EP0779672A1 - Pseudo-elliptic filter in the millimeter range realised in waveguide technique - Google Patents

Pseudo-elliptic filter in the millimeter range realised in waveguide technique Download PDF

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Publication number
EP0779672A1
EP0779672A1 EP96402571A EP96402571A EP0779672A1 EP 0779672 A1 EP0779672 A1 EP 0779672A1 EP 96402571 A EP96402571 A EP 96402571A EP 96402571 A EP96402571 A EP 96402571A EP 0779672 A1 EP0779672 A1 EP 0779672A1
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Prior art keywords
cavities
waveguide
retro
coupling
pseudo
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German (de)
French (fr)
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Jean-Denis Schubert
Jean-Claude Cruchon
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Alcatel Lucent SAS
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Alcatel Telspace SA
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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
    • H01P1/207Hollow waveguide filters
    • H01P1/208Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49016Antenna or wave energy "plumbing" making

Definitions

  • the field of the invention is that of microwave filters and relates more precisely to a pseudo-elliptical filter in the millimeter range produced in waveguide technology.
  • a pseudo-elliptical filter in waveguide technology comprises a certain number of resonant cavities coupled together, for example by irises, and there are a certain number of retro-couplings between certain cavities.
  • microstrip lines It is known that back-couplings can be carried out in the form of microstrip lines.
  • This solution is however not optimal when the filter is carried out in waveguide technology (ie using resonant cavities) because the technologies are not the same. It is therefore necessary to add microstrip lines, provide for impedance adaptations, etc. There follows an increase in terms of cost and size.
  • U.S. Patent No. 4,772,863 to Rosenberg et al. describes a pseudo-elliptical filter produced in waveguide technology and also comprising retro-couplings.
  • One of these filters comprising six cavities, is represented in FIG. 1.
  • the cavities are referenced 10 to 15, the positive couplings 16 to 20 and the retro-couplings 21 to 24.
  • the signal input is denoted E and the output signal is denoted S.
  • a particular arrangement of the cavities 10 to 15 makes it possible to carry out the retro-couplings 21 to 24 by simple irises between the cavities 10 and 13, 11 and 13, 13 and 15 and finally 10 and 15.
  • the disadvantage of this solution is that the signal inputs and outputs in each cavity are not located 90 ° from each other (the angle between a signal input and a signal output is here 120 ° ) and it follows that certain parasitic propagation modes are not suppressed. For example, when such a filter carries a main mode H 011 , the parasitic mode E 111 - which is the most annoying because it is at the same frequency as the mode H 011 - is not deleted in the signal filter output S.
  • the present invention aims in particular to remedy these drawbacks.
  • one of the objectives of the invention is to provide a pseudo-elliptical filter in the millimeter range produced in waveguide technology where the signal inputs and outputs of each cavity are at 90 ° from each other and where the retro-couplings between cavities are carried out without using any other technology, so as to reduce the cost and the bulk and facilitate its realization.
  • Another object of the invention is to provide such a filter where the retro-couplings are not dictated by a particular arrangement of the cavities.
  • a pseudo-elliptical filter comprising resonant cavities positively coupled together, the signal input and output of each cavity being at 90 ° one on the other, this filter comprising at least one signal retro-coupling between two of the cavities, this retro-coupling being produced in the form of a waveguide.
  • this waveguide are optimized so that a true retro-coupling exists between the cavities which it connects, that is to say that at the interfaces between the cavities and the waveguide field lines are parallel and in opposite directions.
  • the waveguide can have iris accesses and, in this case, the back-coupling is carried out on a magnetic field.
  • the waveguide can also have accesses by pins and, in this case, the back-coupling is carried out on an electric field.
  • Figure 2 is a perspective view of a half-shell of a pseudo-elliptical filter according to the present invention, the other half-shell being symmetrical to that shown.
  • the various retro-couplings between cavities of a pseudo-elliptical filter are carried out using waveguides of adequate dimensions, so that, if we consider a retro-coupling between two cavities , the electric or magnetic field conveyed from one of the cavities to the other of the cavities, by means of this waveguide, ideally presents a phase opposition with respect to the same field present in this other cavity.
  • each waveguide has accesses by iris, that is to say that it communicates with the cavities 30 and 33 (32 and 35) by irises 41 and 42 (43 and 44 respectively), the retro-couplings being carried out on magnetic fields. These magnetic fields are represented in some of the cavities, the resonance mode here being the H 011 mode.
  • the waveguides are not resonant and only convey the components of the signals presented at their accesses.
  • the phase ⁇ of the magnetic field coming from the cavity 30 and conveyed in guide 47 is a multiple of k. ⁇ , with odd k.
  • the magnetic field lines are then in opposite directions.
  • the waveguide 48 connecting the cavities 32 and 35 the lengths and sections of the waveguides 47 and 48 are such that the magnetic field coming from a cavity rotates by 540 ° in the waveguide between irises 41 and 42 (43 and 44 respectively).
  • the invention described so far is applied to a retro-coupling on magnetic fields but it is also possible to carry out the retro-couplings on electric fields.
  • a pinule (antenna) is provided at the end of each waveguide to couple on the electric field (case of H 10 mode for example).
  • two waveguides advantageously connect the cavities 30 and 33 and 32 and 35 respectively.
  • a similar result can be obtained by retro-coupling the cavities 31 and 34 by a waveguide of greater length.
  • retro-couplings will be made between cavities 30 and 33, 32 and 35, 34 and 37.
  • the invention is particularly applicable to pseudo-elliptical filters operating in the millimeter band (frequencies between 20 GHz and 100 GHz), but can be used beyond.

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Abstract

The filter has a number of circular resonant cavities (30,35) with coupling between them. An input waveguide leads to an input slot to the first cavity, and the cavities are connected sequentially, with input and output coupling slots at right angles between them. Two sets of cavities have waveguide slots (47,48) which provide feedback by coupling the power from a down line cavity and feeding it back into a coupling slot in a previous cavity. Coupling is provided via a magnetic field.

Description

Le domaine de l'invention est celui des filtres hyperfréquences et concerne plus précisément un filtre pseudo-elliptique dans le domaine millimétrique réalisé en technologie guide d'ondes.The field of the invention is that of microwave filters and relates more precisely to a pseudo-elliptical filter in the millimeter range produced in waveguide technology.

Les filtres pseudo-elliptiques présentent de nombreux avantages par rapport aux filtres passe-bande classiques : ils sont plus simples à régler, présentent des pertes réduites et leur nombre de pôles est plus faible. Un filtre pseudo-elliptique en technologie guide d'ondes comporte un certain nombre de cavités résonantes couplées entre elles, par exemple par des iris, et il existe un certain nombre de rétro-couplages entre certaines cavités. L'article intitulé "New types of waveguide bandpass filters for satellite transponders" de A.E. Atia et A.E. Williams, Comsat Technical Review, vol.1, n°1, 1971, décrit de tels filtres pseudo-elliptiques.Pseudo-elliptical filters have many advantages over conventional bandpass filters: they are easier to adjust, have reduced losses and their number of poles is lower. A pseudo-elliptical filter in waveguide technology comprises a certain number of resonant cavities coupled together, for example by irises, and there are a certain number of retro-couplings between certain cavities. The article entitled "New types of waveguide bandpass filters for satellite transponders" by A.E. Atia and A.E. Williams, Comsat Technical Review, vol.1, n ° 1, 1971, describes such pseudo-elliptical filters.

On distinguera dans la suite de cette description les couplages consécutifs (positifs) qui assurent une simple transmission du signal hyperfréquence entre deux cavités voisines (les lignes de champ sont parallèles au niveau du couplage positif et de mêmes sens dans les deux cavités) et les rétro-couplages (non consécutifs) où les lignes de champ, également parallèles, sont de sens opposés.We will distinguish in the following of this description the consecutive (positive) couplings which ensure a simple transmission of the microwave signal between two neighboring cavities (the field lines are parallel at the level of the positive coupling and in the same directions in the two cavities) and the retro -couplings (not consecutive) where the field lines, also parallel, are in opposite directions.

Il est connu que les rétro-couplages peuvent être réalisés sous la forme de lignes micro-ruban. On peut par exemple se référer à l'article intitulé "Miniature dual mode microstrip filters" de J.A. Curtis et S.J. Fiedziusko, pages 443-446 de MTT-S Digest, IEEE, 1991. Cette solution n'est cependant pas optimale lorsque le filtre est réalisé en technologie guide d'ondes (c'est à dire à l'aide de cavités résonantes) car les technologies ne sont pas les mêmes. Il faut donc ajouter des lignes micro-ruban, prévoir des adaptations d'impédance, etc. Il s'en suit une augmentation en terme de coût et d'encombrement.It is known that back-couplings can be carried out in the form of microstrip lines. One can for example refer to the article entitled "Miniature dual mode microstrip filters" by JA Curtis and SJ Fiedziusko, pages 443-446 of MTT-S Digest, IEEE, 1991. This solution is however not optimal when the filter is carried out in waveguide technology (ie using resonant cavities) because the technologies are not the same. It is therefore necessary to add microstrip lines, provide for impedance adaptations, etc. There follows an increase in terms of cost and size.

Le brevet américain n°4.772.863 de Rosenberg et al. décrit un filtre pseudo-elliptique réalisé en technologie guide d'ondes et comportant également des rétro-couplages. Un de ces filtres, comportant six cavités, est représenté à la figure 1. Les cavités sont référencées 10 à 15, les couplages positifs 16 à 20 et les rétro-couplages 21 à 24. L'entrée de signal est notée E et la sortie de signal est notée S. Un agencement particulier des cavités 10 à 15 permet de réaliser les rétro-couplages 21 à 24 par de simples iris entre les cavités 10 et 13, 11 et 13, 13 et 15 et enfin 10 et 15.U.S. Patent No. 4,772,863 to Rosenberg et al. describes a pseudo-elliptical filter produced in waveguide technology and also comprising retro-couplings. One of these filters, comprising six cavities, is represented in FIG. 1. The cavities are referenced 10 to 15, the positive couplings 16 to 20 and the retro-couplings 21 to 24. The signal input is denoted E and the output signal is denoted S. A particular arrangement of the cavities 10 to 15 makes it possible to carry out the retro-couplings 21 to 24 by simple irises between the cavities 10 and 13, 11 and 13, 13 and 15 and finally 10 and 15.

L'inconvénient de cette solution est que les entrées et sorties de signal dans chaque cavité ne sont pas situées à 90° l'une de l'autre (l'angle entre une entrée de signal et une sortie de signal est ici de 120°) et il en résulte que certains modes de propagation parasites ne sont pas supprimés. A titre d'exemple, lorsqu'un tel filtre véhicule un mode principal H011, le mode parasite E111 - qui est le plus gênant car il est à la même fréquence que le mode H011 - n'est pas supprimé dans le signal de sortie S du filtre.The disadvantage of this solution is that the signal inputs and outputs in each cavity are not located 90 ° from each other (the angle between a signal input and a signal output is here 120 ° ) and it follows that certain parasitic propagation modes are not suppressed. For example, when such a filter carries a main mode H 011 , the parasitic mode E 111 - which is the most annoying because it is at the same frequency as the mode H 011 - is not deleted in the signal filter output S.

De plus, les positions relatives des différentes cavités sont dictées par les caractéristiques du filtre que l'on désire obtenir. Il est donc nécessaire de revoir la disposition des cavités pour tout nouveau type de filtre.In addition, the relative positions of the different cavities are dictated by the characteristics of the filter that it is desired to obtain. It is therefore necessary to review the arrangement of the cavities for any new type of filter.

Enfin, il n'est pas possible de réaliser n'importe quel type de rétro-couplage (à titre d'exemple, il n'est pas possible de rétro-coupler les cavités 12 et 15).Finally, it is not possible to carry out any type of retro-coupling (for example, it is not possible to retro-couple the cavities 12 and 15).

La présente invention a notamment pour objectif de remédier à ces inconvénients.The present invention aims in particular to remedy these drawbacks.

Plus précisément, un des objectifs de l'invention est de fournir un filtre pseudo-elliptique dans le domaine millimétrique réalisé en technologie guide d'ondes où les entrées et sortie de signal de chaque cavité sont à 90° l'une de l'autre et où les rétro-couplages entre cavités sont réalisés sans faire appel à une autre technologie, de manière à diminuer le coût et l'encombrement et faciliter sa réalisation.More specifically, one of the objectives of the invention is to provide a pseudo-elliptical filter in the millimeter range produced in waveguide technology where the signal inputs and outputs of each cavity are at 90 ° from each other and where the retro-couplings between cavities are carried out without using any other technology, so as to reduce the cost and the bulk and facilitate its realization.

Un autre objectif de l'invention est de fournir un tel filtre où les rétro-couplages ne sont pas dictés par une disposition particulière des cavités.Another object of the invention is to provide such a filter where the retro-couplings are not dictated by a particular arrangement of the cavities.

Ces objectifs, ainsi que d'autres qui apparaîtront par la suite, sont atteints grâce à un filtre pseudo-elliptique comprenant des cavités résonantes couplées entre elles positivement, l'entrée et la sortie de signal de chaque cavité étant à 90° l'une de l'autre, ce filtre comprenant au moins un rétro-couplage de signal entre deux des cavités, ce rétro-couplage étant réalisé sous la forme d'un guide d'ondes.These objectives, as well as others which will appear subsequently, are achieved by means of a pseudo-elliptical filter comprising resonant cavities positively coupled together, the signal input and output of each cavity being at 90 ° one on the other, this filter comprising at least one signal retro-coupling between two of the cavities, this retro-coupling being produced in the form of a waveguide.

La longueur et la section de ce guide d'ondes sont optimisées de sorte qu'un véritable rétro-couplage existe entre les cavités qu'il relie, c'est à dire qu'aux interfaces entre les cavités et le guide d'ondes les lignes de champ soient parallèles et de sens opposés.The length and section of this waveguide are optimized so that a true retro-coupling exists between the cavities which it connects, that is to say that at the interfaces between the cavities and the waveguide field lines are parallel and in opposite directions.

Le guide d'ondes peut présenter des accès par iris et, dans ce cas, le rétro-couplage s'effectue sur un champ magnétique.The waveguide can have iris accesses and, in this case, the back-coupling is carried out on a magnetic field.

Le guide d'ondes peut également présenter des accès par pinules et, dans ce cas, le rétro-couplage s'effectue sur un champ électrique.The waveguide can also have accesses by pins and, in this case, the back-coupling is carried out on an electric field.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante d'un mode de réalisation préférentiel, donné à titre illustratif et non limitatif, et des dessins annexés dans lesquels :

  • la figure 1 représente un filtre pseudo-elliptique connu ;
  • la figure 2 est une vue en perspective d'une demi-coquille d'un filtre pseudo-elliptique selon la présente invention.
Other characteristics and advantages of the invention will appear on reading the following description of a preferred embodiment, given by way of nonlimiting illustration, and of the appended drawings in which:
  • FIG. 1 represents a known pseudo-elliptical filter;
  • Figure 2 is a perspective view of a half-shell of a pseudo-elliptical filter according to the present invention.

La figure 1 a été décrite précédemment en référence à l'état de la technique.Figure 1 has been described above with reference to the state of the art.

La figure 2 est une vue en perspective d'une demi-coquille d'un filtre pseudo-elliptique selon la présente invention, l'autre demi-coquille étant symétrique de celle représentée.Figure 2 is a perspective view of a half-shell of a pseudo-elliptical filter according to the present invention, the other half-shell being symmetrical to that shown.

Selon l'invention, les différents rétro-couplages entre cavités d'un filtre pseudo-elliptique sont réalisés à l'aide de guide d'ondes de dimensions adéquates, de sorte que, si l'on considère un rétro-couplage entre deux cavités, le champ électrique ou magnétique véhiculé d'une des cavités vers l'autre des cavités, par l'intermédiaire de ce guide d'ondes, présente idéalement une opposition de phase par rapport au même champ présent dans cette autre cavité.According to the invention, the various retro-couplings between cavities of a pseudo-elliptical filter are carried out using waveguides of adequate dimensions, so that, if we consider a retro-coupling between two cavities , the electric or magnetic field conveyed from one of the cavities to the other of the cavities, by means of this waveguide, ideally presents a phase opposition with respect to the same field present in this other cavity.

A titre d'exemple, en référence à la figure 2, pour un filtre comportant six cavités 30 à 35 couplées positivement par des iris 36 à 40, l'entrée de signal étant notée E et la sortie de signal étant notée S, on réalise deux rétro-couplages entre les cavités 30 et 33 d'une part et 32 et 35 d'autre part par l'intermédiaire de guide d'ondes 47 et 48 respectivement. Dans le sens de circulation du signal, le guide d'ondes 47 relie les cavités 30 et 33 et le guide d'ondes 48 relie les cavités 32 et 35. Dans le mode de réalisation représenté, chaque guide d'ondes présente des accès par iris, c'est à dire qu'il communique avec les cavités 30 et 33 (32 et 35) par des iris 41 et 42 (43 et 44 respectivement), les rétro-couplages s'effectuant sur des champs magnétiques. Ces champs magnétiques sont représentés dans quelques unes des cavités, le mode de résonance étant ici le mode H011. Les guides d'ondes ne sont pas résonants et ne font que véhiculer les composantes des signaux présentées à leurs accès.By way of example, with reference to FIG. 2, for a filter comprising six cavities 30 to 35 positively coupled by irises 36 to 40, the signal input being denoted E and the signal output being denoted S, we realize two retro-couplings between the cavities 30 and 33 on the one hand and 32 and 35 on the other hand by means of waveguides 47 and 48 respectively. In the direction of signal flow, the waveguide 47 connects the cavities 30 and 33 and the waveguide 48 connects the cavities 32 and 35. In the embodiment shown, each waveguide has accesses by iris, that is to say that it communicates with the cavities 30 and 33 (32 and 35) by irises 41 and 42 (43 and 44 respectively), the retro-couplings being carried out on magnetic fields. These magnetic fields are represented in some of the cavities, the resonance mode here being the H 011 mode. The waveguides are not resonant and only convey the components of the signals presented at their accesses.

En se référant plus précisément au guide d'ondes référencé 47 en regard duquel est représentée la caractéristique de la phase φ du champ magnétique en fonction de la longueur du guide 47 (la phase φ évolue linéairement dans le guide d'ondes 47), il apparaît qu'à certaines distances de l'iris 41, la phase φ du champ magnétique issu de la cavité 30 et véhiculé dans le guide 47 est multiple de k.π, avec k impair. Cela signifie que l'on peut définir des zones, référencées 45 et 46, pour lesquelles le champ magnétique véhiculé dans le guide d'ondes 47 et provenant de la cavité 30 est sensiblement en opposition de phase par rapport au champ magnétique de la cavité à proximité de l'iris 42. Les lignes de champ magnétique sont alors de sens opposés. La même remarque s'applique au guide d'ondes 48 reliant les cavités 32 et 35. Ici, les longueurs et sections des guides d'ondes 47 et 48 sont telles que le champ magnétique issu d'une cavité tourne de 540° dans le guide d'ondes entre les iris 41 et 42 (43 et 44 respectivement).By referring more precisely to the waveguide referenced 47 opposite which is represented the characteristic of the phase φ of the magnetic field as a function of the length of the guide 47 (the phase φ evolves linearly in the waveguide 47), it appears that at certain distances from the iris 41, the phase φ of the magnetic field coming from the cavity 30 and conveyed in guide 47 is a multiple of k.π, with odd k. This means that we can define zones, referenced 45 and 46, for which the magnetic field conveyed in the waveguide 47 and coming from the cavity 30 is substantially in phase opposition with respect to the magnetic field of the cavity to near iris 42. The magnetic field lines are then in opposite directions. The same remark applies to the waveguide 48 connecting the cavities 32 and 35. Here, the lengths and sections of the waveguides 47 and 48 are such that the magnetic field coming from a cavity rotates by 540 ° in the waveguide between irises 41 and 42 (43 and 44 respectively).

On réalise ainsi des rétro-couplages en technologie guide d'ondes, un rétro-couplage optimal étant réalisé lorsque le champ magnétique issu d'un guide d'ondes est en opposition de phase par rapport à celui proche de la paroi d'une cavité dans laquelle débouche ce guide d'ondes.We thus carry out retro-couplings in waveguide technology, an optimal retro-coupling being carried out when the magnetic field coming from a waveguide is in phase opposition with respect to that close to the wall of a cavity. into which this waveguide leads.

La section (a) du guide d'ondes, c'est à dire la profondeur de l'usinage réalisé dans la demi-coquille représentée, joue sur la pente de la caractéristique de la figure 2. Cette pente est limitée par la fréquence de coupure du guide d'ondes λc = 2a et par le mode double λc = a. En fonction de la distance séparant deux cavités et plus précisément en fonction de la distance entre deux accès de cavités à rétro-coupler, on détermine la section du guide d'ondes afin de disposer d'une opposition de phase entre les signaux de ces cavités au niveau de ces accès de rétro-couplage.Section (a) of the waveguide, that is to say the depth of the machining carried out in the half-shell shown, plays on the slope of the characteristic of FIG. 2. This slope is limited by the frequency of breaking of the waveguide λ c = 2a and by the double mode λ c = a. According to the distance separating two cavities and more precisely according to the distance between two accesses of cavities to be retro-coupled, the section of the waveguide is determined in order to have a phase opposition between the signals of these cavities at the level of these back-coupling accesses.

L'invention décrite jusqu'ici est appliquée à un rétro-couplage sur des champs magnétiques mais il est également possible de réaliser les rétro-couplages sur des champs électriques. Dans ce cas, une pinule (antenne) est prévue à l'extrémité de chaque guide d'ondes pour se coupler sur le champ électrique (cas du mode H10 par exemple).The invention described so far is applied to a retro-coupling on magnetic fields but it is also possible to carry out the retro-couplings on electric fields. In this case, a pinule (antenna) is provided at the end of each waveguide to couple on the electric field (case of H 10 mode for example).

Comme indiqué précédemment, dans le cas d'un filtre à six cavités résonantes, dans le sens de circulation du signal, deux guides d'ondes relient avantageusement les cavités 30 et 33 et 32 et 35 respectivement. Un résultat similaire peut être obtenu en rétro-couplant les cavités 31 et 34 par un guide d'ondes de longueur plus importante. Dans le cas d'un filtre à huit cavités, on réalisera des rétro-couplages entre les cavités 30 et 33, 32 et 35, 34 et 37. On peut se référer à l'article intitulé "Synthesis of Microwave Bandpass Filters with Zolotarev Characteristics" de A.S. Belov et Yu.S. Ukraintsev, paru dans la revue JTT Telecommunications & Radio Eng. Part 1, SO Vol.36, n°3, mars 1982, pp.44-49, qui décrit d'autres possibilités de rétro-couplages.As indicated above, in the case of a filter with six resonant cavities, in the direction of flow of the signal, two waveguides advantageously connect the cavities 30 and 33 and 32 and 35 respectively. A similar result can be obtained by retro-coupling the cavities 31 and 34 by a waveguide of greater length. In the case of an eight-cavity filter, retro-couplings will be made between cavities 30 and 33, 32 and 35, 34 and 37. We can refer to the article entitled "Synthesis of Microwave Bandpass Filters with Zolotarev Characteristics "by AS Belov and Yu.S. Ukraintsev, published in the journal JTT Telecommunications & Radio Eng. Part 1, SO Vol.36, n ° 3, March 1982, pp.44-49, which describes other possibilities of back-coupling.

D'autres configurations de rétro-couplages sont bien entendu possibles, comme par exemple celles présentées dans le document US-4.772.863 précité.Other back-coupling configurations are of course possible, such as those presented in the aforementioned document US-4,772,863.

On notera que les entrées et sorties de signal de chaque cavité sont à 90° l'une de l'autre et, dans ce cas, le mode parasite le plus gênant (E111) est supprimé. Une réalisation d'un filtre pour le mode de résonance H011 présente l'avantage de présenter un coefficient de surtension important.It will be noted that the signal inputs and outputs of each cavity are at 90 ° from each other and, in this case, the most annoying parasitic mode (E 111 ) is eliminated. An embodiment of a filter for the resonance mode H 011 has the advantage of having a high overvoltage coefficient.

L'invention s'applique particulièrement aux filtres pseudo-elliptiques fonctionnant dans la bande millimétrique (fréquences comprises entre 20 GHz et 100 GHz), mais peut être utilisée au-delà.The invention is particularly applicable to pseudo-elliptical filters operating in the millimeter band (frequencies between 20 GHz and 100 GHz), but can be used beyond.

Claims (4)

Filtre pseudo-elliptique comprenant des cavités résonantes (30 à 35) couplées entre elles positivement (36 à 40), l'entrée et la sortie de signal de chaque cavité (30 à 35) étant à 90° l'une de l'autre, ledit filtre comprenant au moins un rétro-couplage de signal entre deux desdites cavités (30, 33; 32, 35), caractérisé en ce que ledit rétro-couplage est constitué par un guide d'ondes (47; 48).Pseudo-elliptical filter comprising resonant cavities (30 to 35) positively coupled together (36 to 40), the signal input and output of each cavity (30 to 35) being 90 ° from each other , said filter comprising at least one signal retro-coupling between two of said cavities (30, 33; 32, 35), characterized in that said retro-coupling consists of a waveguide (47; 48). Filtre selon la revendication 1, caractérisé en ce que ledit guide d'ondes (47; 48) présente des accès par iris (41, 42; 43, 44) et en ce que ledit rétro-couplage s'effectue sur un champ magnétique.Filter according to claim 1, characterized in that said waveguide (47; 48) has iris accesses (41, 42; 43, 44) and in that said retro-coupling takes place on a magnetic field. Filtre selon la revendication 1, caractérisé en ce que ledit guide d'ondes (47; 48) présente des accès par pinules et en ce que ledit rétro-couplage s'effectue sur un champ électrique.Filter according to claim 1, characterized in that said waveguide (47; 48) has accesses by pins and in that said retro-coupling takes place on an electric field. Filtre selon l'une des revendications 1 à 3, caractérisé en ce qu'il comporte six cavités (30 à 35) et en ce que deux guides d'ondes (47; 48) relient les cavités 30 et 33 et 32 et 35 respectivement pour réaliser lesdits rétro-couplages.Filter according to one of claims 1 to 3, characterized in that it comprises six cavities (30 to 35) and in that two waveguides (47; 48) connect the cavities 30 and 33 and 32 and 35 respectively to carry out said retro-couplings.
EP96402571A 1995-12-12 1996-11-28 Pseudo-elliptic filter in the millimeter range realised in waveguide technique Withdrawn EP0779672A1 (en)

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FR9514703 1995-12-12
FR9514703A FR2742262B1 (en) 1995-12-12 1995-12-12 PSEUDO-ELLIPTICAL FILTER IN THE MILLIMETER FIELD CARRIED OUT IN WAVEGUIDE TECHNOLOGY

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CA2192706A1 (en) 1997-06-13
FR2742262B1 (en) 1998-01-09
US5801606A (en) 1998-09-01
FR2742262A1 (en) 1997-06-13

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