EP1579526B1 - Mit metallisiertem synthetischen schaumstoff realisiertes hochfrequenz-koaxialfilter - Google Patents

Mit metallisiertem synthetischen schaumstoff realisiertes hochfrequenz-koaxialfilter 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
Authority
EP
European Patent Office
Prior art keywords
tube
bar
foam
filter
metallized
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.)
Expired - Fee Related
Application number
EP03810010A
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English (en)
French (fr)
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EP1579526A2 (de
Inventor
Dominique Lo Hine Tong
Ali Louzir
Philippe Chambelin
Christian Person
Jean-Philippe Coupez
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.)
THOMSON LICENSING
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Thomson Licensing SAS
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Publication date
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Publication of EP1579526A2 publication Critical patent/EP1579526A2/de
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Publication of EP1579526B1 publication Critical patent/EP1579526B1/de
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Classifications

    • 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.

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

Claims (4)

  1. Hochfrequenz-Koaxialfilter mit einem Rohr (1; 1'; 1') mit einem konstanten Innendurchmesser und einer vollmetallisierten Außenfläche mit einem in axialer Richtung gemäß einer periodischen oder konstanten Funktion verlaufenden Profil und mit einem Innenstab (2; 2'; 2') mit einem jeweils konstanten oder gemäß einer periodischen Funktion verlaufenden vollmetallisierten Außenprofil, dadurch gekennzeichnet, dass das Rohr und der Stab aus einem synthetischen Schaumstoff hergestellt sind, dessen elektrische Eigenschaften annähernd denjenigen der Luft entsprechen, wobei der größte Stabdurchmesser (3A-3D; 2'; 2") dem Innendurchmesser des Rohrs weitestgehend entspricht, um das Einführen des Stabs in das Rohr zu ermöglichen.
  2. Filter nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der periodischen Funktion um eine Slot-Funktion handelt, wobei die Slots von einem Slot zum anderen identische oder unterschiedliche Größen aufweisen.
  3. Verfahren zur Herstellung eines Filters nach einem der Ansprüche 1 bis 2, bei dem die periodische Funktion durch Thermoformung des Schaumstoffrohrs bzw. des Schaumstoffstabs realisiert wird.
  4. Herstellungsverfahren nach Anspruch 3, bei dem die Oberflächenmetallisierung des Schaumstoffrohrs bzw. des Schaumstoffstabs durch Spritzmetallisierung oder Pinselmetallisierung erfolgt.
EP03810010A 2003-01-03 2003-12-22 Mit metallisiertem synthetischen schaumstoff realisiertes hochfrequenz-koaxialfilter Expired - Fee Related EP1579526B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0300048A FR2849719A1 (fr) 2003-01-03 2003-01-03 Filtre hyperfrequences en structure coaxiale
FR0300048 2003-01-03
PCT/FR2003/050200 WO2004066429A2 (fr) 2003-01-03 2003-12-22 Filtre hyperfrequences en structure coaxiale realise en mousse de matiere synthetique metallisee

Publications (2)

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

Family

ID=32524681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03810010A Expired - Fee Related EP1579526B1 (de) 2003-01-03 2003-12-22 Mit metallisiertem synthetischen schaumstoff realisiertes hochfrequenz-koaxialfilter

Country Status (11)

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

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100928915B1 (ko) * 2005-03-26 2009-11-30 주식회사 케이엠더블유 저역통과필터
WO2008068825A1 (ja) * 2006-12-01 2008-06-12 Mitsubishi Electric Corporation 同軸線路スロットアレーアンテナとその製造方法
US8847701B2 (en) * 2008-10-31 2014-09-30 Ace Technologies Corporation Miniaturized DC breaker
CN101931113B (zh) * 2009-06-25 2013-01-23 泰科电子(上海)有限公司 低通滤波器
CN101630765B (zh) * 2009-08-25 2012-10-17 华为技术有限公司 同轴线低通滤波器及其幅频特性改善的方法
KR101016744B1 (ko) * 2010-06-15 2011-02-25 주식회사 이너트론 듀얼 구조 저역통과필터
DE102014214023A1 (de) * 2014-05-16 2015-11-19 Rohde & Schwarz Gmbh & Co. Kg Leitungssystem mit geschlossenzelligem Hartschaum
WO2019214816A1 (en) * 2018-05-08 2019-11-14 Telefonaktiebolaget Lm Ericsson (Publ) A waveguide section comprising waveguide tubes with plug-in filter devices
CN112599943B (zh) * 2020-11-16 2022-02-11 武汉凡谷电子技术股份有限公司 一种新型冲压卷制低通及其加工工艺
FR3116646B1 (fr) * 2020-11-26 2023-06-30 Thales Sa Câble de puissance à filtre intégré
CN115377710B (zh) * 2022-09-17 2024-01-05 杭州摩光通讯器材有限公司 一种具有短线路结构的平行堆叠型避雷器

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2641646A (en) * 1949-08-10 1953-06-09 Gen Electric Coaxial line filter structure
US2911333A (en) * 1954-11-24 1959-11-03 Itt Method for manufacturing a coaxial filter
GB1156931A (en) * 1965-08-26 1969-07-02 Us Government Improvements in Waveguide Components
US3464898A (en) * 1966-05-16 1969-09-02 Us Army Plastic foam mandrel for electroforming
US3659232A (en) * 1970-02-24 1972-04-25 Rca Corp Transmission line filter
US3909755A (en) * 1974-07-18 1975-09-30 Us Army Low pass microwave filter
US4161704A (en) * 1977-01-21 1979-07-17 Uniform Tubes, Inc. Coaxial cable and method of making the same
DE3207422A1 (de) * 1982-03-02 1983-09-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Koaxiales tiefpassfilter oder kontaktloser kurzschlussschieber
JPS5913401A (ja) * 1982-07-14 1984-01-24 Matsushita Electric Ind Co Ltd 同軸型低域通過「ろ」波器
US20030001697A1 (en) * 2001-06-20 2003-01-02 The Boeing Company Resonance suppressed stepped-impedance low pass filter and associated method of fabrication

Also Published As

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

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