EP0205151A1 - Evanescent-mode microwave band-pass filter - Google Patents

Evanescent-mode microwave band-pass filter Download PDF

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Publication number
EP0205151A1
EP0205151A1 EP86107876A EP86107876A EP0205151A1 EP 0205151 A1 EP0205151 A1 EP 0205151A1 EP 86107876 A EP86107876 A EP 86107876A EP 86107876 A EP86107876 A EP 86107876A EP 0205151 A1 EP0205151 A1 EP 0205151A1
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EP
European Patent Office
Prior art keywords
antenna
filter
evanescent
pass filter
microwave band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86107876A
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German (de)
French (fr)
Inventor
Marc Sauvage
Marie-Christine Henriot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Transmission par Faisceaux Hertziens SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
Alcatel Transmission par Faisceaux Hertziens SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Thomson Faisceaux Hertziens SA, Alcatel Transmission par Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0205151A1 publication Critical patent/EP0205151A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • H01P1/219—Evanescent mode filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling

Definitions

  • the present invention relates to a microwave bandpass filter guide "under the cut", said evanescent mode, said filter also being tunable in a frequency range and having at least one access of coaxial type.
  • Figure 1 attached diagrammatically represents a tunable bandpass filter in evanescent mode of known type.
  • reference 1 designates the filter housing, in the form of a waveguide: circular closed by two bottom plates 2 and 3.
  • References 4 to 7 designate four tunable resonators, each composed of a fixed part ( 40, 50, 60, 70) and a movable adjustment part (41, 51, 61, 71), forming the four poles of the bandpass filter, while the references 8, 9 and 10 designate the adjustment screws couplings between adjacent resonators.
  • references 11 and 12 respectively designate the inlet and outlet ports of the filter, conventionally composed of a coaxial base (110, 120), for example of the SMA type, and of a rigid wire (111, 121) forming antenna and whose end opposite to the coaxial base is welded in the - housing 1.
  • the matching of the filter shown in FIG. 1 is conventionally obtained on the one hand by adjusting the distance between the fixed parts (40, 50, 60, 70) of the resonators (4, 5, 6, 7) and their moving parts. (41, 51, 61, 71), and on the other hand by adjusting the couplings between these resonators by driving in more or less the adjusting screws 8, 9 and 10.
  • each access antenna and its adjacent resonator is therefore, in this type of known device, optimized by construction in the middle of the frequency range, which results in a degradation of the properties of the filter at the ends of this frequency range.
  • the subject of the invention is a bandpass filter with evanescent mode continuously adjustable in a wide frequency band, said adjustment being fine and progressive, and making it possible to obtain, in said frequency band, optimized filtering properties. It is characterized in that its coaxial ports are each equipped with a coupling antenna in the form of a crankshaft and in that it is equipped with means making it possible to adjust the coupling between said antenna and said filter by rotating said antenna around its longitudinal axis.
  • Figure 2 which is a sectional view of a four-pole microwave bandpass filter, tunable and operating in evanescent mode, according to the invention, the elements identical to those of Figure 1 previously described have been designated by the same reference numbers, and will therefore not be described again.
  • the filter which has just been described has the possibility of coupling between the ports 21, 22 and the adjacent resonators 4, 7, with fine and continuous adjustment.
  • the access in question is released in rotation, 21 for example, by loosening the screw 17, then the crankshaft antenna 15 is rotated, using the nut 16, until that the coupling has thus been adjusted to the desired value.
  • the antenna 15 is then again blocked by tightening the screw 17.
  • the antenna 15 was made of non-annealed beryllium bronze, with a thin surface layer (a few microns thick) in gold, ensuring good electrical conductivity.
  • the crankshaft shape of the antenna 15 was produced by folding in a mold, which ensures very good reproducibility. Due to the elasticity of the non-annealed beryllium bronze, it was possible to force the antenna 15 into the guide 1 through the hole where the insulating tube 14 is housed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

Filtre passe-bande hyperfréquences, en guide (1) sous la coupure, dit à mode évanescent, ledit filtre étant par ailleurs accordable dans une gamme de fréquences et ayant au moins un accès (21, 22) de type coaxial.Les dispositifs d'accès sont chacun équipés d'une antenne de couplage (15) en forme de vilebrequin, cette antenne pouvant tourner autour de son axe longitudinal.Microwave band-pass filter, in guide (1) under the cut-off, said to be in evanescent mode, said filter being moreover tunable in a range of frequencies and having at least one port (21, 22) of the coaxial type. ports are each equipped with a coupling antenna (15) in the form of a crankshaft, this antenna being able to rotate around its longitudinal axis.

Description

La présente invention se rapporte à un filtre passe-bande hyperfréquences en guide "sous la coupure", dit à mode évanescent, ledit filtre étant par ailleurs accordable dans une gamme de fréquences et ayant au moins un accès de type coaxial.The present invention relates to a microwave bandpass filter guide "under the cut", said evanescent mode, said filter also being tunable in a frequency range and having at least one access of coaxial type.

La figure 1 .jointe représente schématiquement un filtre passe-bande accordable à mode évanescent de type connu. Sur cette figure, la référence 1 désigne le boîtier du filtre, en forme de guide d'ondes :circulaire fermé par deux plaques de fond 2 et 3. Les références 4 à 7 désignent quatre résonateurs accordables, composés chacun d'une partie fixe (40, 50, 60, 70) et d'une partie mobile de réglage (41, 51, 61, 71), formant les quatre pôles du filtre passe-bande, tandis que les références 8, 9 et 10 désignent les vis de réglage des couplages entre résonateurs adjacents. Enfin les références 11 et 12 désignent respectivement les accès d'entrée et de sortie du filtre, composés classiquement d'une embase coaxiale (110, 120), par exemple de type SMA, et d'un fil rigide (111, 121) formant antenne et dont l'extrémité opposée à l'embase coaxiale est soudée dans le - boîtier 1.Figure 1 . attached diagrammatically represents a tunable bandpass filter in evanescent mode of known type. In this figure, reference 1 designates the filter housing, in the form of a waveguide: circular closed by two bottom plates 2 and 3. References 4 to 7 designate four tunable resonators, each composed of a fixed part ( 40, 50, 60, 70) and a movable adjustment part (41, 51, 61, 71), forming the four poles of the bandpass filter, while the references 8, 9 and 10 designate the adjustment screws couplings between adjacent resonators. Finally, the references 11 and 12 respectively designate the inlet and outlet ports of the filter, conventionally composed of a coaxial base (110, 120), for example of the SMA type, and of a rigid wire (111, 121) forming antenna and whose end opposite to the coaxial base is welded in the - housing 1.

L'accord du filtre représenté sur la figure 1 s'obtient classiquement d'une part en réglant la distance entre les parties fixes (40, 50, 60, 70) des résonateurs (4, 5, 6, 7) et leurs parties mobiles (41, 51, 61, 71), et d'autre part en réglant les couplages entre ces résonateurs en enfonçant plus ou moins les vis de réglage 8, 9 et 10.The matching of the filter shown in FIG. 1 is conventionally obtained on the one hand by adjusting the distance between the fixed parts (40, 50, 60, 70) of the resonators (4, 5, 6, 7) and their moving parts. (41, 51, 61, 71), and on the other hand by adjusting the couplings between these resonators by driving in more or less the adjusting screws 8, 9 and 10.

Avec ce type de filtre connu, l'accord obtenu ainsi n'est pas toujours optimal, car, pour qu'il en soit ainsi, il faudrait en outre ajuster le couplage entre chacun des accès (11, 12) et le résonateur adjacent (4, 7), ce qui n'est visiblement pas possible car ce couplage dépend de la distance entre chaque antenne d'accès (111, 121) et le résonateur le plus proche (4, 7), distance qui est fixe par construction. Il n'est pas non plus possible, par manque de place, d'introduire une vis de réglage entre chaque antenne et son résonateur adjacent.With this type of known filter, the agreement obtained in this way is not always optimal, because, for this to be so, the coupling between each of the ports (11, 12) and the adjacent resonator would have to be adjusted ( 4, 7), which is obviously not possible because this coupling depends on the distance between each access antenna (111, 121) and the nearest resonator (4, 7), which distance is fixed by construction. It is also not possible, for lack of space, to introduce an adjustment screw between each antenna and its adjacent resonator.

Le couplage entre chaque antenne d'accès et son résonateur adjacent est donc, dans ce genre de dispositif connu, optimisé par construction au milieu de la gamme de fréquences, ce qui entraîne une dégradation des propriétés du filtre aux extrémités de cette gamme de fréquences. Pour obtenir des filtres gardant de bonnes caractéristiques, on est alors obligé, en divisant la gamme de fréquences en plusieurs sous-bandes, de réaliser plusieurs filtres, - un par sous-bande, ce qui complique considérablement l'installation de filtrage et en augmente par suite le prix de revient.The coupling between each access antenna and its adjacent resonator is therefore, in this type of known device, optimized by construction in the middle of the frequency range, which results in a degradation of the properties of the filter at the ends of this frequency range. To obtain filters with good characteristics, it is then necessary, by dividing the frequency range into several sub-bands, to produce several filters, - one per sub-band, which considerably complicates the filtering installation and increases it consequently the cost price.

L'invention a pour objet un filtre passe-bande à mode évanescent réglable continûment dans une large bande de fréquence, ledit réglage étant fin et progressif, et permettant d'obtenir, dans ladite bande de fréquence, des propriétés de filtrage optimisées. Il est caractérisé en ce que ses accès coaxiaux sont chacun équipés d'une antenne de couplage en forme de vilebrequin et en ce qu'il est équipé de moyens permettant de régler le couplage entre ladite antenne et ledit filtre en faisant tourner ladite antenne autour de son axe longitudinal.The subject of the invention is a bandpass filter with evanescent mode continuously adjustable in a wide frequency band, said adjustment being fine and progressive, and making it possible to obtain, in said frequency band, optimized filtering properties. It is characterized in that its coaxial ports are each equipped with a coupling antenna in the form of a crankshaft and in that it is equipped with means making it possible to adjust the coupling between said antenna and said filter by rotating said antenna around its longitudinal axis.

L'invention sera mieux comprise à l'aide de la description suivante d'un exemple de réalisation, en référence aux dessins annexés dans lesquels :

  • - la figure 1, déjà décrite précédemment, est une vue en coupe d'un filtre passe-bande hyperfréquences, accordable et fonctionnant en mode évanescent, de l'art antérieur,
  • - la figure 2 est une vue, semblable à celle de la figure 1, d'un filtre conforme à l'invention,
  • - la figure 3 est une vue éclatée d'un des dispositifs d'accès équipant le filtre de la figure 2,
  • - la figure 4 est une vue partielle en perspective du filtre de la figure 2, fond enlevé.
The invention will be better understood with the aid of the following description of an exemplary embodiment, with reference to the appended drawings in which:
  • FIG. 1, already described above, is a sectional view of a microwave band-pass filter, tunable and operating in evanescent mode, of the prior art,
  • FIG. 2 is a view, similar to that of FIG. 1, of a filter according to the invention,
  • FIG. 3 is an exploded view of one of the access devices fitted to the filter of FIG. 2,
  • - Figure 4 is a partial perspective view of the filter of Figure 2, bottom removed.

Sur la figure 2, qui est une vue en coupe d'un filtre passe-bande hyperfréquences à quatre pôles, accordable et fonctionnant en mode évanescent, conforme à l'invention, les éléments identiques à ceux de la figure 1 précédemment décrits y ont été désignés par les mêmes chiffres de référence, et ne seront donc pas décrits à nouveau.In Figure 2, which is a sectional view of a four-pole microwave bandpass filter, tunable and operating in evanescent mode, according to the invention, the elements identical to those of Figure 1 previously described have been designated by the same reference numbers, and will therefore not be described again.

Conformément à l'invention, le filtre de la figure 2 est équipé de dispositifs d'accès, respectivement d'entrée 21 et de sortie 22, extrêmement particuliers. Comme on le voit en effet sur la figure 2, et plus en détails sur la vue éclatée de la figure 3, chacun de ces accès est composé :

  • - d'une embase coaxiale 13, par exemple de type SMA,
  • - d'un tube isolant 14, par exemple en polytétrafluoréthylène, destiné au passage isolé de l'antenne à travers la paroi du guide 1, ce tube isolant 14 existant aussi dans la réalisation classique de la figure 1,
  • - d'une antenne de couplage 15 en forme de vilebrequin, dont le pliage est préférentiellement tel que l'antenne 15 se trouve, comme représenté, coincée dans le guide 1 ; l'antenne 15 présente une extrémité rétrécie 150 destinée à venir s'insérer étroitement dans l'embase coaxiale 13,
  • - d'un écrou 16 soudé sur l'autre extrémité de l'antenne 15, cette extrémité étant, comme représenté, extérieure au guide 1.
According to the invention, the filter of Figure 2 is equipped with access devices, respectively input 21 and outlet 22, extremely specific. As seen in fact in Figure 2, and in more detail in the exploded view of Figure 3, each of these accesses is composed :
  • a coaxial base 13, for example of the SMA type,
  • an insulating tube 14, for example made of polytetrafluoroethylene, intended for the isolated passage of the antenna through the wall of the guide 1, this insulating tube 14 also existing in the conventional embodiment of FIG. 1,
  • - A coupling antenna 15 in the form of a crankshaft, the folding of which is preferably such that the antenna 15 is, as shown, wedged in the guide 1; the antenna 15 has a narrowed end 150 intended to be inserted tightly in the coaxial base 13,
  • - a nut 16 welded to the other end of the antenna 15, this end being, as shown, external to the guide 1.

Le positionnement de l'accès 21 dans le guide 1 apparaît encore plus clairement sur la perspective de la figure 4, celle-ci faisant apparaître en outre une vis 17 de blocage en rotation de l'antenne 15 qui traverse le corps 1 jusqu'à venir s'appuyer sur ladite antenne 15.The positioning of the access 21 in the guide 1 appears even more clearly on the perspective of FIG. 4, the latter also showing a screw 17 for blocking the rotation of the antenna 15 which passes through the body 1 until come to rest on said antenna 15.

Le filtre qui vient d'être décrit bénéficie d'une possibilité de couplage entre les accès 21, 22 et les résonateurs adjacents 4, 7, à .réglage fin et continu.The filter which has just been described has the possibility of coupling between the ports 21, 22 and the adjacent resonators 4, 7, with fine and continuous adjustment.

Pour effectuer ce réglage, on débloque en rotation l'accès considéré, 21 par exemple, en desserrant la vis 17, puis on fait tourner, à l'aide de l'écrou 16, l'antenne en forme de vilebrequin 15, jusqu'à ce que l'on ait ainsi ajusté le couplage à la valeur désirée. On bloque ensuite à nouveau l'antenne 15 en serrant la vis 17.To make this adjustment, the access in question is released in rotation, 21 for example, by loosening the screw 17, then the crankshaft antenna 15 is rotated, using the nut 16, until that the coupling has thus been adjusted to the desired value. The antenna 15 is then again blocked by tightening the screw 17.

Pour les essais effectués par la demanderesse, l'antenne 15 a été réalisée en bronze-béryllium non recuit, avec une fine couche superficielle (quelques microns d'épaisseur) en or, assurant une bonne conductivité électrique. La forme en vilebrequin de l'antenne 15 a été réalisée par pliage dans un moule, ce qui assure une très bonne repro- ductivilité. Du fait de l'élasticité du bronze-béryllium non recuit, on a pu introduire à force l'antenne 15 dans le guide 1 par le trou où vient se loger le tube isolant 14.For the tests carried out by the applicant, the antenna 15 was made of non-annealed beryllium bronze, with a thin surface layer (a few microns thick) in gold, ensuring good electrical conductivity. The crankshaft shape of the antenna 15 was produced by folding in a mold, which ensures very good reproducibility. Due to the elasticity of the non-annealed beryllium bronze, it was possible to force the antenna 15 into the guide 1 through the hole where the insulating tube 14 is housed.

Claims (2)

1/ Filtre passe-bande hyperfréquences, accordable et fonctionnant en mode évanescent, du type comportant au moins un dispositif d'accès (21, 22) de type coaxial, caractérisé en ce que ledit dispositif d'accès est équipé d'une antenne de couplage (15) en forme de vilebrequin, et en ce qu'il est équipé de moyens (16, 150) permettant de régler le couplage entre ladite antenne et ledit filtre en faisant tourner ladite antenne autour de son axe longitudinal.1 / Microwave bandpass filter, tunable and operating in evanescent mode, of the type comprising at least one access device (21, 22) of coaxial type, characterized in that said access device is equipped with an antenna coupling (15) in the form of a crankshaft, and in that it is equipped with means (16, 150) for adjusting the coupling between said antenna and said filter by rotating said antenna about its longitudinal axis. 2/ Filtre passe-bande selon la revendication 1, caractérisé en ce que ladite antenne est dimensionnée de manière à être coincée, après sa mise en place, dans le corps du guide (1) dudit filtre.2 / Bandpass filter according to claim 1, characterized in that said antenna is dimensioned so as to be wedged, after its installation, in the body of the guide (1) of said filter.
EP86107876A 1985-06-13 1986-06-10 Evanescent-mode microwave band-pass filter Withdrawn EP0205151A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508966A FR2583597A1 (en) 1985-06-13 1985-06-13 HYPERFREQUENCY PASSPORT FILTER IN EVANESCENT MODE
FR8508966 1985-06-13

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EP0205151A1 true EP0205151A1 (en) 1986-12-17

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EP86107876A Withdrawn EP0205151A1 (en) 1985-06-13 1986-06-10 Evanescent-mode microwave band-pass filter

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US (1) US4746883A (en)
EP (1) EP0205151A1 (en)
JP (1) JPS62122303A (en)
FR (1) FR2583597A1 (en)
NO (1) NO169367C (en)

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EP0343585A1 (en) * 1988-05-27 1989-11-29 Alcatel Telspace Microwave multiplex filter
EP0375016A2 (en) * 1988-12-21 1990-06-27 Siemens Telecomunicazioni S.P.A. Microwave comb-line band-pass filters
WO1998005086A1 (en) * 1996-07-24 1998-02-05 Aft Advanced Ferrite Technology Gmbh Device for tuning a microwave system
CN104103884A (en) * 2014-07-14 2014-10-15 常州普纳电子科技有限公司 Adjustable sealed coupler
WO2016174422A3 (en) * 2015-04-28 2017-01-05 David Rhodes A tuneable tem mode microwave resonator and a tuneable microwave filter

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FR2655199B1 (en) * 1989-11-30 1992-10-02 Alcatel Transmission BAND ELIMINATOR FILTER FOR MICROWAVE WAVEGUIDE.
US5808528A (en) * 1996-09-05 1998-09-15 Digital Microwave Corporation Broad-band tunable waveguide filter using etched septum discontinuities
US5777534A (en) * 1996-11-27 1998-07-07 L-3 Communications Narda Microwave West Inductor ring for providing tuning and coupling in a microwave dielectric resonator filter
US5781085A (en) * 1996-11-27 1998-07-14 L-3 Communications Narda Microwave West Polarity reversal network
US5739734A (en) * 1997-01-13 1998-04-14 Victory Industrial Corporation Evanescent mode band reject filters and related methods
DE69834370T2 (en) * 1997-08-28 2007-03-15 The Boeing Co., Chicago Clutch mechanism for TE011 and TE01delta mode resonators
US5959512A (en) * 1997-09-19 1999-09-28 Raytheon Company Electronically tuned voltage controlled evanescent mode waveguide filter
JP3520472B2 (en) * 2000-02-07 2004-04-19 日本航空電子工業株式会社 Directional coupler with coupling degree adjustment function
SE516862C2 (en) * 2000-07-14 2002-03-12 Allgon Ab Reconciliation screw device and method and resonator
WO2004088786A1 (en) * 2003-03-31 2004-10-14 Eads Astrium Limited Lockable tuning screw
GB0610580D0 (en) * 2006-05-30 2006-07-05 Ceravision Ltd Lamp
CA2762703A1 (en) * 2011-05-17 2012-11-17 Apollo Microwaves, Ltd. A waveguide filter having coupling screws
EP2544296A1 (en) * 2011-07-06 2013-01-09 Alcatel Lucent Rotatable coupling structure for radio frequency signals
US9190701B2 (en) 2012-06-12 2015-11-17 Rs Microwave Company In-line pseudoelliptic TE01(nδ) mode dielectric resonator filters
US9287600B2 (en) * 2014-03-26 2016-03-15 Alcatel-Lucent Shanghai Bell Co., Ltd. Adjustable phase-inverting coupling loop
US10900919B2 (en) * 2017-02-13 2021-01-26 Skyworks Solutions, Inc. Microwave cavity for permittivity measurements

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0343585A1 (en) * 1988-05-27 1989-11-29 Alcatel Telspace Microwave multiplex filter
FR2632123A1 (en) * 1988-05-27 1989-12-01 Alcatel Thomson Faisceaux MULTIPLEX FILTER IN HYPERFREQUENCE, AND METHOD FOR ADJUSTING SUCH FILTER
US4980662A (en) * 1988-05-27 1990-12-25 Alcatel N.V. Multiplexed microwave filter, and method of adjusting such a filter
EP0375016A2 (en) * 1988-12-21 1990-06-27 Siemens Telecomunicazioni S.P.A. Microwave comb-line band-pass filters
EP0375016A3 (en) * 1988-12-21 1991-03-20 Siemens Telecomunicazioni S.P.A. Microwave comb-line band-pass filters
WO1998005086A1 (en) * 1996-07-24 1998-02-05 Aft Advanced Ferrite Technology Gmbh Device for tuning a microwave system
CN104103884A (en) * 2014-07-14 2014-10-15 常州普纳电子科技有限公司 Adjustable sealed coupler
CN104103884B (en) * 2014-07-14 2017-02-22 常州普纳电子科技有限公司 Adjustable sealed coupler
WO2016174422A3 (en) * 2015-04-28 2017-01-05 David Rhodes A tuneable tem mode microwave resonator and a tuneable microwave filter

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US4746883A (en) 1988-05-24
NO862330D0 (en) 1986-06-11
JPS62122303A (en) 1987-06-03
NO862330L (en) 1986-12-15
NO169367B (en) 1992-03-02
FR2583597A1 (en) 1986-12-19
NO169367C (en) 1992-06-10

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