EP0035922A1 - Tuning device with variable capacity and tunable microwave filter with at least one such device - Google Patents

Tuning device with variable capacity and tunable microwave filter with at least one such device Download PDF

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Publication number
EP0035922A1
EP0035922A1 EP81400240A EP81400240A EP0035922A1 EP 0035922 A1 EP0035922 A1 EP 0035922A1 EP 81400240 A EP81400240 A EP 81400240A EP 81400240 A EP81400240 A EP 81400240A EP 0035922 A1 EP0035922 A1 EP 0035922A1
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EP
European Patent Office
Prior art keywords
finger
plunger
hollow
tuning device
capacity
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Granted
Application number
EP81400240A
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German (de)
French (fr)
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EP0035922B1 (en
Inventor
Jea-Claude Curtinot
Xavier Delestre
Jean Fouillet
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Thales SA
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Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/219—Evanescent mode filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the invention relates to the field of frequency tunable microwave filters and more particularly to a variable capacity tuning device for such filters.
  • the transmission systems and in particular the telecommunication systems are designed to operate in a given frequency band, possibly comprising several channels and the system's microwave filters must be tuned to the desired channel.
  • the filters can be adjusted at the factory or when they are permanently installed; when the system is intended to operate successively on several frequency channels, the filters, then called “frequency agile", must be able to pass quickly and simply from one channel to another.
  • it is necessary to provide means for tuning the microwave filters used and this tuning will be easier if the number of elements to be varied will be small and their adjustment will have little influence on the characteristics. of the filter other than the tuning frequency.
  • the microwave filters commonly used are of several types: there are filters whose resonator elements are line sections, others for which these elements are in waveguide.
  • the most commonly used TEM inline resonator filters are the quarter wave resonator filters and comb resonator filters, charged by localized capacitive elements forming obstacles.
  • waveguide resonator filters they differ according to their mode of operation: when they work in propagation mode, i.e.
  • the the most used type is the half-wave resonator filter of the series type coupled by inductive susceptance; when they work in evanescent mode, that is to say at a frequency lower than the natural cut-off frequency of the guide, their structure is of the type with parallel resonators coupled by admittance inverters and they then comprise capacitive obstacles located.
  • the agreement of the filters is obtained by varying the form of localized inductive or capacitive obstacles associated with the TEM lines or the waveguides to form the filter.
  • the invention relates precisely to obstacles of the capacitive type and more particularly relates to a capacitive tuning device, usable in all filters comprising localized capacitive obstacles.
  • the capacitive tuning devices currently used are most often made using metal plungers penetrating into the guide or the line, and the adjustment of the capacity is obtained by varying the depression of this plunger; the variation of the. susceptance of the capacitive element (linked to the variation of the tuning frequency) thus obtained, as a function of the frequency, depends on the physical configuration of this element and on the section of the guide or of the line; but generally the law of variation of the tuning frequency, as a function of the displacement of the plunger is not at all linear.
  • the dimensions of the guide in the plane orthogonal to the axis of propagation are less than the wavelength corresponding to the natural cut-off frequency of the guide; consequently the localized capacity necessary to obtain the agreement, which is all the greater the lower the working frequency, must be housed in a smaller space.
  • the increase in the value of the capacity achieved by means of two opposite plungers is obtained by decreasing the interval separating them. Beyond a certain limit, this interval is too small to be adjusted with precision, all the more since the variations in temperature can, by the expansion of the metals which they entail, create very significant relative variations in this interval. .
  • variable capacity tuning devices comprising two coaxial fingers, one hollow, and the other comprising a movable plunger inside the hollow finger, make it possible to perform a capacity variation.
  • Different embodiments of such tuning devices have been described for example in French patents 1,046,593 or 880,808, in English patent 1,163,896, in American patent 3,273,083 or in German patent application 2,412 759. These devices always have only a variable component of the capacity determining the tuning frequency, its variation being determined by the greater or lesser penetration of the plunger.
  • the subject of the invention is a tuning device with double capacity component, which makes it possible to produce such filters.
  • a tuning device with variable capacity, for tunable microwave filter comprising two coaxial fingers, a first finger being hollow and the second comprising a plunger movable relative to the hollow finger, between a minimum insertion position where the plunger and hollow finger have no facing surfaces and a maximum insertion position where the plunger and hollow finger have maximum facing surfaces, in order to determine a variation in capacity, is characterized in that the plunger has a diameter much smaller than the outside diameter of the hollow finger and in that the second finger further comprises a body comprising at least one cylindrical part of the same diameter as a cylindrical part of the first finger, intended to face it, these two parts being movable one with respect to the other, the variable distance between the corresponding facing flat surfaces determining a second fraction of the variable capacity.
  • the invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity.
  • FIG. 1 represents the simplest embodiment of the tuning device according to the invention.
  • This device is shown in section, in place in a guide 1, l '.
  • This guide can be a wave guide in evanescent mode with a square, rectangular, round or even ellipsoidal section.
  • 1 - 1 ' can also represent the walls of a TEM line.
  • the capacitive device mainly comprises a metal finger, 10, fixed in the wall l 'and a threaded movable finger, 20, the wall 1 being tapped.
  • a nut 21 keeps the movable finger 20 in place.
  • the fixed finger 10 and the movable finger 20 are interpenetrating, the end of the finger 20 forming a tuning plunger. To obtain tuning in a given frequency range, F.
  • the minimum facing surfaces are chosen so that, when the end of the movable finger 20 forming a plunger is at the minimum penetration e min corresponding to the capacity minimum C min , this capacity C min is the tuning capacity for the highest frequency in the range, F max .
  • This capacity essentially depends on the distance d between the facing surfaces for this minimum penetration e min and the facing finger surfaces.
  • the stroke of the end of the movable finger forming a plunger 20 and the corresponding height of the cavity formed in the fixed finger 10, as well as their respective diameters, are chosen so that the maximum capacity C max corresponds to the minimum frequency F min of the desired frequency range of tuning, the opposite surfaces of the two plungers then being maximum.
  • the external shape of the tuning device thus produced varies a little and that the minimum capacity C min for the highest frequency of the range is not retained, the capacity produced evolving in its whole with the sinking of the diver.
  • a movable finger comprising a movable body allowing tuning at the high frequency of the tuning range and a small central plunger, also movable, introducing a variable additional capacity which is added to the minimum capacity C min corresponding to the minimum insertion of the small plunger but which does not modify the external shape of the tuning device.
  • the tuning device shown in FIG. 2 comprises a hollow fixed finger 10 and a movable finger comprising a body, 22, movable in the wall 1, the movable body being held in position by a nut 21.
  • This body 22 penetrates slightly into the cavity of the fixed finger 10.
  • this hollow mobile body is associated a small mobile plunger 23 screwed into the body 22, the depression of which is likely to vary between a minimum depression e min , the end of the small mobile plunger then flush with the end of the mobile body 22 and the capacity thus produced being a capacity C min corresponding to the highest frequency of the tuning range F max ,, and a maximum depression e max , the small plunger then coming into abutment inside the body 22 and the capacity thus produced being the maximum capacity C max corresponding to the minimum frequency of the tuning range.
  • the displacement of the small plunger can be of the order of 5 mm to 1 cm to cover the tuning range; the distance d between the flat surfaces of the two opposite fingers for the minimum insertion of the plunger, of the order of 5 tenths of a millimeter, is definitively adjusted for the highest frequency of the range, and only the small plunger is moved to get the variations of the tuning frequency.
  • the variation in capacitance obtained is such that the tuning frequency varies almost linearly with the depression.
  • the small plunger 23 is fixed in position by means of a nut 24 while bearing on the head of the mobile body 22.
  • FIG. 3 represents an analogous embodiment but for which the external dimensions of the fingers are. large in relation to the dimensions of the cylinders used to achieve the minimum capacity and the additional variable capacity added thereto.
  • the fixed finger 10 and the body 22 of the movable finger have their ends thinned so that the facing surfaces to achieve the minimum capacity C. are quite weak.
  • the movable body 22 does not enter the cavity of the fixed finger 10.
  • the hollow of the fixed finger 10 and the hollow of the body 22 of the mobile finger have the same diameter, adapted to the diameter of the small mobile plunger 23.
  • the minimum capacity C . is adjusted when the plunger 23 is placed in the high position at the minimum penetration e min and as in the embodiment of FIG.
  • the variation in capacity generated by the displacement of the plunger is such that the variation in tuning frequency is linear as a function of the displacement of the plunger.
  • the respective diameters of the hollow of the finger 10 and of the plunger are such that the displacement of the plunger makes it possible to cover the desired frequency range.
  • Such an embodiment of the capacitive tuning device has made it possible to cover the range of tuning frequencies 1.7 GHz to 2.1 GHz in a filter with evanescent mode, that is to say relatively high frequencies, the initial capacity for the 2.1 GHz frequency being relatively low.
  • the embodiment shown in Figure 4 allows to cover a relatively lower frequency range, the capacitance C. produced for the highest frequency of the range being higher than in the embodiment of FIG. 3.
  • the hollow body 22 has its end cut so as to penetrate into a hollow of corresponding diameter provided in the hollow fixed finger 10.
  • the flat surfaces and the cylindrical surfaces opposite the fixed finger 10 and the body 22 of the movable finger make it possible to achieve this capacity Cmin for the highest frequency in the range.
  • the body 22 is then fixed by means of the nut 21.
  • the external shape presented by the variable capacity tuning device in the guide does not vary in the tuning frequency range. The variation in additional capacity is obtained, as in the embodiments of FIGS.
  • the tuning frequency varies linearly with the sinking of the tuning plunger.
  • FIG. 5 represents an embodiment of a variable capacity tuning device particularly intended for so-called "frequency agile" filters, that is to say capable of passing rapidly from one tuning frequency to another within a determined range.
  • the fixed finger 10, the body 22 of the movable finger and the nut 21 which is linked to it are the same as those of the embodiment of FIG. 2, except that the interior of the body 22 is smooth and not threaded.
  • the mobile plunger 25 has the shape of a smooth piston capable of sliding in the hollow body 22.
  • the electrical contact between the piston 25 and the body of the microwave filter is obtained by means of the body 22 by means of a tip 26 forming clamps and extending the intermediate part of the piston 25.
  • variable capacity tuning device is invariable regardless of the tuning frequency. Consequently, throughout the tuning frequency range, the coupling of the resonator to the neighboring resonator or to the ports of the filter does not vary as a function of the tuning frequency. Similarly, the bandwidth is almost independent of the frequency this okay.
  • variable capacity tuning device leads to filters which are very easy to compensate for in temperature.
  • the variation of the tuning frequency being a linear function of the depression of the tuning plunger, and the elongations of the different mechanical elements constituting the capacitive elements also following linear laws
  • the materials and the dimensions of the elements relative to each other can be chosen in a fairly simple manner so that the temperature filter compensation can be achieved throughout the entire tuning range.
  • the overvoltage coefficient remains high throughout the frequency range of the filter.
  • the small plunger has a small diameter compared to the outside diameter of the two fingers, the stroke of the plunger is large compared to the previous embodiments and the adjustment of the filter is greatly facilitated. The resolution is also greatly improved.
  • the invention is not limited to the embodiments described and shown.
  • the external shapes of the fixed finger and of the movable finger are not limited to the shapes described by way of nonlimiting example with reference to FIGS. 1, 2, 3 and 4 (FIG. 5 taking up the form shown in the figure 2).
  • the shapes are determined from the minimum capacity to be produced, in particular in relation to the diameter of the fingers and the dimensions of the guides in which the tuning devices are placed to produce the filters.
  • the fixed finger was, in all the embodiments described, chosen as being the hollow finger, the movable finger in the body of the filter being the finger comprising the tuning plunger. It is of course possible to do the opposite, the finger movable relative to the body of the filter then being the hollow finger and the fixed finger then being the finger comprising the chord plunger, the chord plunger then being movable in a finger fixed.
  • the invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity, this filter can be a filter of the waveguide type in evanescent mode or a filter of the TEM line type comprising Localized capacitive elements.

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Abstract

Le dispositif d'accord comporte deux doigts coaxiaux, un doigt (10) fixe et un doigt (20) mobile dans le corps du filtre. L'.un de ces doigts (10) est creux et l'autre (20) comporte un plongeur d'accord (23) dont l'extrémité est cylindrique et qui est déplaçable par exemple par vissage dans le corps du doigt (20). La capacité minimale, obtenue lorsque l'enfoncement du plongeur est minimum, son extrémité affleurant au voisinage de l'extrémité du doigt (20) correspondant, est ajustable par déplacement du doigt mobile par rapport au doigt fixe. La capacité variable supplémentaire est obtenue par enfoncement du plongeur d'accord (23) dans le doigt creux(10).The tuning device comprises two coaxial fingers, a fixed finger (10) and a finger (20) movable in the body of the filter. One of these fingers (10) is hollow and the other (20) has a tuning plunger (23) whose end is cylindrical and which can be moved, for example, by screwing into the body of the finger (20) . The minimum capacity, obtained when the penetration of the plunger is minimum, its end flush with the vicinity of the end of the corresponding finger (20), is adjustable by displacement of the movable finger relative to the fixed finger. The additional variable capacity is obtained by pressing the tuning plunger (23) into the hollow finger (10).

. Application, notamment, aux filtres en mode évanescent accordables dans une grande gamme de fréquences.

Figure imgaf001
. Application, in particular, to filters in evanescent mode tunable in a wide range of frequencies.
Figure imgaf001

Description

L'invention se rapporte au domaine des filtres hyperfréquences accordables en fréquence et plus particulièrement à un dispositif d'accord à capacité variable pour de tels filtres.The invention relates to the field of frequency tunable microwave filters and more particularly to a variable capacity tuning device for such filters.

D'une manière générale, les systèmes de transmission et particulièrement les systèmes de télécommunucations sont conçus pour fonctionner dans une bande de fréquence donnée, comportant éventuellement plusieurs canaux et les filtres hyperfréquences du système doivent être accordés sur le canal désiré. Lorsque le système est destiné à fonctionner sur un canal de fréquences fixe, les filtres peuvent être réglés en usine ou lors de leur installation de manière définitive ; lorsque le système est destiné à fonctionner successivement sur plusieurs canaux de fréquences, les filtres, dits alors "agiles en fréquence", doivent pouvoir passer rapidement et simplement d'un canal à l'autre. Dans tous les cas, il est nécessaire de prévoir des moyens d'accord des filtres hyperfréquences utilisés, et cet accord sera d'autant plus facile à réaliser que le nombre d'éléments à faire varier sera petit et que leur réglage influencera peu les caractéristiques du filtre autres que la fréquence d'accord.In general, the transmission systems and in particular the telecommunication systems are designed to operate in a given frequency band, possibly comprising several channels and the system's microwave filters must be tuned to the desired channel. When the system is intended to operate on a fixed frequency channel, the filters can be adjusted at the factory or when they are permanently installed; when the system is intended to operate successively on several frequency channels, the filters, then called "frequency agile", must be able to pass quickly and simply from one channel to another. In all cases, it is necessary to provide means for tuning the microwave filters used, and this tuning will be easier if the number of elements to be varied will be small and their adjustment will have little influence on the characteristics. of the filter other than the tuning frequency.

Les filtres hyperfréquences couramment utilisés sont de plusieurs types : il existe des filtres dont les éléments résonateurs sont des tronçons de ligne, d'autres pour lesquels ces éléments sont en guide d'onde. Les filtres à résonateurs en ligne TEM les plus couramment utilisés sont les filtres intergidités à résonateurs quart d'onde et les filtres en peigne à résonateurs, chargés par des éléments capacitifs localisés formant obstacles. Les filtres à résonateurs en guide d'onde quant à eux se distinguent d'après leur mode de fonctionnement : lorsqu'ils travaillent en mode de propagation c'est-à-dire au-dessus de la fréquence de coupure propre du guide, le type le plus utilisé est le filtre à résonateur demi-onde du type série couplé par susceptance selfique ; lorsqu'ils travaillent en mode évanescent, c'est-à-dire à une fréquence inférieure à la fréquence de coupure propre du guide, leur structure est du type à résonateurs parallèles couplés par des inverseurs d'admittance et ils comportent alors des obstacles capacitifs localisés.The microwave filters commonly used are of several types: there are filters whose resonator elements are line sections, others for which these elements are in waveguide. The most commonly used TEM inline resonator filters are the quarter wave resonator filters and comb resonator filters, charged by localized capacitive elements forming obstacles. As for waveguide resonator filters, they differ according to their mode of operation: when they work in propagation mode, i.e. above the guide's own cut-off frequency, the the most used type is the half-wave resonator filter of the series type coupled by inductive susceptance; when they work in evanescent mode, that is to say at a frequency lower than the natural cut-off frequency of the guide, their structure is of the type with parallel resonators coupled by admittance inverters and they then comprise capacitive obstacles located.

L'accord des filtres est obtenu en faisant varier là forme des obstacles inductifs ou capacitifs localisés associés aux lignes TEM ou aux guides d'onde pour former le filtre.The agreement of the filters is obtained by varying the form of localized inductive or capacitive obstacles associated with the TEM lines or the waveguides to form the filter.

L'invention se rapporte précisément aux obstacles de type capacitif et a plus particulièrement pour objet un dispositif d'accord capacitif, utilisable dans tous les filtres comportant des obstacles capacitifs localisés.The invention relates precisely to obstacles of the capacitive type and more particularly relates to a capacitive tuning device, usable in all filters comprising localized capacitive obstacles.

Les dispositifs d'accord capacitifs utilisés actuellement sont le plus souvent réalisés à l'aide de plongeurs métalliques pénétrant'dans le guide ou la ligne, et le réglage de la capacité est obtenu en faisant varier l'enfoncement de ce plongeur; la variation de la. susceptance de l'élément capacitif (liée à la variation de la fréquence d'accord) ainsi obtenue, en fonction de la fréquence, dépend de la configuration physique de cet élément et de la section du guide ou de la ligne; mais d'une manière générale la loi de variation de la fréquence d'accord, en fonction du déplacement du plongeur n'est pas du tout linéaire. De plus, dans les filtres en mode évanescent, les dimensions du guide dans le plan orthogonal à l'axe de propagation sont inférieures à la longueur d'onde correspondant à la fréquence de coupure propre du guide; par conséquent la capacité localisée nécessaire pour obtenir l'accord, qui est d'autant plus grande que la fréquence de travail est basse, doit être logée dans un espace plus petit. L'augmentation de la valeur de la capacité réalisée au moyen de deux plongeurs se faisant face est obtenue en diminuant l'intervalle les séparant. Au-delà d'une certaine limite, cet intervalle est trop petit pour être ajusté avec précision, d'autant plus que les variations de température peuvent, par la dilatation des métaux qu'elles entraînent, créer des variations relatives très importantes de cet intervalle. D'autres types de dispositifs d'accord à capacité variable comportant deux doigts coaxiaux, l'un creux, et l'autre comportant un plongeur déplaçable à l'intérieur du doigt creux permettent de réaliser une variation de capacité. Différents modes de réalisation de tels dispositifs d'accord ont été décrits par exemple dans les brevets français 1 046 593 ou 880 808, dans le brevet anglais 1 163 896, dans le brevet américain 3 273 083 ou dans la demande de brevet allemand 2 412 759. Ces dispositifs ne comportent toujours qu'une composante variable de la capacité déterminant la fréquence d'accord, sa variation étant déterminée par l'enfoncement plus ou moins grand du plongeur.The capacitive tuning devices currently used are most often made using metal plungers penetrating into the guide or the line, and the adjustment of the capacity is obtained by varying the depression of this plunger; the variation of the. susceptance of the capacitive element (linked to the variation of the tuning frequency) thus obtained, as a function of the frequency, depends on the physical configuration of this element and on the section of the guide or of the line; but generally the law of variation of the tuning frequency, as a function of the displacement of the plunger is not at all linear. Furthermore, in the filters in evanescent mode, the dimensions of the guide in the plane orthogonal to the axis of propagation are less than the wavelength corresponding to the natural cut-off frequency of the guide; consequently the localized capacity necessary to obtain the agreement, which is all the greater the lower the working frequency, must be housed in a smaller space. The increase in the value of the capacity achieved by means of two opposite plungers is obtained by decreasing the interval separating them. Beyond a certain limit, this interval is too small to be adjusted with precision, all the more since the variations in temperature can, by the expansion of the metals which they entail, create very significant relative variations in this interval. . Other types of variable capacity tuning devices comprising two coaxial fingers, one hollow, and the other comprising a movable plunger inside the hollow finger, make it possible to perform a capacity variation. Different embodiments of such tuning devices have been described for example in French patents 1,046,593 or 880,808, in English patent 1,163,896, in American patent 3,273,083 or in German patent application 2,412 759. These devices always have only a variable component of the capacity determining the tuning frequency, its variation being determined by the greater or lesser penetration of the plunger.

Mais les gammes de variations de fréquences d'accord de ce type de dispositif ne permettent pas de réaliser des filtres accordables dans une large bande en conservant des caractéristiques convenables.But the ranges of tuning frequency variations of this type of device do not allow tunable filters to be produced in a wide band while retaining suitable characteristics.

L'invention a pour objet un dispositif d'accord à double composante de capacité, qui permet de réaliser de tels filtres.The subject of the invention is a tuning device with double capacity component, which makes it possible to produce such filters.

Suivant l'invention un dispositif d'accord à capacité variable, pour filtre hyperfréquence accordable, comportant deux doigts coaxiaux, un premier doigt étant creux et le second comportant un plongeur déplaçable par rapport au doigt creux, entre une position d'enfoncement minimum où le plongeur et le doigt creux n'ont pas de surfaces en regard et une position d'enfoncement maximum où le plongeur et le doigt creux ont des surfaces en regard maximum, pour déterminer une variation de capacité, est caractérisé en ce que le plongeur a un diamètre très inférieur au diamètre extérieur du doigt creux et en ce que le second doigt comporte en outre un corps comportant au moins une partie cylindrique de même diamètre qu'une partie cylindrique du premier doigt, destinée à lui faire face, ces deux parties étant déplaçables l'une par rapport à l'autre, la distance variable entre les surfaces planes en regard correspondantes déterminant une seconde fraction de la capacité variable.According to the invention a tuning device with variable capacity, for tunable microwave filter, comprising two coaxial fingers, a first finger being hollow and the second comprising a plunger movable relative to the hollow finger, between a minimum insertion position where the plunger and hollow finger have no facing surfaces and a maximum insertion position where the plunger and hollow finger have maximum facing surfaces, in order to determine a variation in capacity, is characterized in that the plunger has a diameter much smaller than the outside diameter of the hollow finger and in that the second finger further comprises a body comprising at least one cylindrical part of the same diameter as a cylindrical part of the first finger, intended to face it, these two parts being movable one with respect to the other, the variable distance between the corresponding facing flat surfaces determining a second fraction of the variable capacity.

L'invention a également pour objet un filtre hyperfréquence accordable comportant au moins un tel dispositif d'accord à capacité variable.The invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity.

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description qui suit en référence aux figures annexées.

  • Les figures 1, 2, 3 et 4 représentent, en section, différents modes de réalisation du dispositif d'accord à capacité variable selon l'invention, particulièrement destinés aux filtres à fréquence fixe.
  • La figure 5 représente un mode de réalisation du dispositif d'accord selon l'invention, particulièrement destiné aux filtres dits "agiles" en fréquence.
The invention will be better understood and other characteristics will appear from the following description with reference to the appended figures.
  • Figures 1, 2, 3 and 4 show, in section, different embodiments of the variable capacity tuning device according to the invention, particularly intended for fixed frequency filters.
  • FIG. 5 represents an embodiment of the tuning device according to the invention, particularly intended for so-called "frequency agile" filters.

Sur toutes les figures, les éléments analogues ont été désignés par les mêmes repères.In all the figures, similar elements have been designated by the same references.

La figure 1 représente le mode de réalisation le plus simple du dispositif d'accord selon l'invention. Ce dispositif est représenté en coupe, en place dans un guide 1, l'. Ce guide peut être un guide d'onde en mode évanescent de section carrée, rectangulaire, ronde ou même ellipsoïdale. 1 - 1' peut également représenter les parois d'une ligne TEM. Le dispositif capacitif comporte principalement un doigt métallique, 10,fixe dans la paroi l' et un doigt mobile fileté, 20, la paroi 1 étant taraudée. Un écrou 21 permet de maintenir en place le doigt mobile 20. Le doigt fixe 10 et le doigt mobile 20 sont interpénétrants, l'extrémité du doigt 20 formant plongeur d'accord. Pour obtenir l'accord dans une gamme de fréquences donnée, F . (fréquence minimum de la gamme) à Fmax (fréquence maximum de la gamme), les surfaces en regard minimales sont choisies pour que, lorsque l'extrémité du doigt mobile 20 formant plongeur est à l'enfoncement minimal emin correspondant à la capacité minimale Cmin, cette capacité Cmin soit la capacité d'accord pour la fréquence la plus haute de la gamme, Fmax. Cette capacité dépend essentiellement de la distance d entre les surfaces en regard pour cet enfoncement minimal emin et des surfaces de doigts en regard. La course de l'extrémité du doigt mobile formant plongeur 20 et la hauteur correspondante de la cavité formée dans le doigt fixe 10, ainsi que leurs diamètres respectifs, sont choisis pour que la capacité maximale Cmax corresponde à la fréquence minimale Fmin de la gamme de fréquences d'accord souhaitée, les surfaces en regard des deux plongeurs étant alors maximales.FIG. 1 represents the simplest embodiment of the tuning device according to the invention. This device is shown in section, in place in a guide 1, l '. This guide can be a wave guide in evanescent mode with a square, rectangular, round or even ellipsoidal section. 1 - 1 'can also represent the walls of a TEM line. The capacitive device mainly comprises a metal finger, 10, fixed in the wall l 'and a threaded movable finger, 20, the wall 1 being tapped. A nut 21 keeps the movable finger 20 in place. The fixed finger 10 and the movable finger 20 are interpenetrating, the end of the finger 20 forming a tuning plunger. To obtain tuning in a given frequency range, F. (minimum frequency of the range) at F max (maximum frequency of the range), the minimum facing surfaces are chosen so that, when the end of the movable finger 20 forming a plunger is at the minimum penetration e min corresponding to the capacity minimum C min , this capacity C min is the tuning capacity for the highest frequency in the range, F max . This capacity essentially depends on the distance d between the facing surfaces for this minimum penetration e min and the facing finger surfaces. The stroke of the end of the movable finger forming a plunger 20 and the corresponding height of the cavity formed in the fixed finger 10, as well as their respective diameters, are chosen so that the maximum capacity C max corresponds to the minimum frequency F min of the desired frequency range of tuning, the opposite surfaces of the two plungers then being maximum.

Dans ce mode de réalisation, il faut noter que la forme extérieure du dispositif d'accord ainsi réalisé varie un peu et que la capacité minimale Cmin pour la fréquence la plus haute de la gamme n'est pas conservée, la capacité réalisée évoluant dans son ensemble avec l'enfoncement du plongeur.In this embodiment, it should be noted that the external shape of the tuning device thus produced varies a little and that the minimum capacity C min for the highest frequency of the range is not retained, the capacity produced evolving in its whole with the sinking of the diver.

Les modes de réalisation représentés sur les figures suivantes sont perfectionnés : ils comportent un doigt mobile comportant un corps mobile permettant l'accord à la fréquence haute de la gamme d'accord et un petit plongeur central, également mobile, introduisant une capacité supplémentaire variable qui s'ajoute à la capacité minimale Cmin correspondant à l'enfoncement minimal du petit plongeur mais qui ne modifie pas la forme extérieure du dispositif d'accord.The embodiments shown in the following figures are improved: they include a movable finger comprising a movable body allowing tuning at the high frequency of the tuning range and a small central plunger, also movable, introducing a variable additional capacity which is added to the minimum capacity C min corresponding to the minimum insertion of the small plunger but which does not modify the external shape of the tuning device.

Le dispositif d'accord représenté sur la figure 2 comporte un doigt fixe creux 10 et un doigt mobile comportant un corps, 22, mobile dans la paroi 1, le corps mobile étant maintenu en position par un écrou 21. Ce corps 22 pénètre légèrement dans la cavité du doigt fixe 10. A ce corps mobile creux est associé un petit plongeur mobile 23 vissé dans le corps 22, dont l'enfoncement est susceptible de varier entre un enfoncement minimum emin, l'extrémité du petit plongeur mobile affleurant alors à l'extrémité du corps mobile 22 et la capacité ainsi réalisée étant une capacité Cmin correspondant à la fréquence la plus haute de la gamme d'accord Fmax, , et un enfoncement maximum emax, le petit plongeur venant alors en butée à l'intérieur du corps 22 et la capacité ainsi réalisée étant la capacité maximum Cmax correspondant à la fréquence minimale de la gamme d'accord. Le déplacement du petit plongeur peut être de l'ordre de 5 mm à 1 cm pour couvrir la gamme d'accord ; la distance d entre les surfaces planes des deux doigts en regard pour l'enfoncement minimal du plongeur, de l'ordre de 5 dizièmes de millimètre, est ajustée définitivement pour la fréquence la plus élevée de la gamme, et seul le petit plongeur est déplacé pour obtenir les variations de la fréquence d'accord.The tuning device shown in FIG. 2 comprises a hollow fixed finger 10 and a movable finger comprising a body, 22, movable in the wall 1, the movable body being held in position by a nut 21. This body 22 penetrates slightly into the cavity of the fixed finger 10. With this hollow mobile body is associated a small mobile plunger 23 screwed into the body 22, the depression of which is likely to vary between a minimum depression e min , the end of the small mobile plunger then flush with the end of the mobile body 22 and the capacity thus produced being a capacity C min corresponding to the highest frequency of the tuning range F max ,, and a maximum depression e max , the small plunger then coming into abutment inside the body 22 and the capacity thus produced being the maximum capacity C max corresponding to the minimum frequency of the tuning range. The displacement of the small plunger can be of the order of 5 mm to 1 cm to cover the tuning range; the distance d between the flat surfaces of the two opposite fingers for the minimum insertion of the plunger, of the order of 5 tenths of a millimeter, is definitively adjusted for the highest frequency of the range, and only the small plunger is moved to get the variations of the tuning frequency.

La variation de capacité obtenue est telle que la fréquence d'accord varie quasi-linéairement avec l'enfoncement. Le petit plongeur 23 est fixé en position au moyen d'un écrou 24 en prenant appui sur la tête du corps mobile 22.The variation in capacitance obtained is such that the tuning frequency varies almost linearly with the depression. The small plunger 23 is fixed in position by means of a nut 24 while bearing on the head of the mobile body 22.

La figure 3 représente un mode de réalisation analogue mais pour lequel les dimensions extérieures des doigts sont. grandes par rapport aux dimensions des cylindres utilisés pour réaliser la capacité minimale et la capacité variable supplémentaire qui lui est ajoutée. Le doigt fixe 10 et le corps 22 du doigt mobile ont leurs extrémités amincies de façon que les surfaces en regard pour réaliser la capacité minimale C . soient assez faibles. Le corps mobile 22 ne pénètre pas dans la cavité du doigt fixe 10. Par contre le creux du doigt fixe 10 et le creux du corps 22 du doigt mobile ont le même diamètre, adapté au diamètre du petit plongeur mobile 23. La capacité minimale C . est ajustée lorsque le plongeur 23 est placé en position haute à l'enfoncement minimal emin et comme dans le mode de réalisation de la figure 2, la variation de capacité engendrée par le déplacement du plongeur est telle que la variation de fréquence d'accord est linéaire en fonction du déplacement du plongeur. Les diamètres respectifs du creux du doigt 10 et du plongeur sont tels que le déplacement du plongeur permette de couvrir la gamme de fréquences souhaitée. Un tel mode de réalisation du dispositif d'accord capacitif a permis de couvrir la gamme de fréquences d'accord 1,7 GHz à 2,1 GHz dans un filtre à mode évanescent, c'est-à-dire des fréquences relativement hautes, la capacité initiale pour la fréquence 2,1 GHz étant relativement faible.FIG. 3 represents an analogous embodiment but for which the external dimensions of the fingers are. large in relation to the dimensions of the cylinders used to achieve the minimum capacity and the additional variable capacity added thereto. The fixed finger 10 and the body 22 of the movable finger have their ends thinned so that the facing surfaces to achieve the minimum capacity C. are quite weak. The movable body 22 does not enter the cavity of the fixed finger 10. On the other hand, the hollow of the fixed finger 10 and the hollow of the body 22 of the mobile finger have the same diameter, adapted to the diameter of the small mobile plunger 23. The minimum capacity C . is adjusted when the plunger 23 is placed in the high position at the minimum penetration e min and as in the embodiment of FIG. 2, the variation in capacity generated by the displacement of the plunger is such that the variation in tuning frequency is linear as a function of the displacement of the plunger. The respective diameters of the hollow of the finger 10 and of the plunger are such that the displacement of the plunger makes it possible to cover the desired frequency range. Such an embodiment of the capacitive tuning device has made it possible to cover the range of tuning frequencies 1.7 GHz to 2.1 GHz in a filter with evanescent mode, that is to say relatively high frequencies, the initial capacity for the 2.1 GHz frequency being relatively low.

Le mode de réalisation représenté sur la figure 4 permet de couvrir une gamme de fréquences relativement plus basse, la capacité C . réalisée pour la fréquence la plus haute de la gamme étant plus élevée que dans le mode de réalisation de la figure 3. Pour cela le corps creux 22 a son extrémité découpée de façon à pénétrer dans un creux de diamètre correspondant prévu dans le doigt fixe creux 10. Les surfaces planes et les surfaces cylindriques en regard du doigt fixe 10 et du corps 22 du doigt mobile permettent de réaliser cette capacité Cmin pour la fréquence la plus haute de la gamme. Le corps 22 est alors fixé au moyen de l'écrou 21. La forme extérieure présentée par le dispositif d'accord à capacité variable dans le guide ne varie pas dans la gamme de fréquence d'accord. La variation de capacité supplémentaire est obtenue, comme dans les modes de réalisation des figures 2 et 3, par un petit plongeur 23, le doigt fixe comportant une seconde partie creuse, mais cette fois d'un diamètre correspondant au diamètre du petit plongeur. Comme précédemment, à partir de l'enfoncement minimal, la fréquence d'accord varie linéairement avec l'enfoncement du plongeur d'accord. Ce mode de réalisation a permis de réaliser un dispositif d'accord à capacité variable permettant l'accord dans la gamme 1,35 GHz à 1,7 GHz d'un filtre hyperfréquences en mode évanescent.The embodiment shown in Figure 4 allows to cover a relatively lower frequency range, the capacitance C. produced for the highest frequency of the range being higher than in the embodiment of FIG. 3. For this, the hollow body 22 has its end cut so as to penetrate into a hollow of corresponding diameter provided in the hollow fixed finger 10. The flat surfaces and the cylindrical surfaces opposite the fixed finger 10 and the body 22 of the movable finger make it possible to achieve this capacity Cmin for the highest frequency in the range. The body 22 is then fixed by means of the nut 21. The external shape presented by the variable capacity tuning device in the guide does not vary in the tuning frequency range. The variation in additional capacity is obtained, as in the embodiments of FIGS. 2 and 3, by a small plunger 23, the fixed finger comprising a second hollow part, but this time with a diameter corresponding to the diameter of the small plunger. As before, from the minimum sinking, the tuning frequency varies linearly with the sinking of the tuning plunger. This embodiment made it possible to produce a tuning device with variable capacity allowing tuning in the range 1.35 GHz to 1.7 GHz of a microwave filter in evanescent mode.

La figure 5 représente un mode de réalisation d'un dispositif d'accord à capacité variable particulièrement destiné aux filtres dits "agiles" en fréquence, c'est-à-dire susceptibles de passer rapidement d'une fréquence d'accord à une autre dans une gamme déterminée. Le doigt fixe 10, le corps 22 du doigt mobile et l'écrou 21 qui lui est lié sont les mêmes que ceux du mode de réalisation de la figure 2, si ce n'est que l'intérieur du corps 22 est lisse et non fileté. Par contre le plongeur mobile 25 a la forme d'un piston lisse susceptible de glisser dans le corps creux 22. Le contact électrique entre le piston 25 et le corps du filtre hyperfréquence est obtenu par l'intermédiaire du corps 22 au moyen d'un embout 26 formant pinces et prolongeant la partie intermédiaire du piston 25.FIG. 5 represents an embodiment of a variable capacity tuning device particularly intended for so-called "frequency agile" filters, that is to say capable of passing rapidly from one tuning frequency to another within a determined range. The fixed finger 10, the body 22 of the movable finger and the nut 21 which is linked to it are the same as those of the embodiment of FIG. 2, except that the interior of the body 22 is smooth and not threaded. On the other hand, the mobile plunger 25 has the shape of a smooth piston capable of sliding in the hollow body 22. The electrical contact between the piston 25 and the body of the microwave filter is obtained by means of the body 22 by means of a tip 26 forming clamps and extending the intermediate part of the piston 25.

Comme dans les modes de réalisation décrits ci-dessus la forme extérieure présentée par le dispositif d'accord à capacité variable est invariable quelle que soit la fréquence d'accord. Par conséquent dans toute la gamme de fréquence d'accord, le couplage du résonateur au résonateur voisin ou aux accès du filtre ne varie pas en fonction de la fréquence d'accord. De même, la bande passante est quasi-indépendante de la fréquence d'accord.As in the embodiments described above, the external shape presented by the variable capacity tuning device is invariable regardless of the tuning frequency. Consequently, throughout the tuning frequency range, the coupling of the resonator to the neighboring resonator or to the ports of the filter does not vary as a function of the tuning frequency. Similarly, the bandwidth is almost independent of the frequency this okay.

Il est à noter de plus que les modes de réalisation du dispositif d'accord à capacité variable décrits ci-dessus conduisent à des filtres très faciles à compenser en température. En effet, la variation de la fréquence d'accord étant une fonction linéaire de l'enfoncement du plongeur d'accord, et les allongements des différents éléments mécaniques constituant les éléments capacitifs suivant également des lois linéaires, les matériaux et les dimensions des éléments les uns par rapport aux autres peuvent être choisis de manière assez simple pour que la compensation du filtre en température puisse être réalisée dans toute la gamme d'accord. Ainsi le coefficient de surtension reste élevé dans toute la gamme de fréquences du filtre. Du fait que le petit plongeur a un diamètre faible par rapport au diamètre extérieur des deux doigts, la course du plongeur est grande par rapport aux modes de réalisation antérieurs et le réglage du filtre en est largement facilité. La résolution en est également largement améliorée.It should also be noted that the embodiments of the variable capacity tuning device described above lead to filters which are very easy to compensate for in temperature. Indeed, the variation of the tuning frequency being a linear function of the depression of the tuning plunger, and the elongations of the different mechanical elements constituting the capacitive elements also following linear laws, the materials and the dimensions of the elements relative to each other can be chosen in a fairly simple manner so that the temperature filter compensation can be achieved throughout the entire tuning range. Thus the overvoltage coefficient remains high throughout the frequency range of the filter. Because the small plunger has a small diameter compared to the outside diameter of the two fingers, the stroke of the plunger is large compared to the previous embodiments and the adjustment of the filter is greatly facilitated. The resolution is also greatly improved.

L'invention n'est pas limitée aux modes de réalisation décrits et représentés. En particulier les formes extérieures du doigt fixe et du doigt mobile ne sont pas limitées aux formes décrites à titre d'exemple non limitatif en référence aux figures 1, 2, 3 et 4 (la figure 5 reprenant en cela la forme représentée sur la figure 2). Les formes sont déterminées à partir de la capacité minimale à réaliser, en particulier en liaison avec le diamètre des doigts et les dimensions des guides dans lesquels les dispositifs d'accord sont placés pour réaliser les filtres.The invention is not limited to the embodiments described and shown. In particular, the external shapes of the fixed finger and of the movable finger are not limited to the shapes described by way of nonlimiting example with reference to FIGS. 1, 2, 3 and 4 (FIG. 5 taking up the form shown in the figure 2). The shapes are determined from the minimum capacity to be produced, in particular in relation to the diameter of the fingers and the dimensions of the guides in which the tuning devices are placed to produce the filters.

De plus, pour les filtres agiles en fréquence, il est possible d'utiliser un petit plongeur mobile en forme de piston du type de celui décrit en référence à la figure 5 à la place du plongeur mobile 23 utilisé dans les modes de réalisation des figures 2, 3 et 4 pour réaliser des filtres agiles dont les gammes de fréquence sont plus ou moins hautes.In addition, for frequency agile filters, it is possible to use a small mobile plunger in the shape of a piston of the type described with reference to FIG. 5 in place of the mobile plunger 23 used in the embodiments of the figures. 2, 3 and 4 to produce agile filters with higher or lower frequency ranges.

Par ailleurs, le doigt fixe a été, dans tous les modes de réalisation décrits, choisi comme étant le doigt creux, le doigt mobile dans le corps du filtre étant le doigt comportant le plongeur d'accord. Il est bien sûr possible de faire le contraire, le doigt mobile par rapport au corps du filtre étant alors le doigt creux et le doigt fixe étant alors le doigt comportant le plongeur d'accord, le plongeur d'accord étant alors mobile dans un doigt fixe.Furthermore, the fixed finger was, in all the embodiments described, chosen as being the hollow finger, the movable finger in the body of the filter being the finger comprising the tuning plunger. It is of course possible to do the opposite, the finger movable relative to the body of the filter then being the hollow finger and the fixed finger then being the finger comprising the chord plunger, the chord plunger then being movable in a finger fixed.

L'invention a également pour objet un filtre hyperfréquence accordable comportant au moins un tel dispositif d'accord à capacité variable, ce filtre pouvant être un filtre du type en guide d'onde à mode évanescent ou un filtre du type à ligne TEM comportant des éléments capacitifs localisés.The invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity, this filter can be a filter of the waveguide type in evanescent mode or a filter of the TEM line type comprising Localized capacitive elements.

Claims (10)

1. Dispositif d'accord à capacité variable, pour filtre hyperfréquence accordable, comportant deux doigts coaxiaux, un premier doigt (10) étant creux et le second (20) comportant un plongeur déplaçable par rapport au doigt creux, entre une position d'enfoncement minimum où le plongeur et le doigt creux n'ont pas de surfaces en regard et une position d'enfoncement maximum où le plongeur et le doigt creux ont des surfaces en regard maximum, pour déterminer une variation de capacité, caractérisé en ce que le plongeur a un diamètre très inférieur au diamètre extérieur du doigt creux et en ce que le second doigt comporte en outre un corps comportant au moins une partie cylindrique de même diamètre qu'une partie cylindrique du premier doigt, destinée à lui faire face, ces deux parties étant déplaçables l'une par rapport à l'autre, la distance variable (d) entre les surfaces planes en regard correspondantes déterminant une seconde fraction de la capacité variable.1. Tuning device with variable capacity, for tunable microwave filter, comprising two coaxial fingers, a first finger (10) being hollow and the second (20) comprising a plunger movable relative to the hollow finger, between a depressed position minimum where the plunger and the hollow finger have no facing surfaces and a maximum insertion position where the plunger and the hollow finger have maximum facing surfaces, to determine a variation in capacity, characterized in that the plunger has a diameter much smaller than the outside diameter of the hollow finger and in that the second finger further comprises a body comprising at least one cylindrical part of the same diameter as a cylindrical part of the first finger, intended to face it, these two parts being movable relative to each other, the variable distance (d) between the corresponding facing planar surfaces determining a second fraction of the variable capacity. 2. Dispositif d'accord selon la revendication 1, caractérisé en ce que le second doigt (20) formé d'un corps et d'un plongeur est monobloc, le déplacement du plongeur par rapport au doigt creux étant obtenu par déplacement du doigt mobile dans son ensemble, les deux variations de capacité étant liées.2. Tuning device according to claim 1, characterized in that the second finger (20) formed of a body and a plunger is in one piece, the displacement of the plunger relative to the hollow finger being obtained by displacement of the movable finger as a whole, the two variations in capacity being linked. 3. Dispositif d'accord selon la revendication 1, caractérisé en ce que le plongeur du second doigt est mobile par rapport au corps creux (22) de ce même doigt suivant leur axe commun pour réaliser la première fraction de capacité variable par enfoncement du plongeur dans le doigt creux, la capacité minimale étant ajustée, lorsque le plongeur est en position d'enfoncement minimum, par ajustement de la distance entre les doigts en déplaçant l'un des deux doigts dans son ensemble, dans le corps du filtre.3. Tuning device according to claim 1, characterized in that the plunger of the second finger is movable relative to the hollow body (22) of the same finger along their common axis to produce the first fraction of variable capacity by depressing the plunger in the hollow finger, the minimum capacity being adjusted, when the plunger is in the minimum insertion position, by adjusting the distance between the fingers by moving one of the two fingers as a whole, in the body of the filter. 4. Dispositif d'accord selon la revendication 3, caractérisé en ce que le second doigt comportant le plongeur mobile est le doigt mobile.4. Tuning device according to claim 3, characterized in that the second finger comprising the movable plunger is the movable finger. 5. Dispositif d'accord selon la revendication 3, caractérisé en ce que le doigt creux est le doigt mobile.5. Tuning device according to claim 3, characterized in that the hollow finger is the movable finger. 6. Dispositif d'accord selon l'une quelconque des revendications 3 à 5, caractérisé en ce que le corps creux (22) du second doigt a une surface interne filetée, la surface externe du plongeur (23) étant également filetée et la variation d'enfoncement étant obtenue par vissage du plongeur dans le corps creux correspondant.6. Tuning device according to any one of claims 3 to 5, characterized in that the hollow body (22) of the second finger has a threaded internal surface, the external surface of the plunger (23) also being threaded and the variation being driven by screwing the plunger into the corresponding hollow body. 7. Dispositif d'accord selon l'une quelconque des revendications 3 à 5, caractérisé en ce que la surface interne du corps creux (22) du second doigt est lisse, le plongeur ayant la forme d'un piston (25) susceptible de glisser dans le corps correspondant pour obtenir la variation d'enfoncement, des contacts à pinces (26) solidaires du plongeur venant en appui sur la surface interne du corps creux pour assurer le contact électrique entre le plongeur (25) et le corps creux (22).7. Tuning device according to any one of claims 3 to 5, characterized in that the internal surface of the hollow body (22) of the second finger is smooth, the plunger having the shape of a piston (25) capable of slide into the corresponding body to obtain the depressing variation, clamp contacts (26) integral with the plunger bearing on the internal surface of the hollow body to ensure electrical contact between the plunger (25) and the hollow body (22 ). 8. Dispositif d'accord selon l'une quelconque des revendications 3 à 7, caractérisé en ce que les extrémités du premier et du second doigt ont des formes complémentaires de telle manière que l'un des doigts pénètre dans l'autre, leurs surfaces en regard étant formées de surfaces cylindriques et de surfaces planes déterminant par leur distance ajustable, leurs dimensions et leurs formes, la capacité minimale du dispositif d'accord ainsi formé.8. Tuning device according to any one of claims 3 to 7, characterized in that the ends of the first and second fingers have complementary shapes so that one of the fingers penetrates into the other, their surfaces facing being formed by cylindrical surfaces and flat surfaces determining by their adjustable distance, their dimensions and their shapes, the minimum capacity of the tuning device thus formed. 9. Dispositif d'accord selon l'une quelconque des revendications 3 à 7, caractérisé en ce que les extrémités du premier et du second doigt ont la même forme et déterminent, par la distance ajustable entre leurs surfaces planes en regard, la capacité minimale du dispositif d'accord ainsi réalisé.9. Tuning device according to any one of claims 3 to 7, characterized in that the ends of the first and of the second finger have the same shape and determine, by the adjustable distance between their planar facing surfaces, the minimum capacity of the tuning device thus produced. 10. Filtre hyperfréquence accordable comportant au moins un dispositif d'accord à capacité variable selon l'une quelconque des revendications précédentes.10. Tunable microwave filter comprising at least one variable capacity tuning device according to any one of the preceding claims.
EP81400240A 1980-03-04 1981-02-17 Tuning device with variable capacity and tunable microwave filter with at least one such device Expired EP0035922B1 (en)

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FR8004833A FR2477783A1 (en) 1980-03-04 1980-03-04 VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE
FR8004833 1980-03-04

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EP0035922A1 true EP0035922A1 (en) 1981-09-16
EP0035922B1 EP0035922B1 (en) 1984-06-20

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JP (1) JPS56136001A (en)
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IT202100012983A1 (en) * 2021-05-19 2022-11-19 Commscope Italy Srl FIXING ELEMENT FOR THE RESONATOR OF A RADIOFREQUENCY FILTER

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Cited By (12)

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EP0068919A1 (en) * 1981-06-02 1983-01-05 Thomson-Csf Microwave resonator of the variable capacitor type, comprising dielectric material
EP0125450A2 (en) * 1983-05-16 1984-11-21 Northern Telecom Limited Microwave cavity tuner
EP0125450A3 (en) * 1983-05-16 1985-11-13 Northern Telecom Limited Microwave cavity tuner
EP0346806A1 (en) * 1988-06-17 1989-12-20 Alcatel Telspace Band-pass-filter with dielectric resonators
FR2633118A1 (en) * 1988-06-17 1989-12-22 Alcatel Thomson Faisceaux DIELECTRIC RESONATOR PASSER FILTER
EP0392372A2 (en) * 1989-04-10 1990-10-17 Alcatel N.V. TEM coaxial resonator
EP0392372A3 (en) * 1989-04-10 1992-01-15 Alcatel N.V. Tem coaxial resonator
EP2833473A1 (en) * 2012-04-28 2015-02-04 Huawei Technologies Co., Ltd. Adjustable filter and duplexer comprising the adjustable filter
EP2833473A4 (en) * 2012-04-28 2015-04-15 Huawei Tech Co Ltd Adjustable filter and duplexer comprising the adjustable filter
US9647307B2 (en) 2012-04-28 2017-05-09 Huawei Technologies Co., Ltd. Tunable filter and duplexer including filter
ES2688214A1 (en) * 2018-05-30 2018-10-31 Universitat Politècnica De València MICROWAVE FILTERING AND SWITCHING DEVICE (Machine-translation by Google Translate, not legally binding)
WO2019229282A1 (en) * 2018-05-30 2019-12-05 Universitat Politècnica De València Device for filtering and switching microwaves

Also Published As

Publication number Publication date
FR2477783A1 (en) 1981-09-11
US4380747A (en) 1983-04-19
DE3164252D1 (en) 1984-07-26
EP0035922B1 (en) 1984-06-20
FR2477783B1 (en) 1984-09-21
JPS6151442B2 (en) 1986-11-08
JPS56136001A (en) 1981-10-23

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