EP1579526B1 - Microwave filter comprising a coaxial structure, which is made from metallised synthetic foam - Google Patents

Microwave filter comprising a coaxial structure, which is made from metallised synthetic foam Download PDF

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Publication number
EP1579526B1
EP1579526B1 EP03810010A EP03810010A EP1579526B1 EP 1579526 B1 EP1579526 B1 EP 1579526B1 EP 03810010 A EP03810010 A EP 03810010A EP 03810010 A EP03810010 A EP 03810010A EP 1579526 B1 EP1579526 B1 EP 1579526B1
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EP
European Patent Office
Prior art keywords
tube
bar
foam
filter
metallized
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Expired - Fee Related
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EP03810010A
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German (de)
French (fr)
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EP1579526A2 (en
Inventor
Dominique Lo Hine Tong
Ali Louzir
Philippe Chambelin
Christian Person
Jean-Philippe Coupez
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THOMSON LICENSING
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Thomson Licensing SAS
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Publication of EP1579526A2 publication Critical patent/EP1579526A2/en
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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
    • H01P1/202—Coaxial filters

Definitions

  • the invention relates to a microwave filter in coaxial structure comprising a conductive outer core and a conductive inner core extending in an axial direction inside the outer core and forming therewith a succession of concentric slots in the direction axial defining successive sections of coaxial line of low characteristic impedance and coaxial line of high characteristic impedance.
  • the section of the inner core therefore varies in the axial direction so that each section of the inner core of large diameter (corresponding to a metal disk) defines a coaxial line section of very low impedance and each section of the core.
  • inner diameter of smaller diameter defines a coaxial line section of high impedance.
  • the dimensions of the sections are adjusted to perform the transfer function of the filter.
  • the realization of such a microwave filter in coaxial structure is however complex and expensive to achieve in particular to maintain perfect coaxiality between the inner core and the outer core of the filter. Spacers made of plastic or other dielectric material are generally used to maintain coaxiality but this introduces dielectric losses.
  • Another type of coaxial filter is also proposed in Japanese Patent Application No. 59013401 .
  • the invention proposes a microwave filter in coaxial structure of simpler and less expensive construction adapted to volume production and low cost.
  • the invention relates to a microwave filter in coaxial structure constituted by a plastic foam tube, the tube having a constant internal diameter and a fully metallized outer surface with, in the axial direction, a profile according to a periodic function. , or constant and by an inner bar made of fully metallized synthetic foam, with a constant external profile or a periodic function, the largest diameter of the bar being substantially equal to the internal diameter of the tube so that the bar can be inserted into the tube while maintaining the coaxiality between the tube and the bar.
  • the foam used is preferably a polymethacryl imide foam known for its electrical characteristics close to those of air, for its mechanical characteristics of rigidity and lightness and for its low cost price. In particular, it will be possible to use a polymethacrylate imide foam marketed under the name "ROHACELL HF".
  • a microwave filter can easily be associated with a monopole or dipole type antenna.
  • the invention extends to a method of manufacturing a microwave filter as defined above according to which the periodic function is carried out by thermoforming the foam tube or the foam bar.
  • thermoforming it will be preferable to use hot-pressing molding which is adapted to a production objective in volume and at low cost.
  • the metallization of the foam tube or the foam bar is preferably non-directive metallization by projection or with a brush.
  • FIG. figure 1 A first example of a microwave filter in coaxial structure according to the invention is shown in FIG. figure 1 according to an exploded perspective view.
  • the outer conductive tube 1 and the inner conducting bar 2 of the filter are shown on the figure 1 dissociated from each other for clarity but it should be understood that the inner bar 2 extends in the axial direction A inside the outer tube 1.
  • the inner bar 2 of the filter is constituted by a cylindrical bar of plastic foam whose outer surface follows in the axial direction, a periodic function. It preferably forms a succession of concentric slots 3A to 3D carrying out the transfer function of the filter, for example a transfer function of a low-pass filter by defining successive sections of coaxial line of low characteristic impedance and of line coaxial high characteristic impedance.
  • the conformation of the foam bar 2 is carried out by thermoforming, in particular according to a hot pressing molding technique.
  • the outer surface of the foam bar 2 is metallized preferably by spraying or brushing.
  • the outer tube 1 of the filter is constituted by a cylindrical tube of plastic foam having a constant inner section, the internal diameter of the tube being very slightly greater than the largest outer diameter of the foam bar 2 to allow the insertion of the bar into the tube.
  • the cylindrical tube 1 has a fully metallized outer surface according to the metallization technique indicated above. The thickness of the tube 1 is chosen to provide electrical insulation between its metallized outer surface and the bar.
  • the foam of synthetic material used is preferably a polymethacrylate imide foam.
  • the structure of the filter shown on the figure 1 can be reinforced by two half-shells (not shown) surrounding the tube 1 which can be made of a plastic material or foam of synthetic material.
  • tube 1 and the bar 2 foam may have a section other than circular, for example rectangular or square without departing from the scope of the invention.
  • the figure 2 shows another embodiment of a filter according to the invention.
  • the outer tube 1 'of the filter is constituted by a cylindrical tube of plastic foam whose metallized outer surface is shaped to define the succession of crenellations 3A'-3B' in the axial direction A while the inner bar 2 'of the filter is constituted by a cylindrical conductive bar of constant section. Therefore, the outer surface of the tube has, in the axial direction, a profile according to a periodic or piecewise constant function such as a crenellated function.
  • the conducting bar 2 ' may consist of a solid or hollow metal cylindrical tube.
  • the bar 2 ' can also be made of foam of metallized synthetic material.
  • the microwave filter according to the invention is associated with a monopole type antenna 4 constituted by an extension of the inner core 2 'of the filter.
  • the figure 3 shows a microwave filter according to the invention which is similar to that shown in FIG. figure 1 with an outer tube consisting of a foam tube 1 "of constant section and an inner bar constituted by a foam bar 2" of variable section in the axial direction A.
  • the filter is associated here with a dipole antenna 5.

Description

L'invention concerne un filtre hyperfréquences en structure coaxiale comprenant une âme extérieure conductrice et une âme intérieure conductrice s'étendant selon une direction axiale à l'intérieure de l'âme extérieure et formant avec celle-ci une succession de créneaux concentriques selon la direction axiale définissant des tronçons successifs de ligne coaxiale de faible impédance caractéristique et de ligne coaxiale de haute impédance caractéristique.The invention relates to a microwave filter in coaxial structure comprising a conductive outer core and a conductive inner core extending in an axial direction inside the outer core and forming therewith a succession of concentric slots in the direction axial defining successive sections of coaxial line of low characteristic impedance and coaxial line of high characteristic impedance.

L'ouvrage « Microwave Filters, Impedance-Matching Networks and Coupling Structures », MgrawHill, 1962 , présente un tel filtre hyperfréquences, en particulier un filtre passe-bas, dans lequel l'âme extérieure conductrice est constituée classiquement par un tube cylindrique métallique et l'âme intérieure conductrice est constituée par une tige métallique portant des disques métalliques concentriques espacés selon la direction axiale, les disques métalliques formant la succession de créneaux concentriques. La section de l'âme intérieure varie donc selon la direction axiale de sorte que chaque tronçon de l'âme intérieure de grand diamètre (correspondant à un disque métallique) définit un tronçon de ligne coaxiale de très faible impédance et chaque tronçon de l'âme intérieure de plus faible diamètre (correspondant à l'intervalle entre deux disques consécutifs) définit un tronçon de ligne coaxiale de haute impédance. Les dimensions des tronçons sont ajustées de manière à réaliser la fonction de transfert du filtre. La réalisation d'un tel filtre hyperfréquences en structure coaxiale s'avère toutefois complexe et coûteuse à réaliser notamment pour maintenir une parfaite coaxialité entre l'âme intérieure et l'âme extérieure du filtre. Des entretoises en plastique ou autre matériau diélectrique sont généralement utilisées pour maintenir la coaxialité mais cela introduit des pertes diélectriques. Un autre type de filtre coaxial est aussi proposé dans la demande de brevet japonaise n° 59013401 .The book "Microwave Filters, Impedance-Matching Networks and Coupling Structures", MgrawHill, 1962 , has such a microwave filter, in particular a low-pass filter, wherein the conductive outer core is conventionally constituted by a metallic cylindrical tube and the conductive inner core is constituted by a metal rod carrying concentric metal disks spaced according to the axial direction, the metallic disks forming the succession of concentric crenellations. The section of the inner core therefore varies in the axial direction so that each section of the inner core of large diameter (corresponding to a metal disk) defines a coaxial line section of very low impedance and each section of the core. inner diameter of smaller diameter (corresponding to the interval between two consecutive disks) defines a coaxial line section of high impedance. The dimensions of the sections are adjusted to perform the transfer function of the filter. The realization of such a microwave filter in coaxial structure is however complex and expensive to achieve in particular to maintain perfect coaxiality between the inner core and the outer core of the filter. Spacers made of plastic or other dielectric material are generally used to maintain coaxiality but this introduces dielectric losses. Another type of coaxial filter is also proposed in Japanese Patent Application No. 59013401 .

L'invention propose un filtre hyperfréquences en structure coaxiale de construction plus simple et moins coûteuse adapté à une production en volume et à bas coût.The invention proposes a microwave filter in coaxial structure of simpler and less expensive construction adapted to volume production and low cost.

A cet effet, l'invention concerne un filtre hyperfréquences en structure coaxiale constitué par un tube en mousse de matière synthétique, le tube présentant un diamètre interne constant et une surface externe entièrement métallisée avec, dans la direction axiale, un profil selon une fonction périodique, ou constante et par un barreau intérieur en mousse de matière synthétique entièrement métallisé, avec un profil externe constant ou suivant une fonction périodique, le plus grand diamètre du barreau étant sensiblement égal au diamètre interne du tube pour que le barreau puisse s'enfoncer dans le tube tout en maintenant la coaxialité entre le tube et le barreau. La mousse utilisée est de préférence une mousse d'imide de polymétacrylate connue pour ses caractéristiques électriques proches de celles de l'air, pour ses caractéristiques mécaniques de rigidité et de légèreté et pour son faible coût de revient. En particulier, on pourra utiliser une mousse d'imide de polymethacrylate commercialisée sous le nom de "ROHACELL HF".To this end, the invention relates to a microwave filter in coaxial structure constituted by a plastic foam tube, the tube having a constant internal diameter and a fully metallized outer surface with, in the axial direction, a profile according to a periodic function. , or constant and by an inner bar made of fully metallized synthetic foam, with a constant external profile or a periodic function, the largest diameter of the bar being substantially equal to the internal diameter of the tube so that the bar can be inserted into the tube while maintaining the coaxiality between the tube and the bar. The foam used is preferably a polymethacryl imide foam known for its electrical characteristics close to those of air, for its mechanical characteristics of rigidity and lightness and for its low cost price. In particular, it will be possible to use a polymethacrylate imide foam marketed under the name "ROHACELL HF".

Selon des particularités d'un filtre selon l'invention :

  • La fonction périodique, ou constante par morceaux est une fonction en créneaux, les créneaux pouvant présenter des dimmensions différentes d'un créneau à l'autre.
  • L'épaisseur du tube est choisie pour maintenir une isolation électrique entre la surface métallisée du tube et le barreau.
According to features of a filter according to the invention:
  • The periodic function, or piecewise constant, is a nested function, the slots being able to have different dimensions from one slot to another.
  • The thickness of the tube is chosen to maintain electrical insulation between the metallized surface of the tube and the bar.

Avec cette construction, un filtre hyperfréquences peut facilement être associé à une antenne de type monopole ou de type dipole.With this construction, a microwave filter can easily be associated with a monopole or dipole type antenna.

L'invention s'étend à un procédé de fabrication d'un filtre hyperfréquences tel que défini ci-dessus selon lequel la fonction périodique est réalisée par thermoformage du tube de mousse ou du barreau de mousse. En particulier, comme technique de thermoformage, on utilisera de préférence un moulage par pressage à chaud qui est adapté à un objectif de production en volume et à bas coût.The invention extends to a method of manufacturing a microwave filter as defined above according to which the periodic function is carried out by thermoforming the foam tube or the foam bar. In particular, as a thermoforming technique, it will be preferable to use hot-pressing molding which is adapted to a production objective in volume and at low cost.

La métallisation du tube de mousse ou du barreau de mousse est de préférence une métallisation non directive par projection ou au pinceau.The metallization of the foam tube or the foam bar is preferably non-directive metallization by projection or with a brush.

Des exemples de réalisation d'un filtre selon l'invention sont décrits ci-après et illustrés sur les dessins.

  • La figure 1 illustre de façon très schématique en perpective éclatée un premier mode de réalisation d'un filtre hyperfréquences en structure coaxiale selon l'invention.
  • La figure 2 illustre de façon schématique en coupe axiale un second mode de réalisation d'un filtre hyperfréquences en structure coaxiale selon l'invention associé à une antenne de type monopole.
  • La figure 3 illustre de façon schématique, en coupe axiale, un filtre selon le premier mode de réalisation associé à une antenne de type dipole.
Embodiments of a filter according to the invention are described below and illustrated in the drawings.
  • The figure 1 illustrates very schematically in exploded perspective a first embodiment of a microwave filter in coaxial structure according to the invention.
  • The figure 2 schematically illustrates in axial section a second embodiment of a microwave filter coaxial structure according to the invention associated with a monopole type antenna.
  • The figure 3 schematically illustrates, in axial section, a filter according to the first embodiment associated with a dipole type antenna.

Un premier exemple de filtre hyperfréquences en structure coaxiale selon l'invention est montré sur la figure 1 selon une vue en perspective éclatée.A first example of a microwave filter in coaxial structure according to the invention is shown in FIG. figure 1 according to an exploded perspective view.

Le tube extérieur conducteur 1 et le barreau intérieur conducteur 2 du filtre sont montrés sur la figure 1 dissociés l'une de l'autre pour plus de clarté mais il faut comprendre que le barreau intérieur 2 s'étend selon la direction axiale A à l'intérieur du tube extérieur 1.The outer conductive tube 1 and the inner conducting bar 2 of the filter are shown on the figure 1 dissociated from each other for clarity but it should be understood that the inner bar 2 extends in the axial direction A inside the outer tube 1.

Le barreau intérieur 2 du filtre est constitué par un barreau cylindrique en mousse de matière synthétique dont la surface extérieure suit selon la direction axiale, une fonction périodique . Elle forme, de préférence, une succession de créneaux concentriques 3A à 3D réalisant la fonction de transfert du filtre, par exemple une fonction de transfert d'un filtre passe-bas en définissant des tronçons successifs de ligne coaxiale de faible impédance caractéristique et de ligne coaxiale de haute impédance caractéristique. La conformation du barreau de mousse 2 est réalisée par thermoformage, en particulier selon une technique de moulage par pressage à chaud. La surface extérieure du barreau de mousse 2 est métallisée de préférence par projection ou au pinceau.The inner bar 2 of the filter is constituted by a cylindrical bar of plastic foam whose outer surface follows in the axial direction, a periodic function. It preferably forms a succession of concentric slots 3A to 3D carrying out the transfer function of the filter, for example a transfer function of a low-pass filter by defining successive sections of coaxial line of low characteristic impedance and of line coaxial high characteristic impedance. The conformation of the foam bar 2 is carried out by thermoforming, in particular according to a hot pressing molding technique. The outer surface of the foam bar 2 is metallized preferably by spraying or brushing.

le tube extérieur 1 du filtre est constitué par un tube cylindrique en mousse de matière synthétique ayant une section intérieure constante, le diamètre intérieur du tube étant très légèrement supérieur au plus grand diamètre extérieur du barreau de mousse 2 pour permettre l'insertion du barreau dans le tube. Le tube cylindrique 1 a une surface extérieure entièrement métallisée selon la technique de métallisation indiquée plus haut. L'épaisseur du tube 1 est choisie pour réaliser une isolation électrique entre sa surface extérieure métallisée et le barreau.the outer tube 1 of the filter is constituted by a cylindrical tube of plastic foam having a constant inner section, the internal diameter of the tube being very slightly greater than the largest outer diameter of the foam bar 2 to allow the insertion of the bar into the tube. The cylindrical tube 1 has a fully metallized outer surface according to the metallization technique indicated above. The thickness of the tube 1 is chosen to provide electrical insulation between its metallized outer surface and the bar.

La mousse de matière synthétique utilisée est de préférence une mousse d'imide de polymétacrylate.The foam of synthetic material used is preferably a polymethacrylate imide foam.

La structure du filtre montrée sur la figure 1 peut être renforcée par deux demi-coques (non représentées) entourant le tube 1 qui peuvent être réalisées en une matière plastique ou en mousse de matière synthétique.The structure of the filter shown on the figure 1 can be reinforced by two half-shells (not shown) surrounding the tube 1 which can be made of a plastic material or foam of synthetic material.

Bien entendu, le tube 1 et le barreau 2 en mousse pourraient avoir une section autre que circulaire, par exemple rectangulaire ou carrée sans sortir du cadre de l'invention.Of course, the tube 1 and the bar 2 foam may have a section other than circular, for example rectangular or square without departing from the scope of the invention.

La figure 2 montre un autre mode de réalisation d'un filtre selon l'invention. Le tube extérieur 1' du filtre est constitué par un tube cylindrique en mousse de matière synthétique dont la surface extérieure métallisée est conformée pour définir la succession de créneaux 3A'-3B' selon la direction axiale A tandis que le barreau intérieur 2' du filtre est constitué par un barreau conducteur cylindrique de section constante. De ce fait, la surface externe du tube présente, selon la direction axiale, un profil suivant une fonction périodique ou constante par morceaux telle qu'une fonction en créneaux. Le barreau conducteur 2' peut consister en un tube cylindrique metallique plein ou creux. Le barreau 2' peut aussi être constitué de mousse en matériau synthétique métallisé. Sur la figure 2, le filtre hyperfréquences selon l'invention est associé à une antenne de type monopole 4 constituée par un prolongement de l'âme intérieure 2' du filtre.The figure 2 shows another embodiment of a filter according to the invention. The outer tube 1 'of the filter is constituted by a cylindrical tube of plastic foam whose metallized outer surface is shaped to define the succession of crenellations 3A'-3B' in the axial direction A while the inner bar 2 'of the filter is constituted by a cylindrical conductive bar of constant section. Therefore, the outer surface of the tube has, in the axial direction, a profile according to a periodic or piecewise constant function such as a crenellated function. The conducting bar 2 'may consist of a solid or hollow metal cylindrical tube. The bar 2 'can also be made of foam of metallized synthetic material. On the figure 2 , the microwave filter according to the invention is associated with a monopole type antenna 4 constituted by an extension of the inner core 2 'of the filter.

La figure 3 montre un filtre hyperfréquences selon l'invention qui est analogue à celui montré sur la figure 1 avec un tube extérieur constitué par un tube en mousse 1" de section constante et un barreau intérieur constitué par un barreau en mousse 2" de section variable selon la direction axiale A. Le filtre est associé ici à une antenne de type dipole 5.The figure 3 shows a microwave filter according to the invention which is similar to that shown in FIG. figure 1 with an outer tube consisting of a foam tube 1 "of constant section and an inner bar constituted by a foam bar 2" of variable section in the axial direction A. The filter is associated here with a dipole antenna 5.

L'utilisation de la technique mousse métallisée permet de réaliser à bas coût des filtres hyperfréquences de structure coaxiale complexe.The use of the metallized foam technique makes it possible to produce low-cost microwave filters of complex coaxial structure.

Claims (4)

  1. A coaxial structure microwave filter comprising a tube (1,1',1") presenting a constant inner diameter and a fully metallized outer surface with, in the axial direction, a profile according to a periodic or constant function and an inner bar (2,2',2") with respectively a constant outer profile or following a periodic function, all-metallized, characterized in that the tube and bar are made of synthetic foam, the electrical characteristics of which are similar to these of the air, the largest diameter of the bar (3A-3D; 2', 2") being noticeably equal to the inner diameter of the tube so that the bar be inserted in the tube.
  2. The filter according to claim 1, characterized in that the periodic function is a crenelation function, the crenelations having dimensions identical to or different from one crenelation to another.
  3. Process for manufacturing a filter according to a one of claims 1 to 2, in which the periodic function is realized by thermoforming the foam tube or foam bar.
  4. Process of manufacturing according to claim 3, in which the foam tube or foam bar is metallized at the surface by projection or by brush.
EP03810010A 2003-01-03 2003-12-22 Microwave filter comprising a coaxial structure, which is made from metallised synthetic foam Expired - Fee Related EP1579526B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0300048 2003-01-03
FR0300048A FR2849719A1 (en) 2003-01-03 2003-01-03 Hyper frequency low pass filter has coaxial structure with inner and outer conductive armatures carrying series of concentric plates
PCT/FR2003/050200 WO2004066429A2 (en) 2003-01-03 2003-12-22 Microwave filter comprising a coaxial structure, which is made from metallised synthetic foam

Publications (2)

Publication Number Publication Date
EP1579526A2 EP1579526A2 (en) 2005-09-28
EP1579526B1 true EP1579526B1 (en) 2009-03-18

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EP03810010A Expired - Fee Related EP1579526B1 (en) 2003-01-03 2003-12-22 Microwave filter comprising a coaxial structure, which is made from metallised synthetic foam

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US (1) US7355495B2 (en)
EP (1) EP1579526B1 (en)
JP (1) JP4304159B2 (en)
KR (1) KR20050088228A (en)
CN (1) CN100583550C (en)
AU (1) AU2003302195A1 (en)
BR (1) BR0317649A (en)
DE (1) DE60326763D1 (en)
FR (1) FR2849719A1 (en)
MX (1) MXPA05007105A (en)
WO (1) WO2004066429A2 (en)

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WO2008068825A1 (en) * 2006-12-01 2008-06-12 Mitsubishi Electric Corporation Coaxial line slot array antenna and its manufacturing method
CN102204033B (en) * 2008-10-31 2014-10-29 Ace技术株式会社 Miniaturized DC breaker
CN101931113B (en) * 2009-06-25 2013-01-23 泰科电子(上海)有限公司 Low-pass filter
CN101630765B (en) * 2009-08-25 2012-10-17 华为技术有限公司 Coaxial low-pass filter and amplitude-frequency characteristic improving method
KR101016744B1 (en) * 2010-06-15 2011-02-25 주식회사 이너트론 Dual type low pass filter
DE102014214023A1 (en) * 2014-05-16 2015-11-19 Rohde & Schwarz Gmbh & Co. Kg Conduit system with closed-cell rigid foam
EP3791439B1 (en) * 2018-05-08 2023-11-29 Telefonaktiebolaget LM Ericsson (publ) A waveguide section comprising waveguide tubes with plug-in filter devices
CN112599943B (en) * 2020-11-16 2022-02-11 武汉凡谷电子技术股份有限公司 Novel stamping and rolling low pass and processing technology thereof
FR3116646B1 (en) * 2020-11-26 2023-06-30 Thales Sa Power cable with integrated filter
CN115377710B (en) * 2022-09-17 2024-01-05 杭州摩光通讯器材有限公司 Parallel stacked lightning arrester with short circuit structure

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EP1579526A2 (en) 2005-09-28
JP2006513654A (en) 2006-04-20
WO2004066429A3 (en) 2004-09-10
US7355495B2 (en) 2008-04-08
US20060082426A1 (en) 2006-04-20
KR20050088228A (en) 2005-09-02
BR0317649A (en) 2005-12-06
FR2849719A1 (en) 2004-07-09
AU2003302195A1 (en) 2004-08-13
WO2004066429A2 (en) 2004-08-05
DE60326763D1 (en) 2009-04-30
MXPA05007105A (en) 2005-08-26
JP4304159B2 (en) 2009-07-29
CN1732593A (en) 2006-02-08
AU2003302195A8 (en) 2004-08-13
CN100583550C (en) 2010-01-20

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