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EP1655802B1 - Adjustable temperature compensation system for microwave resonators. - Google Patents

Adjustable temperature compensation system for microwave resonators. Download PDF

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Publication number
EP1655802B1
EP1655802B1 EP05110380A EP05110380A EP1655802B1 EP 1655802 B1 EP1655802 B1 EP 1655802B1 EP 05110380 A EP05110380 A EP 05110380A EP 05110380 A EP05110380 A EP 05110380A EP 1655802 B1 EP1655802 B1 EP 1655802B1
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Prior art keywords
cavity
temperature compensation
resonator
screw
cap
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EP05110380A
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German (de)
French (fr)
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EP1655802A1 (en
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Thales SA
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Thales SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • the invention relates to microwave resonators that are generally used in the field of terrestrial or space communications.
  • a microwave resonator is an electromagnetic circuit tuned to pass energy at a specific resonant frequency.
  • Microwave resonators can be used to make filters to reject the frequencies of a signal outside the filter bandwidth.
  • a resonator is in the form of a structure forming a cavity called resonant cavity whose dimensions are defined to obtain the desired resonance frequency.
  • any change in the dimensions of the cavity introducing a change in volume of the latter causes an offset of its resonant frequency and therefore a change in the bandwidth of the filter.
  • the changes in size of a resonant cavity may be due to expansion or contraction of the walls of the cavity caused by changes in temperature, all the more important as the material has a high rate of thermal expansion.
  • a first material with a very low thermal expansion rate such as Invar (registered mark) is used.
  • the second material used is generally aluminum, a material that has a higher thermal expansion rate than the Invar but which in addition has, in addition to its low density and therefore its lightness, a high heat dissipation power, making it particularly suitable for space applications.
  • each temperature compensation device must have dimensions adapted to the length of the resonant cavity with which it is associated or of which it forms part. Temperature compensation devices must be made with dimensions adapted to each cavity of different length.
  • the present invention solves this problem by proposing a system adapted equally well to cavities of the same length as to cavities of different lengths.
  • the proposed invention also makes it possible to propose a temperature compensation system that confers on the resonator a high temperature stability obtained by the adjustment device of said system.
  • the present invention relates to a device comprising a microwave resonator provided with at least one cavity having a predefined resonance frequency, the device also comprising a temperature compensation system made of a material with a very low thermal expansion rate. relative to that of the material in which the cavity is made, mainly characterized in that the temperature compensation system comprises a structure making it possible to counteract the effects induced on the resonator by temperature variations so that the resonance frequency of the cavity remains within a predetermined range, this device being also characterized and in that it comprises a device for adjusting the temperature compensation suitable for modify the volume of the cavity to set the value of the resonant frequency to its predefined value.
  • the adjustment system makes it possible to make a correction of the volume of the cavity by increasing or decreasing it when the compensation is not sufficient in order to obtain a cavity whose resonant frequency corresponds to the predefined resonant frequency.
  • the temperature compensation system and the temperature compensation adjustment device are coupled to each other and coupled to the resonator so as to exert forces on the cavity cover, along an axis corresponding to the axis.
  • longitudinal of the cavity the latter comprising a cylindrical wall having a longitudinal axis and two opposite ends, one of which is closed by the deformable cover.
  • the cover comprises a base closing one end of the cavity and a rod adjoining the base and extending out of the cavity along the longitudinal axis of the latter, so that the device adjustment of the compensation is arranged around this rod, this device being constituted by a constituent element of the temperature compensation system, said element being made of a very low thermal expansion rate material.
  • the device for adjusting the compensation is produced by means of a hollow-axis screw inside which the cap rod passes, the screw comprising a thread on its outer wall.
  • the temperature compensation system comprises two bars made of a material having a very low thermal expansion rate, these bars are arranged diametrically opposite around the cavity and the cavity has two fins on each of which is fixed one of the bars.
  • the bars are located on either side of the base of the cover and are coupled to each other above this base by means of a stirrup provided with a threaded passage for the hollow-axis screw and the stem of the cover passing through the screw.
  • the compensation adjustment device comprises a counter nut screwed above the stirrup around the screw.
  • the wall forming the cavity of the resonator and its fins is made of aluminum and the compensation adjustment screw is made in invar.
  • the device 1 illustrated on the figure 1 comprises at least one microwave resonator 10, a temperature compensation system 20 for this resonator and a compensation adjustment device 40.
  • the temperature compensation system comprises the compensation adjustment device. 40.
  • the compensation system 20 makes it possible to compensate for the volume variations of the cavity of the resonator induced by an increase in temperature by modifying the volume of this cavity so that the resonant frequency of the cavity remains within a predetermined range.
  • the adjustment system makes it possible to make a correction of the volume of the cavity by increasing or decreasing it when the compensation is not sufficient in order to obtain a cavity whose resonance frequency corresponds to the predefined resonant frequency, i.e. the resonant frequency of the cavity when operating under normal temperature conditions.
  • the temperature compensation and adjustment system proposed according to the invention thus makes it possible to maintain the resonant frequency of a resonator despite the temperature variations to which it can be subjected and this, even if the cavities of the resonators have lengths slightly different (of the order of mm or a few mm).
  • this system gives the resonator a high temperature stability thanks to the adjustment device.
  • the resonator 10 illustrated on the figure 1 is in the form of a cylindrical cavity 11 provided with a bottom 111 that can be coupled to another cavity (represented on the figure 2 ) and a hood 112.
  • the cover 112 has a cylindrical base 113 fixed to the cavity, extending by a rod 114 of smaller diameter, this rod being located in the longitudinal axis of the cavity 11.
  • the cavity 11 has on its outer wall two diametrically opposed fins 115 and 116, extending substantially over three quarters of its height taken in its upper part that is to say in the direction of the hood.
  • bars 21 and 22 made of a material with a very low rate of thermal expansion.
  • the bars extend on either side of the base of the cover 113 parallel to its longitudinal axis, that is to say to its rod 114.
  • the two bars are fixed at their upper end to a stirrup 30 having a portion 32, fitting the end of the bars 21 and 22 and a transverse portion 33 extending between the bars and having a passage 34 for the rod 114 of the hood, thus encircling the latter through the clamping element 40 of the constituent rod of the temperature compensation system.
  • This element 40 is made of a material with a very low rate of thermal expansion. All of these elements make it possible to obtain temperature compensation.
  • the bars are positioned on either side of the plane of the hood base 113, which is taken as a reference plane with respect to the deformations that the hood may undergo under the effect of the temperature compensation system and the system. setting this compensation.
  • the device for adjusting the temperature compensation comprises the clamping element 40.
  • This element 40 is formed for this purpose in the form of a screw 40 having a hollow shaft of diameter adapted to the diameter of the rod 114 so as to be placed around the stem.
  • the screw enters the threaded passage 34 of the stirrup 30.
  • the screw 40 is threaded on its outer wall, its inner wall is smooth.
  • the rod 114 is smooth, the mounting between the rod 114 and the screw 40 is slippery, the connection between the two elements is by pinching (adhesion) of the screw 40 on the rod 114 with the screws 62 and 63 housed in the head 41 of the screw.
  • the screw 40 can thus be mounted or lowered around the rod 114.
  • a counter nut 50 is placed above the passage formed in the stirrup 30 to fix the position of the screw when the latter is adjusted.
  • the head 41 of the screw 40 is split and forms several parts with elasticity which when tightened cause a pinch of the rod 114.
  • the head 41 of the screw comprises two recesses diametrically opposite to the axis of the rod 114 for the passage of the two screws 62 and 63 disposed in opposition to ensure the tightening of the parts of this head around the rod 114.
  • the bars 21, 22 and the screw 40 are in a very low thermal expansion material material such as Invar®.
  • the resonator 10, namely the cavity 11, its fins 115, 116 and the cover 112 are made of a material having a high thermal dissipation capacity, such as aluminum, but with a thermal expansion rate greater than that of the bars 21 and 22 and the screw 40.
  • the temperature compensation system comprises the two bars connected to the cavity and also to the hood via the stirrup and the screw.
  • the position of the screw 40 is adjusted after resonance frequency measurements made under the actual operating conditions of the resonator, that is to say after having subjected the resonator to the temperatures in which it will be made to operate.
  • the resonant frequency remains within a predetermined range of values.
  • the compensation is then adjusted by screwing or unscrewing the screw 40 so as to bring the resonance frequency to the predefined value.
  • the adjustment device 40 provides a latitude of about +/- 10% over the nominal compensation exerted by the bars and the screw, this latitude is obtained by adjusting the position of the screw.
  • the figure 2 illustrates an overview of a device according to the invention.
  • the resonator comprises two resonant cavities which are coupled and carry respectively the references 10 and 90.
  • Each resonant cavity is equipped with a temperature compensation system 20 and a compensation adjustment device 40 in accordance with the present invention. invention.
  • the entrance of signal is visible on the cavity 90 and bears the reference 91.
  • the clamping screws 62, 63 of the rod 114 are visible in this figure and on the figure 3 .
  • the figure 3 allows to illustrate the conformation of the head 41 of the screw 40 compensation adjustment.

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Abstract

The device has a temperature compensation system (20) with bars (21, 22) made of a material with low thermal expansion rate with respect to the material in which a cavity of a microwave resonator is made. The system has a screw (40), made of the material with low thermal expansion rate, to modify the volume of the cavity to adjust resonant frequency of the cavity to remain in a preset dead zone.

Description

L'invention concerne les résonateurs micro-ondes que l'on utilise généralement dans le domaine des communications terrestres ou spatiales.The invention relates to microwave resonators that are generally used in the field of terrestrial or space communications.

On rappelle qu'un résonateur micro-ondes est un circuit électromagnétique accordé pour laisser passer une énergie à une fréquence de résonance précise.It is recalled that a microwave resonator is an electromagnetic circuit tuned to pass energy at a specific resonant frequency.

Les résonateurs micro-ondes peuvent être utilisés pour réaliser des filtres afin de rejeter les fréquences d'un signal se trouvant en dehors de la bande passante du filtre.Microwave resonators can be used to make filters to reject the frequencies of a signal outside the filter bandwidth.

Un résonateur se présente sous la forme d'une structure formant une cavité dite cavité résonante dont les dimensions sont définies pour obtenir la fréquence de résonance désirée.A resonator is in the form of a structure forming a cavity called resonant cavity whose dimensions are defined to obtain the desired resonance frequency.

Ainsi tout changement dans les dimensions de la cavité introduisant un changement de volume de cette dernière provoque un décalage de sa fréquence de résonance et par conséquent un changement de la bande passante du filtre.Thus any change in the dimensions of the cavity introducing a change in volume of the latter causes an offset of its resonant frequency and therefore a change in the bandwidth of the filter.

Les changements de dimensions d'une cavité résonante peuvent être issus de dilatations ou de contractions des parois de la cavité provoquées par des changements de températures, d'autant plus importantes que le matériau a un taux d'expansion thermique élevé.The changes in size of a resonant cavity may be due to expansion or contraction of the walls of the cavity caused by changes in temperature, all the more important as the material has a high rate of thermal expansion.

Plusieurs techniques sont connues pour compenser la variation de volume d'une cavité, induite par les changements de températures de manière à maintenir la fréquence de résonance à la valeur prédéfinie dans des conditions de température normales (température ambiante aux alentour de 20 °C).Several techniques are known to compensate for the change in cavity volume induced by temperature changes so as to maintain the resonant frequency at the preset value under normal temperature conditions (ambient temperature around 20 ° C).

Ces techniques reposent le plus souvent sur l'utilisation de pièces qui entrent dans la structure de la cavité elle-même et qui sont constituées de matériaux à taux d'expansion thermique différent, l'un des taux étant beaucoup plus faible que l'autre. Les pièces sont agencées de manière à ce que les contraintes de dilatation entrent en opposition provoquant une déformation de la cavité dans le sens d'une réduction du volume lorsque la température augmente.These techniques are most often based on the use of parts that enter the structure of the cavity itself and are made of materials with different thermal expansion rates, one of the rates being much lower than the other . The parts are arranged in such a way that the expansion stresses come into conflict causing deformation of the cavity in the direction of a reduction in volume as the temperature increases.

De façon classique, on utilise un premier matériau à taux d'expansion thermique très faible tel que l'Invar (marque enregistrée). Le deuxième matériau utilisé est généralement l'aluminium, matériau qui a un taux d'expansion thermique plus élevé que l'Invar mais qui en revanche présente, outre sa faible densité et donc sa légèreté, un pouvoir de dissipation thermique élevé, le rendant particulièrement adapté aux applications spatiales.In a conventional manner, a first material with a very low thermal expansion rate such as Invar (registered mark) is used. The second material used is generally aluminum, a material that has a higher thermal expansion rate than the Invar but which in addition has, in addition to its low density and therefore its lightness, a high heat dissipation power, making it particularly suitable for space applications.

Reposant sur ce même principe d'utilisation de deux matériaux à taux d'expansion thermique différent, il existe également des dispositifs de compensation externes à la cavité. On pourra se reporter pour plus de détail, à la description d'un dispositif de compensation en température faite par exemple dans la demande de brevet EP 1 187 247 du 28 Août 2001.Based on the same principle of use of two materials with different thermal expansion rates, there are also compensation devices external to the cavity. For further details, reference may be made to the description of a temperature compensation device made, for example, in the application for EP Patent 1,187,247 of August 28, 2001.

L'inconvénient de ces différentes solutions réside dans le fait que chaque dispositif de compensation en température doit avoir des dimensions adaptées à la longueur de la cavité résonante auquel il est associé ou dont il fait partie. Des dispositifs de compensation en température doivent être réalisés avec des dimensions adaptées à chaque cavité de longueur différente.The disadvantage of these different solutions lies in the fact that each temperature compensation device must have dimensions adapted to the length of the resonant cavity with which it is associated or of which it forms part. Temperature compensation devices must be made with dimensions adapted to each cavity of different length.

La présente invention permet de résoudre ce problème en proposant un système adapté tout aussi bien à des cavités de même longueur qu'à des cavités de longueurs différentes.The present invention solves this problem by proposing a system adapted equally well to cavities of the same length as to cavities of different lengths.

L'invention proposée permet en outre de proposer un système de compensation en température conférant au résonateur une haute stabilité en température obtenue par le dispositif de réglage dudit système.The proposed invention also makes it possible to propose a temperature compensation system that confers on the resonator a high temperature stability obtained by the adjustment device of said system.

La présente invention a pour objet un dispositif comprenant un résonateur micro-onde muni d'au moins une cavité ayant une fréquence de résonance prédéfinie, le dispositif comprenant également un système de compensation en température réalisé dans un matériau à taux d'expansion thermique très faible par rapport à celui du matériau dans lequel est réalisé la cavité principalement caractérisé en ce que le système de compensation en température comporte une structure permettant de contre réagir aux effets induits sur le résonateur par des variations de température de manière à ce que la fréquence de résonance de la cavité reste comprise dans une plage prédéterminée, ce dispositif étant également caractérisé et en ce qu'il comprend un dispositif de réglage de la compensation en température apte à modifier le volume de la cavité pour régler la valeur de la fréquence de résonance à sa valeur prédéfinie. Le système de réglage permet d'effectuer une correction du volume de la cavité en l'augmentant ou en le diminuant lorsque la compensation n'est pas suffisante afin d'obtenir une cavité dont la fréquence de résonance correspond à la fréquence de résonance prédéfinie.The present invention relates to a device comprising a microwave resonator provided with at least one cavity having a predefined resonance frequency, the device also comprising a temperature compensation system made of a material with a very low thermal expansion rate. relative to that of the material in which the cavity is made, mainly characterized in that the temperature compensation system comprises a structure making it possible to counteract the effects induced on the resonator by temperature variations so that the resonance frequency of the cavity remains within a predetermined range, this device being also characterized and in that it comprises a device for adjusting the temperature compensation suitable for modify the volume of the cavity to set the value of the resonant frequency to its predefined value. The adjustment system makes it possible to make a correction of the volume of the cavity by increasing or decreasing it when the compensation is not sufficient in order to obtain a cavity whose resonant frequency corresponds to the predefined resonant frequency.

Selon une autre caractéristique, le système de compensation en température et le dispositif de réglage de la compensation en température sont couplés entre eux et couplés au résonateur de manière à exercer des efforts sur le capot de la cavité, suivant un axe correspondant à l'axe longitudinal de la cavité, cette dernière comprenant une paroi cylindrique présentant un axe longitudinal et deux extrémités opposées dont l'une est obturée par le capot déformable.According to another characteristic, the temperature compensation system and the temperature compensation adjustment device are coupled to each other and coupled to the resonator so as to exert forces on the cavity cover, along an axis corresponding to the axis. longitudinal of the cavity, the latter comprising a cylindrical wall having a longitudinal axis and two opposite ends, one of which is closed by the deformable cover.

Selon un mode de réalisation préféré, le capot comprend une base obturant une extrémité de la cavité et une tige attenante à la base et s'étendant hors de la cavité suivant l'axe longitudinal de cette dernière, de manière à ce que le dispositif de réglage de la compensation soit disposé autour de cette tige, ce dispositif étant constitué par un élément constitutif du système de compensation en température, ledit élément étant réalisé dans un matériau à taux d'expansion thermique très faible.According to a preferred embodiment, the cover comprises a base closing one end of the cavity and a rod adjoining the base and extending out of the cavity along the longitudinal axis of the latter, so that the device adjustment of the compensation is arranged around this rod, this device being constituted by a constituent element of the temperature compensation system, said element being made of a very low thermal expansion rate material.

Avantageusement, le dispositif de réglage de la compensation est réalisé au moyen d'une vis à axe creux à l'intérieur duquel passe la tige du capot, la vis comprenant un filetage sur sa paroi extérieure.Advantageously, the device for adjusting the compensation is produced by means of a hollow-axis screw inside which the cap rod passes, the screw comprising a thread on its outer wall.

Selon une autre caractéristique, le système de compensation en température comprend deux barreaux constitués d'un matériau ayant un taux d'expansion thermique très faible, ces barreaux sont disposés de façon diamétralement opposée autour de la cavité et la cavité présente deux ailerons sur chacun desquels est fixé l'un des barreaux.According to another characteristic, the temperature compensation system comprises two bars made of a material having a very low thermal expansion rate, these bars are arranged diametrically opposite around the cavity and the cavity has two fins on each of which is fixed one of the bars.

Les barreaux se trouvent de part et d'autre de la base du capot et sont couplés entre eux au dessus de cette base au moyen d'un étrier muni d'un passage fileté pour la vis à axe creux et la tige du capot traversant la vis.The bars are located on either side of the base of the cover and are coupled to each other above this base by means of a stirrup provided with a threaded passage for the hollow-axis screw and the stem of the cover passing through the screw.

Le dispositif de réglage de la compensation comporte un contre écrou vissé au dessus de l'étrier autour de la vis.The compensation adjustment device comprises a counter nut screwed above the stirrup around the screw.

Selon une autre caractéristique, la paroi formant la cavité du résonateur et ses ailerons, est réalisée en aluminium et la vis de réglage de la compensation est réalisée en invar.According to another characteristic, the wall forming the cavity of the resonator and its fins, is made of aluminum and the compensation adjustment screw is made in invar.

D'autres particularités et avantages de l'invention apparaîtront clairement à la lecture de la description qui est faite ci-après et qui est donnée à titre d'exemple illustratif et non limitatif et en regard des figures sur lesquelles :

  • la figure 1, représente le schéma d'une vue en coupe d'un dispositif selon un mode préféré de réalisation de la présente invention;
  • la figure 2, représente un schéma d'ensemble d'un dispositif avec deux cavités résonantes;
  • la figure 3, représente une vue de dessus de la vis de réglage de la compensation en température.
Other features and advantages of the invention will become clear from reading the description which is given below and which is given by way of illustrative and nonlimiting example and with reference to the figures in which:
  • the figure 1 , shows the schematic of a sectional view of a device according to a preferred embodiment of the present invention;
  • the figure 2 , represents an overall diagram of a device with two resonant cavities;
  • the figure 3 , represents a view from above of the adjustment screw of the temperature compensation.

Le dispositif 1 illustré sur la figure 1, comprend au moins un résonateur micro-onde 10, un système de compensation en température 20 pour ce résonateur et un dispositif de réglage de la compensation 40. Selon une réalisation préférée, le système de compensation en température comporte le dispositif de réglage de la compensation 40.The device 1 illustrated on the figure 1 , comprises at least one microwave resonator 10, a temperature compensation system 20 for this resonator and a compensation adjustment device 40. In a preferred embodiment, the temperature compensation system comprises the compensation adjustment device. 40.

Ainsi le système de compensation 20 permet de compenser les variations de volume de la cavité du résonateur induites par une augmentation de température en modifiant le volume de cette cavité afin que la fréquence de résonance de la cavité reste comprise dans une fourchette prédéterminée.Thus, the compensation system 20 makes it possible to compensate for the volume variations of the cavity of the resonator induced by an increase in temperature by modifying the volume of this cavity so that the resonant frequency of the cavity remains within a predetermined range.

Le système de réglage permet d'effectuer une correction du volume de la cavité en l'augmentant ou en le diminuant lorsque la compensation n'est pas suffisante afin d'obtenir une cavité dont la fréquence de résonance correspond à la fréquence de résonance prédéfinie, c'est-à-dire la fréquence de résonance de la cavité lors d'un fonctionnement dans des conditions normales de température.The adjustment system makes it possible to make a correction of the volume of the cavity by increasing or decreasing it when the compensation is not sufficient in order to obtain a cavity whose resonance frequency corresponds to the predefined resonant frequency, i.e. the resonant frequency of the cavity when operating under normal temperature conditions.

Le système de compensation en température et de réglage proposé selon l'invention permet ainsi de maintenir la fréquence de résonance d'un résonateur en dépit des variations de températures auquel il peut être soumis et cela, même si les cavités des résonateurs ont des longueurs légèrement différentes (de l'ordre du mm ou de quelques mm).The temperature compensation and adjustment system proposed according to the invention thus makes it possible to maintain the resonant frequency of a resonator despite the temperature variations to which it can be subjected and this, even if the cavities of the resonators have lengths slightly different (of the order of mm or a few mm).

Dans tous les cas, ce système confère au résonateur une haute stabilité en température grâce au dispositif de réglage.In all cases, this system gives the resonator a high temperature stability thanks to the adjustment device.

Le résonateur 10 illustré sur la figure 1, se présente sous la forme d'une cavité cylindrique 11 munie d'un fond 111 pouvant être couplée à une autre cavité (représentée sur la figure 2) et d'un capot 112. Le capot 112 possède une base cylindrique 113 fixée à la cavité, se prolongeant par une tige 114 de diamètre plus petit, cette tige étant située dans l'axe longitudinal de la cavité 11.The resonator 10 illustrated on the figure 1 , is in the form of a cylindrical cavity 11 provided with a bottom 111 that can be coupled to another cavity (represented on the figure 2 ) and a hood 112. The cover 112 has a cylindrical base 113 fixed to the cavity, extending by a rod 114 of smaller diameter, this rod being located in the longitudinal axis of the cavity 11.

La cavité 11 présente sur sa paroi extérieure deux ailerons diamétralement opposés 115 et 116, s'étendant sensiblement sur les trois quarts de sa hauteur pris dans sa partie haute c'est-à-dire en direction du capot.The cavity 11 has on its outer wall two diametrically opposed fins 115 and 116, extending substantially over three quarters of its height taken in its upper part that is to say in the direction of the hood.

Sur ces ailerons sont fixés respectivement par leur extrémité basse 210 et 220, des barreaux 21 et 22 constitués dans un matériau à très faible taux d'expansion thermique. Les barreaux s'étendent de part et d'autre de la base du capot 113 parallèlement à son axe longitudinal c'est-à-dire à sa tige 114.On these fins are respectively fixed by their lower end 210 and 220, bars 21 and 22 made of a material with a very low rate of thermal expansion. The bars extend on either side of the base of the cover 113 parallel to its longitudinal axis, that is to say to its rod 114.

Les deux barreaux sont fixés par leur extrémité haute à un étrier 30 présentant une partie 32, emboîtant l'extrémité des barreaux 21 et 22 et une partie transversale 33 s'étendant entre les barreaux et présentant un passage 34 pour la tige 114 du capot, encerclant ainsi cette dernière à travers l'élément de serrage 40 de la tige constitutif du système de compensation en température. Cet élément 40 est réalisé dans un matériau à très faible taux d'expansion thermique. L'ensemble de ces éléments permet d'obtenir une compensation en température.The two bars are fixed at their upper end to a stirrup 30 having a portion 32, fitting the end of the bars 21 and 22 and a transverse portion 33 extending between the bars and having a passage 34 for the rod 114 of the hood, thus encircling the latter through the clamping element 40 of the constituent rod of the temperature compensation system. This element 40 is made of a material with a very low rate of thermal expansion. All of these elements make it possible to obtain temperature compensation.

Ainsi, les barreaux sont positionnés de part et d'autre du plan de la base 113 du capot, lequel est pris comme plan de référence par rapport aux déformations que peut subir le capot sous l'effet du système de compensation en température et du système de réglage de cette compensation.Thus, the bars are positioned on either side of the plane of the hood base 113, which is taken as a reference plane with respect to the deformations that the hood may undergo under the effect of the temperature compensation system and the system. setting this compensation.

Le dispositif de réglage de la compensation en température comprend l'élément de serrage 40. Cet élément 40 est réalisé à cette fin sous la forme d'une vis 40 présentant un axe creux de diamètre adapté au diamètre de la tige 114 de manière être placé autour de la tige. La vis pénètre dans le passage 34 fileté de l'étrier 30. La vis 40 est filetée sur sa paroi extérieure, sa paroi interne est lisse. La tige 114 est lisse, le montage entre la tige 114 et la vis 40 est glissant, la liaison entre les deux éléments se fait par pincement (adhérence) de la vis 40 sur la tige 114 à l'aide des vis 62 et 63 logées dans la tête 41 de la vis.The device for adjusting the temperature compensation comprises the clamping element 40. This element 40 is formed for this purpose in the form of a screw 40 having a hollow shaft of diameter adapted to the diameter of the rod 114 so as to be placed around the stem. The screw enters the threaded passage 34 of the stirrup 30. The screw 40 is threaded on its outer wall, its inner wall is smooth. The rod 114 is smooth, the mounting between the rod 114 and the screw 40 is slippery, the connection between the two elements is by pinching (adhesion) of the screw 40 on the rod 114 with the screws 62 and 63 housed in the head 41 of the screw.

La vis 40 peut ainsi être montée ou descendue autour de la tige 114. Un contre écrou 50 est placé au dessus du passage ménagé dans l'étrier 30 pour fixer la position de la vis lorsque celle dernière est réglée.The screw 40 can thus be mounted or lowered around the rod 114. A counter nut 50 is placed above the passage formed in the stirrup 30 to fix the position of the screw when the latter is adjusted.

La tête 41 de la vis 40 est fendue et forme plusieurs parties présentant une élasticité qui lorsqu'elles sont resserrées provoquent un pincement de la tige 114. A cette fin, la tête 41 de la vis comporte deux logements diamétralement opposés par rapport à l'axe de la tige 114 pour le passage des deux vis 62 et 63 disposées en opposition afin d'assurer le serrage des parties de cette tête autour de la tige 114.The head 41 of the screw 40 is split and forms several parts with elasticity which when tightened cause a pinch of the rod 114. For this purpose, the head 41 of the screw comprises two recesses diametrically opposite to the axis of the rod 114 for the passage of the two screws 62 and 63 disposed in opposition to ensure the tightening of the parts of this head around the rod 114.

Les barreaux 21, 22 et la vis 40 sont dans un matériau à taux d'expansion thermique très faible comme par exemple l'Invar®.The bars 21, 22 and the screw 40 are in a very low thermal expansion material material such as Invar®.

Le résonateur 10 à savoir la cavité 11, ses ailerons 115, 116 et le capot 112 sont dans un matériau présentant un pouvoir de dissipation thermique élevé comme par exemple l'aluminium mais à taux d'expansion thermique supérieur à celui des barreaux 21 et 22 et de la vis 40.The resonator 10, namely the cavity 11, its fins 115, 116 and the cover 112 are made of a material having a high thermal dissipation capacity, such as aluminum, but with a thermal expansion rate greater than that of the bars 21 and 22 and the screw 40.

Le système de compensation en température comprend les deux barreaux reliés à la cavité et également au capot par le biais de l'étrier et de la vis.The temperature compensation system comprises the two bars connected to the cavity and also to the hood via the stirrup and the screw.

La position de la vis 40 est réglée après des mesures de fréquence de résonance effectuées dans les conditions réelles de fonctionnement du résonateur c'est-à-dire après avoir soumis le résonateur à des températures dans les quelles il sera amené à fonctionner.The position of the screw 40 is adjusted after resonance frequency measurements made under the actual operating conditions of the resonator, that is to say after having subjected the resonator to the temperatures in which it will be made to operate.

Ainsi lorsque la cavité tend à s'allonger sous les effets d'une augmentation de la température, les barreaux et la vis exercent des contraintes assurant des efforts dans l'axe du capot qui provoquent une déformation de ce dernier.Thus when the cavity tends to elongate under the effects of an increase in temperature, the bars and the screw exert stresses ensuring efforts in the axis of the cap which cause deformation of the latter.

La fréquence de résonance reste comprise dans une fourchette prédéterminée de valeurs. On procède alors au réglage de la compensation en vissant ou dévissant la vis 40 de manière à amener la fréquence de résonance à la valeur prédéfinie.The resonant frequency remains within a predetermined range of values. The compensation is then adjusted by screwing or unscrewing the screw 40 so as to bring the resonance frequency to the predefined value.

Le dispositif de réglage 40 offre une latitude d'environs +/-10% sur la compensation nominale exercée par les barreaux et la vis, cette latitude est obtenue en ajustant la position de la vis.The adjustment device 40 provides a latitude of about +/- 10% over the nominal compensation exerted by the bars and the screw, this latitude is obtained by adjusting the position of the screw.

La figure 2 illustre une vue d'ensemble d'un dispositif selon l'invention. Dans cet exemple le résonateur comporte deux cavités résonantes qui sont couplées et portent respectivement les références 10 et 90. Chaque cavité résonante est équipée d'un système de compensation en température 20 et d'un dispositif de réglage de la compensation 40 conformément à la présente invention. L'entrée de signal est visible sur la cavité 90 et porte la référence 91. Les vis de serrage 62, 63 de la tige 114 sont visibles sur cette figure et sur la figure 3.The figure 2 illustrates an overview of a device according to the invention. In this example the resonator comprises two resonant cavities which are coupled and carry respectively the references 10 and 90. Each resonant cavity is equipped with a temperature compensation system 20 and a compensation adjustment device 40 in accordance with the present invention. invention. The entrance of signal is visible on the cavity 90 and bears the reference 91. The clamping screws 62, 63 of the rod 114 are visible in this figure and on the figure 3 .

La figure 3 permet d'illustrer la conformation de la tête 41 de la vis 40 de réglage de la compensation.The figure 3 allows to illustrate the conformation of the head 41 of the screw 40 compensation adjustment.

Claims (8)

  1. System comprising a microwave resonator provided with at least one cavity (10) having a predefined resonant frequency, said system also comprising a temperature compensation system (20) that is made from a material having a coefficient of thermal expansion that is very low compared to that of the material from which said cavity is made, said temperature compensation system (20) including a structure for counteracting the effects of temperature variations on the resonator so that the resonant frequency of said cavity remains within a predetermined range, said cavity (10) comprising a cylindrical wall having a longitudinal axis (A) and two opposite ends, one of which is blocked by a deformable cap (113), and said temperature compensation system is coupled to said resonator so as to exert forces on said cap of said cavity along an axis corresponding to the longitudinal axis (A) of said cavity, characterized in that said temperature compensation system (20) comprises two rods (21, 22) made from a material having a very low coefficient of thermal expansion, these rods being placed so as to be diametrically opposed with respect to said cavity and on either side of said base of said cap (112) and being coupled together above said base by a stirrup member (30), said cavity having two fins (115, 116) to each of which one of said rods is fixed.
  2. System comprising a microvave resonator provided with at least one cavity according to Claim 1, characterized in that it further comprises a temperature compensation adjustment device (40) adapted to correct the volume of said cavity to adjust the value to said resonant frequency to a predefined value when compensation is not sufficient, said temperature compensation system and said temperature compensation adjustment device being coupled to each other and to said resonator so as to exert forces on said cap of said cavity along an axis corresponding to the longitudinal axis (A) of said cavity.
  3. System comprising a microwave generator provided with at least one cavity according to Claim 2, characterized in that said cap comprises a base (112) blocking one end of said cavity and a rod (114) joined to said base and extending out of said cavity along said longitudinal axis thereof and said compensation adjustment device is disposed around said rod and consists of a component (40) of said temperature compensation system (20).
  4. System comprising a microwave generator provided with at least one cavity according to Claim 3, characterized in that said compensation adjustment device (40) comprises a screw made from a material having a very low coefficient of thermal expansion, being threaded (60) on its exterior wall and having a hollow shaft into which said rod (114) of said cap passes.
  5. System comprising a microwave generator provided with at least one cavity according to Claim 4, characterized in that the stirrup member (30) is provided with a threaded passage (34) for said hollow shaft screw (40) and said rod (114) of said cap passing through said screw.
  6. System comprising a microwave generator provided with at least one cavity according to Claim 5, characterized in that said compensation adjustment device (40) includes a lock-nut (50) around said screw (40) above said stirrup member (30).
  7. System comprising a microwave generator provided with at least one cavity according to Claim 6, characterized in that said cavity of said resonator and its fins are defined by an aluminium wall.
  8. System comprising a microwave generator provided with at least one cavity according to Claim 4, characterized in that said compensation adjustment screw is made of Invar®.
EP05110380A 2004-11-09 2005-11-04 Adjustable temperature compensation system for microwave resonators. Active EP1655802B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452568A FR2877773B1 (en) 2004-11-09 2004-11-09 ADJUSTABLE TEMPERATURE COMPENSATION SYSTEM FOR MICROWAVE RESONATOR

Publications (2)

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EP1655802A1 EP1655802A1 (en) 2006-05-10
EP1655802B1 true EP1655802B1 (en) 2009-10-14

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EP05110380A Active EP1655802B1 (en) 2004-11-09 2005-11-04 Adjustable temperature compensation system for microwave resonators.

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US (1) US7453337B2 (en)
EP (1) EP1655802B1 (en)
CN (1) CN1812188B (en)
AT (1) ATE445920T1 (en)
CA (1) CA2523371C (en)
DE (1) DE602005017108D1 (en)
ES (1) ES2334038T3 (en)
FR (1) FR2877773B1 (en)

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DE102005001298A1 (en) * 2005-01-03 2006-07-13 Hydac Electronic Gmbh Device for measuring forces, in particular pressure sensor, and associated manufacturing method
US7564327B2 (en) 2006-10-05 2009-07-21 Com Dev International Ltd. Thermal expansion compensation assemblies
FR2917904B1 (en) * 2007-06-22 2009-09-18 Thales Sa MECHANICAL TEMPERATURE COMPENSATION DEVICE FOR WAVEGUIDE WITH PHASE STABILITY
FR2945673B1 (en) * 2009-05-15 2012-04-06 Thales Sa MULTI-MEMBRANE FLEXIBLE WALL DEVICE FOR FILTERS AND MULTIPLEXERS OF THERMO-COMPENSATED TECHNOLOGY
FR2965668B1 (en) * 2010-10-01 2013-05-10 Thales Sa DIELECTRIC RESONATOR HYPERFREQUENCY FILTER
FR3005209B1 (en) 2013-04-26 2015-04-10 Thales Sa HYPERFREQUENCY FILTER WITH DIELECTRIC ELEMENT
CN104347919B (en) * 2013-08-08 2017-08-25 北京飞卡科技有限公司 A kind of temperature compensation means and its temperature compensation for microwave filter
WO2016113999A1 (en) * 2015-01-13 2016-07-21 日本電業工作株式会社 Resonator and filter
CN112164883B (en) * 2020-08-21 2022-09-23 西安空间无线电技术研究所 A layered feed structure for maintaining sub-layer pressure in a temperature-changing environment

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Also Published As

Publication number Publication date
US7453337B2 (en) 2008-11-18
DE602005017108D1 (en) 2009-11-26
FR2877773B1 (en) 2007-05-04
EP1655802A1 (en) 2006-05-10
ATE445920T1 (en) 2009-10-15
CN1812188A (en) 2006-08-02
CA2523371A1 (en) 2006-05-09
ES2334038T3 (en) 2010-03-04
US20060097827A1 (en) 2006-05-11
CN1812188B (en) 2013-04-03
FR2877773A1 (en) 2006-05-12
CA2523371C (en) 2011-01-25

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