EP0164050A1 - Filter with a main waveguide loaded with lateral waveguides - Google Patents
Filter with a main waveguide loaded with lateral waveguides Download PDFInfo
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- EP0164050A1 EP0164050A1 EP85106515A EP85106515A EP0164050A1 EP 0164050 A1 EP0164050 A1 EP 0164050A1 EP 85106515 A EP85106515 A EP 85106515A EP 85106515 A EP85106515 A EP 85106515A EP 0164050 A1 EP0164050 A1 EP 0164050A1
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- guides
- main guide
- guide
- filter
- rectangular
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
Definitions
- the present invention relates to a filter comprising a main waveguide, the two ends of which are coupled to the two ports of the filter, and also comprising at least one lateral guide which opens, at one of its ends, into a hole drilled in the wall of the main guide and which is generally loaded, at its other end, with an absorbent material.
- Such filters are known and are, for example, plugged into the output switches of power amplifiers working in centimeter waves, so as to reduce the level of harmonics radiated in space.
- Known filters are produced by means of a rectangular main guide whose four sides, or at least one of the two long sides, are loaded by lateral guides, which are also rectangular but of smaller cross section than that of the main guide.
- These filters sometimes include, at their two accesses, an impedance adapter of the progressive fitting type (type in Anglo-Saxon literature) or of the discontinuous fitting type in steps (steps in Anglo-Saxon literature); this impedance adapter, which constitutes a rectangular guide fitting, rectangular guide, is intended to increase the coupling of the lateral guides by reducing the distance between the two long sides of the main guide, that is to say by taking, for the guide main, an internal section whose short sides are smaller than those of the filter connection ports; the long sides, on the other hand, keep the same dimension as the long sides of the external rectangular guides to which the filter is connected.
- the object of the present invention is to avoid or at least reduce these drawbacks.
- a filter comprising a rectangular main guide, n secondary guides with n integer at least equal to 1, coupled at one of their ends, to the main guide by holes passing through the wall of the main guide, and two adapters d impedance of the rectangular guide-rectangular guide connection type, respectively coupled to the two ends of the main guide, is characterized in that the n secondary guides are cylindrical guides and in that the impedance transformers have, at their ends, sections internal rectangulars of which both the length and the width are smaller on the side coupled to the main guide than on the side opposite the main guide.
- Figure 1 shows a filter according to the invention in partial side view with a part shown in broken away.
- the secondary guides of the filter open into guide 1 through circular holes of a diameter of 5.38 mm, equal to the inside diameter of the guides, except for the first five and the last five guides of each alignment, for which the couplings are of a smaller diameter so as not to capture too large a fraction of the energy of the main guide, 1. In each alignment and from each of the ends of the alignment, the five.
- first holes have respective diameters of 4.16, 4.40, 4.67 and 4.95 mm; thus, from the filter ports, the couplings of the secondary gulds are progressively increasing, which reduces the power applied to the first loads and makes it possible to avoid destroying them when the input power is high; as this progressive growth of the couplings of the secondary guides is found on each side of the filter, the two ports of the filter can serve as inlet access since there is no need to choose one rather than the other for reasons for power dissipation in the first charges.
- the thirty other secondary guides of each claim being all identical to each other and emerging through identical holes in the guide 1, the middle part of the filter in FIG. 1 has not been drawn so that, depending on the space available for Figure 1, the parts shown are drawn to a scale allowing a good understanding of their details.
- Figure 3 is a cross section of the filter of Figures 1 and 2, at the height of the eighth side assembly, counting from the left end in Figure 1; this section shows the six secondary guides A8, B8, C8, D8, E8, F8 with their respective loads La8,; Lb8, Lc8, Ld8, Le8, Lf8 and their covers G, H, 1, J. The charges are fixed in the covers by gluing.
- the filter which has just been described is a harmonic filter 2, intended to pass a fundamental frequency between 17.3 and 18.1 GHz. Its performance, for a test power of 1.3 kW, is as follows: for the fundamental the losses are 0.11 dB and the standing wave ratio is 1.035 while for a harmonic 2 of between 34, 6 and 36.2 GHz losses are greater than 50 dB and the standing wave ratio is 1.23.
- the sections are important, since it is no longer possible to reduce a thickness without reducing a width, and this results in significant discontinuities in the wall of the main guide; these discontinuities lead to an artificial widening of the main guide; therefore, the cutoff frequency of the first two parasitic modes TE01 and TE02 is lowered, which creates parasitic resonances which appear, in particular, in the band 17.3 - 18.1 GHz.
- the main guide of the filter can be associated with secondary guides for me only by its two long sides or even by only one of its long sides.
- the number of secondary guides if it must at least be equal to 1, is limited only by the space available for the filter; moreover, it is possible to fill the secondary guides with dielectric in order to reduce their section without increasing their cut-off frequency; it is also possible to distribute the secondary guides in different ways along the main guide and, in particular, the reprartitian may not be regular.
- the impedance adapters at the filter ports such as 2 and 4 in FIG. 1, they can be of the progressive fitting or discontinuous fitting type.
Abstract
Filtre comportant un guide d'ondes rectangulaire (1) prolongé, à ses deux extrémités, par des raccords guide rectangulaire-guide rectangulaire (2, 4) et chargé par des guides d'ondes latéraux (B1-B40, D1-D4O). Pour permettre l'utilisation de guides latéraux cylindriques sans introduire des résonances parasites, les raccords ont, à leurs extrémités, des sections internes rectangulaires dont, à la fois, la longueur et la largeur sont plus petites du côté couplé au guide principal que du côté opposé au guide principal. Application, en particulier, dans les aiguillages de sortie des amplificateurs de puissance travaillant en ondes centimétriques.Filter comprising a rectangular waveguide (1) extended, at its two ends, by rectangular guide-rectangular guide fittings (2, 4) and loaded by lateral waveguides (B1-B40, D1-D4O). To allow the use of cylindrical lateral guides without introducing parasitic resonances, the fittings have, at their ends, rectangular internal sections whose length and width are both smaller on the side coupled to the main guide than on the side opposite the main guide. Application, in particular, in the output switches of power amplifiers working in centimeter waves.
Description
La présente invention se rapporte à un filtre comportant un guide d'ondes principal, dont les deux extrémités sont couplées aux deux accès du filtre, et comportant également au moins un guide latéral qui débouche, à l'une de ses extrémités, dans un trou percé dans la paroi du guide principal et qui est généralement chargé, à son autre extrémité, par un matériau absorbant.The present invention relates to a filter comprising a main waveguide, the two ends of which are coupled to the two ports of the filter, and also comprising at least one lateral guide which opens, at one of its ends, into a hole drilled in the wall of the main guide and which is generally loaded, at its other end, with an absorbent material.
De tels filtres sont connus et sont, par exemple, branchés dans les aiguillages de sortie des amplificateurs de puissance travaillant en ondes centimétriques, de manière à réduire le taux d'harmoniques rayonnés dans l'espace.Such filters are known and are, for example, plugged into the output switches of power amplifiers working in centimeter waves, so as to reduce the level of harmonics radiated in space.
Les filtres connus sont réalisés au moyen d'un guide principal rectangulaire dont les quatre côtés, ou au moins l'un des deux grands côtés, sont chargés par des guides latéraux, eux aussi rectangulaires mais de section plus faible que celle du guide principal. Ces filtres comportent parfois, à leurs deux accès, un adaptateur d'impédance du type raccord progressif (taper dans la littérature anglo-saxonne) ou du type raccord discontinu en marches (steps dans la littérature anglo-saxonne) ; cet adaptateur d'impédance, qui constitue un raccord guide rectangulaire guide rectangulaire, est destiné à augmenter le couplage des guides latéraux en réduisant la distance entre les deux grands côtés du guide principal, c'est-à-dire en prenant, pour le guide principal, une section interne dont les petits côtés sont plus petits que ceux des accès de raccordement du filtre ; les grands côtés, par contre, gardent la même dimension que les grands côtés des guides rectangulaires extérieurs auxquels le filtre est raccordé.Known filters are produced by means of a rectangular main guide whose four sides, or at least one of the two long sides, are loaded by lateral guides, which are also rectangular but of smaller cross section than that of the main guide. These filters sometimes include, at their two accesses, an impedance adapter of the progressive fitting type (type in Anglo-Saxon literature) or of the discontinuous fitting type in steps (steps in Anglo-Saxon literature); this impedance adapter, which constitutes a rectangular guide fitting, rectangular guide, is intended to increase the coupling of the lateral guides by reducing the distance between the two long sides of the main guide, that is to say by taking, for the guide main, an internal section whose short sides are smaller than those of the filter connection ports; the long sides, on the other hand, keep the same dimension as the long sides of the external rectangular guides to which the filter is connected.
Ces filtres connus sont d'un prix de revient élevé du fait du nombre généralement important de guides latéraux qui doivent être associés au guide principal ; de plus ils sont très difficiles à réaliser par électro-érosion ou élecro-formage.These known filters have a high cost price due to the generally large number of lateral guides which must be associated with the main guide; moreover, they are very difficult to produce by EDM or electroforming.
La présente invention a pour but d'éviter ou, pour le moins, de réduire ces inconvénients.The object of the present invention is to avoid or at least reduce these drawbacks.
Ceci est obtenu, en particulier, en utilisant, comme guides latéraux, des guides cylindriques dont la réalisation, d'une part, et la mise en place par rapport au guide principal, d'autre part, sont plus simples que celles des guides rectangulaires. II est à noter que, si le remplacement des guides latéraux cylindriques, paraît aller de soi, il pase, en fait, des problèmes qui, semble-t-il, n'avaient pas été sérieusement étudiés et surtout résolus ; ceci explique que, jusqu'alors, seuls des filtres à guides latéraux rectangulaires aient été réalisés ; la suite de la descriptian montrera quelles précautions doivent être prises pour un fonctionnement correct des filtres à guides latéraux cylindriques.This is obtained, in particular, by using, as lateral guides, cylindrical guides whose production, on the one hand, and positioning relative to the main guide, on the other hand, are simpler than those of the rectangular guides . It should be noted that, while the replacement of the cylindrical lateral guides seems to be self-evident, it in fact poses problems which, it seems, had not been seriously studied and above all resolved; this explains why, until then, only filters with rectangular lateral guides have been produced; the rest of the description will show what precautions must be taken for the correct functioning of filters with cylindrical lateral guides.
Selon l'invention un filtre comportant un guide principal rectangulaire, n guides secondaires avec n entier au moins égal à 1, couplés à l'une de leurs extrémités, au guide principal par des trous traversant la paroi du guide principal, et deux adaptateurs d'impédance du type raccord guide rectangulaire-guide rectangulaire, respectivement couplés aux deux extrémités du guide principal, est caractérisé en ce que les n guides secondaires sont des guides cylindriques et en ce que les transformateurs d'impédance ont, à leurs extrémités, des sections internes rectangulaires dont, à la fois, la longueur et la largeur sont plus petites du côté couplé au guide principal que du côté opposé au guide principal.According to the invention a filter comprising a rectangular main guide, n secondary guides with n integer at least equal to 1, coupled at one of their ends, to the main guide by holes passing through the wall of the main guide, and two adapters d impedance of the rectangular guide-rectangular guide connection type, respectively coupled to the two ends of the main guide, is characterized in that the n secondary guides are cylindrical guides and in that the impedance transformers have, at their ends, sections internal rectangulars of which both the length and the width are smaller on the side coupled to the main guide than on the side opposite the main guide.
La présente invention sera mieux comprise et d'autres caractéristiques apparaitront à l'aide de la description ci-après et des figures s'y rapportant qui représentent:
- - la figure 1, un filtre selon l'invention vu de côté,
- - la figure 2, le filtre de la figure 1 vu de bout,
- - la figure 3, une coupe transversale du filtre des figures 1 et 2 Les références données aux éléments se correspondent d'une figure à l'autre.
- FIG. 1, a filter according to the invention seen from the side,
- FIG. 2, the filter of FIG. 1 seen from the end,
- - Figure 3, a cross section of the filter of Figures 1 and 2 The references given to the elements correspond from one figure to another.
La figure 1 montre un filtre selon l'invention en vue partielle de côté avec une partie représentée en arraché.Figure 1 shows a filter according to the invention in partial side view with a part shown in broken away.
La figure 2, qui montre le filtre vu en bout, comporte un trait d'axe, XX, qui indique l'arraché de la figure 1 ; en plus de cet arraché le pasage de la figure 2 à la figure 1 se fait par l'enlèvement de la pièce H de la figure 2. Le filtre comporte, en se référant aux figures 1 et 2 :
- - une bride de
fixation 3, - - une adaptateur d'impédance, 2, qui, avec la bride 3 a une longueur de 30 mm et qui passe d'une section interne de 15,8 x 7,9 mm à son extrémité située du côté de la
bride 2, à une section interne de 14 x 7 mm à son autre extrémité, - - un guide principal, 1, rectangulaire, d'une section interne de 14 x 7 mm et de 270 mm de longueur ; sur le pourtour de ce guide principal sont fixés quarante ensemble latéraux comportant chacun six guides secondaires, cylindriques, tels que Al, B1, Cl, Dl, El, F1, placés dans un même plan transversal du guide principal,
- - un adaptateur d'impédance 4, symétrique de l'adaptateur 2 par rapport à un plan de symétrie constitué par le plan transversal, non représenté, passant par le milieu du guide 1,
- - une bride de fixation, 5, symétrique de la
bride 3 par rapport au plan de symétrie mentionné ci-avant.
- - a mounting
flange 3, - - an impedance adapter, 2, which, with the
flange 3 has a length of 30 mm and which passes from an internal section of 15.8 x 7.9 mm at its end situated on the side of theflange 2, to an internal section of 14 x 7 mm at its other end, - - a main guide, 1, rectangular, with an internal section of 14 x 7 mm and 270 mm in length; around the periphery of this main guide are fixed forty lateral assemblies each comprising six secondary, cylindrical guides, such as Al, B1, Cl, Dl, El, F1, placed in the same transverse plane of the main guide,
- an
impedance adapter 4, symmetrical with theadapter 2 with respect to a plane of symmetry constituted by the transverse plane, not shown, passing through the middle of the guide 1, - - A fixing flange, 5, symmetrical with the
flange 3 with respect to the plane of symmetry mentioned above.
Il est à noter que, dans la réalisation qui est décrite, ce ne sont pas seulement les brides 3, 5 et les adaptateurs d'impédance 2, 4 qui sont symétriques par rapport au plan de symétrie mais tout le filtre et qu'ainsi le filtre est parfaitement réversible.It should be noted that, in the embodiment which is described, it is not only the
Chacun des quarante ensembles dont il a été question ci-avant, comporte :
- - les six guides secondaires, cyclindriques, tels que Al, B1, Cl, Dl, El, FI, répartis dans un même plan transversal du guide principal 1 et dont deux, tels que Al, B1, figure 2, débouchent dans l'un des grands côtés du guide 1, et deux autres, tels que Dl, El, débouchent dans l'autre grand côté du guide 1 ; les deux derniers guides secondaires, tels que Cl et FI, débouchent respectivement dans les deux petits côtés du guide 1 ; les guides secondaires de ces quarante ensemble ont tous un diamètre intérieur de 5,38 mm et une longueur de 30 mm ; dans le sens de la longueur du guide 1 les guides secondaires forment six alignements de quarante guides parallèles, jointifs, tels que B1-B40 et D1-D40 sur la figure 1,
- - des capots qui recouvrent les extrémités des guides secondaires opposées au guide principal ; les capots des extrémités des guides secondaires sont associés pour former quatre grands capots G, H, I, J qui recouvrent respectivement tous les guides secondaires tels que Al, B1, tels que C1, tels que Dl et tels que FI,
- - des charges, telles que Lbl, Lb9, Lb40 (figure 1), réalisées en matériau absorbant de 2 mm d'épaisseur, pénètrent dans chacun des guides secondaires par les extrémités situées à l'oppasé- du guide principal 1 ; les charges des quarante guides secondaires d'un même alignement sont reliées entre elles à travers des encoches, telles que K, figure 1, pratiquées à l'extrémité des guides secondaires opposée au guide I, dans la partie jointive des guides successifs d'un même alignement ; ces charges forment ainsi six lames de scie, telle que L figure 1, dont les quarante dents constituent donc quarante charges de guides secondaires.
- - The six secondary guides, cyclic, such as Al, B1, Cl, Dl, El, FI, distributed in the same transverse plane of the main guide 1 and two of which, such as Al, B1, Figure 2, open into one long sides of guide 1, and two others, such as Dl, El, open into the other long side of guide 1; the last two secondary guides, such as C1 and FI, open respectively into the two short sides of the guide 1; the secondary guides of these forty sets all have an internal diameter of 5.38 mm and a length of 30 mm; in the lengthwise direction of the guide 1, the secondary guides form six alignments of forty parallel, contiguous guides, such as B1-B40 and D1-D40 in FIG. 1,
- - covers which cover the ends of the secondary guides opposite the main guide; the covers of the ends of the secondary guides are associated to form four large covers G, H, I, J which respectively cover all the secondary guides such as Al, B1, such as C1, such as Dl and such as FI,
- - Loads, such as Lbl, Lb9, Lb40 (Figure 1), made of
absorbent material 2 mm thick, enter each of the secondary guides through the ends located opposite the main guide 1; the loads of the forty secondary guides of the same alignment are connected to each other through notches, such as K, FIG. 1, formed at the end of the secondary guides opposite to guide I, in the contiguous part of the successive guides of a same alignment; these loads thus form six saw blades, such as L FIG. 1, the forty teeth of which therefore constitute forty loads of secondary guides.
Les guides secondaires du filtre débouchent dans le guide 1 par des trous circulaires d'un dlamètre de 5,38 mm, égal au diamètre intérieur des guides, sauf pour les cinq premiers et les cinq derniers guides de chaque alignement, pour lesquels les trous de couplage sont d'un diamètre plus faible afin de ne pas capter une fraction trop grande de l'énergie du guide principal, 1. Dans chaque alignement et à partir de chacune des extrémités de l'alignement, les cinq. premiers trous ont des diamètres respectifs de 4,16, 4,40, 4,67 et 4,95 mm ; ainsi, à partir des accès du filtre, les couplages des guldes secondaires sont progressivement croissants ce qui réduit la puissance appliquée sur les premières charges et permet d'éviter de les détruire quand la puissance d'entrée est importante ; comme cette croissance progressive des couplages des guides secondaires se retrouve de chaque côté du filtre, les deux accès du filtre peuvent servir d'accès d'entrée puisqu'il n'y a pas à choisir l'un plutôt que l'autre pour des raisons de dissipation de puissance dans les premières charges. Les trente autres guides secocxtaires de chaque allgnement étant tous identiques entre eux et débouchant par des trous identiques dans le guide 1, la partie du milieu du filtre sur la figure 1 n'a pas été dessinée de manière que, en fonction de la place disponible pour la figure 1, les parties représentées soient dessinées à uen échelle permettant une bonne compréhension de leurs détails.The secondary guides of the filter open into guide 1 through circular holes of a diameter of 5.38 mm, equal to the inside diameter of the guides, except for the first five and the last five guides of each alignment, for which the couplings are of a smaller diameter so as not to capture too large a fraction of the energy of the main guide, 1. In each alignment and from each of the ends of the alignment, the five. first holes have respective diameters of 4.16, 4.40, 4.67 and 4.95 mm; thus, from the filter ports, the couplings of the secondary gulds are progressively increasing, which reduces the power applied to the first loads and makes it possible to avoid destroying them when the input power is high; as this progressive growth of the couplings of the secondary guides is found on each side of the filter, the two ports of the filter can serve as inlet access since there is no need to choose one rather than the other for reasons for power dissipation in the first charges. The thirty other secondary guides of each claim being all identical to each other and emerging through identical holes in the guide 1, the middle part of the filter in FIG. 1 has not been drawn so that, depending on the space available for Figure 1, the parts shown are drawn to a scale allowing a good understanding of their details.
La figure 3 est une coupe transversale du filtre des figures 1 et 2, à la hauteur du huitième ensemeble latéral, en comptant à partir de l'extrémtté de gauche sur la figure 1; cette coupe montre les six guides secondaires A8, B8, C8, D8, E8, F8 avec leurs charges respectives La8, ; Lb8, Lc8, Ld8, Le8, Lf8 et leur couvercles G, H, 1, J. Les charges sont fixées dans les couvercles par collage.Figure 3 is a cross section of the filter of Figures 1 and 2, at the height of the eighth side assembly, counting from the left end in Figure 1; this section shows the six secondary guides A8, B8, C8, D8, E8, F8 with their respective loads La8,; Lb8, Lc8, Ld8, Le8, Lf8 and their covers G, H, 1, J. The charges are fixed in the covers by gluing.
Le filtre qui vient d'être décrit est un filtre d'harmonique 2, destiné à passer une fréquence fondamentale comprise entre 17,3 et 18,1 GHz. Ses performances, pour une puissance d'essai de 1,3 kW, sont les suivantes : pour le fondamental les pertes sont de 0,11 dB et le rapport d'onde stationnaire est de 1,035 tandis que pour un harmonique 2 compris entre 34,6 et 36,2 GHz les pertes sont supérieures à 50 dB et le rapport d'onde stationnaire est de 1,23.The filter which has just been described is a
La réalisation de ce filtre a posé des problèmes ; en effet il avait été essayé de partir d'un filtre classique, à guides secondaires rectangulaires, et de remplacer simplement les guides secondaires rectangulaires par des guides circulaires ; mais il est apparu, en plus du mode TE 11, des modes parasites TE01 et TE02 (appelés TE10 et TE20 dans la littérature anglo-saxonne). L'explication de ce phénomène peut être recherchée dans le fait que les guides secondaires rectangulaires de l'art connu étaient d'une épaisseur faible devant leur largeur, ce qui faisait que leur section interne et donc leur trou de couplage au guide principal étaient faibles ; de ce fait il n'y avait pas création de perturbations dans le guide principal. Par contre, avec des guides secondaires cylindriques, les sections sont importantes, puisqu'il n'est plus possible de réduire une épaisseur sans réduire une largeur, et il en résulte des discontinuités importantes dans la paroi du guide principal ; ces discontinuités amènent un élargissement artificiel du guide principal ; de ce fait, la fréquence de coupure des deux premiers modes parasites TE01 et TE02 se trouve abaissée, ce qui crée des résonances parasites qui apparaissent, en particulier, dans la bande 17,3 - 18,1 GHz.The realization of this filter posed problems; indeed it had been tried to start from a conventional filter, with rectangular secondary guides, and to simply replace the rectangular secondary guides by circular guides; but it appeared, in addition to the TE 11 mode, parasitic modes TE01 and TE02 (called TE10 and TE20 in the Anglo-Saxon literature). The explanation of this phenomenon can be sought in the fact that the rectangular secondary guides of the known art were of small thickness compared to their width, which made that their internal section and therefore their hole for coupling to the main guide were small. ; therefore there was no creation of disturbances in the main guide. On the other hand, with cylindrical secondary guides, the sections are important, since it is no longer possible to reduce a thickness without reducing a width, and this results in significant discontinuities in the wall of the main guide; these discontinuities lead to an artificial widening of the main guide; therefore, the cutoff frequency of the first two parasitic modes TE01 and TE02 is lowered, which creates parasitic resonances which appear, in particular, in the band 17.3 - 18.1 GHz.
Il aurait été possible de réduire la dimension des trous de couplage de chacun des guides secondaires afin d'éviter ces perturbations ; mais, toujours en raison des dimensions transversales des guides secondaires cylindriques, il n'aurait pas été possible de disposer suffisamment de guides cylindriques pour capter la même quantité d'énergie par unité de longueur du filtre et ces filtres auraient été, pour les mêmes performances que des filtres à guide secondaires rectangulaires, de l'ordre de deux fois plus longs; dans la plupart des cas d'utilisation ce n'est pas acceptable.It would have been possible to reduce the dimension of the coupling holes of each of the secondary guides in order to avoid these disturbances; but, still due to the transverse dimensions of the cylindrical secondary guides, it would not have been possible to have enough cylindrical guides to capture the same amount of energy per unit length of the filter and these filters would have been, for the same performances than rectangular secondary guide filters, on the order of two times longer; in most use cases this is not acceptable.
La solution retenue pour éviter ces inconvénients est, comme il ressort de la description faite à raide des figures 1 à 3, de réduire non seulement l'épaisseur du guide principal mais également sa largeur et, accessoirement, de réduire progressivement le couplage des guides secondaires au voisinage des accès du filtre, le couplage étant d'autant plus faible que le guide secondaire est plus proche d'un accès.The solution adopted to avoid these drawbacks is, as is apparent from the stiff description of Figures 1 to 3, to reduce not only the thickness of the main guide but also its width and, incidentally, to progressively reduce the coupling of the secondary guides in the vicinity of the access points of the filter, the coupling being all the weaker the closer the secondary guide is to an access point.
La présente invention n'est pas limitée à l'exemple décrit, c'est ainsi que le guide principal du filtre peut m'être associé à des guides secondaires que par ses deux grands côtés ou même par un seul de ses grands côtés. De même le nombre de guides secondaires, s'il doit au moins être égal à 1, n'est limité supérieurement que par la place disponible pour le filtre; de plus il est possible de remplir les guides secondaires de diélectrique afin de réduire leur section sans augmenter leur fréquence de coupure ; il est également possible de répartir de différentes manières les guides secondaires le long du guide principal et, en particulier, la réprartitian peut ne pas étre régulière. Pour ce qui est des adaptateurs d'impédance aux accès du filtre, tels que 2 et 4 sur la figure 1, ils peuvent être du type raccord progressif ou raccord discontinu.The present invention is not limited to the example described, thus the main guide of the filter can be associated with secondary guides for me only by its two long sides or even by only one of its long sides. Likewise, the number of secondary guides, if it must at least be equal to 1, is limited only by the space available for the filter; moreover, it is possible to fill the secondary guides with dielectric in order to reduce their section without increasing their cut-off frequency; it is also possible to distribute the secondary guides in different ways along the main guide and, in particular, the reprartitian may not be regular. As for the impedance adapters at the filter ports, such as 2 and 4 in FIG. 1, they can be of the progressive fitting or discontinuous fitting type.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR8408496A FR2565416B1 (en) | 1984-05-30 | 1984-05-30 | MAIN WAVEGUIDE FILTER LOADED BY SIDE WAVEGUIDES |
FR8408496 | 1984-05-30 |
Publications (2)
Publication Number | Publication Date |
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EP0164050A1 true EP0164050A1 (en) | 1985-12-11 |
EP0164050B1 EP0164050B1 (en) | 1989-03-22 |
Family
ID=9304547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP85106515A Expired EP0164050B1 (en) | 1984-05-30 | 1985-05-28 | Filter with a main waveguide loaded with lateral waveguides |
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Country | Link |
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US (1) | US4578657A (en) |
EP (1) | EP0164050B1 (en) |
JP (1) | JPS612401A (en) |
DE (1) | DE3569068D1 (en) |
FR (1) | FR2565416B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2771857A1 (en) * | 1997-12-03 | 1999-06-04 | Thomson Csf | HIGH STRAIGHT HYPERFREQUENCY FILTER |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04348126A (en) * | 1991-03-15 | 1992-12-03 | Ube Ind Ltd | Production of polyether sulfone melt |
US6652990B2 (en) * | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
JPH0666105U (en) * | 1993-02-12 | 1994-09-16 | 島田理化工業株式会社 | Waveguide low-pass filter |
JP2007158713A (en) * | 2005-12-05 | 2007-06-21 | Shimada Phys & Chem Ind Co Ltd | Coaxial filter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1252509A (en) * | 1960-03-31 | 1961-01-27 | Thomson Houston Comp Francaise | Microwave filter |
DE2004730A1 (en) * | 1969-03-03 | 1970-09-24 | The Marconi Company Ltd., London | Waveguide bandstop filter |
FR2143780A1 (en) * | 1971-06-28 | 1973-02-09 | Siemens Ag | |
US4060778A (en) * | 1976-07-12 | 1977-11-29 | Microwave Research Corporation | Microwave harmonic absorption filter |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3187277A (en) * | 1962-05-14 | 1965-06-01 | Airtron Inc | Waveguide harmonic suppressor employing subsidiary waveguides, cut off for fundamental, for coupling main waveguide harmonics to absorber |
US3593220A (en) * | 1968-07-15 | 1971-07-13 | Varian Associates | High power microwave low-pass filter of the leaky wall type |
US3543199A (en) * | 1968-10-03 | 1970-11-24 | Us Air Force | Tapered mode selective absorber for use in high power waveguide systems |
-
1984
- 1984-05-30 FR FR8408496A patent/FR2565416B1/en not_active Expired
-
1985
- 1985-05-28 JP JP60115180A patent/JPS612401A/en active Pending
- 1985-05-28 EP EP85106515A patent/EP0164050B1/en not_active Expired
- 1985-05-28 DE DE8585106515T patent/DE3569068D1/en not_active Expired
- 1985-05-30 US US06/739,588 patent/US4578657A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1252509A (en) * | 1960-03-31 | 1961-01-27 | Thomson Houston Comp Francaise | Microwave filter |
DE2004730A1 (en) * | 1969-03-03 | 1970-09-24 | The Marconi Company Ltd., London | Waveguide bandstop filter |
FR2143780A1 (en) * | 1971-06-28 | 1973-02-09 | Siemens Ag | |
US4060778A (en) * | 1976-07-12 | 1977-11-29 | Microwave Research Corporation | Microwave harmonic absorption filter |
Non-Patent Citations (2)
Title |
---|
1976 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, 14 -16 juin 1976, Cherry Hill, pages 122-124, Digest of Technical Papers, IEEE, New York, US; R.V. SNYDER: "An improved low-pass harmonic absorber" * |
TELECOMMUNICATION AND RADIO ENGINEERING, vol. 33/34, no. 1, janvier 1979, pages 62-65, Scripta Publishing Co., Washington, US; V.I. VOL'MAN et al.: "Absorption-type filter for high-power levels" * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2771857A1 (en) * | 1997-12-03 | 1999-06-04 | Thomson Csf | HIGH STRAIGHT HYPERFREQUENCY FILTER |
EP0921587A1 (en) * | 1997-12-03 | 1999-06-09 | Thomson-Csf | Microwave filter with a steep upper edge |
Also Published As
Publication number | Publication date |
---|---|
FR2565416B1 (en) | 1987-06-26 |
EP0164050B1 (en) | 1989-03-22 |
DE3569068D1 (en) | 1989-04-27 |
FR2565416A1 (en) | 1985-12-06 |
US4578657A (en) | 1986-03-25 |
JPS612401A (en) | 1986-01-08 |
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