probe to be transposed to a lower frequency, for example in the HF band; then, an amplifier acts on the signal transposed before its exploitation.

Ces divers constituants comprennent des éléments en microbandes répartis sur des substrats diélectriques d'épaisseur plus ou moins importante selon qu'ils sont associés au circuit des ondes décimétriques ou au circuit des ondes centimétriques. Des tronçons conducteurs sont réalisés par métallisation sur ces substrats et leur largeur varie selon la bande de fréquence à laquelle ils sont destinés.These various constituents include elements in microstrips distributed over dielectric substrates of greater or lesser thickness depending on whether they are associated with the decimetric wave circuit or the centimeter wave circuit. Conductive sections are produced by metallization on these substrates and their width varies according to the frequency band for which they are intended.

La sonde pour capter le signal est, dans ces différents circuits, réalisée à l'aide d'une métallisation placée sur l'un des substrats, et se trouve à l'intérieur d'un guide d'ondes relié à l'antenne de réception.The probe to pick up the signal is, in these different circuits, produced using a metallization placed on one of the substrates, and is located inside a waveguide connected to the antenna. reception.

La réalisation d'un dispositif de réception de signaux hyperfréquences à double polarisation présente des inconvénients car ce dispositif doit posséder deux sondes et deux ensembles de substrats.The production of a device for receiving microwave signals with double polarization has drawbacks because this device must have two probes and two sets of substrates.

Il faut tout d'abord que les sondes soient agencées pour recevoir des signaux orthogonaux entre eux. Il faut ensuite que les circuits alimentant les têtes hyperfréquences n'interfèrent pas. Un dispositif du type décrit dans la Demande de Brevet Européen EP-A-0 073 511 permet de résoudre ces deux problèmes. Mais la présente invention permet, en outre, que le montage soit rapide, ne nécessite pas de réglages ultérieurs et ait une rigidité suffisante.First of all, the probes must be arranged to receive signals orthogonal to each other. Then the circuits supplying the microwave heads must not interfere. A device of the type described in European Patent Application EP-A-0 073 511 makes it possible to solve these two problems. However, the present invention also allows the assembly to be rapid, does not require any subsequent adjustments and has sufficient rigidity.

L'invention concerne donc un dispositif du type décrit dans la Demande EP-A-0 073 511, c'est-à-dire un dispositif pour la réception d'un signal hyperfréquence à double polarisation fourni par une antenne et décomposé en deux composantes orthogonales à polarisation rectiligne par un dépolariseur connecté à ladite antenne, ledit dispositif comportant:

  • a) un premier guide d'onde dont l'entrée est connectée à la sortie dudit dépolariseur,
  • b) une première sonde placée à la sortie du premier guide d'onde et comprenant un premier substrat diélectrique et une première. métallisation réalisée sur un côté du premier substrat, ledit substrat étant perpendiculaire à l'axe longitudinal du premier guide d'onde,
  • c) un deuxième guide d'onde dont l'entrée est placée de l'autre côté dudit premier substrat, ledit deuxième guide ayant le même axe longitudinal que le premier guide,
  • d) une deuxième sonde placée à la sortie du deuxième guide d'onde et comprenant un deuxième substrat diélectrique et une deuxième métallisation réalisée sur un côté du deuxième substrat, ledit substrat étant perpendiculaire à l'axe longitudinal du deuxième guide,
  • e) des moyens pour assurer le découplage et l'adaptation desdites sondes.
The invention therefore relates to a device of the type described in Application EP-A-0 073 511, that is to say a device for the reception of a microwave signal with double polarization supplied by an antenna and broken down into two components orthogonal to rectilinear polarization by a depolarizer connected to said antenna, said device comprising:
  • a) a first waveguide whose input is connected to the output of said depolarizer,
  • b) a first probe placed at the outlet of the first waveguide and comprising a first dielectric substrate and a first. metallization carried out on one side of the first substrate, said substrate being perpendicular to the longitudinal axis of the first waveguide,
  • c) a second waveguide whose input is placed on the other side of said first substrate, said second guide having the same longitudinal axis as the first guide,
  • d) a second probe placed at the outlet of the second waveguide and comprising a second dielectric substrate and a second metallization produced on one side of the second substrate, said substrate being perpendicular to the longitudinal axis of the second guide,
  • e) means for decoupling and adapting said probes.

Elle est caractérisée en ce que ledit dispositif comporte en outre:It is characterized in that said device also comprises:

f) un tube placé entre les premier et deuxième substrats et présentant à chaque extrémité des moyens de positionnement coopérant avec des moyens de positionnement complémentaires se trouvant sur les substrats de façon à assurer l'orthogonalité entre les deux sondes, la section interne dudit tube étant égale à la section externe du deuxième guide d'onde et lesdits moyens de découplage et d'adaptation étant solidaires dudit deuxième guide d'onde emmanché à l'intérieur dudit tube.f) a tube placed between the first and second substrates and having at each end positioning means cooperating with complementary positioning means located on the substrates so as to ensure orthogonality between the two probes, the internal section of said tube being equal to the external section of the second waveguide and said decoupling and adaptation means being integral with said second waveguide fitted inside said tube.

Dans un mode préféré de réalisation, les extrémités du tube comportent des languettes identiques et décalées de 90° d'une extrémité à l'autre et les substrats sur lesquels sont placées les sondes comportent des fentes complémentaires des languettes ayant les mêmes emplacements relatifs par rapport aux sondes.In a preferred embodiment, the ends of the tube have identical tongues and offset by 90 ° from one end to the other and the substrates on which the probes are placed have slots complementary to the tongues having the same relative locations with respect to to the probes.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description de quelques modes de réalisation du dispositif, faite en regard des figures annexées sur lesquelles:

  • -la figure 1 montre une antenne qui peut être utilisée en association avec le dispositif de l'invention,
  • -la figure 2 est une vue éclatée du dispositif de l'invention, permettant de montrer ses éléments constitutifs,
  • -la figure 3 est une vue en coupe du dispositif de l'invention lorsqu'il est assemblé,
  • -la figure 4 est une vue en coupe d'une variante du dispositif de l'invention lorsqu'il est assemblé,
  • -la figure 5 représente le détail de l'une des parties du dispositif de l'invention.
Other characteristics and advantages of the invention will become apparent with the description of some embodiments of the device, made with reference to the appended figures in which:
  • FIG. 1 shows an antenna which can be used in association with the device of the invention,
  • FIG. 2 is an exploded view of the device of the invention, making it possible to show its constituent elements,
  • FIG. 3 is a sectional view of the device of the invention when it is assembled,
  • FIG. 4 is a sectional view of a variant of the device of the invention when it is assembled,
  • FIG. 5 represents the detail of one of the parts of the device of the invention.

Le dispositif pour la réception d'ondes à double polarisation comporte, comme le montre la figure 1, une antenne de réception du type "Cassegrain" constituée d'un réflecteur paraboloïdal 1, au foyer duquel se trouve un réflecteur hyperboloïdal 2 qui renvoie les ondes électromagnétiques vers un cornet de réception 3 associé à un guide d'ondes 4 dont le rôle est de diriger les ondes vers les éléments actifs des circuits hautes-fréquences qui se trouvent à l'extrémité du guide d'ondes opposée à l'antenne.The device for receiving double polarization waves comprises, as shown in FIG. 1, a reception antenna of the "Cassegrain" type consisting of a paraboloid reflector 1, at the focus of which is a hyperboloid reflector 2 which returns the waves electromagnetic to a receiving horn 3 associated with a waveguide 4 whose role is to direct the waves towards the active elements of the high-frequency circuits which are at the end of the waveguide opposite the antenna.

La décomposition de l'onde à polarisation circulaire en deux ondes planes s'effectue, de façon connue, à l'aide d'un dépolariseur situé à la sortie du cornet de réception 3, dans le guide d'ondes 4. Ce dépolariseur, non représenté sur les figures, est en diélectrique ou en lame métallique.The circular polarization wave is decomposed into two plane waves, in known manner, using a depolarizer located at the outlet of the reception horn 3, in the wave guide 4. This depolarizer, not shown in the figures, is in dielectric or metal strip.

Les deux ondes ainsi obtenues sont orthogonales entre elles et continuent leur propagation à l'intérieur du guide d'ondes 4. Le dispositif dont la figure 2 montre, en vue éclatée, les éléments constitutifs permet la réception de ces deux ondes orthogonales.The two waves thus obtained are orthogonal to each other and continue their propagation inside the waveguide 4. The device of which FIG. 2 shows, in exploded view, the constituent elements allows the reception of these two orthogonal waves.

Le guide d'ondes 4 se présente sous là forme d'un cylindre ouvert à ses deux extrémités. L'une des extrémités est reliée à la sortie du cornet de réception 3 de la figure 1. A l'autre extrémité, destinée à être à proximité des circuits de réception, on trouve un évidement 41 pour le passage de la liaison électrique entre une sonde 51 et la tête hyperfréquence (non représentée) qui lui est associée.The waveguide 4 is in the form of a cylinder open at its two ends. One end is connected to the outlet of the reception horn 3 of FIG. 1. At the other end, intended to be near the reception circuits, there is a recess 41 for the passage of the electrical connection between a probe 51 and the microwave head (not shown) associated therewith.

Le dispositif comporte également un premier ensemble 5 de circuits hyperfréquences en microbandes sur lequel se trouve la première sonde 51 pour la réception de l'une des deux ondes issues de la décomposition du signal à double polarisation par le dépolariseur.The device also comprises a first set 5 of microwave circuits in microstrips on which the first probe 51 is located for the reception of one of the two waves resulting from the decomposition of the double polarization signal by the depolarizer.

Dans un mode de réalisation préféré de l'invention, cet ensemble est assemblé selon la technologie protégée par le Brevet Français no. 2 522 885 de la demanderesse.In a preferred embodiment of the invention, this assembly is assembled according to the technology protected by French Patent no. 2,522,885 to the plaintiff.

Il est constitué de deux substrats superposés: un substrat mince SM 5 destiné à la bande des ondes centimétriques et un substrat épais SE 5 destiné à la bande des ondes décimétriques.It consists of two superimposed substrates: a thin substrate SM 5 intended for the centimeter wave band and a thick substrate SE 5 intended for the decimeter wave band.

La sonde 51 destinée à la réception est réalisée par une métallisation de la face du substrat mince SM 5 non en regard du substrat épais SE 5.The probe 51 intended for reception is produced by metallization of the face of the thin substrate SM 5 not facing the thick substrate SE 5.

Cette sonde 51 possède une forme quasi triangulaire (section axiale d'une "carotte"), dont le sommet se trouve sensiblement au centre d'un cercle, délimité sur l'assemblage de substrats par des fentes F52, Fs3, F14 en forme d'arcs. Ces fentes traversent les deux substrats SM 5 et SE 5 de part en part. Une métallisation, non représentée, se trouve entre les deux substrats et sert de plan de masse.This probe 51 has an almost triangular shape (axial section of a "core"), the top of which is substantially in the center of a circle, delimited on the assembly of substrates by slots F 52 , F s3 , F 14 in the shape of arcs. These slots pass through the two substrates SM 5 and SE 5 right through. A metallization, not shown, is located between the two substrates and serves as a ground plane.

Le substrat mince SM 5 est destiné à se trouver en regard de l'extrémité du guide d'ondes 4 qui porte l'évidement 41.The thin substrate SM 5 is intended to be located opposite the end of the waveguide 4 which carries the recess 41.

Un guide 6, cylindrique, dont le diamètre intérieur est le même que le diamètre intérieur du guide 4 est destiné à être placé, par l'une de ses extrémités, en regard du substrat épais SE 5. A proximité de cette extrémité, dans la paroi du guide, sont ménagées deux fentes minces, diamétralement opposées, et parallèles à l'axe longitudinal du guide. Une seule de ces fentes 63 est visible sur la figure. Ces fentes sont destinées à recevoir une première lame métaiiique 61 pour l'adaptation de la sonde 51 et le découplage entre les deux accès comme il sera expliqué ultérieurement.A guide 6, cylindrical, the inside diameter of which is the same as the inside diameter of the guide 4, is intended to be placed, by one of its ends, opposite the thick substrate SE 5. Near this end, in the wall of the guide, are formed two thin slots, diametrically opposite, and parallel to the longitudinal axis of the guide. Only one of these slots 63 is visible in the figure. These slots are intended to receive a first metallic blade 61 for the adaptation of the probe 51 and the decoupling between the two accesses as will be explained later.

A l'autre extrémité de ce guide, se trouve un évidement 62 qui permet le passage de la seconde sonde (pour la réception du second signal).At the other end of this guide, there is a recess 62 which allows the passage of the second probe (for receiving the second signal).

Ce guide 6 possède également le même diamètre externe que le guide 4 relié au cornet.This guide 6 also has the same external diameter as the guide 4 connected to the horn.

Un tube 7 possède un diamètre interne égal au diamètre externe du guide 6, afin que ce dernier puisse être emmanché à l'intérieur.A tube 7 has an internal diameter equal to the external diameter of the guide 6, so that the latter can be fitted inside.

L'extrémité du tube 7 destinée à se trouver en regard du substrat épais de l'ensemble 5 possède des prolongements en forme de languettes L52, L53, L54 complémentaires des fentes F52, F53, F54 qui traversent les deux substrats SM 5 et SE 5, afin que ces languettes puissent être engagées dans les fentes, et que le tube 7 soit rendu solidaire de l'ensemble 5.The end of the tube 7 intended to be opposite the thick substrate of the assembly 5 has extensions in the form of tongues L 52 , L 53 , L 54 complementary to the slots F 52 , F 53 , F 54 which pass through the two substrates SM 5 and SE 5, so that these tongues can be engaged in the slots, and so that the tube 7 is made integral with the assembly 5.

L'autre extrémité du tube 7 est également terminée par des languettes L82, L83, L84, semblables à celles de l'autre extrémité, mais décalées de 90° par rapport à ces dernières.The other end of the tube 7 is also terminated by tabs L 82 , L 83 , L 84 , similar to those of the other end, but offset by 90 ° relative to the latter.

La longueur du tube 7, sans les languettes de chaque extrémité est égale à la longueur du guide 6. Un évidement 71 est ménagé entre deux languettes L82 et L83, afin d'être en regard de l'évidement 62 du guide 6 lorsque celui est en place, pour laisser le passage d'une liaison électrique entre une seconde sonde et une tête haute-fréquence.The length of the tube 7, without the tabs of each end is equal to the length of the guide 6. A recess 71 is formed between two tabs L 82 and L 83 , so as to be opposite the recess 62 of the guide 6 when that is in place, to allow the passage of an electrical connection between a second probe and a high-frequency head.

Deux fentes, dont une seule 72 est visible, sont ménagées dans la paroi du tube 7, parallèlement à son axe longitudinal pour permettre la mise en place de la lame métallique 61 dans les fentes 63 du guide 6.Two slots, of which only one 72 is visible, are formed in the wall of the tube 7, parallel to its longitudinal axis to allow the metal blade 61 to be placed in the slots 63 of the guide 6.

Les fentes 63 du guide 6 et 72 du tube 7 sont placées de façon à ce que la lame 61 d'adaptation de la sonde 51 soit parallèle à l'axe longitudinal de cette sonde lorsque les languettes L52, L53, L54 du tube 7 sont en place dans les fentes F52, F53, F54 de l'ensemble 5 portant cette sonde 51.The slots 63 of the guide 6 and 72 of the tube 7 are placed so that the adapter blade 61 of the probe 51 is parallel to the longitudinal axis of this probe when the tabs L 52 , L 53 , L 54 of the tube 7 are in place in the slots F 52 , F 53 , F 54 of the assembly 5 carrying this probe 51.

Les languettes du tube 7 et les fentes de l'ensemble 5 correspondantes sont agencées de façon qu'un seul positionnement de cet ensemble soit possible.The tongues of the tube 7 and the slots of the corresponding assembly 5 are arranged so that only one positioning of this assembly is possible.

Un second ensemble 8 comportant des éléments en microbandes est identique au premier et comporte une sonde 81 et trois fentes F82, F83, F84 destinées à coopérer avec les languettes Ls2, Ls3, L84 de l'autre extrémité du tube 8.A second assembly 8 comprising elements in microstrips is identical to the first and comprises a probe 81 and three slots F 82 , F 83 , F 84 intended to cooperate with the tongues L s2 , L s3 , L 84 of the other end of the tube 8.

La transition guide servant de sonde 81 est réalisée à l'aide d'une métallisation quasi triangulaire ménagée sur le substrat mince SM 8 du second ensemble 8. Cette sonde est reliée à l'étage amplificateur de la tête haute-fréquence par une liaison en microbandes passant par les évidements 71 du tube 7, et 62 du guide 6.The guide transition serving as probe 81 is produced using a quasi-triangular metallization formed on the thin substrate SM 8 of the second set 8. This probe is connected to the amplifier stage of the high-frequency head by a connection in microstrips passing through the recesses 71 of the tube 7, and 62 of the guide 6.

Un substrat épais SE 8 compose également cet ensemble 8 en microbandes, selon la technologie décrite dans le Brevet Français no. 2 522 885 déjà cité.A thick SE 8 substrate also makes up this set 8 of microstrips, according to the technology described in French Patent no. 2,522,885 already cited.

Des fentes F82, F83, F84 sont réalisées dans l'épaisseur des deux substrats, identiquement aux fentes FS2, F53, F14 du premier ensemble de circuits, et sont destinées à coopérer avec les languettes L82, L83, L84 du tube 7.Slots F 82 , F 83 , F 84 are made in the thickness of the two substrates, identical to the slots F S2 , F 53 , F 14 of the first set of circuits, and are intended to cooperate with the tongues L 82 , L 83 , L 84 of tube 7.

Une coupelle cylindrique 9, obturée par un fond de court-circuit, possède un diamètre interne égale au diamètre interne du guide 6 et un diamètre externe égal au diamètre interne du tube 7. Cette coupelle et prévue pour s'emmancher dans les languettes L82, L83, L84 lorsque le tube 7 est en place sur l'ensemble 8 de circuits en microbandes.A cylindrical cup 9, closed by a short-circuit bottom, has an internal diameter equal to the internal diameter of the guide 6 and an external diameter equal to the internal diameter of the tube 7. This cup is designed to be fitted into the tongues L 82 , L 83 , L 84 when the tube 7 is in place on the set 8 of microstrip circuits.

Les figures 3 et 4 montrent, selon une coupe passant par l'axe longitudinal de la sonde 51, le dispositif lorsque les éléments constitutifs sont en place.Figures 3 and 4 show, in a section passing through the longitudinal axis of the probe 51, the device when the constituent elements are in place.

Le guide d'ondes 4 destiné à être relié à l'antenne est au contact du substrat mince SM 5 du premier ensemble 5 de circuits hyperfréquence en microbandes. L'évidement 41 permet le passage de la sonde 51 et sa liaison électrique avec la tête hyperfréquence à laquelle elle est associée. Le second guide 6 est placé entre les deux ensembles 5 et 8 de circuits en microbandes. Par sa présence, il permet que les substrats SM 5, SE 5, SM 8, SE 8 et par conséquent les sondes 51 et 81 qu'il porte respectivement soient sur des plans parfaitement parallèles, tout en étant perpendiculaires à l'axe longitudinal des guides. Ceci est rendu possible car les extrémités des guides sont en section droite. Le tube 7 grâce aux languettes engagées dans les fentes des ensembles 5 et 8 de circuits en microbandes permet que les sondes soit orthogonales entre elles, car les languettes sont semblables d'une extrémité à l'autre mais décalées de 90°, et car les ensembles 5 et 8 de circuits en microbandes sont identiques, et ont notamment leurs fentes placées aux mêmes endroits par rapport aux sondes.The waveguide 4 intended to be connected to the antenna is in contact with the thin substrate SM 5 of the first set 5 of microwave circuits in microstrips. The recess 41 allows the passage of the probe 51 and its electrical connection with the microwave head with which it is associated. The second guide 6 is placed between the two sets 5 and 8 of microstrip circuits. By its presence, it allows the substrates SM 5, SE 5, SM 8, SE 8 and consequently the probes 51 and 81 which it carries respectively to be on perfectly parallel planes, while being perpendicular to the longitudinal axis of the guides. This is made possible because the ends of the guides are in cross section. The tube 7 thanks to the tongues engaged in the slots of the assemblies 5 and 8 of microstrip circuits allows the probes to be orthogonal to each other, because the tongues are similar from one end to the other but offset by 90 °, and because the sets 5 and 8 of microstrip circuits are identical, and in particular have their slots placed in the same places with respect to the probes.

Le maintien ferme du guide d'ondes 4 par rapport au premier ensemble 5 de circuit en microbande est assuré grâce aux languettes L52, L53, L54 comme le montrent les figures 3 et 4.Firm support of the waveguide 4 relative to the first set 5 of microstrip circuit is ensured by means of the tongues L 52 , L 53 , L 54 as shown in FIGS. 3 and 4.

La lame métallique 61 est soudée, après avoir été mise en place, à la fois dans les fentes 63 et 72 du guide 6 et du tube 7. Elle est placée parallèlement à l'axe longitudinal de la sonde 51 et ainsi réfléchit toutes les ondes qui lui sont parallèles. De ce fait, la sonde 51 est adaptée.The metal blade 61 is welded, after having been put in place, both in the slots 63 and 72 of the guide 6 and of the tube 7. It is placed parallel to the longitudinal axis of the probe 51 and thus reflects all the waves which are parallel to it. Therefore, the probe 51 is adapted.

La distance séparant les deux sondes est égale à une longueur d'ondes guidée. Pour que l'adaptation de la sonde soit effective, il faut que le milieu de la lame métallique 61 soit situé à une distance de la sonde 51 égale au quart de la longueur d'onde guidée. Ainsi, cette lame métallique renvoie vers la sonde 51 la composante du champ qui lui est parallèle, ce qui permet l'adaptation de la sonde 51 et l'établissement d'un bon découplage entre les deux accès.The distance between the two probes is equal to a guided wavelength. For the adaptation of the probe to be effective, the middle of the metal plate 61 must be located at a distance from the probe 51 equal to a quarter of the guided wavelength. Thus, this metal strip returns to the probe 51 the component of the field which is parallel to it, which allows the adaptation of the probe 51 and the establishment of a good decoupling between the two accesses.

La coupelle de terminaison 9 est maintenue sur l'ensemble d'une façon semblable au guide d'ondes 4: les languettes L82, L83, L84 passant dans les fentes du second ensemble 8 de circuits permettent ce maintien. Le fond de cette coupelle est maintenu parallèle à l'ensemble 8 de circuits, à une distance de la sonde 81 légèrement inférieure au quart de la longueur d'onde guidée. Ce fond de court-circuit permet l'adaptation de la seconde sonde 81.The termination cup 9 is held on the assembly in a manner similar to the waveguide 4: the tabs L 82 , L 83 , L 84 passing through the slots of the second set 8 of circuits allow this holding. The bottom of this cup is kept parallel to the set 8 of circuits, at a distance from the probe 81 slightly less than a quarter of the guided wavelength. This short-circuit bottom allows the adaptation of the second probe 81.

Il est possible d'améliorer le découplage en remplaçant la coupelle 9 par une deuxième lame métallique 91 parallèle à l'axe longitudinal de la sonde 81, comme le montre la figure 4. Cette lame est maintenue dans un guide circulaire 9 bis de mêmes diamètres interne et externe que les guides 4 et 6.It is possible to improve the decoupling by replacing the cup 9 with a second metal blade 91 parallel to the longitudinal axis of the probe 81, as shown in FIG. 4. This blade is held in a circular guide 9 bis of the same diameters internal and external as guides 4 and 6.

Cette lame métallique 91 est maintenue dans le guide 9 bis grâce à des fentes diamétralement opposées et parallèles à l'axe longitudinal de ce guide, comme il était le cas pour la lame métallique 61 du guide 6 et du tube 8.This metal blade 91 is held in the guide 9 bis thanks to diametrically slits opposite and parallel to the longitudinal axis of this guide, as was the case for the metal blade 61 of the guide 6 and of the tube 8.

Le découplage peut aussi être amélioré en plaçant une lame résistive entre la première lame métallique 61 et la seconde sonde 81 parallèlement à la lame 61. Cette lame absorbera le résidu de la composante du champ parallèle à la première sonde 51 qui n'aura pas été réfléchi par la lame métallique 61 et qui n'aura pas été capté par la première sonde 51.Decoupling can also be improved by placing a resistive strip between the first metal strip 61 and the second probe 81 parallel to the strip 61. This strip will absorb the residue of the component of the field parallel to the first probe 51 which will not have been reflected by the metal plate 61 and which will not have been picked up by the first probe 51.

L'utilisation de cette lame est indispensable lorsque les découplages entre les deux accès doivent être supérieurs aux valeurs exigées par les critères de réception des programmes de télévision par satellite.The use of this blade is essential when the decoupling between the two ports must be greater than the values required by the criteria for reception of satellite television programs.

La figure 5 représente une vue partielle, côté substrat mince SM 5, du premier ensemble 5 de circuits en microbandes. Le second ensemble 8 de circuits en microbandes possède également la structure représentée sur cette figure 5.FIG. 5 represents a partial view, on the thin substrate side SM 5, of the first set 5 of circuits in microstrips. The second set 8 of microstrip circuits also has the structure shown in this FIG. 5.

Les fentes F52, F53, F54 destinées à coopérer avec les languettes du tube 7 apparaissent sur cette figure. Une métallisation 10 annulaire possède un diamètre externe égal au diamètre interne des fentes et un diamètre interne égal à celui du guide d'ondes 4. Cette métallisation est pratiquée sur le substrat mince SM 5 et est reliée par un rivet R de transfert de masse au plan de masse qui, on le rappelle, est situé entre les deux substrats SM 5 et SE 5.The slots F 52 , F 53 , F 54 intended to cooperate with the tongues of the tube 7 appear in this figure. An annular metallization 10 has an external diameter equal to the internal diameter of the slots and an internal diameter equal to that of the waveguide 4. This metallization is carried out on the thin substrate SM 5 and is connected by a mass transfer rivet R to the ground plane which, as we recall, is located between the two substrates SM 5 and SE 5.

La sonde Si est reliée par l'intermédiaire d'une liaison 11 en microbandes au reste des circuits composant la tête hyperfréquences 12.The probe Si is connected via a link 11 in microstrips to the rest of the circuits making up the microwave head 12.

Cette métallisation permet, lorsque le dispositif est entièrement monté, que le guide d'ondes 4 soit relié à la masse.This metallization allows, when the device is fully assembled, that the waveguide 4 is connected to ground.

La métallisation similaire sur le substrat mince SM 8 du second ensemble de circuits en microbandes, permet le contact du guide d'ondes 6 situé entre les deux ensembles de circuits en microbandes avec le plan de masse compris entre les substrats minces SM 8 et épais SE 8 du second ensemble de circuits.The similar metallization on the thin substrate SM 8 of the second set of microstrip circuits allows the contact of the waveguide 6 located between the two sets of microstrip circuits with the ground plane between the thin substrates SM 8 and thick SE 8 of the second set of circuits.

De préférence, le contact électrique avec la masse est assuré en réalisant un cordon de soudure entre le guide 4 et la métallisation 10 du premier ensemble de circuits ou entre le guide 6 et la métallisation correspondante du second ensemble de circuits.Preferably, electrical contact with the ground is ensured by producing a weld bead between the guide 4 and the metallization 10 of the first set of circuits or between the guide 6 and the corresponding metallization of the second set of circuits.

De préférence, pour assurer une bonne rigidité mécanique à l'ensemble, des points de soudure sont assurés entre le guide d'ondes 4 et les languettes L52, L53, L54 et entre la coupelle 9 ou le guide 9 bis et les languettes L82, L83, L84 du tube 7.Preferably, to ensure good mechanical rigidity to the assembly, weld points are provided between the waveguide 4 and the tongues L 52 , L 53 , L 54 and between the cup 9 or the guide 9 bis and the tabs L 82 , L 83 , L 84 of the tube 7.

Claims (13)

1. A device for receiving a dual-polarized microwave signal supplied by an antenna (1, 2, 3) and separated by means of a depolarizer connected to said antenna into two orthogonal components of linear polarisation, said device comprising
a) a first waveguide (4) whose input is connected to the depolarizer output,
b) a first probe (51) located at the output of the first waveguide and comprising a first dielectric substrate (SM 5) and a first metal coating realised on one side of the first substrate, said substrate being positioned perpendicularly to the longitudinal axis of the first waveguide,
c) a second waveguide (6) whose input is located at the other side of said first substrate, said second waveguide having the same longitudinal axis as the first waveguide,
d) a second probe (81) located at the output of the second waveguide and comprising a second dielectric substrate (SM 8) and a second metal coating realised on one side of the second substrate, said substrate being positioned perpendicularly to the longitudinal axis of the second waveguide,
e) means for ensuring the discoupling and the matching of said probes, characterized in that it further comprises
f) a tube (7) placed between the first and the second substrates and presenting at each end positioning means which cooperate with corresponding positioning means on the substrates in order to ensure that the two probes are orthogonally positioned, the inner cross-section of said tube being equal to the outer cross-section of the second waveguide and said discoupling and matching means being integral with the second waveguide which is fitted into said tube.
2. A device according to claim 1, characterized in that the ends of the tube (7) comprise tongues (Ls2, L53, L54 and L82, Ls3, L84) of mutually identical shape but 90° shifted at one end with respect to the other, and that the substrates bearing the probes comprise slots (Fs2, F53, F54 and Fa2, F83, F84) of complementary shape with respect to the tongues, these slots occupying the same relative places as the probes (51, 81).
3. A device according to claim 1 or 2, characterized in that the waveguides (4, 6) have a circular cross-section.
4. A device according to any one of claims 1 to 3, characterized in that the probe discoupling and matching means comprise a first metal blade (61) mounted inside the second guide (6).
5. A device according to claim 4, characterized in that the metal blade (61) is placed in slots (63) of the guide (6) and in slots (72) of the tube (7) which are diametrically opposed to each other and are realized parallelly to the longitudinal axis of said waveguide and said tube, and that said blade is made integral with the waveguide (6) and the tube (7) by welding and is placed parallelly to the first probe (51).
6. A device according to claim 4 or 5, characterized in that the median area of the first blade (61) is at a distance from the first probe (51) corresponding to a quarter length of the guided wave in order to match the first probe (51) by returning to the probe the field component which is parallel thereto.
7. A device according to claims 5 and 6, characterized in that a resistor blade is placed between the second probe (81) and the first blade (61) parallelly to the latter in order to damp the rest of the field component which is parallel thereto and which is not reflected by the blade (61), in order to improve the discoupling between the two accesses.
8. A device according to any one of the preceding claims, characterized in that the first waveguide (4) connected to the antenna (1, 2, 3) is in contact with a metal coating (10) of the first substrate (SM 5), presents a cut-out (41) allowing the first probe (51) to pass therethrough, and is fitted into the tube (7) in such a way that it is firmly maintained on the circuits of this first substrate.
9. A device according to any one of the preceding claims, characterized in that an annular metal coating is provided on the second substrate (SM 8), and that one of the ends of the second waveguide (6) is in contact with this annular metal coating which, on the other hand, is connected to the mass plane of this second substrate (SM 8) by means of a mass transfer rivet (R).
10. A device according to any one of the preceding claims, characterized in that a cup (9) having a short-circuit bottom is fitted into the end of the tube (7) on the side of the second substrate in order to ensure the matching of the second probe (81).
11. A device according to any one of claims 1 to 9, characterized in that a second metal blade (91) is engaged in slots of a guide (9 bis) which are diametrically opposed and parallel to the longitudinal axis of this guide, and that this guide (9 bis) is fitted into the end of the tube (7) which passes through the second substrate in order to match the second probe (81) and to improve discoupling between the two accesses.
12. A device according to any one of the preceding claims, characterized in that the two probes (51, 81) are supported by units (5, 8) of circuits, each one composed of a thin substrate (SM 5, SM 8) and a thick substrate (SE 5, SE 8) in a superimposed relationship, a mass plane being provided between these substrates.
13. A device according to any one of the preceding claims, characterized in that the antenna to which it is associated comprises a paraboloid reflector (1) at the focus of which is located a hyperboloid reflector (2) transmitting the waves towards a reception cornet (3).
EP85401680A 1984-08-31 1985-08-23 Device for receiving dual polarized microwave signals Expired - Lifetime EP0174250B1 (en)

Priority Applications (1)

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AT85401680T ATE59248T1 (en) 1984-08-31 1985-08-23 DEVICE FOR RECEPTION OF DUAL POLARIZED MICROWAVE SIGNALS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8413509A FR2569907B1 (en) 1984-08-31 1984-08-31 DEVICE FOR RECEIVING DUAL POLARIZATION MICROWAVE SIGNALS
FR8413509 1984-08-31

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EP0174250A1 EP0174250A1 (en) 1986-03-12
EP0174250B1 true EP0174250B1 (en) 1990-12-19

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EP (1) EP0174250B1 (en)
AT (1) ATE59248T1 (en)
DE (1) DE3580956D1 (en)
FR (1) FR2569907B1 (en)

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US4596047A (en) * 1981-08-31 1986-06-17 Nippon Electric Co., Ltd. Satellite broadcasting receiver including a parabolic antenna with a feed waveguide having a microstrip down converter circuit
FR2523376A1 (en) * 1982-03-12 1983-09-16 Labo Electronique Physique RADIATION ELEMENT OR HYPERFREQUENCY SIGNAL RECEIVER WITH LEFT AND RIGHT CIRCULAR POLARIZATIONS AND FLAT ANTENNA COMPRISING A NETWORK OF SUCH JUXTAPOSED ELEMENTS
US4626865A (en) * 1982-11-08 1986-12-02 U.S. Philips Corporation Antenna element for orthogonally-polarized high frequency signals
US4529898A (en) * 1983-03-08 1985-07-16 Spetsialnoe Proektno-Konstruktorskoe I Tekhnologiches-Koe Bjuro Electrodynamic generator for generating seismic pulses
FR2544920B1 (en) * 1983-04-22 1985-06-14 Labo Electronique Physique MICROWAVE PLANAR ANTENNA WITH A FULLY SUSPENDED SUBSTRATE LINE ARRAY

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EP0174250A1 (en) 1986-03-12
FR2569907B1 (en) 1987-10-09
ATE59248T1 (en) 1991-01-15
FR2569907A1 (en) 1986-03-07
DE3580956D1 (en) 1991-01-31
US4695844A (en) 1987-09-22

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