EP0112328A1 - Microwave filter structure. - Google Patents

Microwave filter structure.

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Publication number
EP0112328A1
EP0112328A1 EP82901958A EP82901958A EP0112328A1 EP 0112328 A1 EP0112328 A1 EP 0112328A1 EP 82901958 A EP82901958 A EP 82901958A EP 82901958 A EP82901958 A EP 82901958A EP 0112328 A1 EP0112328 A1 EP 0112328A1
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EP
European Patent Office
Prior art keywords
cavity
coupling
cavities
iris
angular position
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Granted
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EP82901958A
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German (de)
French (fr)
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EP0112328B1 (en
Inventor
John David Rhodes
Richard John Cameron
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Agence Spatiale Europeenne
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Agence Spatiale Europeenne
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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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators

Definitions

  • the present invention relates to the production of microwave bandpass filters using dual-resonance cavities arranged so as to achieve asymmetrical transmission characteristics.
  • Microwave bandpass filters are widely used in terrestrial or space telecommunications systems for rejection of noise or interference signals and in multiplexers for combining or separating different transmission channels. The majority of these filters however have symmetrical transmission characteristics and are produced by microwave structures tuned synchronously, that is to say in which all the resonators are tuned to the same central frequency.
  • Fig. 1 schematically shows an exploded view of an execution with two resonant cavities.
  • the two cylindrical cavities 100 and 200 are separated by a plate 300 pierced with a cross coupling iris 400.
  • Each cavity supports two resonances in TE 11 mode polarized orthogonally to one another, each resonance being tuned individually by means of a tuning screw. These two orthogonal resonances are coupled by means of a coupling screw placed at 45 ° relative to the tuning screws.
  • the coupling between the resonances in the adjacent cavities 100 and 200 is carried out by the coupling iris 400.
  • This type of construction too, only achieves asymmetrical transmission characteristics with respect to the central frequency because this construction derives from an essentially symmetrical prototype network (fig. 2).
  • This is a folded ladder-shaped network to allow coupling between nonadjacent capacitors. These couplings are identified by the symbols K18, K27, K38.
  • Such a network is the electrical realization of the characteristics defined in mathematical form by transfer polynomials. The process to convert these polynomials into a prototype electrical network is described by JD Rhodes in: A low-pass prototype network for microwave linear phase filters (IEEE-MTT, Vol. MTT-18, June 1970, pp. 145-160).
  • the invention relates to a microwave filter using cavities with double resonance mode arranged so as to achieve asymmetrical transmission characteristics.
  • a microwave structure comprising a cascade of cylindrical cavities with double resonance mode, characterized in that each cavity is coupled to the adjacent cavity by a coupling iris oriented in a direction offset by a determined angle relative to the angular position of the tuning screws of the cavity and in that the adjacent cavity is offset by a determined angle relative to the angular position of the coupling iris which couples it to the first cavity .
  • fig. 1 is an exploded view of an embodiment of a microwave filter with cavities with double resonance mode to which the invention relates;
  • fig. 2 shows the electrical prototype network corresponding to a construction method as illustrated in FIG. 1;
  • fig. 3 shows a prototype electrical network which makes it possible to produce asymmetrical transmission characteristics;
  • fig. 4 is an elevational view illustrating the embodiment according to the invention.
  • fig. 5 is a view along the line V-V of FIG. 4;
  • figs. 6-8 show transmission characteristics of an exemplary embodiment according to the invention.
  • the references 100 and 200 designate the two cylindrical cavities which are separated by a coupling iris plate 300 pierced with a cross iris 400. Each cavity supports two resonances in TE 11 mode orthogonally polarized with respect to the other, each resonance being tuned individually by means of a tuning screw.
  • the tuning screws are noted 1 and 2. The angular position of these screws 1 and 2 will serve as a reference position for the organization of the structure.
  • the plate 300 is arranged in such a way that the coupling iris 400 is angularly offset by an angle ⁇ relative to the angular position of the tuning screws 1 and 2 of the first cavity 100.
  • the second cavity 200 is arranged such that the angular position of its tuning screws, noted 3 and 4, are angularly offset by an angle ⁇ relative to the angular position of the coupling iris 400.
  • the angular offset between the angular positions of the screws d agreement of the two cavities is therefore ⁇ + ⁇ .
  • In each cavity of this structure there are two independent resonances tuned by the tuning screws and the coupling of these two resonances is adjusted by a coupling screw located at 45 ° relative to the ac cord screws.
  • the coupling M 12 between the resonances 1 and 2 is adjusted by the screw 500 and in the cavity 200 the coupling M 34 between the resonances 3 and 4 is adjusted by the screw 600.
  • H 13 - M 1 cos ⁇ sin ⁇ - M 2 sin ⁇ cos ⁇
  • M 23 - M 1 sin ⁇ sin ⁇ + M 2 cos ⁇ cos ⁇
  • M24 M1 sin ⁇ cos ⁇ + M 2 cos ⁇ sin ⁇
  • a simplified embodiment for structures 4th and 6th degree is to use a simple slit as an iris instead of a cross-shaped iris.
  • M23 - M1 sin ⁇ sin ⁇
  • M 24 M 1 sin ⁇ sin ⁇
  • the method for establishing the structure of a microwave filter with cavities with double resonance mode comprises two steps.
  • the first consists, from the electrical prototype network corresponding to the desired transfer function, to convert the prototype network into a coupling matrix.
  • the second step consists in transforming this matrix until it contains only couplings which can be produced by a cascade of cavities with double resonance mode and their coupling components.
  • This process is developed in the following articles: "A novel realization for microwave bandpass filters” by RJ Cameron (ESA JOURNAL, vol.3, No.4, 1979, pp.281-287) and “Asymmetric realization for dual-mode bandpass filters "by RJ Cameron and JD Rhodes (IEEE Trans. MTT, Vol. MTT-29, No. 1, Jan. 1981, pp. 51-58).
  • An exemplary embodiment of the 4th degree was constructed with a slit iris.
  • the bandwidth of this filter is 80 MHz with a center frequency of 14125 MHz.
  • the theoretical loss, adaptation loss and group delay characteristics are shown in Figs. 6 to 8.
  • the second cavity is arranged so that the resonance tuning screw 3 is offset by an angle of 44.76 ° in the opposite direction to that of the movement of the needles of a watch with respect to the angular orientation of the coupling slot M 1 .
  • the input M 01 and output M 40 coupling slots are aligned with the angular positions of the resonance tuning screws 1 and 4 respectively: their lengths are calculated in the conventional way by the theory of termination impedances.

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Abstract

Une structure comprenant une cascade de cavités cylindriques à double mode de résonance, dans laquelle chaque cavité (par ex. 100) est couplée à la cavité adjacente (par ex. 200) par un iris de couplage (400) orienté suivant une direction décalée d'un angle déterminé () par rapport à la position angulaire des vis d'accord (1, 2) de la cavité (100) tandis que la cavité adjacente (200) est décalée d'un angle déterminé (psi) par rapport à la position angulaire de l'iris de couplage (400) qui la couple à la première cavité (100).A structure comprising a cascade of cylindrical dual-mode resonance cavities, in which each cavity (eg 100) is coupled to the adjacent cavity (eg 200) by a coupling iris (400) oriented in an offset direction d a determined angle () with respect to the angular position of the tuning screws (1, 2) of the cavity (100) while the adjacent cavity (200) is offset by a determined angle (psi) with respect to the angular position of the coupling iris (400) which couples it to the first cavity (100).

Description

Structure de filtre à micro-ondes Microwave filter structure
La présente invention concerne la réalisation de filtres passe-bande micro-ondes à l'aide de cavités à double mode de résonance agencées en sorte de réaliser des caractéristiques de transmission asymétriques.The present invention relates to the production of microwave bandpass filters using dual-resonance cavities arranged so as to achieve asymmetrical transmission characteristics.
Les filtres passe-bande micro-ondes sont largement utilisés dans les systèmes de télécommunication terrestres ou spatiaux pour assurer la réjection des signaux de bruit ou d'interférence et dans les multiplexeurs pour la combinaison ou la séparation des différentes voies de transmission. La majorité de ces filtres ont cependant des caractéristiques de transmission symétriques et sont réalisés par des structures micro-ondes accordées de façon synchrone, c'est-à-dire dans lesquelles tous les résonateurs se trouvent accordés à la même fréquence centrale.Microwave bandpass filters are widely used in terrestrial or space telecommunications systems for rejection of noise or interference signals and in multiplexers for combining or separating different transmission channels. The majority of these filters however have symmetrical transmission characteristics and are produced by microwave structures tuned synchronously, that is to say in which all the resonators are tuned to the same central frequency.
Il existe cependant des applications dans lesquelles il serait souhaitable de réaliser des structures de filtrage à caractéristique de transmission asymétrique. Tel est le cas, par exemple, des filtres des voies extérieures dans un multiplexeur à voies contiguës où l'absence d'une voie contiguë d'un côté provoque l' apparition d'une forte distorsion asymétrique dans les caractéristiques de perte d'insertion et de temps de propagation de groupe dans la bande passante. Une telle distorsion asymétrique peut être fortement dommageable pour les signaux numériques et si cette distorsion n'est pas corrigée, il est nécessaire d'adopter de plus fortes puissances pour les transmetteurs afin de rétablir le taux d'erreur binaire à celui que l'on aurait sans distorsion. Une autre application est celle de systèmes de transmission qui sont soumis à des spécifications de réfection asymétrique, par exemple dans une voie de réception qui est adjacente à une voie de transmission devant être rejetée avec une pente de coupure très abrupte.However, there are applications in which it would be desirable to produce filtering structures with an asymmetric transmission characteristic. This is the case, for example, of the filters of the external channels in a multiplexer with contiguous channels where the absence of a contiguous channel on one side causes the appearance of a strong asymmetric distortion in the characteristics of insertion loss. and group delay in bandwidth. Such asymmetric distortion can be highly damaging for digital signals and if this distortion is not corrected, it is necessary to adopt higher powers for transmitters in order to restore the bit error rate to that which we would have without distortion. Another application is that of transmission systems which are subject to asymmetric repair specifications, for example in a reception channel which is adjacent to a transmission channel to be rejected with a very steep cut slope.
Du point de vue réalisation matérielle, un type de construction particulièrement intéressant utilise des cavités à double mode de résonance, disposées en ligne. La fig. 1 montre schématiquement une vue éclatée d'une exécution à deux cavités résonnantes. Les deux cavités cylindriques 100 et 200 sont séparées par une plaque 300 percée d'un iris de couplage en croix 400. Chaque cavité supporte deux résonances en mode TE11 polarisées orthogonalement l 'une par rapport à l'autre, chaque résonance étant accordée individuellement au moyen d'une vis d'accord. Ces deux résonances orthogonales sont couplées au moyen d'une vis de couplage disposée à 45° par rapport aux vis d'accord. Le couplage entre les résonances dans les cavités adjacentes 100 et 200 se réalise par l'iris de couplage 400. Ce type de construction, lui aussi, ne réalise que des caractéristiques de transmission asymétriques par rapport à la fréquence centrale car cette construction dérive d'un réseau prototype essentiellement symétrique (fig. 2). Ceci est un réseau en forme d'échelle repliée afin de permettre le couplage entre des condensateurs non adjacents. Ces couplages sont identifiés par les symboles K18, K27, K38. Un tel réseau est la réalisation électrique des caractéristiques définies sous forme mathématique par des polynomes de transfert. Le procédé pour convertir ces polynomes en un réseau prototype électrique est décrit par J. D. Rhodes dans : A low-pass prototype network for microwave linear phase filters (IEEE-MTT, Vol. MTT-18, juin 1970, pp. 145- 160).From the material realization point of view, a particularly interesting type of construction uses cavities with double resonance mode, arranged in line. Fig. 1 schematically shows an exploded view of an execution with two resonant cavities. The two cylindrical cavities 100 and 200 are separated by a plate 300 pierced with a cross coupling iris 400. Each cavity supports two resonances in TE 11 mode polarized orthogonally to one another, each resonance being tuned individually by means of a tuning screw. These two orthogonal resonances are coupled by means of a coupling screw placed at 45 ° relative to the tuning screws. The coupling between the resonances in the adjacent cavities 100 and 200 is carried out by the coupling iris 400. This type of construction, too, only achieves asymmetrical transmission characteristics with respect to the central frequency because this construction derives from an essentially symmetrical prototype network (fig. 2). This is a folded ladder-shaped network to allow coupling between nonadjacent capacitors. These couplings are identified by the symbols K18, K27, K38. Such a network is the electrical realization of the characteristics defined in mathematical form by transfer polynomials. The process to convert these polynomials into a prototype electrical network is described by JD Rhodes in: A low-pass prototype network for microwave linear phase filters (IEEE-MTT, Vol. MTT-18, June 1970, pp. 145-160).
Pour réaliser des caractéristiques de transmission asymétriques il est nécessaire de réaliser une structure correspondant à un réseau prototype électrique équivalent comprenant des couplages en diagonale tels que K17, K26, K35 à la fig. 3.To achieve asymmetrical transmission characteristics, it is necessary to produce a structure corresponding to an equivalent electrical prototype network comprising diagonal couplings such as K17, K26, K35 in FIG. 3.
L'invention a pour objet un filtre micro-ondes utilisant des cavités à double mode de résonance agencées en sorte de réaliser des caractéristiques de transmission asymétriques.The invention relates to a microwave filter using cavities with double resonance mode arranged so as to achieve asymmetrical transmission characteristics.
Cet objectif est atteint suivant l'invention par une structure micro-ondes comprenant une cascade de cavités cylindriques à double mode dé résonance, caractérisée en ce que chaque cavité est couplée à la cavité adjacente par un iris de couplage orienté suivant une direction décalée d'un angle déterminé par rapport à la position angulaire des vis d'accord de la cavité et en ce que la cavité adjacente est décalée d'un angle déterminé par rapport à la position angulaire de l'iris de couplage qui la couple à la première cavité.This objective is achieved according to the invention by a microwave structure comprising a cascade of cylindrical cavities with double resonance mode, characterized in that each cavity is coupled to the adjacent cavity by a coupling iris oriented in a direction offset by a determined angle relative to the angular position of the tuning screws of the cavity and in that the adjacent cavity is offset by a determined angle relative to the angular position of the coupling iris which couples it to the first cavity .
L'invention est exposée en détail dans ce qui suit avec référence aux dessins ci-annexés sur lesquels :The invention is described in detail in the following with reference to the accompanying drawings in which:
la fig. 1 est une vue éclatée d'un mode de construction de filtre micro-ondes à cavités à double mode de résonance auquel se rapporte l'invention;fig. 1 is an exploded view of an embodiment of a microwave filter with cavities with double resonance mode to which the invention relates;
la fig. 2 montre le réseau prototype électrique correspondant à un mode de construction comme illustré à la fig. 1; la fig. 3 montre un réseau prototype électrique qui permet de réaliser des caractéristiques de transmission asymétriques;fig. 2 shows the electrical prototype network corresponding to a construction method as illustrated in FIG. 1; fig. 3 shows a prototype electrical network which makes it possible to produce asymmetrical transmission characteristics;
la fig. 4 est une vue en élévation illustrant le mode de réalisation selon l'invention;fig. 4 is an elevational view illustrating the embodiment according to the invention;
la fig. 5 est une vue suivant la ligne V-V de la fig. 4;fig. 5 is a view along the line V-V of FIG. 4;
les figs. 6-8 montrent des caractéristiques de transmission d'un exemple de réalisation selon l'invention.figs. 6-8 show transmission characteristics of an exemplary embodiment according to the invention.
Dans ce qui suit sera décrite une forme de réalisation à deux cavités (fig. 4). Les références 100 et 200 désignent les deux cavités cylindriques qui sont séparées par une plaque d'iris de couplage 300 percée d'un iris en croix 400. Chaque cavité supporte deux résonances en mode TE11 polarisées orthogonalement l'une par rapport à l'autre, chaque résonance étant accordée individuellement au moyen d'une vis d'accord. Pour la cavité 100 les vis d'accord sont notées 1 et 2. La position angulaire de ces vis 1 et 2 servira de position de référence pour l'organisation de la structure.In what follows will be described an embodiment with two cavities (fig. 4). The references 100 and 200 designate the two cylindrical cavities which are separated by a coupling iris plate 300 pierced with a cross iris 400. Each cavity supports two resonances in TE 11 mode orthogonally polarized with respect to the other, each resonance being tuned individually by means of a tuning screw. For the cavity 100, the tuning screws are noted 1 and 2. The angular position of these screws 1 and 2 will serve as a reference position for the organization of the structure.
La plaque 300 est disposée de telle manière que l'iris de couplage 400 soit décalé angulairement d'un angle θ par rapport à la position angulaire des vis d'accord 1 et 2 de la première cavité 100. La deuxième cavité 200 est disposée de telle manière que la position angulaire de ses vis d'accord, notées 3 et 4, soient décalées angulairement d'un angle ψ par rapport à la position angulaire de l'iris de couplage 400. Le décalage angulaire entre les positions angulaires des vis d'accord des deux cavités est donc θ +ψ. Dans chaque cavité de cette structure existent deux résonances indépendantes accordées par les vis d'accord et le couplage de ces deux résonances est ajusté par une vis de couplage située à 45° par rapport aux vis d'ac cord. Dans la cavité 100 le couplage M12 entre les résonances 1 et 2 est ajusté par la vis 500 et dans la cavité 200 le couplage M34 entre les résonances 3 et 4 est ajusté par la vis 600.The plate 300 is arranged in such a way that the coupling iris 400 is angularly offset by an angle θ relative to the angular position of the tuning screws 1 and 2 of the first cavity 100. The second cavity 200 is arranged such that the angular position of its tuning screws, noted 3 and 4, are angularly offset by an angle ψ relative to the angular position of the coupling iris 400. The angular offset between the angular positions of the screws d agreement of the two cavities is therefore θ + ψ. In each cavity of this structure there are two independent resonances tuned by the tuning screws and the coupling of these two resonances is adjusted by a coupling screw located at 45 ° relative to the ac cord screws. In the cavity 100 the coupling M 12 between the resonances 1 and 2 is adjusted by the screw 500 and in the cavity 200 the coupling M 34 between the resonances 3 and 4 is adjusted by the screw 600.
Désignant par M1 et M2 les couplages réalisés par les deux branches de l'iris 400, l'agencement illustré à la fig. 5 réalise entre les résonances des deux cavités, des couplages qui peuvent être explicités par les relations suivantes :Denoting by M 1 and M 2 the couplings produced by the two branches of the iris 400, the arrangement illustrated in FIG. 5 produces couplings between the resonances of the two cavities which can be explained by the following relationships:
H13 = - M1 cos θ sinψ - M2 sin θ cos ψH 13 = - M 1 cos θ sinψ - M 2 sin θ cos ψ
M14 = M1 cos θ cosψ - M2 sin θ sin ψ (I)M 14 = M 1 cos θ cosψ - M 2 sin θ sin ψ (I)
M23 = - M1 sin θ sin Ψ + M2 cos θ cos Ψ M 23 = - M 1 sin θ sin Ψ + M 2 cos θ cos Ψ
M24 = M1 sin θ cos Ψ + M2 cos θ sinΨM24 = M1 sin θ cos Ψ + M 2 cos θ sinΨ
La résolution simultanée de ces quatre équations par rapport aux quatre paramètres inconnus M1 , M2, θ etψ permet de déterminer tous les paramètres de construction nécessaires pour réaliser une structure à deux cavités.The simultaneous resolution of these four equations with respect to the four unknown parameters M 1 , M 2 , θ and ψ makes it possible to determine all the construction parameters necessary to make a structure with two cavities.
Le développement mathématique conduisant à la solution de ces équations simultanées sera publié dans 1a revue de la déposante "ESA JOURNAL", vol. 6, No. 2, 1982 avec un article de Richard J. Cameron intitulé : General synthesis methods for microwave filters.The mathematical development leading to the solution of these simultaneous equations will be published in the journal of the applicant "ESA JOURNAL", vol. 6, No. 2, 1982 with an article by Richard J. Cameron entitled: General synthesis methods for microwave filters.
La réalisation de cascades de degré plus élevé comptant un plus grand nombre de cavités se fait d'une manière identique.The realization of higher degree waterfalls with a greater number of cavities is done in an identical manner.
Une forme de réalisation simplifiée pour des structures du 4e et du 6e degré consiste à utiliser une simple fente comme iris au lieu d'un iris en forme de croix. Dans ce cas, les équations (I) se réduisent à l'ensemble suivant : M13 = - M1 cos θ sin ψA simplified embodiment for structures 4th and 6th degree is to use a simple slit as an iris instead of a cross-shaped iris. In this case, the equations (I) are reduced to the following set: M 13 = - M 1 cos θ sin ψ
M14 = M1 cos θ cos ψ (II)M 14 = M 1 cos θ cos ψ (II)
M23 = - M1 sin θ sin Ψ M24 = M1 sin θ sin ψM23 = - M1 sin θ sin Ψ M 24 = M 1 sin θ sin ψ
Le procédé pour établir la structure d'un filtre microondes avec cavités à double mode de résonance comprend deux étapes. La première consite, à partir du réseau prototype électrique correspondant à la fonction de transfert voulue, à convertir le réseau prototype en une matrice de couplage. La seconde étape consiste à transformer cette matrice jusqu'à ce qu'elle ne contienne plus que des couplages qui peuvent être réalisés par une cascade de cavités à double mode de résonance et leurs composants de couplage. Ce procédé se trouve développé dans les articles suivants : "A novel réalisation for microwave bandpass filters" par R.J. Cameron (ESA JOURNAL, vol.3, No.4, 1979,pp.281-287) et "Asymmetric réalisation for dual-mode bandpass filters" par R.J. Cameron et J.D. Rhodes (IEEE Trans. MTT, Vol. MTT-29, No. 1, Jan. 1981, pp. 51-58).The method for establishing the structure of a microwave filter with cavities with double resonance mode comprises two steps. The first consists, from the electrical prototype network corresponding to the desired transfer function, to convert the prototype network into a coupling matrix. The second step consists in transforming this matrix until it contains only couplings which can be produced by a cascade of cavities with double resonance mode and their coupling components. This process is developed in the following articles: "A novel realization for microwave bandpass filters" by RJ Cameron (ESA JOURNAL, vol.3, No.4, 1979, pp.281-287) and "Asymmetric realization for dual-mode bandpass filters "by RJ Cameron and JD Rhodes (IEEE Trans. MTT, Vol. MTT-29, No. 1, Jan. 1981, pp. 51-58).
Un exemple de réalisation du 4e degré a été construit avec un iris à fente. La bande passante de ce filtre est de 80 MHz avec une fréquence centrale de 14125 MHz. Les caractéristiques d'affaiblissement théorique, d'affaiblissement d'adaptation et de temps de propagation de groupe sont montrées aux figs. 6 à 8.An exemplary embodiment of the 4th degree was constructed with a slit iris. The bandwidth of this filter is 80 MHz with a center frequency of 14125 MHz. The theoretical loss, adaptation loss and group delay characteristics are shown in Figs. 6 to 8.
Ce filtre a été réalisé en se basant sur la matrice de couplage prototype du tableau 1. Après transformation avec pivot à (2,3), angle λ = 35, 95°, on obtient la matrice de couplage du tableau 2. This filter was produced based on the prototype coupling matrix of table 1. After transformation with pivot at (2,3), angle λ = 35, 95 °, we obtain the coupling matrix of table 2.
La résolution des équations (Il) donne les valeurs des paramètres de construction:The resolution of equations (II) gives the values of the construction parameters:
θ = 90° = -44,76° M1 = 0,7925θ = 90 ° = -44.76 ° M 1 = 0.7925
Constructivement, l'iris de couplage entre les deux cavités est une fente orientée à angles droits par rapport à la position angulaire de la vis d'accord de résonance 1 et la longueur de la fente se calcule de la manière habituelle pour réaliser le couplage de valeur M1 = 0,7925. La deuxième cavité est disposée en sorte que la vis d'accord de résonance 3 soit décalée d'un angle de 44,76° dans le sens contraire à celui du déplacement des aiguilles d'une montre par rapport à l'orientation angulaire de la fente de couplage M1. Les fentes de couplage d'entrée M01 et de sortie M40 sont alignées avec les positions angulaires des vis d'accord de résonance 1 et 4 respectivement : leurs longueurs sont calculées de la façon classique par la théorie des impédances de terminaison. Constructively, the coupling iris between the two cavities is a slot oriented at right angles to the angular position of the resonance tuning screw 1 and the length of the slot is calculated in the usual way to achieve the coupling of M value 1 = 0.7925. The second cavity is arranged so that the resonance tuning screw 3 is offset by an angle of 44.76 ° in the opposite direction to that of the movement of the needles of a watch with respect to the angular orientation of the coupling slot M 1 . The input M 01 and output M 40 coupling slots are aligned with the angular positions of the resonance tuning screws 1 and 4 respectively: their lengths are calculated in the conventional way by the theory of termination impedances.

Claims

R E V E N D I C A T I O N S
1. Structure de filtre micro-ondes comprenant une cascade de cavités cylindriques à double mode de résonance, chaque cavité étant munie de deux vis d'accord disposées à 90° l'une par rapport à l'autre dans le plan d'une section de la cavité, caractérisée en ce que chaque cavité (par ex. 100) est couplée à la cavité adjacente (par ex. 200) par un iris de couplage (400) orienté suivant une direction décalée d'un angle déterminé (θ) par rapport à la position angulaire des vis d'accord (1, 2) de la cavité (100) et en ce que la cavité adjacente (200) est décalée d'un angle déterminé (Ψ) par rapport à la position angulaire de l'iris de couplage (400) qui la couple à la première cavité (100).1. Microwave filter structure comprising a cascade of cylindrical cavities with double resonance mode, each cavity being provided with two tuning screws arranged at 90 ° relative to each other in the plane of a section of the cavity, characterized in that each cavity (eg 100) is coupled to the adjacent cavity (eg 200) by a coupling iris (400) oriented in a direction offset by a determined angle (θ) by relative to the angular position of the tuning screws (1, 2) of the cavity (100) and in that the adjacent cavity (200) is offset by a determined angle (Ψ) relative to the angular position of the coupling iris (400) which couples it to the first cavity (100).
2. Structure de filtre micro-ondes selon la revendication 1 , dans laquelle les iris de couplage ont la forme d'une croix.2. Microwave filter structure according to claim 1, in which the coupling irises have the shape of a cross.
3. Structure de filtre micro-ondes selon la revendication 1, dans laquelle les iris de couplage ont la forme. d'une fente. 3. Microwave filter structure according to claim 1, in which the coupling irises have the shape. of a slot.
EP82901958A 1982-06-11 1982-06-11 Microwave filter structure Expired EP0112328B1 (en)

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PCT/BE1982/000015 WO1983004457A1 (en) 1982-06-11 1982-06-11 Microwave filter structure

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EP0112328B1 EP0112328B1 (en) 1987-11-19

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JPH034122B2 (en) 1991-01-22
WO1983004457A1 (en) 1983-12-22
JPS59501141A (en) 1984-06-28
US4544901A (en) 1985-10-01
EP0112328B1 (en) 1987-11-19

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