EP0069651A1 - Resonator filter with an adjustable pole in infinite attenuation - Google Patents

Resonator filter with an adjustable pole in infinite attenuation Download PDF

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Publication number
EP0069651A1
EP0069651A1 EP82401205A EP82401205A EP0069651A1 EP 0069651 A1 EP0069651 A1 EP 0069651A1 EP 82401205 A EP82401205 A EP 82401205A EP 82401205 A EP82401205 A EP 82401205A EP 0069651 A1 EP0069651 A1 EP 0069651A1
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EP
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Prior art keywords
resonators
plate
filter
coupled
separate
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Granted
Application number
EP82401205A
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German (de)
French (fr)
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EP0069651B1 (en
Inventor
Marie-Christine Henriot
Patrick Janer
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Thales SA
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Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities

Definitions

  • the present invention relates to microwave filters comprising resonators arranged in line between the input and the output of the filter and in which two nonadjacent resonators are coupled by a conductive plate of elongated shape, having its two ends situated, respectively, at the vicinity of these two nonadjacent resonators and having a curvature whose concavity is turned towards the resonators situated between the two nonadjacent resonators.
  • Such filters are known for example from German patent application 2 218 277.
  • the position of the conductive plate is determined during the production of the filter and can only be modified subsequently by opening the housing of the filter and by changing the thickness of insulating parts which determine the position of the conductive plate in relation to the resonators.
  • the present invention aims to provide a filter where the adjustment of the position of the metal plate does not require the opening of the housing. This is mainly achieved by using an elastic conductive plate and an insulating screw which passes through the filter housing and comes to bear on the plate.
  • a microwave filter comprising n resonators (n integer at least equal to 3) arranged in line between the input and the output of the filter and in which at least two non-adjacent resonators, which will be said to be separate coupled resonators , are coupled by an elongated conductive plate, having its two ends located, respectively, in the vicinity of two separate-coupled resonators and having a curvature whose concavity is turned towards those of the n-2 other resonators located between the two separate resonators -coupled, is characterized in that the plate is an elastic plate and in that an insulating adjustment screw passing through the wall of the filter housing, allows the position of one of the ends of the plate to be adjusted relative to the 'one of the separate-coupled resonators coming to press on the considered end of the plate.
  • One of the ends, 7, of the plate is made integral with the resonator R 1 by a weld, 20, between the flat fold 10 and this resonator.
  • the plate 6 is therefore electrically connected to the resonator R 1 .
  • the other end 8 of the plate has its flat fold 9 located at a distance d above the resonator R 4 ; the distance d is much less than the distance D.

Abstract

1. A filter with n resonators (n being an integer at least equal to 3) disposed in a series configuration between the input and the output of the filter and in which two non-adjacent resonators at least, which will be called separated-coupled resonators, are coupled via a conductive plate (6) of elongated form, this plate having its two ends (7, 8) situated respectively in the neighbourhood of the two separated-coupled resonators (R1 , R4 ) and presenting a curved shape, the concavity of which is turned towards those (R2 , R3 ) of the n-2 remaining resonators situated between the two separated-coupled resonators, characterized in that the plate (6) is a resilient plate, one point of which is fixed and one of the ends of which is free, and in that an insulating adjusting screw (19), which passes through the wall of the filter casing, permits the adjustment of the position of the free end (8) of the plate with respect to one (R4 ) of the separated-coupled resonators by pressing on the plate.

Description

La présente invention se rapporte aux filtres hyperfréquences comportant des résonateurs disposés à la file entre l'entrée et la sortie du filtre et dans lesquels deux résonateurs non adjacents sont couplés par une plaque conductrice de forme allongée, ayant ses deux extrémités situées, respectivement, au voisinage de ces deux résonateurs non adjacents et présentant une courbure dont la concavité est tournée vers les résonateurs situés entre les deux résonateurs non adjacents.The present invention relates to microwave filters comprising resonators arranged in line between the input and the output of the filter and in which two nonadjacent resonators are coupled by a conductive plate of elongated shape, having its two ends situated, respectively, at the vicinity of these two nonadjacent resonators and having a curvature whose concavity is turned towards the resonators situated between the two nonadjacent resonators.

De tels filtres sont connus par exemple par la demande de brevet allemand 2 218 277. Dans ces filtres connus la position de la plaque conductrice est déterminée lors de la réalisation du filtre et ne peut être modifiée par la suite qu'en ouvrant le boîtier du filtre et en changeant l'épaisseur de pièces isolantes qui déterminent la position de la plaque conductrice par rapport aux résonateurs.Such filters are known for example from German patent application 2 218 277. In these known filters the position of the conductive plate is determined during the production of the filter and can only be modified subsequently by opening the housing of the filter and by changing the thickness of insulating parts which determine the position of the conductive plate in relation to the resonators.

La présente invention a pour but de proposer un filtre où le réglage de la position de la plaque métallique ne nécessite pas l'ouverture du boîtier. Ceci est obtenu principalement en utilisant une plaque conductrice élastique et une vis isolante qui traverse le boîtier du filtre et vient en appui sur la plaque.The present invention aims to provide a filter where the adjustment of the position of the metal plate does not require the opening of the housing. This is mainly achieved by using an elastic conductive plate and an insulating screw which passes through the filter housing and comes to bear on the plate.

Selon l'invention, un filtre hyperfréquence comportant n résonateurs (n entier au moins égal à 3) disposés à la file entre l'entrée et la sortie du filtre et dans lequel deux résonateurs non adjacents, au moins, qui seront dits résonateurs séparés couplés, sont couplés par une plaque conductrice de forme allongée, ayant ses deux extrémités situées, respectivement, au voisinage de deux résonateurs séparés-couplés et présentant une courbure dont la concavité est tournée vers ceux des n-2 autres résonateurs situés entre les deux résonateurs séparés-couplés, est caractérisé en ce que la plaque est une plaque élastique et en ce qu'une vis isolante de réglage traversant la paroi du boîtier du filtre, permet le réglage de la position d'une des extrémités de la plaque par rapport à l'un des résonateurs séparés-couplés en venant appuyer sur l'extrémité considérée de la plaque.According to the invention, a microwave filter comprising n resonators (n integer at least equal to 3) arranged in line between the input and the output of the filter and in which at least two non-adjacent resonators, which will be said to be separate coupled resonators , are coupled by an elongated conductive plate, having its two ends located, respectively, in the vicinity of two separate-coupled resonators and having a curvature whose concavity is turned towards those of the n-2 other resonators located between the two separate resonators -coupled, is characterized in that the plate is an elastic plate and in that an insulating adjustment screw passing through the wall of the filter housing, allows the position of one of the ends of the plate to be adjusted relative to the 'one of the separate-coupled resonators coming to press on the considered end of the plate.

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

  • - la figure 1 un filtre selon l'invention, capot ouvert
  • - la figure 2 une coupe partielle du filtre selon la figure 1.
The present invention will be better understood and other characteristics will appear with the aid of the description below and of the figures relating thereto which represent:
  • - Figure 1 a filter according to the invention, open cover
  • - Figure 2 a partial section of the filter according to Figure 1.

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

Le filtre selon la figure 1 comprend une cavité métallique, 1, dans laquelle sont placés quatre résonateurs, R1 à R4, formés de tronçons de ligne. Ce filtre est du type filtre en peigne du fait de la disposition de ses résonateurs. La cavité 1 est un boîtier métallique comportant un fond 2 solidaire de quatre parois verticales, et un capot 5; les résonateurs sont tubulaires et sont parallèles entre eux. Le nombre des résonateurs permet de déterminer le nombre de pôles de la fonction de transfert amplitude/fréquence. Ce filtre comporte en plus un adaptateur d'impédance d'entrée ZE et un adaptateur d'impédance de sortie ZS. Chaque résonateur est fixé par une première extrémité à un côté vertical, 3, du boîtier, et est couplé, à sa seconde extrémité, au côté vertical opposé, 4, par un couplage capacitif, C à C4. Les couplages capacitifs sont réalisés par des tiges filetées conductrices qui pénètrent chacune en partie à l'intérieur de chaque résonateur sans les toucher du côté ou le potentiel est non nul c'est-à-dire par l'extrémité opposée au côté 3 du boîtier. Chaque tige est accessible de l'extérieur du boîtier et peut être vissée ou dévissée pour obtenir la fréquence d'accord de chaque résonateur. Les tiges permettent donc de faire varier la capacité d'accord correspondante. L'entrée E du filtre est prise sur le côté vertical 3. L'adaptateur d'impédance d'entrée ZE est un tronçon de ligne conducteur placé en amont du premier résonateur, R1. Cet adaptateur ZE est relié à l'entrée E par l'une de ses extrémités et est relié à la masse par l'autre extrémité. La sortie S du filtre est prise sur le côté vertical 3. L'adaptateur ZS est un tronçon- de ligne conducteur placé en aval du résonateur R4. Cet adaptateur ZS est relié à la sortie S par l'une de ses extrémités et est relié à la masse par l'autre extrémité.The filter according to Figure 1 comprises a metal cavity, 1, in which are placed four resonators, R 1 to R 4 , formed of line sections. This filter is of the comb filter type due to the arrangement of its resonators. The cavity 1 is a metal case comprising a bottom 2 secured to four vertical walls, and a cover 5; the resonators are tubular and are parallel to each other. The number of resonators makes it possible to determine the number of poles of the amplitude / frequency transfer function. This filter additionally includes a ZE input impedance adapter and a ZS output impedance adapter. Each resonator is fixed by a first end to a vertical side, 3, of the housing, and is coupled, at its second end, to the opposite vertical side, 4, by a capacitive coupling, C to C 4 . The capacitive couplings are produced by conductive threaded rods which each partially penetrate inside each resonator without touching them on the side where the potential is not zero, that is to say by the end opposite to the side 3 of the housing. . Each rod is accessible from outside the housing and can be screwed or unscrewed to obtain the tuning frequency of each resonator. The rods therefore make it possible to vary the corresponding tuning capacity. The filter input E is taken on the vertical side 3. The input impedance adapter ZE is a section of conductive line placed upstream of the first resonator, R 1 . This adapter ZE is connected to the input E by one of its ends and is connected to the ground by the other end. The output S of the filter is taken on the vertical side 3. The adapter ZS is a section of conductive line placed downstream of the resonator R 4 . This adapter ZS is connected to the output S by one of its ends and is connected to the ground by the other end.

Le domaine des fréquences de filtrage d'un tel filtre peut aller de 500 Mhz jusqu'à quelques GHz.The filtering frequency range of such a filter can range from 500 MHz to a few GHz.

Dans la réalisation décrite la fréquence centrale Fc était de l'ordre de 825 MHz et la bande passante ΔF de l'ordre de 10 % de la fréquence centrale. D'autre part une réponse amplitude/fréquence selon Tchebycheff a été choisie qui présentent donc un minimum d'ondulation dans la bande passante. Les résonateurs présentent des couplages primaires entre eux. Ces couplages primaires entre résonateurs adjacents sont généralement capacitifs et fonction de la distance séparant les deux résonateurs adjacents. Cette distance a été choisie de façon à obtenir la fonction de filtrage désirée.In the embodiment described, the central frequency Fc was of the order of 825 MHz and the passband ΔF of the order of 10% of the central frequency. On the other hand, an amplitude / frequency response according to Tchebycheff was chosen which therefore have a minimum of ripple in the bandwidth. The resonators have primary couplings between them. These primary couplings between adjacent resonators are generally capacitive and a function of the distance separating the two adjacent resonators. This distance was chosen so as to obtain the desired filtering function.

Le filtre des figures 1 et 2 comporte également une plaque conductrice 6 qui sert à créer un couplage secondaire entre les deux résonateurs non adjacents R1 et R4. La plaque 6 est une plaque allongée présentant une certaine élasticité. Comme cela apparaît sur les figures 1 et 2 cette plaque est solidaire du résonateur R1. Cette plaque est placée à une distance D des résonateurs R2 R3 suffisante pour qu'il n'y ait pratiquement pas de couplage avec ces résonateurs. Les extrémités 7 et 8 de la plaque 6 sont recourbées et présentent des replis plats 9 et 10 en face respectivement des résonateurs R et R4. L'une des extrémités, 7, de la plaque est rendue solidaire du résonateur R1 par une soudure, 20, entre le repli plat 10 et ce résonateur. La plaque 6 se trouve donc reliée électriquement au résonateur R1. L'autre extrémité 8 de la plaque a son repli plat 9 situé à une distance d au-dessus du résonateur R4; la distance d est très inférieure à la distance D.The filter of FIGS. 1 and 2 also includes a conductive plate 6 which is used to create a secondary coupling between the two non-adjacent resonators R 1 and R 4 . The plate 6 is an elongated plate having a certain elasticity. As shown in FIGS. 1 and 2, this plate is integral with the resonator R 1 . This plate is placed at a distance D from the resonators R 2 R 3 sufficient for there to be practically no coupling with these resonators. The ends 7 and 8 of the plate 6 are curved and have flat folds 9 and 10 opposite the resonators R and R 4 respectively . One of the ends, 7, of the plate is made integral with the resonator R 1 by a weld, 20, between the flat fold 10 and this resonator. The plate 6 is therefore electrically connected to the resonator R 1 . The other end 8 of the plate has its flat fold 9 located at a distance d above the resonator R 4 ; the distance d is much less than the distance D.

Le capot 5 est percé d'un trou fileté, 19a, qui est situé au-dessus du résonateur R4 quand le capot 5 est fermé. Le trou fileté 19a traverse le capot 5 et permet le passage d'une vis isolante 19. La tête de la vis 19 se trouve à l'extérieur du filtre, son corps est vissé dans le trou 19a et son extrémité se trouve en contact avec le repli plat 9 de la plaque. Ce contact est guidé au moyen d'un pivot 8a fixé au repli plat 9, perpendiculaire à ce repli plat et pénétrant à l'intérieur de la vis 19 dans un logement réalisé à cet effet.The cover 5 is pierced with a threaded hole, 19a, which is located above the resonator R 4 when the cover 5 is closed. The threaded hole 19a passes through the cover 5 and allows the passage of an insulating screw 19. The head of the screw 19 is located outside the filter, its body is screwed into the hole 19a and its end is in contact with the flat fold 9 of the plate. This contact is guided by means of a pivot 8a fixed to the flat fold 9, perpendicular to this flat fold and penetrating inside the screw 19 in a housing made for this purpose.

La vis 19 permet donc, par vissage ou dévissage et grâce à l'élasticité de la plaque 6, de rapprocher ou d'éloigner le repli plat 9 de la plaque 6 du résonateur R4 et ceci afin de faire varier le couplage secondaire réalisé entre le résonateur R et le résonateur R4; il est possible ainsi de déplacer la pointe d'affaiblissement infini, obtenue par le couplage secondaire, dans une bande de fréquences comprises entre la fréquence de coupure du filtre délimitant la bande utile et une fréquence supérieure à cette fréquence de coupure.The screw 19 therefore makes it possible, by screwing or unscrewing and thanks to the elasticity of the plate 6, to bring the flat fold 9 closer to or away from the plate 6 of the resonator R 4 and this in order to vary the secondary coupling produced between the resonator R and the resonator R 4 ; it is thus possible to move the infinite weakening point, obtained by the secondary coupling, in a frequency band between the cut-off frequency of the filter defining the useful band and a frequency higher than this cut-off frequency.

La présente invention n'est pas limitée à l'exemple décrit, c'est ainsi qu'il est possible de réaliser, dans un même filtre, plusieurs couplages secondaires entre résonateurs non adjacents afin d'obtenir plusieurs pointes d'affaiblissement infini et donc de prévoir plusieurs réglages par plaque élastique et vis isolante. De même, la présente invention s'applique à tous les filtres hyperfréquence comportant plus de deux résonateurs disposés à la file, ces résonateurs pouvant être tout aussi bien des tronçons de ligne que des résonateurs en diélectrique.The present invention is not limited to the example described, this is how it is possible to produce, in the same filter, several secondary couplings between nonadjacent resonators in order to obtain several peaks of infinite attenuation and therefore to provide several adjustments by elastic plate and insulating screw. Likewise, the present invention applies to all microwave filters comprising more than two resonators arranged in a line, these resonators can be just as much line sections as dielectric resonators.

De même il est possible de prévoir, en variante, une plaque conductrice du genre de la plaque 6 mais qui serait libre à ses deux extrémités et fixée, en son milieu, au capot 5 par un dispositif isolant ; le réglage de la position de chacune ou de l'une des deux extrémités de la plaque par rapport aux résonateurs correspondants s'effectue par une vis isolante du genre de la vis 19.Similarly, it is possible to provide, as a variant, a conductive plate of the type of plate 6 but which would be free at its two ends and fixed, in its middle, to the cover 5 by an insulating device; the position of each or one of the two ends of the plate is adjusted relative to the corresponding resonators by an insulating screw of the type of screw 19.

Claims (2)

1. Filtre comportant n résonateurs (n entier au moins égal à 3) disposés à la file entre l'entrée et la sortie du filtre et dans lequel deux résonateurs non adjacents, au moins, qui seront dits résonateurs séparés couplés, sont couplés par une plaque conductrice (6) de forme allongée, ayant ses deux extrémités (7, 8) situées, respectivement, au voisinage des deux résonateurs séparés-couplés (R1, R4) et présentant une courbure dont la concavité est tournée vers ceux (R2, R3) des n-2 autres résonateurs situés entre les deux résonateurs séparés-couplés, caractérisé en ce que la plaque (6) est une plaque élastique et en ce qu'une vis isolante de réglage (19) traversant la paroi du boîtier du filtre, permet le réglage de la position d'une des extrémités (8) de la plaque par rapport à l'un (R4) des résonateurs séparés-couplés en venant appuyer sur l'extrémité considérée de la plaque.1. Filter comprising n resonators (n integer at least equal to 3) arranged in line between the input and the output of the filter and in which at least two nonadjacent resonators, which will be called separate coupled resonators, are coupled by a conductive plate (6) of elongated shape, having its two ends (7, 8) located, respectively, in the vicinity of the two separate-coupled resonators (R 1 , R 4 ) and having a curvature whose concavity is turned towards those (R2 , R 3 ) n-2 other resonators located between the two separate-coupled resonators, characterized in that the plate (6) is an elastic plate and in that an insulating adjustment screw (19) passing through the wall of the housing of the filter, allows the position of one of the ends (8) of the plate to be adjusted relative to one (R 4 ) of the separate-coupled resonators by pressing on the considered end of the plate. 2. Filtre selon la revendication 1, caractérisé en ce que la plaque (6) est en contact, à l'une de ses extrémités, avec l'un (R 1) des résonateurs séparés couplés (R1, R4) grâce à un dispositif de fixation (20).2. Filter according to claim 1, characterized in that the plate (6) is in contact, at one of its ends, with one (R 1 ) of the separate coupled resonators (R 1 , R 4 ) thanks to a fixing device (20).
EP19820401205 1981-07-07 1982-06-29 Resonator filter with an adjustable pole in infinite attenuation Expired EP0069651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113321 1981-07-07
FR8113321A FR2509536A1 (en) 1981-07-07 1981-07-07 HYPERFREQUENCY FILTER COMPRISING COUPLINGS BETWEEN LINE TRUNCTIONS AND MEANS FOR ADJUSTING

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EP0069651A1 true EP0069651A1 (en) 1983-01-12
EP0069651B1 EP0069651B1 (en) 1986-01-08

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JP (1) JPS5816902U (en)
DE (1) DE3268387D1 (en)
FR (1) FR2509536A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093956A2 (en) * 1982-05-10 1983-11-16 Oki Electric Industry Company, Limited A dielectric filter
EP0285503A1 (en) * 1987-03-31 1988-10-05 Thomson-Csf Filter with distributed constant elements associating two kinds of coupling arrangements
EP0322780A2 (en) * 1987-12-28 1989-07-05 Oki Electric Industry Company, Limited Dielectric filter with attenuation pole
EP0324512A2 (en) * 1982-05-10 1989-07-19 Oki Electric Industry Company, Limited A dielectric filter
EP0334270A1 (en) * 1988-03-23 1989-09-27 Alcatel Telspace Microwave matching arrangement for a waveguide-to-planar line transition
FR2639776A1 (en) * 1988-11-30 1990-06-01 Thomson Hybrides Passive band-pass filter
GB2253522A (en) * 1991-01-11 1992-09-09 Solitra Oy Method of tuning a filter.
EP1324419A3 (en) * 2001-12-17 2003-09-03 Radio Frequency Systems, Inc. System for cross-coupling resonators
CN105556839A (en) * 2013-09-27 2016-05-04 英特尔公司 Multiresonator non-adjacent coupling
US10056666B2 (en) 2014-05-23 2018-08-21 Tongyu Technology Oy Tuning element for radio frequency resonator
CN110770970A (en) * 2018-03-23 2020-02-07 深圳市大富科技股份有限公司 Filter and communication equipment

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DE2218277A1 (en) * 1972-04-15 1973-10-31 Licentia Gmbh MICROWAVE FILTER, COMPOSED OF BETWEEN PARALLEL PLATES, RESONATORS LOCATED BACK TO ONE IN THE REPRODUCTION DIRECTION OF THE WAVE

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FR1075057A (en) * 1953-02-26 1954-10-12 Csf Improvements to delay lines with variable characteristics
GB752142A (en) * 1953-05-20 1956-07-04 Radio Electr Soc Fr Improvements in or relating to band-pass filters for ultra-high frequencies
FR1415052A (en) * 1963-10-29 1965-10-22 Litton Industries Inc Forward-advancing broadband wave amplifier
DE1918356A1 (en) * 1969-04-11 1970-10-15 Licentia Gmbh Microwave comb filter
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324512A2 (en) * 1982-05-10 1989-07-19 Oki Electric Industry Company, Limited A dielectric filter
EP0093956A3 (en) * 1982-05-10 1985-08-07 Oki Electric Industry Company, Limited A dielectric filter
EP0093956A2 (en) * 1982-05-10 1983-11-16 Oki Electric Industry Company, Limited A dielectric filter
EP0324512A3 (en) * 1982-05-10 1989-07-26 Oki Electric Industry Company, Limited A dielectric filter
US4992759A (en) * 1987-03-31 1991-02-12 Thomson-Csf Filter having elements with distributed constants which associate two types of coupling
FR2613557A1 (en) * 1987-03-31 1988-10-07 Thomson Csf FILTER COMPRISING CONSTANT DISTRIBUTED ELEMENTS ASSOCIATING TWO TYPES OF COUPLING
EP0285503A1 (en) * 1987-03-31 1988-10-05 Thomson-Csf Filter with distributed constant elements associating two kinds of coupling arrangements
EP0322780A2 (en) * 1987-12-28 1989-07-05 Oki Electric Industry Company, Limited Dielectric filter with attenuation pole
EP0322780A3 (en) * 1987-12-28 1990-07-18 Oki Electric Industry Company, Limited Dielectric filter with attenuation pole
EP0334270A1 (en) * 1988-03-23 1989-09-27 Alcatel Telspace Microwave matching arrangement for a waveguide-to-planar line transition
FR2629276A1 (en) * 1988-03-23 1989-09-29 Alcatel Thomson Faisceaux HYPERFREQUENCY ADJUSTMENT DEVICE FOR PLANAR WAVE-LINE TRANSITION TRANSITION
US4970477A (en) * 1988-03-23 1990-11-13 Alcatel N.V. Microwave adjustment device for a transition between a hollow waveguide and a plane transmission line
FR2639776A1 (en) * 1988-11-30 1990-06-01 Thomson Hybrides Passive band-pass filter
GB2253522A (en) * 1991-01-11 1992-09-09 Solitra Oy Method of tuning a filter.
US6642814B2 (en) * 2001-12-17 2003-11-04 Alcatel, Radio Frequency Systems, Inc. System for cross coupling resonators
EP1324419A3 (en) * 2001-12-17 2003-09-03 Radio Frequency Systems, Inc. System for cross-coupling resonators
CN105556839A (en) * 2013-09-27 2016-05-04 英特尔公司 Multiresonator non-adjacent coupling
EP3050212A1 (en) * 2013-09-27 2016-08-03 Intel Corporation Multiresonator non-adjacent coupling
EP3050212A4 (en) * 2013-09-27 2017-05-03 Intel Corporation Multiresonator non-adjacent coupling
US9692098B2 (en) 2013-09-27 2017-06-27 Intel Corporation Multi resonator non-adjacent coupling
EP3203633A3 (en) * 2013-09-27 2017-12-27 Intel Corporation Multiresonator non-adjacent coupling
US9876262B2 (en) 2013-09-27 2018-01-23 Intel Corporation Multi resonator non-adjacent coupling
CN105556839B (en) * 2013-09-27 2018-08-24 英特尔公司 Multi-resmator cross-coupling
US10056666B2 (en) 2014-05-23 2018-08-21 Tongyu Technology Oy Tuning element for radio frequency resonator
CN110770970A (en) * 2018-03-23 2020-02-07 深圳市大富科技股份有限公司 Filter and communication equipment

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FR2509536B1 (en) 1984-11-30
JPS5816902U (en) 1983-02-02
FR2509536A1 (en) 1983-01-14
DE3268387D1 (en) 1986-02-20
EP0069651B1 (en) 1986-01-08

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