EP0101369A1 - Band-pass filter with dielectric resonators presenting negative coupling between resonators - Google Patents

Band-pass filter with dielectric resonators presenting negative coupling between resonators Download PDF

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Publication number
EP0101369A1
EP0101369A1 EP83401602A EP83401602A EP0101369A1 EP 0101369 A1 EP0101369 A1 EP 0101369A1 EP 83401602 A EP83401602 A EP 83401602A EP 83401602 A EP83401602 A EP 83401602A EP 0101369 A1 EP0101369 A1 EP 0101369A1
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EP
European Patent Office
Prior art keywords
resonators
filter
coupling
common wall
rod
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Granted
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EP83401602A
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German (de)
French (fr)
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EP0101369B1 (en
Inventor
Jean-Luc Etienne
Charif Nasrallah
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Alcatel Thomson Faisceaux Hertziens SA
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Alcatel Thomson Faisceaux Hertziens SA
Thomson CSF SA
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Application filed by Alcatel Thomson Faisceaux Hertziens SA, Thomson CSF SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Priority to AT83401602T priority Critical patent/ATE34488T1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/219Evanescent mode filters

Definitions

  • the present invention relates to filters with dielectric resonators in which at least one negative coupling is produced between two resonators; these filters have amplitude frequency curves which make them call, depending on the case, elliptical or pseudo-elliptical filters or flat bandpass filters.
  • Such filters are known; an article entitled "Generalized dielectric resonator filters” (see Comsat technical review, volume 11, number 4 of 1981 - pages 321-343) describes filters comprising cavities, the bottom of which is covered with a guide 'ribbon waves (stripline in Anglo-Saxon literature), common to the cavities and, in each of these cavities, a dielectric resonator isolated from the ribbon waveguide by a dielectric support; the walls common to two cavities do not descend to the ribbon waveguide so as not to create short circuits.
  • the coupling between resonators is obtained by means of the ribbon guide which for this includes quarter wave lines and three quarter wave lines whose ends are arranged under the resonators to be coupled.
  • the no-load overvoltage coefficient of these filters does not exceed, for example, 3,500 to 4.7 GHz due, in particular, to the TE O11 resonance mode used for the resonators.
  • the purpose of the present invention has been mainly to provide a filter with dielectric resonators having at least one negative coupling and having an overvoltage coefficient significantly higher than the coefficient indicated above.
  • a resonator filter comprising a rectangular waveguide and n dielectric resonators (n at least equal to 4) arranged inside the guide, in which a negative coupling is produced between two of the n resonators, is characterized in that the waveguide operates below its cut-off frequency and is folded back on itself with a wall common to its two folded parts, the two negatively coupled resonators being located on either side of the common wall, the dimensions of the cross section of the guide being of the order of 2 to 2.5 times the transverse dimensions of the resonators, and in that it comprises a coupling rod for carrying out the negative coupling, this rod passing through the common wall through a hole and being, at least outside its ends, electrically separated from the common wall.
  • FIG. 1 shows a filter according to the invention cover removed.
  • This filter is a bandpass filter with dielectric resonators, of which the 6 resonators, Rl-R6, are arranged in series in a rectangular waveguide folded into a U which forms the housing, 1, of the filter.
  • the ports A1, A2 of this filter are constituted by two sockets with antennas, disposed respectively at the two ends of the filter.
  • the dimensions of the cross section of the guide are taken from the order 2 to 2.5 times larger than the transverse dimensions of the resonators, in this case it is about 2.2.
  • the access antennas AI, A2 are directed in the direction of propagation in the guide.
  • a negative coupling between two non-adjacent resonators R 1 and R5
  • a coupling by conducting rod, 20 is carried out through the common wall, 2, which separates the two folded parts constituting the U-shaped guide.
  • Three exemplary embodiments of the coupling by rod 20 will be given with the aid of FIGS. 3 to 5.
  • the filter housing according to FIG. 1 is assembled by means of screws which pass through the not shown cover of the filter to be screwed into six tapped holes, such as 10, drilled in the filter housing.
  • FIG. 2 is a diagram showing the distribution of the electromagnetic field around a resonator R for a resonance mode of the TMO11 type; the electric field lines, E have been shown in thin dashed lines and lines of the magnetic field, H have been shown in thin solid lines.
  • the TM011 resonance mode which has been chosen for the resonators of FIG. 1 makes it possible to obtain, with the filter according to this FIG. 1, a high overvoltage coefficient, greater than 4,000.
  • Figure 3 is a sectional view, along the axis XX shown in Figure 1, of the filter according to Figure 1.
  • the resonators R2 and R5 as elsewhere the other resonators of the filter, are bonded to a support (S2 for R2 and 55 for R5) and this support is itself glued to the bottom of the waveguide.
  • the supports of the resonators, such as S2 and S5, are made of a dielectric material of dielectric constant equal to 2.5 while the dielectric constant of the dielectric resonators such as R2 and R5 is equal to 36.
  • the coupling by rod is carried out by a rod 20 which ends in two antennas Ga, G'a arranged perpendicular to the wall 2 and halfway up this wall.
  • the two antennas G and G'a as they are placed in the vicinity of the resonators R2 and R5 produce a negative coupling, by the lines of the electric field, between these two resonators, that is to say that they bring back a part of the energy of the resonator R2 in phase opposition in the vicinity of the resonator R5 or vice versa.
  • This negative coupling makes it possible to bring back attenuation peaks on either side of the bandwidth of the filter in order to make the sides of the amplitude-frequency response curve of the filter considered stiffer.
  • FIG. 4 corresponds to a magnetic-magnetic coupling between the resonators R2 and R5; for this purpose the antennas Ga and G'a of FIG. 3 are replaced by two loops Gb, G'b produced by means of the rod 20 which is folded in the vicinity of its ends, so as to form two loops in a vertical plane and to come into contact, with its ends, on the wall 2.
  • the conductive rod 20 is in electrical contact with the wall 2 only at its ends, indeed both in the case of the example of Figure 3 than in that of Figure 4 and in that of Figure 5 which will be described later, the rod 20, when it passes through the wall 2, is electrically isolated.
  • FIG. 5 is an exemplary embodiment of the coupling by rod, 20, of FIG. 1 in which the coupling with the resonator R2 is an electrical coupling produced by means of a Ga antenna similar to that of FIG. 3 while the coupling with the resonator R5 is a magnetic coupling produced by means of a loop G'b similar to the loop G'b of FIG. 4.
  • the filter of FIG. 1 is a 6-pole filter constituted by the 6 resonators RI to R6, the filter which will now be described using the Figures 6 to 9, is a four-pole filter, designed on the same model as the filter according to Figure 1.
  • FIGs 6, 7 and 8 respectively show the filter housing, cover removed, the filter cover and a section of the filter with its cover; the cut is made according to the plane, the trace of which in FIG. 6 is denoted YY, and only the case 1 with its cover 3 is shown cut.
  • This four-pole filter is constituted by a rectangular waveguide folded into a U with in series in this waveguide four resonators RI to R4 and at the ends of the guide two accesses A1, A2 each constituted by a socket terminated on the side of the guide by a coupling antenna.
  • Figure 1 shows the threaded holes such as 11 which allow the fixing of the cover 3 on the housing 1 of the filter.
  • the filter according to FIGS. 6 to 8 is produced so as to make the resonators resonate according to the TM011 mode and to propagate in the guide a TM mode whose cutoff frequency is higher to that of the TM011 mode of the resonators.
  • This way of operating the filter makes it possible to obtain a very high no-load overvoltage coefficient; it requires, as has been seen previously, different conditions: the waveguide must operate below its cut-off frequency, the access antennas of the guide must be arranged in the direction of wave propagation in the guide, the resonators must be arranged in series in the guide and the resonators must have transverse dimensions of the order of 2 to 2.5 times smaller than the transverse dimensions of the waveguide considered.
  • FIGS. 7 and 8 show that, in addition to holes such as 10 for the passage of fixing screws for the cover 3 in the tapped holes 11 of the housing 1, the cover 3 has four other holes in which are fixed adjustment elements. resonance of the resonators, E1 to E4, and five tapped holes through which pass tuning screws V to V5.
  • the adjustment elements E1 to E4 are intended for adjusting the frequency of the resonators, they are arranged just above the resonators and are constituted by a dielectric disc which a screw also in dielectric allows by screwing in the cover 3 of approach or move away at will from the resonator above which the adjustment element is located.
  • the tuning screws V1 to V5 are metal screws intended to modify the couplings between, respectively, the antenna of access Al and the resonator RI, the resonators RI and R2, the resonators R2 and R3, the resonators R3 and R4 and the resonator R4 and the antenna of the access A2.
  • the filter shown in FIGS. 6 to 8 is a filter in which the dielectric resonators have a dielectric constant equal to 36.
  • This filter the dimensions of the housing of which are 71.70 x 62 x 30 mm, has been designed to operate in a bandwidth with a center frequency of 6,720 MHz; the amplitude-frequency response curve of this filter is given in FIG. 9.
  • Two curves are represented in FIG. 9: a curve CI indicated in broken lines which represents the response of the filter without coupling by the rod 20 and a curve C2 indicated in solid line which represents the response of the filter when the coupling by rod between the resonators RI and R4 is introduced. As shown in FIG.
  • the sides of the response curve of the filter have become much stiffer thanks to the negative coupling effect introduced by the rod, 20; it should also be noted that the bandwidth of the filter with the rod coupling is narrower than that without the coupling, this is due to the fact that the position of the resonators RI to R4 of FIG. 6 has been studied without the coupling 20 and was not subsequently modified when the rod 20 was introduced. It is possible to give the bandwidth (with the rod 20) a width substantially equivalent to that obtained initially (without the rod 20); for this it is necessary to redefine the position of the resonators in the guide and, subsequently, the position of the adjustment elements (El to E4) and of the tuning screws (VI to V5).
  • the invention is not limited to the examples described, this is how, for example, the number of resonators can be greater than six and can be equal to an odd number, for example five or seven, and that then the guide folded into a U is preferably folded so that a resonator is located substantially in the extension of the common wall, that is to say in the horizontal bar of the U. It is also possible to provide, for example in the case of FIG. 1, two couplings per rod: a first coupling as indicated in FIG. 1 which couples the resonators R2 and R5 and a second coupling which couples the resonators RI and R6.

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Abstract

1. A resonator filter comprising a rectangular waveguide (1-3) and n dielectric resonators (R1-R6) disposed inside the waveguide (with n being not less than 4), in which negative coupling is provided between two of the n resonators (R2, R5), the waveguide operating below its cutoff frequency, the filter being characterized in that the waveguide is folded back on itself with a wall (2) that is common between its two folded portions, the two negatively coupled resonators being situated on either side of the common wall, the dimensions of the cross-section of the waveguide being about 2 to 2.5 times the transverse dimensions of the resonators, and in that the filter includes a coupling rod (20) for providing the negative coupling, said rod passing through the common wall via a hole and being electrically separate from the common wall, at least apart from its ends.

Description

La présente invention se rapporte aux filtres à résonateurs diélectriques dans lesquels au moins un couplage négatif est réalisé entre deux résonateurs ; ces filtres ont des courbes amplitude fréquence qui les font appeler, selon les cas, filtres elliptiques ou pseudo-elliptiques ou filtres passe-bande méplats.The present invention relates to filters with dielectric resonators in which at least one negative coupling is produced between two resonators; these filters have amplitude frequency curves which make them call, depending on the case, elliptical or pseudo-elliptical filters or flat bandpass filters.

De tels filtres sont connus ; c'est ainsi qu'un article intitulé "Generalized dielectric resonator filters" (voir Comsat technical review, volume 11, numéro 4 de 1981 - pages 321-343) décrit des filtres comportant des cavités dont le fond est recouvert d'un guide d'ondes à rubans (stripline dans la littérature anglo-saxonne), commun aux cavités et, dans chacune de ces cavités, un résonateur diélectrique isolé du guide d'ondes à rubans par un support diélectrique ; les parois communes à deux cavités ne descendent pas jusqu'au guide d'ondes à rubans pour ne pas créer des courts-circuits. Dans ces filtres, le couplage entre résonateurs est obtenu grâce au guide à rubans qui comporte pour cela des lignes quart d'onde et des lignes trois quarts d'onde dont les extrémités sont disposées sous les résonateurs à coupler. Le coefficient de surtension à vide de ces filtres ne dépasse pas, par exemple, 3 500 à 4,7 GHz en raison, en particulier, du mode de résonance TE O11 utilisé pour les résonateurs.Such filters are known; an article entitled "Generalized dielectric resonator filters" (see Comsat technical review, volume 11, number 4 of 1981 - pages 321-343) describes filters comprising cavities, the bottom of which is covered with a guide 'ribbon waves (stripline in Anglo-Saxon literature), common to the cavities and, in each of these cavities, a dielectric resonator isolated from the ribbon waveguide by a dielectric support; the walls common to two cavities do not descend to the ribbon waveguide so as not to create short circuits. In these filters, the coupling between resonators is obtained by means of the ribbon guide which for this includes quarter wave lines and three quarter wave lines whose ends are arranged under the resonators to be coupled. The no-load overvoltage coefficient of these filters does not exceed, for example, 3,500 to 4.7 GHz due, in particular, to the TE O11 resonance mode used for the resonators.

Le but de la présente invention a été principalement, de proposer un filtre à résonateurs diélectriques présentant au moins un couplage négatif et ayant un coefficient de surtension nettement supérieur au coefficient indiqué ci-avant.The purpose of the present invention has been mainly to provide a filter with dielectric resonators having at least one negative coupling and having an overvoltage coefficient significantly higher than the coefficient indicated above.

Ce résultat est obtenu, en particulier, en utilisant un guide d'ondes rectangulaire replié sur lui-même, en lé faisant fonctionner au-dessous de sa fréquence de coupure et en effectuant le couplage négatif à travers la paroi commune aux deux parties repliées du guide.This result is obtained, in particular, by using a rectangular waveguide folded back on itself, by operating it below its cut-off frequency and by carrying out negative coupling through the wall common to the two folded parts of the guide.

Selon l'invention, un filtre à résonateurs comportant un guide d'ondes rectangulaire et n résonateurs diélectriques (n au moins égal à 4) disposés à l'intérieur du guide, dans lequel un couplage négatif est réalisé entre deux des n résonateurs, est caractérisé en ce que le guide d'ondes fonctionne au-dessous de sa fréquence de coupure et est replié sur lui-même avec une paroi commune à ses deux parties repliées, les deux résonateurs couplés négativement étant situés de part et d'autre de la paroi commune, les dimensions de la section transversale du guide étant de l'ordre de 2 à 2,5 fois les dimensions transversales des résonateurs, et en ce qu'il comporte une tige de couplage pour réaliser le couplage négatif, cette tige traversant la paroi commune à travers un trou et étant, au moins en dehors de ses extrémités, séparéeélectriquement de la paroi commune.According to the invention, a resonator filter comprising a rectangular waveguide and n dielectric resonators (n at least equal to 4) arranged inside the guide, in which a negative coupling is produced between two of the n resonators, is characterized in that the waveguide operates below its cut-off frequency and is folded back on itself with a wall common to its two folded parts, the two negatively coupled resonators being located on either side of the common wall, the dimensions of the cross section of the guide being of the order of 2 to 2.5 times the transverse dimensions of the resonators, and in that it comprises a coupling rod for carrying out the negative coupling, this rod passing through the common wall through a hole and being, at least outside its ends, electrically separated from the common wall.

La présente invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description ci-après et des figures s'y rapportant qui représentent :

  • - la figure 1, un filtre selon l'invention, capôt enlevé,
  • - la figure 2, un schéma montrant un résonateur diélectrique,
  • - les figures 3, 4 et 5 des vues en coupe relatives au filtre selon la figure 1,
  • - les figures 6 à 8 différentes vues d'un second filtre selon l'invention,
  • - la figure 9 des résultats graphiques relatifs au filtre selon la figure 6.
The present invention will be better understood and other characteristics will appear with the aid of the description below and of the figures relating thereto which represent:
  • FIG. 1, a filter according to the invention, hood removed,
  • FIG. 2, a diagram showing a dielectric resonator,
  • FIGS. 3, 4 and 5 are sectional views relating to the filter according to FIG. 1,
  • FIGS. 6 to 8 different views of a second filter according to the invention,
  • - Figure 9 of the graphical results relating to the filter according to Figure 6.

Sur les différentes figures les éléments correspondants sont désignés par les mêmes repères.In the various figures, the corresponding elements are designated by the same references.

La figure 1 montre un filtre selon l'invention couvercle enlevé. Ce filtre est un filtre passe-bande à résonateurs diélectriques, dont les 6 résonateurs, Rl-R6, sont disposés en série dans un guide d'ondes rectangulaire replié en U qui forme le boîtier, 1, du filtre. Les accès Al, A2 de ce filtre sont constitués par deux prises avec antennes, disposées respectivement aux deux extrémités du filtre. De manière à faire résonner les résonateurs selon le mode TM011 et à faire propager dans le guide un mode TM dont la fréquence de coupure soit supérieure à celle du mode TM011 des résonateurs, les dimensions de la section transversale du guide sont prises de l'ordre de 2 à 2,5 fois plus grandes que les dimensions transversales des résonateurs, dans le cas présent il est question de 2,2. Par ailleurs les antennes des accès AI, A2 sont dirigées selon la direction de la propagation dans le guide.Figure 1 shows a filter according to the invention cover removed. This filter is a bandpass filter with dielectric resonators, of which the 6 resonators, Rl-R6, are arranged in series in a rectangular waveguide folded into a U which forms the housing, 1, of the filter. The ports A1, A2 of this filter are constituted by two sockets with antennas, disposed respectively at the two ends of the filter. In order to make the resonators resonate according to the TM011 mode and to propagate in the guide a TM mode whose cut-off frequency is higher than that of the TM011 mode of the resonators, the dimensions of the cross section of the guide are taken from the order 2 to 2.5 times larger than the transverse dimensions of the resonators, in this case it is about 2.2. Furthermore, the access antennas AI, A2 are directed in the direction of propagation in the guide.

De manière à créer dans le filtre selon la figure 1 un couplage négatif entre deux résonateurs non-adjacents (R 1 et R5) un couplage par tige conductrice, 20, est réalisé à travers la paroi commune, 2, qui sépare les deux parties repliées constituant le guide en U. Trois exemples de réalisation du couplage par tige 20 seront donnés à l'aide des figures 3 à 5.So as to create in the filter according to FIG. 1 a negative coupling between two non-adjacent resonators (R 1 and R5) a coupling by conducting rod, 20, is carried out through the common wall, 2, which separates the two folded parts constituting the U-shaped guide. Three exemplary embodiments of the coupling by rod 20 will be given with the aid of FIGS. 3 to 5.

Le boîtier du filtre selon la figure 1 est assemblé au moyen de vis qui traversent le couvercle non représenté du filtre pour venir se visser dans six trous taraudés, tels que 10, percés dans le boîtier du filtre.The filter housing according to FIG. 1 is assembled by means of screws which pass through the not shown cover of the filter to be screwed into six tapped holes, such as 10, drilled in the filter housing.

La figure 2 est un schéma montrant la répartition du champ électromagnétique autour d'un résonateur R pour un mode de résonance du type TMO11 ; les lignes du champ électrique, E ont été représentées en traits interrompus fins et les lignes du champ magnétique, H ont été représentées en traits continus fins. Le mode de résonance TM011 qui a été choisi pour les résonateurs de la figure 1 permet d'obtenir, avec le filtre selon cette figure 1, un coefficient de surtension élevé, supérieure à 4 000.FIG. 2 is a diagram showing the distribution of the electromagnetic field around a resonator R for a resonance mode of the TMO11 type; the electric field lines, E have been shown in thin dashed lines and lines of the magnetic field, H have been shown in thin solid lines. The TM011 resonance mode which has been chosen for the resonators of FIG. 1 makes it possible to obtain, with the filter according to this FIG. 1, a high overvoltage coefficient, greater than 4,000.

La figure 3, est une vue en coupe, selon l'axe XX indiqué sur la figure 1, du filtre selon la figure 1. Les résonateurs R2 et R5 comme d'ailleurs les autres résonateurs du filtre, sont collés sur un support (S2 pour R2 et 55 pour R5) et ce support est lui-même collé sur le fond du guide d'ondes. Les supports des résonateurs, tels que S2 et S5, sont réalisés en un matériau diélectrique de constante diélectrique égale à 2,5 alors que la constante diélectrique des résonateurs diélectriques tels que R2 et R5 est égale à 36. Dans le cas de la figure 3 le couplage par tige est réalisé par une tige 20 qui se termine par deux antennes Ga, G'a disposées perpendiculairement à la paroi 2 et à mi-hauteur de cette paroi. Les deux antennes G et G'a telles qu'elles sont placées au voisinage des résonateurs R2 et R5 réalisent un couplage négatif, par les lignes du champ électrique, entre ces deux résonateurs, c'est-à-dire qu'elles ramènent une partie de l'énergie du résonateur R2 en opposition de phase au voisinage du résonateur R5 ou inversement. Ce couplage négatif permet de ramener des pointes d'affaiblissement de part et d'autre de la bande passante du filtre afin de rendre plus raides les flancs de la courbe de réponse amplitude-fréquence du filtre considéré.Figure 3 is a sectional view, along the axis XX shown in Figure 1, of the filter according to Figure 1. The resonators R2 and R5 as elsewhere the other resonators of the filter, are bonded to a support (S2 for R2 and 55 for R5) and this support is itself glued to the bottom of the waveguide. The supports of the resonators, such as S2 and S5, are made of a dielectric material of dielectric constant equal to 2.5 while the dielectric constant of the dielectric resonators such as R2 and R5 is equal to 36. In the case of FIG. 3 the coupling by rod is carried out by a rod 20 which ends in two antennas Ga, G'a arranged perpendicular to the wall 2 and halfway up this wall. The two antennas G and G'a as they are placed in the vicinity of the resonators R2 and R5 produce a negative coupling, by the lines of the electric field, between these two resonators, that is to say that they bring back a part of the energy of the resonator R2 in phase opposition in the vicinity of the resonator R5 or vice versa. This negative coupling makes it possible to bring back attenuation peaks on either side of the bandwidth of the filter in order to make the sides of the amplitude-frequency response curve of the filter considered stiffer.

La figure 3, qui vient d'être décrite, correspond à un couplage électrique-électrique entre les résonateurs R2 et R5. La figure 4 correspond à un couplage magnétique-magnétique entre les résonateurs R2 et R5 ; à cet effet les antennes Ga et G'a de la figure 3 sont remplacées par deux boucles Gb, G'b réalisées grâce à la tige 20 qui est repliée au voisinage de ses extrémités, de manière à former deux boucles dans un plan vertical et à venir en contact, avec ses extrémités, sur la paroi 2. Il est à noter que la tige conductrice 20 n'est en contact électrique avec la paroi 2 qu'à ses extrémités, en effet aussi bien dans le cas de l'exemple de la figure 3 que dans celui de la figure 4 et dans celui de la figure 5 qui sera décrit après, la tige 20, quand elle traverse la paroi 2, en est électriquement isolée.FIG. 3, which has just been described, corresponds to an electrical-electrical coupling between the resonators R2 and R5. FIG. 4 corresponds to a magnetic-magnetic coupling between the resonators R2 and R5; for this purpose the antennas Ga and G'a of FIG. 3 are replaced by two loops Gb, G'b produced by means of the rod 20 which is folded in the vicinity of its ends, so as to form two loops in a vertical plane and to come into contact, with its ends, on the wall 2. It should be noted that the conductive rod 20 is in electrical contact with the wall 2 only at its ends, indeed both in the case of the example of Figure 3 than in that of Figure 4 and in that of Figure 5 which will be described later, the rod 20, when it passes through the wall 2, is electrically isolated.

La figure 5 est un exemple de réalisation du couplage par tige, 20, de la figure 1 dans lequel le couplage avec le résonateur R2 est un couplage électrique réalisé au moyen d'une antenne Ga semblable à celle de la figure 3 alors que le couplage avec le résonateur R5 est un couplage magnétique réalisé au moyen d'une boucle G'b semblable à la boucle G'b de la figure 4.FIG. 5 is an exemplary embodiment of the coupling by rod, 20, of FIG. 1 in which the coupling with the resonator R2 is an electrical coupling produced by means of a Ga antenna similar to that of FIG. 3 while the coupling with the resonator R5 is a magnetic coupling produced by means of a loop G'b similar to the loop G'b of FIG. 4.

Il est à noter que théoriquement, vu la répartition des lignes du champ magnétique tel que représenté sur la figure 2, les couplages magnétiques par les boucles Gb et G'b des figures 4 et 5 ne peut se faire que si les boucles Gb et G'b sont disposées dans un plan vertical ; en pratique il apparaît qu'il est également possible de réaliser ce couplage magnétique avec des boucles disposées différemment et même disposées dans un plan horizontal ; ceci est du au fait que le champ magnétique, H, ne se présente pas exactement comme il est indiqué sur la figure 2 et qu'il subit des déformations dues à la proximité des parois du guide d'ondes si bien qu'une boucle de couplage disposée dans un plan parallèle au fond du boîtier du filtre est quand même traversée par une partie du champ magnétique.It should be noted that theoretically, given the distribution of the lines of the magnetic field as shown in Figure 2, the magnetic couplings by the loops Gb and G'b of Figures 4 and 5 can only be done if the loops Gb and G 'b are arranged in a vertical plane; in practice it appears that it is also possible to carry out this magnetic coupling with loops arranged differently and even arranged in a horizontal plane; this is due to the fact that the magnetic field, H, does not present itself exactly as indicated in FIG. 2 and that it undergoes deformations due to the proximity of the walls of the waveguide so that a loop of a coupling arranged in a plane parallel to the bottom of the filter housing is nevertheless crossed by a part of the magnetic field.

Le filtre de la figure 1 est un filtre à 6 pôles constitués par les 6 résonateurs RI à R6, le filtre qui va être décrit maintenant à l'aide des figures 6 à 9, est un filtre à quatre pôles, conçu sur le même modèle que le filtre selon la figure 1.The filter of FIG. 1 is a 6-pole filter constituted by the 6 resonators RI to R6, the filter which will now be described using the Figures 6 to 9, is a four-pole filter, designed on the same model as the filter according to Figure 1.

Les figures 6, 7 et 8 montrent respectivement le boîtier du filtre, couvercle enlevé, le couvercle du filtre et une coupe du filtre avec son couvercle ; la coupe est réalisée selon le plan dont la trace dans la figure 6 est notée YY, et seuls le boîtier 1 avec son couvercle 3 sont représentés coupés. Ce filtre à quatre pôles est constitué par un guide d'ondes rectangulaire replié en U avec en série dans ce guide d'ondes quatre résonateurs RI à R4 et aux extrémités du guide deux accès Al, A2 constitués chacun par une prise terminée du côté du guide par une antenne de couplage. La figure 1 montre les trous taraudés tels que 11 qui permettent la fixation du couvercle 3 sur le boîtier 1 du filtre.Figures 6, 7 and 8 respectively show the filter housing, cover removed, the filter cover and a section of the filter with its cover; the cut is made according to the plane, the trace of which in FIG. 6 is denoted YY, and only the case 1 with its cover 3 is shown cut. This four-pole filter is constituted by a rectangular waveguide folded into a U with in series in this waveguide four resonators RI to R4 and at the ends of the guide two accesses A1, A2 each constituted by a socket terminated on the side of the guide by a coupling antenna. Figure 1 shows the threaded holes such as 11 which allow the fixing of the cover 3 on the housing 1 of the filter.

Comme dans l'exemple précédent représenté sur la figure 1, le filtre selon les figures 6 à 8 est réalisé de manière à faire résonner les résonateurs selon le mode TM011 et à faire propager dans le guide un mode TM dont la fréquence de coupure soit supérieure à celle du mode TM011 des résonateurs. Cette façon de faire fonctionner le filtre permet d'obtenir un coefficient de surtension à vide très élevé ; elle nécessite comme il a été vu précédemment différentes conditions : le guide d'ondes doit fonctionner au-dessous de sa fréquence de coupure, les antennes des accès du guide doivent être disposées selon la direction de propagation des ondes dans le guide, les résonateurs doivent être disposés en série dans le guide et les résonateurs doivent présenter des dimensions transversales de l'ordre de 2 à 2,5 fois plus petits que les dimensions transversales du guide d'ondes considéré.As in the previous example shown in FIG. 1, the filter according to FIGS. 6 to 8 is produced so as to make the resonators resonate according to the TM011 mode and to propagate in the guide a TM mode whose cutoff frequency is higher to that of the TM011 mode of the resonators. This way of operating the filter makes it possible to obtain a very high no-load overvoltage coefficient; it requires, as has been seen previously, different conditions: the waveguide must operate below its cut-off frequency, the access antennas of the guide must be arranged in the direction of wave propagation in the guide, the resonators must be arranged in series in the guide and the resonators must have transverse dimensions of the order of 2 to 2.5 times smaller than the transverse dimensions of the waveguide considered.

Les figure 7 et 8 montrent que, outre des trous tels que 10 pour le passage de vis de fixation du couvercle 3 dans les trous taraudés 11 du boîtier 1, le couvercle 3 comporte quatre autres trous dans lesquels sont fixés des éléments de réglage de la résonance des résonateurs, El à E4, et cinq trous taraudés à travers lesquels passent des vis d'accord V à V5. Les éléments de réglage El à E4 sont destinés au réglage de la fréquence des résonateurs, ils sont disposés juste au-dessus des résonateurs et sont constitués par un disque en diélectrique qu'une vis également en diélectrique permet par vissage dans le couvercle 3 d'approcher ou d'écarter à volonté du résonateur au-dessus duquel se trouve l'élément de réglage. Les vis d'accord V1 à V5 sont des vis métalliques destinées à permettre de modifier les couplages entre, respectivement, l'antenne de l'accès Al et le résonateur RI, les résonateurs RI et R2, les résonateurs R2 et R3, les résonateurs R3 et R4 et le résonateur R4 et l'antenne de l'accès A2.FIGS. 7 and 8 show that, in addition to holes such as 10 for the passage of fixing screws for the cover 3 in the tapped holes 11 of the housing 1, the cover 3 has four other holes in which are fixed adjustment elements. resonance of the resonators, E1 to E4, and five tapped holes through which pass tuning screws V to V5. The adjustment elements E1 to E4 are intended for adjusting the frequency of the resonators, they are arranged just above the resonators and are constituted by a dielectric disc which a screw also in dielectric allows by screwing in the cover 3 of approach or move away at will from the resonator above which the adjustment element is located. The tuning screws V1 to V5 are metal screws intended to modify the couplings between, respectively, the antenna of access Al and the resonator RI, the resonators RI and R2, the resonators R2 and R3, the resonators R3 and R4 and the resonator R4 and the antenna of the access A2.

Le filtre représenté sur les figures 6 à 8 est un filtre dans lequel les résonateurs diélectrique ont une constante diélectrique égale à 36. Ce filtre, dont les dimensions du boîtier sont 71,70 x 62 x 30 mm, a été conçu pour fonctionner dans une bande passante dont la fréquence centrale est de 6 720 MHz ; la courbe de réponse amplitude-fréquence de ce filtre est donnée sur la figure 9. Deux courbes sont représentées sur la figure 9 : une courbe CI indiquée en trait interrompu qui représente la réponse du filtre sans le couplage par la tige 20 et une courbe C2 indiquée en trait plein qui représente la réponse du filtre lorsqu'est introduit le couplage par tige entre les résonateurs RI et R4. Comme il apparaît sur la figure 9 les flancs de la courbe de réponse du filtre sont devenus beaucoup plus raides grâce à l'effet de couplage négatif introduit par la tige, 20 ; il est également à noter que la bande passante du filtre avec le couplage par tige est plus étroite que celle sans le couplage, ceci est du au fait que la position des résonateurs RI à R4 de la figure 6 a été étudiée sans le couplage 20 et n'a pas été modifiée ensuite lorsque la tige 20 a été introduite. Il est possible de donner à la bande passante (avec la tige 20) une largeur sensiblement équivalente à celle obtenue initialement (sans la tige 20) ; pour cela il faut redéfinir la position des résonateurs dans le guide et, par la suite, la position des éléments de réglage (El à E4) et des vis d'accord (VI à V5).The filter shown in FIGS. 6 to 8 is a filter in which the dielectric resonators have a dielectric constant equal to 36. This filter, the dimensions of the housing of which are 71.70 x 62 x 30 mm, has been designed to operate in a bandwidth with a center frequency of 6,720 MHz; the amplitude-frequency response curve of this filter is given in FIG. 9. Two curves are represented in FIG. 9: a curve CI indicated in broken lines which represents the response of the filter without coupling by the rod 20 and a curve C2 indicated in solid line which represents the response of the filter when the coupling by rod between the resonators RI and R4 is introduced. As shown in FIG. 9, the sides of the response curve of the filter have become much stiffer thanks to the negative coupling effect introduced by the rod, 20; it should also be noted that the bandwidth of the filter with the rod coupling is narrower than that without the coupling, this is due to the fact that the position of the resonators RI to R4 of FIG. 6 has been studied without the coupling 20 and was not subsequently modified when the rod 20 was introduced. It is possible to give the bandwidth (with the rod 20) a width substantially equivalent to that obtained initially (without the rod 20); for this it is necessary to redefine the position of the resonators in the guide and, subsequently, the position of the adjustment elements (El to E4) and of the tuning screws (VI to V5).

L'invention n'est pas limitée aux exemples décrits, c'est ainsi que, par exemple, le nombre de résonateurs peut être supérieur à six et peut être égal à un nombre impair, par exemple cinq ou sept, et qu'alors le guide replié en U sera replié de préférence de telle façon qu'un résonateur se trouve sensiblement dans le prolongement de la paroi commune c'est-à-dire dans la barre horizontale du U. Il est également possible de prévoir, par exemple dans le cas de la figure 1, deux couplages par tige : un premier couplage tel qu'indiqué sur la figure 1 qui couple les résonateurs R2 et R5 et un deuxième couplage qui couple les résonateurs RI et R6.The invention is not limited to the examples described, this is how, for example, the number of resonators can be greater than six and can be equal to an odd number, for example five or seven, and that then the guide folded into a U is preferably folded so that a resonator is located substantially in the extension of the common wall, that is to say in the horizontal bar of the U. It is also possible to provide, for example in the case of FIG. 1, two couplings per rod: a first coupling as indicated in FIG. 1 which couples the resonators R2 and R5 and a second coupling which couples the resonators RI and R6.

Claims (4)

1. Filtre à résonateurs comportant un guide d'ondes rectangulaire (1-3) et n résonateurs diélectriques (n au moins égal à 4) disposés à l'intérieur du guide (RI-R6), dans lequel un couplage négatif est réalisé entre deux (R2, R5) des n résonateurs, caractérisé en ce que, le guide d'ondes fonctionne au-dessous de sa fréquence de coupure et est replié sur lui-même avec une paroi (2) commune à ses deux parties repliées, les deux résonateurs couplés négativement étant situés de part et d'autre de la paroi commune, les dimensions de la section transversales du guide étant de l'ordre de 2 à 2,5 fois les dimensions transversales des résonateurs, et en ce qu'il comporte une tige de couplage (20) pour réaliser le couplage négatif, cette tige traversant la paroi commune à travers un trou et étant, au moins en dehors de ses extrémités, séparée électriquement de la paroi commune.1. Resonator filter comprising a rectangular waveguide (1-3) and n dielectric resonators (n at least equal to 4) arranged inside the guide (RI-R6), in which a negative coupling is produced between two (R2, R5) of the n resonators, characterized in that, the waveguide operates below its cut-off frequency and is folded back on itself with a wall (2) common to its two folded parts, the two negatively coupled resonators being located on either side of the common wall, the dimensions of the cross section of the guide being of the order of 2 to 2.5 times the transverse dimensions of the resonators, and in that it comprises a coupling rod (20) for performing negative coupling, this rod passing through the common wall through a hole and being, at least outside its ends, electrically separated from the common wall. 2. Filtre selon la revendication 1, caractérisé en ce que la tige se termine en antenne des deux côtés de la paroi commune (figure 3).2. Filter according to claim 1, characterized in that the rod ends in antenna on both sides of the common wall (Figure 3). 3. Filtre selon la revendication 1, caractérisé en ce que, de chaque côté de la paroi commune, la tige forme une boucle pour venir en contact à ses extrémités avec la paroi commune (figure 4).3. Filter according to claim 1, characterized in that, on each side of the common wall, the rod forms a loop to come into contact at its ends with the common wall (Figure 4). 4. Filtre selon la revendication 1, caractérisé en ce que la tige se termine en antenne d'un premier côté de la paroi commune et forme, du second côté de la paroi commune, une boucle, pour venir en contact, à son extrémité, avec la paroi commune (figure 5).4. Filter according to claim 1, characterized in that the rod ends in antenna on a first side of the common wall and forms, on the second side of the common wall, a loop, to come into contact, at its end, with the common wall (Figure 5).
EP83401602A 1982-08-10 1983-08-02 Band-pass filter with dielectric resonators presenting negative coupling between resonators Expired EP0101369B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401602T ATE34488T1 (en) 1982-08-10 1983-08-02 STRIP PASS FILTER WITH DIELECTRIC RESONATORS, WITH NEGATIVE COUPLING BETWEEN RESONATORS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213927A FR2531815B1 (en) 1982-08-10 1982-08-10 BANDPASS FILTER WITH DIELECTRIC RESONATORS, HAVING NEGATIVE COUPLING BETWEEN RESONATORS
FR8213927 1982-08-10

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EP0101369A1 true EP0101369A1 (en) 1984-02-22
EP0101369B1 EP0101369B1 (en) 1988-05-18

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EP (1) EP0101369B1 (en)
AT (1) ATE34488T1 (en)
DE (1) DE3376717D1 (en)
FR (1) FR2531815B1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530676A1 (en) * 1985-08-28 1987-03-12 Licentia Gmbh Multi-circuit filter for frequency selection especially for the millimetric waveband, and a method for filter production
US5153541A (en) * 1991-05-20 1992-10-06 At&T Bell Laboratories Folded interdigital notch filter
US5410284A (en) * 1992-12-09 1995-04-25 Allen Telecom Group, Inc. Folded multiple bandpass filter with various couplings
US5739733A (en) * 1995-04-03 1998-04-14 Com Dev Ltd. Dispersion compensation technique and apparatus for microwave filters
US5777534A (en) * 1996-11-27 1998-07-07 L-3 Communications Narda Microwave West Inductor ring for providing tuning and coupling in a microwave dielectric resonator filter
US5781085A (en) * 1996-11-27 1998-07-14 L-3 Communications Narda Microwave West Polarity reversal network
US5841330A (en) * 1995-03-23 1998-11-24 Bartley Machines & Manufacturing Series coupled filters where the first filter is a dielectric resonator filter with cross-coupling
EP1045470A2 (en) * 1999-04-13 2000-10-18 Spinner GmbH Elektrotechnische Fabrik Bandpass filter with multiple coaxial cavities
EP1321997A2 (en) * 2001-12-21 2003-06-25 Radio Frequency Systems, Inc. Adjustable capacitive coupling structure
GB2555407A (en) * 2016-10-25 2018-05-02 Isotek Microwave Ltd A tuneable microwave filter and tuneable microwave multiplexer
CN111370818A (en) * 2020-03-06 2020-07-03 广东国华新材料科技股份有限公司 Capacitive coupling structure and dielectric filter

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FR951366A (en) * 1945-06-14 1949-10-24 Hazeltine Corp Adjustable signal selector
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters
FR2355403A1 (en) * 1976-06-14 1978-01-13 Murata Manufacturing Co ELECTRICAL CONNECTION FILTER
EP0060174A1 (en) * 1981-02-27 1982-09-15 Thomson-Csf Band-pass filter with dielectric resonators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR951366A (en) * 1945-06-14 1949-10-24 Hazeltine Corp Adjustable signal selector
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters
FR2355403A1 (en) * 1976-06-14 1978-01-13 Murata Manufacturing Co ELECTRICAL CONNECTION FILTER
EP0060174A1 (en) * 1981-02-27 1982-09-15 Thomson-Csf Band-pass filter with dielectric resonators

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530676A1 (en) * 1985-08-28 1987-03-12 Licentia Gmbh Multi-circuit filter for frequency selection especially for the millimetric waveband, and a method for filter production
US5153541A (en) * 1991-05-20 1992-10-06 At&T Bell Laboratories Folded interdigital notch filter
GB2257308A (en) * 1991-05-20 1993-01-06 American Telephone & Telegraph Folded interdigital notch filter.
GB2257308B (en) * 1991-05-20 1995-04-26 American Telephone & Telegraph Folded interdigital notch filter
US5410284A (en) * 1992-12-09 1995-04-25 Allen Telecom Group, Inc. Folded multiple bandpass filter with various couplings
US5841330A (en) * 1995-03-23 1998-11-24 Bartley Machines & Manufacturing Series coupled filters where the first filter is a dielectric resonator filter with cross-coupling
US6239673B1 (en) 1995-03-23 2001-05-29 Bartley Machines & Manufacturing Dielectric resonator filter having reduced spurious modes
US6094113A (en) * 1995-03-23 2000-07-25 Bartley Machines & Manufacturing Dielectric resonator filter having cross-coupled resonators
US5739733A (en) * 1995-04-03 1998-04-14 Com Dev Ltd. Dispersion compensation technique and apparatus for microwave filters
US5781085A (en) * 1996-11-27 1998-07-14 L-3 Communications Narda Microwave West Polarity reversal network
US5777534A (en) * 1996-11-27 1998-07-07 L-3 Communications Narda Microwave West Inductor ring for providing tuning and coupling in a microwave dielectric resonator filter
EP1045470A3 (en) * 1999-04-13 2001-11-07 Spinner GmbH Elektrotechnische Fabrik Bandpass filter with multiple coaxial cavities
EP1045470A2 (en) * 1999-04-13 2000-10-18 Spinner GmbH Elektrotechnische Fabrik Bandpass filter with multiple coaxial cavities
EP1321997A2 (en) * 2001-12-21 2003-06-25 Radio Frequency Systems, Inc. Adjustable capacitive coupling structure
EP1321997A3 (en) * 2001-12-21 2003-11-05 Radio Frequency Systems, Inc. Adjustable capacitive coupling structure
US6836198B2 (en) 2001-12-21 2004-12-28 Radio Frequency Systems, Inc. Adjustable capacitive coupling structure
GB2555407A (en) * 2016-10-25 2018-05-02 Isotek Microwave Ltd A tuneable microwave filter and tuneable microwave multiplexer
GB2555407B (en) * 2016-10-25 2021-12-15 Isotek Microwave Ltd A tuneable microwave filter and tuneable microwave multiplexer
CN111370818A (en) * 2020-03-06 2020-07-03 广东国华新材料科技股份有限公司 Capacitive coupling structure and dielectric filter

Also Published As

Publication number Publication date
EP0101369B1 (en) 1988-05-18
DE3376717D1 (en) 1988-06-23
FR2531815A1 (en) 1984-02-17
FR2531815B1 (en) 1985-08-02
ATE34488T1 (en) 1988-06-15

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