EP1445829B1 - Subreflector for Cassegrain microwave antenna - Google Patents

Subreflector for Cassegrain microwave antenna Download PDF

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Publication number
EP1445829B1
EP1445829B1 EP04290225A EP04290225A EP1445829B1 EP 1445829 B1 EP1445829 B1 EP 1445829B1 EP 04290225 A EP04290225 A EP 04290225A EP 04290225 A EP04290225 A EP 04290225A EP 1445829 B1 EP1445829 B1 EP 1445829B1
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EP
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Prior art keywords
reflector
ring
diameter
antenna
reduce
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Expired - Lifetime
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EP04290225A
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German (de)
French (fr)
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EP1445829A1 (en
Inventor
Armel Le Bayon
Michael Greiff
Denis Tuau
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Alcatel Lucent SAS
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Alcatel CIT SA
Alcatel SA
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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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/026—Means for reducing undesirable effects for reducing the primary feed spill-over
    • 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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface

Definitions

  • the present invention relates to secondary reflectors that are used in Cassegrain type microwave antennas. These antennas were first used in radar and are now widely used in satellite communication systems, especially in individual terrestrial stations.
  • Cassegrain microwave antennas are known in which a microwave source placed in the axis of a parabolic main reflector illuminates a secondary reflector located substantially at the focus of this main reflector. The microwave wave is reflected on this secondary reflector to then illuminate the main reflector which provides a radiation pattern in the form of a narrow beam. The operation is of course opposite in reception.
  • a known "microwave" source of such an antenna comprises a circular waveguide 101 through which the microwave wave arrives.
  • a hollow dielectric cone 102 is attached on one side to this guide and supports on the other side a secondary reflector 103.
  • the relatively complex shape of the surface of this reflector corresponds to the state of the art known to allow limiting the disadvantages mentioned above, in particular the overflow radiation.
  • a secondary reflector for a Cassegrain type microwave antenna comprising a basic secondary reflector, which comprises a first circular “ring” in the form of a cylinder of conductive material, with a diameter equal to the outside diameter. of the base reflector, fixed at one of its ends to the outer edge of this base reflector to protrude from the side of the reflective surface of the reflector and having a height H to reduce the "overflow radiation" of the secondary reflector.
  • the invention is characterized in that the reflector further comprises a second "ring" having the shape of a circular ring of conductive material, of internal diameter equal to the diameter of the first ring, fixed to the free end of this first ring and having a width h to increase the decrease of said overflow radiation.
  • the values of the parameters H and h are of the order of a quarter of the average wavelength for which the antenna is sized.
  • the first and second rings are made in the form of a single solid ring having a height H 'and a thickness h'
  • the reflector comprises a cone of solid dielectric material which connects the waveguide for supplying the antenna to the base reflector to enable the values of the parameters H 'and h' to be decreased with respect to the values of the parameters H and h.
  • the free end of the single solid ring is machined so as to have a recess which reduces its thickness on its outer circumference to increase the decrease of said overflow radiation.
  • the microwave source according to a first embodiment of the invention shown in section in FIGS. 2 and 3, comprises the same elements 101 to 103 as the source according to the known art shown in FIG.
  • the invention proposes to add to the basic secondary reflector 103 a first circular "ring" 104 which has the shape of a cylinder of height H and of diameter equal to the outside diameter of the reflector 103.
  • This ring is made of conductive material, preferably a metal which may be identical to that forming the secondary reflector 103. It is fixed by one of its ends to the outer edge of this reflector, so that it projects from the side of the reflecting surface of the reflector, in the direction of the waveguide 101.
  • the effect of this ring is essentially to hide the overflow radiation to redirect it to the useful surface of the main reflector. This gives an increase in the efficiency of the antenna which allows, for an identical efficiency, to substantially reduce the diameter of the secondary reflector, and therefore the diameter of the main reflector.
  • FIGS. 1 and 2 have been represented with the same dimensions and it should be understood that the source of FIG. 2 is represented on a larger scale in the case of identical effectiveness. If the sources are physically the same size, the efficiency of the antenna using the source of Figure 2 will be greater.
  • An improved variant of the invention proposes to add a second ring 105 which has the shape of a circular ring, also made of conductive material, of width h and inner diameter equal to the diameter of the first ring. This ring is attached to the free end of the first ring.
  • the edge 105 is used when the effect of the edge 104 is not sufficient. Indeed, if one tries to increase too much the size of the edge 104 (that is to say greater than a quarter of the wavelength) to improve a certain part of the diagram one may deteriorate another region of the radiation pattern .
  • the edge 105 improves the diagrams without this disadvantage.
  • the dimensions H and h are of the order of a quarter of the average wavelength for which the antenna is sized. Given the highly variable shapes known in the art, according to which the secondary reflector 103 can be made, the exact dimensions of these parameters will be determined by those skilled in the art using a few simple tests starting from this approximate dimension of a quarter of the wavelength. Given the simple geometric shapes used by the invention (cylinder and circular ring) these tests will require no particular effort.
  • the cone 402 which supports the secondary reflector 103 is made of a solid dielectric material which has the effect of reducing the wavelength inside this cone. Under these conditions the end of the cone penetrates inside the circular waveguide 401, for purely mechanical reasons.
  • the invention proposes to make the cylinder / crown assembly of the first embodiment in the form of a single solid ring 404 having a height H 'and a thickness h'. For best results, the free end of this ring, that facing the main reflector, is machined so as to have a recess 405 which reduces the thickness of the ring on its outer circumference.
  • FIG. 5 shows the radiation patterns 501 of a known antenna, and 502 of an antenna according to the invention. It is noted that the antenna pattern according to the invention is significantly improved, especially in the region corresponding to incidences greater than 30 °.
  • the invention makes it possible, by reducing the dimensions of the main reflector, to reduce the impact these antennas, making them easier to integrate into the landscape.

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  • Waveguide Aerials (AREA)

Abstract

The reflector (103) has a first circular ring (104) of cylindrical shape formed of a conductor material and directed toward a principle reflector. The ring has a diameter equal to an outer diameter of the reflector. The ring has one end fixed to outer side of reflector so as to project towards reflective side of the reflector, and is of specific height (H) to reduce the radiation spillover of the reflector. Preferably a second ring (105) in the form of a circular crown is fixed to the free edge of the first ring. The second ring has the same internal diameter as the first, and has a specific height (h) to further reduce reflector spillover. The values of the specific heights (H, h) are preferably of the order one quarter wavelength at the antenna operating frequency.

Description

La présente invention se rapporte aux réflecteurs secondaires qui sont utilisés dans les antennes hyperfréquences de type Cassegrain. Ces antennes ont d'abord été utilisées dans les radars et sont maintenant largement répandues dans les systèmes de communication par satellite, tout particulièrement dans les stations individuelles terrestres.The present invention relates to secondary reflectors that are used in Cassegrain type microwave antennas. These antennas were first used in radar and are now widely used in satellite communication systems, especially in individual terrestrial stations.

On connaît les antennes hyperfréquences de type Cassegrain dans lesquelles une source hyperfréquence placée dans l'axe d'un réflecteur principal parabolique vient illuminer un réflecteur secondaire situé sensiblement au foyer de ce réflecteur principal. L'onde hyperfréquence vient se réfléchir sur ce réflecteur secondaire pour illuminer ensuite le réflecteur principal qui permet d'obtenir un diagramme de rayonnement ayant la forme d'un faisceau étroit. Le fonctionnement est bien entendu inverse en réception.Cassegrain microwave antennas are known in which a microwave source placed in the axis of a parabolic main reflector illuminates a secondary reflector located substantially at the focus of this main reflector. The microwave wave is reflected on this secondary reflector to then illuminate the main reflector which provides a radiation pattern in the form of a narrow beam. The operation is of course opposite in reception.

La présence de réflecteur secondaire entraîne un certain nombre d'effets indésirables.The presence of secondary reflector causes a number of undesirable effects.

L'un de ces effets est de masquer une partie de la surface du réflecteur principal, ce qui diminue l'efficacité de celui-ci.One of these effects is to mask part of the surface of the main reflector, which decreases the effectiveness of the latter.

Un autre de ces effets est une perte d'une partie du rayonnement réfléchi par le réflecteur secondaire à l'extérieur de la surface du réflecteur principal. Ce "rayonnement de débordement", connu aussi sous le terme anglo-saxon de "spillover" s'échappe en pure perte vers l'arrière de l'antenne.Another of these effects is a loss of a portion of the radiation reflected by the secondary reflector outside the surface of the main reflector. This "overflowing radiation", also known as the Anglo-Saxon word "spillover" escapes to the rear of the antenna.

De gros efforts ont été faits pour réduire ces effets indésirables en modifiant la surface réflectrice du réflecteur secondaire par rapport à la forme initialement hyperbolique qui était celle du télescope optique de Cassegrain dont est issu ce type d'antenne hyperfréquence.Great efforts have been made to reduce these undesirable effects by modifying the reflective surface of the secondary reflector compared to the initially hyperbolic form which was that of the telescope Cassegrain optics from which this type of microwave antenna is derived.

Comme représenté sur la figure 1, une "source" hyperfréquence connue d'une telle antenne comprend un guide d'onde circulaire 101 par lequel arrive l'onde hyperfréquence. Un cône diélectrique creux 102 est attaché d'un côté sur ce guide et supporte de l'autre côté un réflecteur secondaire 103. La forme relativement complexe de la surface de ce réflecteur correspond à l'état de l'art connu pour permettre de limiter les inconvénients cités ci-dessus, en particulier le rayonnement de débordement.As shown in FIG. 1, a known "microwave" source of such an antenna comprises a circular waveguide 101 through which the microwave wave arrives. A hollow dielectric cone 102 is attached on one side to this guide and supports on the other side a secondary reflector 103. The relatively complex shape of the surface of this reflector corresponds to the state of the art known to allow limiting the disadvantages mentioned above, in particular the overflow radiation.

Même dans ce cas les dimensions du réflecteur secondaire, et donc son effet de masquage, demeurent importantes. Ceci nécessite d'augmenter en conséquence les dimensions du réflecteur principal pour obtenir les caractéristiques de gain et de directivité souhaitées.Even in this case the dimensions of the secondary reflector, and therefore its masking effect, remain important. This requires to increase accordingly the dimensions of the main reflector to obtain the desired gain and directivity characteristics.

En outre le rayonnement de débordement qui subsiste quand même, aussi léger qu'il soit, diminue les performances de l'antenne et nécessite lui aussi une augmentation corrélative des dimensions du réflecteur principal.In addition, the overflow radiation that still remains, however slight, reduces the performance of the antenna and also requires a corresponding increase in the dimensions of the main reflector.

Or il est de plus en plus nécessaire, principalement pour des raisons d'effet visuel, de limiter la taille des antennes de ce type, ce qui nécessite d'augmenter les performances du réflecteur secondaire et de diminuer sa taille.Now it is increasingly necessary, mainly for reasons of visual effect, to limit the size of antennas of this type, which requires increasing the performance of the secondary reflector and reduce its size.

Pour obtenir ces effets, l'invention propose un réflecteur secondaire pour antenne hyperfréquence de type Cassegrain comportant un réflecteur secondaire de base, qui comprend un premier "anneau" circulaire présentant la forme d'un cylindre en matériau conducteur, de diamètre égal au diamètre extérieur du réflecteur de base, fixé par l'une de ses extrémités au bord extérieur de ce réflecteur de base pour faire saillie du côté de la surface réfléchissante du réflecteur et ayant une hauteur H pour diminuer le "rayonnement de débordement" du réflecteur secondaire.To obtain these effects, the invention proposes a secondary reflector for a Cassegrain type microwave antenna comprising a basic secondary reflector, which comprises a first circular "ring" in the form of a cylinder of conductive material, with a diameter equal to the outside diameter. of the base reflector, fixed at one of its ends to the outer edge of this base reflector to protrude from the side of the reflective surface of the reflector and having a height H to reduce the "overflow radiation" of the secondary reflector.

L'invention est caractérisé en ce que le réflecteur comprend en outre un deuxième "anneau" présentant la forme d'une couronne circulaire en matériau conducteur, de diamètre intérieur égal au diamètre du premier anneau, fixée à l'extrémité libre de ce premier anneau et ayant une largeur h pour augmenter la diminution dudit rayonnement de débordement.The invention is characterized in that the reflector further comprises a second "ring" having the shape of a circular ring of conductive material, of internal diameter equal to the diameter of the first ring, fixed to the free end of this first ring and having a width h to increase the decrease of said overflow radiation.

Selon une autre caractéristique, les valeurs des paramètres H et h sont de l'ordre du quart de la longueur d'onde moyenne pour laquelle l'antenne est dimensionnée.According to another characteristic, the values of the parameters H and h are of the order of a quarter of the average wavelength for which the antenna is sized.

Selon une autre caractéristique, le premier et le deuxième anneaux sont réalisés sous la forme d'un anneau unique plein présentant une hauteur H' et une épaisseur h', et le réflecteur comprend un cône en matériau diélectrique plein qui relie le guide d'onde destiné à alimenter l'antenne au réflecteur de base pour permettre de diminuer les valeurs des paramètres H' et h' par rapport aux valeurs des paramètres H et h.According to another characteristic, the first and second rings are made in the form of a single solid ring having a height H 'and a thickness h', and the reflector comprises a cone of solid dielectric material which connects the waveguide for supplying the antenna to the base reflector to enable the values of the parameters H 'and h' to be decreased with respect to the values of the parameters H and h.

Selon une autre caractéristique, l'extrémité libre de l'anneau unique plein est usinée de manière à présenter un décrochement qui réduit son épaisseur sur sa circonférence extérieure pour augmenter la diminution dudit rayonnement de débordement.According to another feature, the free end of the single solid ring is machined so as to have a recess which reduces its thickness on its outer circumference to increase the decrease of said overflow radiation.

D'autres particularités et avantages de l'invention apparaîtront clairement dans la description suivante, faite en regard des figures annexées qui représentent :

  • la figure 1, une vue en coupe d'une source hyperfréquence comportant un réflecteur secondaire selon l'art connu ;
  • la figure 2, une vue en coupe d'une source hyperfréquence comportant un réflecteur secondaire selon l'invention;
  • la figure 3, une vue élargie d'un détail significatif de la figure 2 ;
  • la figure 4, une vue en coupe d'une source hyperfréquence selon une variante de l'invention ; et
  • la figure 5, deux diagrammes de rayonnement superposés correspondant respectivement aux sources des figures 1 et 2.
Other features and advantages of the invention will become clear in the following description, with reference to the appended figures which represent:
  • Figure 1 is a sectional view of a microwave source comprising a secondary reflector according to the prior art;
  • Figure 2 is a sectional view of a microwave source comprising a secondary reflector according to the invention;
  • Figure 3 is an enlarged view of a significant detail of Figure 2;
  • Figure 4, a sectional view of a microwave source according to a variant of the invention; and
  • FIG. 5, two superimposed radiation diagrams corresponding respectively to the sources of FIGS. 1 and 2.

La source hyperfréquence selon un premier mode de réalisation de l'invention représenté en coupe sur les figures 2 et 3, comprend les mêmes éléments 101 à 103 que la source selon l'art connu représentée sur la figure 1.The microwave source according to a first embodiment of the invention shown in section in FIGS. 2 and 3, comprises the same elements 101 to 103 as the source according to the known art shown in FIG.

L'invention propose de rajouter au réflecteur secondaire de base 103 un premier "anneau" circulaire 104 qui présente la forme d'un cylindre de hauteur H et de diamètre égal au diamètre extérieur du réflecteur 103. Cet anneau est réalisé en matériau conducteur, de préférence un métal qui peut être identique à celui formant le réflecteur secondaire 103. Il est fixé par l'une de ses extrémités au bord extérieur de ce réflecteur, de telle manière qu'il fasse saillie du côté de la surface réfléchissante du réflecteur, dans la direction donc du guide d'onde 101. L'effet de cet anneau est essentiellement de masquer le rayonnement de débordement pour le rediriger vers la surface utile du réflecteur principal. On obtient ainsi une augmentation du rendement de l'antenne qui permet, pour une efficacité identique, de diminuer substantiellement le diamètre du réflecteur secondaire, et donc le diamètre du réflecteur principal. Pour faciliter la lecture des dessins, les sources des figures 1 et 2 ont été représentées de mêmes dimensions et il faut comprendre que la source de la figure 2 est représentée à plus grande échelle dans le cas d'une efficacité identique. Si les sources sont physiquement de même taille, l'efficacité de l'antenne utilisant la source de la figure 2 sera plus grande.The invention proposes to add to the basic secondary reflector 103 a first circular "ring" 104 which has the shape of a cylinder of height H and of diameter equal to the outside diameter of the reflector 103. This ring is made of conductive material, preferably a metal which may be identical to that forming the secondary reflector 103. It is fixed by one of its ends to the outer edge of this reflector, so that it projects from the side of the reflecting surface of the reflector, in the direction of the waveguide 101. The effect of this ring is essentially to hide the overflow radiation to redirect it to the useful surface of the main reflector. This gives an increase in the efficiency of the antenna which allows, for an identical efficiency, to substantially reduce the diameter of the secondary reflector, and therefore the diameter of the main reflector. To facilitate the reading of the drawings, the sources of FIGS. 1 and 2 have been represented with the same dimensions and it should be understood that the source of FIG. 2 is represented on a larger scale in the case of identical effectiveness. If the sources are physically the same size, the efficiency of the antenna using the source of Figure 2 will be greater.

Une variante améliorée de l'invention propose de rajouter un deuxième anneau 105 qui présente la forme d'une couronne circulaire, elle aussi en matériau conducteur, de largeur h et de diamètre intérieur égal au diamètre du premier anneau. Cette couronne est fixée à l'extrémité libre du premier anneau.An improved variant of the invention proposes to add a second ring 105 which has the shape of a circular ring, also made of conductive material, of width h and inner diameter equal to the diameter of the first ring. This ring is attached to the free end of the first ring.

Le bord 105 est employé lorsque que l'effet du bord 104 ne suffit pas. En effet, si l'on cherche à augmenter trop la taille du bord 104 (c'est à dire supérieur au quart de la longueur d'onde) pour améliorer une certaine partie du diagramme on risque de détériorer une autre région du diagramme de rayonnement. Le bord 105 améliore les diagrammes sans avoir cet inconvénient.The edge 105 is used when the effect of the edge 104 is not sufficient. Indeed, if one tries to increase too much the size of the edge 104 (that is to say greater than a quarter of the wavelength) to improve a certain part of the diagram one may deteriorate another region of the radiation pattern . The edge 105 improves the diagrams without this disadvantage.

Les dimensions H et h sont de l'ordre du quart de la longueur d'onde moyenne pour laquelle l'antenne est dimensionnée. Compte tenu des formes très variables, connues dans l'art, selon lesquelles peut être réalisé le réflecteur secondaire 103, les dimensions exactes de ces paramètres seront déterminées par l'homme de l'art à l'aide de quelques essais simples en partant de cette dimension approximative du quart de la longueur d'onde. Compte tenu des formes géométriques simples utilisées par l'invention (cylindre et couronne circulaire) ces essais ne demanderont aucun effort particulier.The dimensions H and h are of the order of a quarter of the average wavelength for which the antenna is sized. Given the highly variable shapes known in the art, according to which the secondary reflector 103 can be made, the exact dimensions of these parameters will be determined by those skilled in the art using a few simple tests starting from this approximate dimension of a quarter of the wavelength. Given the simple geometric shapes used by the invention (cylinder and circular ring) these tests will require no particular effort.

À titre d'exemple de réalisation, on a déterminé que dans la bande 7,1-8,5 GHz une hauteur H de 14 mm et une largeur h de 9 mm permettaient d'obtenir, à performances égales, une réduction du diamètre du réflecteur secondaire de l'ordre de 30 %.As an exemplary embodiment, it was determined that in the band 7.1-8.5 GHz a height H of 14 mm and a width h of 9 mm made it possible to obtain, at equal performance, a reduction of the diameter of the secondary reflector of the order of 30%.

Dans un autre mode de réalisation de l'invention, représenté sur la figure 4, le cône 402 qui supporte le réflecteur secondaire 103 est réalisé dans un matériau diélectrique plein qui a pour effet de diminuer la longueur d'onde à l'intérieur de ce cône. Dans ces conditions l'extrémité du cône pénètre à l'intérieur du guide d'onde circulaire 401, pour des raisons purement mécaniques. L'invention propose alors de réaliser l'ensemble cylindre/couronne du premier mode de réalisation sous la forme d'un anneau unique plein 404 présentant une hauteur H' et une épaisseur h'. Pour obtenir les résultats les meilleurs, l'extrémité libre de cet anneau, celle tournée vers le réflecteur principal, est usinée de manière à présenter un décrochement 405 qui réduit l'épaisseur de l'anneau sur sa circonférence extérieure.In another embodiment of the invention, shown in FIG. 4, the cone 402 which supports the secondary reflector 103 is made of a solid dielectric material which has the effect of reducing the wavelength inside this cone. Under these conditions the end of the cone penetrates inside the circular waveguide 401, for purely mechanical reasons. The invention then proposes to make the cylinder / crown assembly of the first embodiment in the form of a single solid ring 404 having a height H 'and a thickness h'. For best results, the free end of this ring, that facing the main reflector, is machined so as to have a recess 405 which reduces the thickness of the ring on its outer circumference.

À titre d'exemple numérique pour ce deuxième mode de réalisation, on a déterminé que dans la bande 14,2-15,35 GHz une hauteur H' de 2 mm et une épaisseur h' de 4 mm permettait là aussi d'obtenir, à performances égales, une réduction du diamètre du réflecteur secondaire de l'ordre de 30 %.As a numerical example for this second embodiment, it has been determined that in the band 14.2-15.35 GHz a height H 'of 2 mm and a thickness h' of 4 mm also made it possible to obtain, with equal performances, a reduction in the diameter of the secondary reflector of the order of 30%.

Pour illustrer l'amélioration des performances, on a représenté sur la figure 5 les diagrammes de rayonnement 501 d'une antenne connue, et 502 d'une antenne selon l'invention. On constate que le diagramme de l'antenne selon l'invention est nettement amélioré, tout particulièrement dans la région correspondant à des incidences supérieures à 30°.To illustrate the improvement in performance, FIG. 5 shows the radiation patterns 501 of a known antenna, and 502 of an antenna according to the invention. It is noted that the antenna pattern according to the invention is significantly improved, especially in the region corresponding to incidences greater than 30 °.

Outre une amélioration des performances radioélectriques, l'invention permet, en diminuant les dimensions du réflecteur principal, de diminuer l'impact visuel de telles antennes, ce qui permet de les intégrer plus facilement dans le paysage.In addition to an improvement in radio performance, the invention makes it possible, by reducing the dimensions of the main reflector, to reduce the impact these antennas, making them easier to integrate into the landscape.

Claims (4)

  1. Secondary reflector for Cassegrain type microwave antenna including a basic secondary reflector (103), the secondary reflector comprising a first circular "ring" (104) taking the form of a conductive material cylinder whose diameter is equal to the outside diameter of the basic reflector fixed at one end to the outer edge of the basic reflector to project on the same side as the reflective surface of the reflector and having a height H to reduce spillover radiation from the secondary reflector, characterized in that it further comprises a second "ring" (105) taking the form of a circular conductive material ring whose inside diameter is equal to the diameter of the first ring fixed to the free end of the first ring and having a width h to reduce further said spillover radiation.
  2. Reflector according to claim 1, wherein the values of the parameters H and h are of the order of one quarter of the average wavelength for which the antenna is dimensioned.
  3. Reflector according to claim 1, wherein the first and second rings are produced in the form of a single solid ring (404) having a height H' and a thickness h' and the reflector comprises a solid dielectric material cone (402) that connects the waveguide (401) for energising the antenna to the basic reflector to reduce the values of the parameters H' and h' relative to the values of the parameters H and h.
  4. Reflector according to claim 3, wherein the free edge of the single solid ring (404) is machined to form a step (405) that reduces its thickness at its outside circumference to reduce further said spillover radiation.
EP04290225A 2003-02-04 2004-01-28 Subreflector for Cassegrain microwave antenna Expired - Lifetime EP1445829B1 (en)

Applications Claiming Priority (2)

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FR0301236 2003-02-04
FR0301236A FR2850796A1 (en) 2003-02-04 2003-02-04 SECONDARY REFLECTOR FOR CASSEGRAIN-TYPE MICROWAVE ANTENNA

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EP1445829A1 EP1445829A1 (en) 2004-08-11
EP1445829B1 true EP1445829B1 (en) 2006-06-28

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US (1) US6809695B2 (en)
EP (1) EP1445829B1 (en)
CN (1) CN1525599B (en)
AT (1) ATE332020T1 (en)
DE (1) DE602004001353T2 (en)
FR (1) FR2850796A1 (en)

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US20040150576A1 (en) 2004-08-05
US6809695B2 (en) 2004-10-26
EP1445829A1 (en) 2004-08-11
DE602004001353T2 (en) 2007-06-14
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CN1525599B (en) 2010-12-15
FR2850796A1 (en) 2004-08-06

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