EP2608312A1 - Élément de transmission électrique coaxial - Google Patents

Élément de transmission électrique coaxial Download PDF

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Publication number
EP2608312A1
EP2608312A1 EP12194260.1A EP12194260A EP2608312A1 EP 2608312 A1 EP2608312 A1 EP 2608312A1 EP 12194260 A EP12194260 A EP 12194260A EP 2608312 A1 EP2608312 A1 EP 2608312A1
Authority
EP
European Patent Office
Prior art keywords
insulating sleeve
transmission element
electrical transmission
coaxial electrical
element according
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.)
Granted
Application number
EP12194260.1A
Other languages
German (de)
English (en)
Other versions
EP2608312B1 (fr
Inventor
Wolfgang Beerwerth
Hartmut Schupsky
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.)
Telegaertner Karl Gaertner GmbH
Original Assignee
Telegaertner Karl Gaertner GmbH
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 Telegaertner Karl Gaertner GmbH filed Critical Telegaertner Karl Gaertner GmbH
Publication of EP2608312A1 publication Critical patent/EP2608312A1/fr
Application granted granted Critical
Publication of EP2608312B1 publication Critical patent/EP2608312B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/06—Coaxial lines

Definitions

  • the invention relates to a coaxial electrical transmission element comprising an inner conductor with frequency-dependent transmission behavior, an outer conductor surrounding the inner conductor in the circumferential direction, and an insulating sleeve which is arranged between the inner conductor and the outer conductor, wherein the insulating sleeve is made of an electrically non-conductive plastic material and an inner side facing the inner conductor and an outer conductor facing the outside.
  • Such coaxial electrical transmission elements are used for the transmission of electrical high-frequency signals whose frequency can be up to about 10 GHz, some 100 MHz.
  • the electrical transmission elements can form a passive high-frequency filter, for example a high-pass filter or a low-pass filter.
  • the inner conductor forms one or more concentrated capacitances by having at least one enlarged diameter lead portion followed by a reduced diameter lead portion.
  • the inner conductor forms a signal line, via which the electrical high-frequency signals are transmitted, and the outer conductor forms a ground line, which shields the inner conductor to the outside and protects against external interference.
  • an insulating sleeve is arranged, which is made of an electrically non-conductive plastic material and prevents a galvanic connection between the inner conductor and the outer conductor.
  • a coaxial electrical transmission element is for example from the EP 2 071 660 A1 known in the form of a high pass filter.
  • the insulating sleeve is usually made in known coaxial transmission elements of a plastic material, in particular of a polytetrafluoroethylene material, which is machined so that it has a smooth surface on its inside and on its outside. The smooth surface facilitates the assembly of the inner sleeve and the machining makes it possible to adapt the inner diameter and the outer diameter of the insulating sleeve to the dimensions of the inner conductor and the outer conductor.
  • Object of the present invention is to develop a coaxial electrical transmission element of the generic type such that it can be produced more cheaply.
  • the insulating sleeve is designed as an injection molded part, the inside and / or outside is structured.
  • the insulating sleeve is designed as an injection molded part, ie it is produced in an injection molding.
  • the manufacturing cost of the coaxial electrical transmission element can be considerably reduced.
  • a subsequent machining of the insulating is not required.
  • the production in an injection molding process restricts the selection of the possible plastic materials for the insulating sleeve.
  • the plastic materials suitable for an injection molding process differ in their dielectric constant from the polytetrafluoroethylene materials commonly used.
  • the insulating sleeve used in the coaxial electrical transmission element according to the invention has on its inner side and / or on its outer side a structured surface.
  • the insulating sleeve used according to the invention is thus not smooth on its inside and / or on its outside in departure from known insulating sleeves, but it has a macroscopically visible structure in the form of successive depressions in the axial direction and / or in the circumferential direction of the insulating sleeve surveys.
  • the electrical behavior of the coaxial electrical transmission element can be adapted with injection molded insulating sleeve to the electrical behavior of conventional coaxial electrical transmission elements made in the usual way from a polytetrafluoroethylene material insulating sleeve.
  • This has the advantage that the polytetrafluoroethylene material can be replaced by a common injection-moldable plastic material, without the dimensioning of the inner conductor and / or the outer conductor must be changed. It can thus be used in the coaxial electrical transmission element according to the invention known from the prior art inner conductor and outer conductor whose dimensioning does not need to be changed.
  • the use of the internally and / or externally structured insulating sleeve in the form of an injection-molded part makes it possible to significantly reduce the manufacturing costs of the coaxial electrical transmission element using known inner and outer conductors.
  • the inside of the insulating sleeve has a smooth surface and the outside of the insulating sleeve is structured.
  • the smooth inner side facilitates the insertion of the inner conductor in the insulating sleeve, wherein the inner conductor sections may rest directly on the inside of the insulating without the risk that the insulating sleeve hooked or jammed.
  • the outside of the insulating sleeve is in contrast to the inside with a structure provided with a variety of in axial direction and / or in the circumferential direction successive elevations and depressions.
  • the insulating sleeve comprises on its outer side and / or on its inner side a plurality of depressions, which extend in the radial direction only over a fraction of the wall thickness of the insulating sleeve.
  • the recesses consequently do not form openings in the insulating sleeve, so that no electrical discharge can form between the inner conductor and the outer conductor.
  • the insulating sleeve thus forms a closed insulator between the inner conductor and the outer conductor.
  • the depth of the recesses arranged, for example, on the outside of the insulating sleeve is favorably at most 75% of the wall thickness of the insulating sleeve.
  • the insulating sleeve on its outer side recesses which extend in the radial direction over a minimum of 20% and a maximum of 60% of the wall thickness of the insulating sleeve. It has been found that by providing such recesses for the coaxial transmission element, an electrical behavior can be achieved which, despite the use of the designed as an injection molded insulating sleeve is virtually identical to the electrical behavior of coaxial electrical transmission elements, the one of a polytetrafluoroethylene material have produced and machined insulating sleeve.
  • the insulating sleeve is made of a polystyrene material or of a polymer blend.
  • plastic materials can be processed in a simple manner by conventional injection molding, whereby they obtain their structured surface by the injection molding, without a machining post-processing is required.
  • the insulating sleeve forms on its outside a pattern that repeats at a distance of at least 0.1 mm and a maximum of 1.5 mm.
  • the distance is in this case based on the middle of each other directly adjacent pattern.
  • the outside of the insulating sleeve on a plurality of over the circumference of the insulating sleeve extending annular grooves is preferably configured identically.
  • the annular grooves are U-shaped. It is advantageous if the flanks of the annular grooves are aligned obliquely to each other, so that widen the annular grooves in the radial direction to the outside. This facilitates demolding of the insulating sleeve during injection molding.
  • the axial distance of mutually immediately adjacent annular grooves is conveniently at most three times the depth of the annular grooves.
  • the distance between two directly adjacent annular grooves from center to center is understood as the axial distance.
  • the depth of the annular grooves is in a preferred embodiment of the invention 20% to 50% of the wall thickness of the insulating sleeve.
  • a groove extends helically along the outside of the insulating sleeve.
  • the axial distance between two immediately adjacent helices of the groove is preferably at most three times the groove depth.
  • the axial distance here is the distance between two immediately adjacent slot helices from center to center.
  • the insulating sleeve has longitudinal grooves extending in the axial direction.
  • the longitudinal grooves are preferably arranged on the outside of the insulating sleeve.
  • the longitudinal grooves extend favorably over the entire length of the insulating sleeve.
  • a plurality of longitudinal grooves are arranged uniformly distributed over the circumference of the insulating sleeve.
  • all longitudinal grooves are configured identically.
  • FIG. 1 schematically a longitudinal section of a coaxial electrical transmission element according to the invention is shown, which is generally occupied by the reference numeral 10 and an inner conductor 12 and an outer conductor 14 has.
  • the transmission element 10 comprises a arranged between the inner conductor 12 and the outer conductor 14 insulating sleeve 16.
  • the inner conductor 12 forms a signal line, via which an electrical high-frequency signal in the gigahertz range can be transmitted.
  • the outer conductor 14 surrounds the inner conductor 12 in the circumferential direction and forms a ground line, which shields the inner conductor 12.
  • the connecting elements may be formed, for example in the form of connectors.
  • the coaxial electrical transmission element 10 has a frequency-dependent transmission behavior.
  • the coaxial electrical transmission element 10 is formed as a coaxial high-pass filter having a very high attenuation in a first frequency range with a relatively low frequency and a low attenuation in a second frequency range with a relatively high frequency following the first frequency range.
  • electrical signals of the first frequency range can be virtually hidden, whereas electrical signals of the second frequency range can be transmitted via the coaxial electrical transmission element 10 with very low attenuation.
  • the transmission behavior of the coaxial electrical transmission element 10 is determined inter alia by the geometric configuration of the inner conductor 12. This has first line sections 18 with a relatively small diameter, to each of which a second line section 20 connects with a relatively large diameter. The transition area between a first line section 18 and a second line section 20 is in FIG. 2 shown enlarged.
  • the insulating sleeve 16 has a smooth inner surface 22, which faces the inner conductor 12 and on which the inner conductor 12 with its second line sections 20 rests directly.
  • the outer conductor 14 facing outside 24 of the insulating sleeve 16 is structured.
  • the outer side 24 carries a plurality of each extending over the entire circumference of the insulating sleeve 16 annular grooves 26 whose groove depth T is about one third of the wall thickness W of the insulating sleeve 16. In the illustrated embodiment, the groove depth T is about 0.3 mm and the wall thickness W is about 1 mm.
  • the respective U-shaped annular grooves 26 form on the outer side 24 of the insulating sleeve 16 a pattern that is repeated in constant intervals A in the axial direction.
  • the distance A in the illustrated embodiment is twice the groove depth, namely 0.6 mm.
  • the insulating sleeve 16 is made of a polystyrene material by injection molding, d. H. the annular grooves 26 were formed in the outside 24 during the casting process, without requiring any additional machining of the insulating sleeve 16.
  • a polystyrene material a polymer blend for injection molding of the insulating sleeve 16 could also be used.
  • the inner conductor 12 forms a concentrated capacitance in combination with the outer conductor 14 and the insulating sleeve 16 arranged therebetween.
  • the insulating sleeve 16 arranged between the second line section 20 and the outer conductor 14, in combination with the air located in the annular grooves 26, acts as a dielectric, which substantially co-determines the electrical behavior of the concentrated capacitor. The electrical behavior is dependent on the dielectric constant of the plastic material of the insulating sleeve 16 and the Dielectric constant of the air, which is located in the annular grooves 26.
  • an electrical behavior of concentrated capacity can be achieved, which is virtually identical to the electrical behavior, which with a made of a polytetrafluoroethylene insulating sleeve with smoother Inside and outside can be achieved.
  • the externally structured insulating sleeve 16 is used, which was produced by injection molding and subsequently machined without the dimensions of the inner conductor 12 or the outer conductor 14 changed has been.
  • the adaptation of the electrical behavior of the insulating sleeve 16 to an insulating sleeve made of a polytetrafluoroethylene material is effected by the choice of the structure of the outer side 24.
  • the choice of structure, in particular their dimensioning, is carried out depending on the particular application of the insulating sleeve 16th
  • the coaxial electrical transmission element 10 is therefore characterized by a cost-effective production, wherein usual, unchanged in their dimensions inner and outer conductors 12, 14 are used in combination with an injection-molded and provided during injection molding on the outside with a structure insulating sleeve 16th

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  • Communication Cables (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP12194260.1A 2011-12-20 2012-11-26 Élément de transmission électrique coaxial Not-in-force EP2608312B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110056710 DE102011056710A1 (de) 2011-12-20 2011-12-20 Koaxiales elektrisches Übertragungselement

Publications (2)

Publication Number Publication Date
EP2608312A1 true EP2608312A1 (fr) 2013-06-26
EP2608312B1 EP2608312B1 (fr) 2017-04-26

Family

ID=47216154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12194260.1A Not-in-force EP2608312B1 (fr) 2011-12-20 2012-11-26 Élément de transmission électrique coaxial

Country Status (3)

Country Link
EP (1) EP2608312B1 (fr)
CN (1) CN103178318B (fr)
DE (1) DE102011056710A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105070977B (zh) * 2015-07-28 2017-11-07 西安空间无线电技术研究所 一种提高同轴型传输线微放电阈值的结构
CN105931770B (zh) * 2016-04-28 2017-05-17 武汉纺织大学 一种低通绝缘套筒及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
DE842806C (de) * 1946-10-21 1952-06-30 Lignes Telegraph Telephon Vorrichtung zur Aufbringung von Isolierteilen, z. B. Isolierscheiben, auf elektrische Leiter
DE2421173A1 (de) * 1974-05-02 1975-11-20 Kabel Metallwerke Ghh Koaxiales hochfrequenzkabel
US4641110A (en) * 1984-06-13 1987-02-03 Adams-Russell Company, Inc. Shielded radio frequency transmission cable having propagation constant enhancing means
EP1171928A1 (fr) * 1999-04-16 2002-01-16 Telefonaktiebolaget LM Ericsson (publ) Filtre
EP2071660A1 (fr) 2007-12-11 2009-06-17 Telegärtner Karl Gärtner Gmbh Filtre passe-haut

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006033704B3 (de) * 2006-07-20 2008-01-03 Kathrein-Werke Kg Hochfrequenzfilter in koaxialer Bauweise, insbesondere nach Art einer Hochfrequenzweiche (z.B. einer Duplex-Weiche) oder eines Bandpassfilters oder Bandsperrfilters
DE202008004431U1 (de) * 2008-03-31 2008-05-29 Gustav Hensel Gmbh & Co. Kg Stromschienenverbinder
CN101931113B (zh) * 2009-06-25 2013-01-23 泰科电子(上海)有限公司 低通滤波器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
DE842806C (de) * 1946-10-21 1952-06-30 Lignes Telegraph Telephon Vorrichtung zur Aufbringung von Isolierteilen, z. B. Isolierscheiben, auf elektrische Leiter
DE2421173A1 (de) * 1974-05-02 1975-11-20 Kabel Metallwerke Ghh Koaxiales hochfrequenzkabel
US4641110A (en) * 1984-06-13 1987-02-03 Adams-Russell Company, Inc. Shielded radio frequency transmission cable having propagation constant enhancing means
EP1171928A1 (fr) * 1999-04-16 2002-01-16 Telefonaktiebolaget LM Ericsson (publ) Filtre
EP2071660A1 (fr) 2007-12-11 2009-06-17 Telegärtner Karl Gärtner Gmbh Filtre passe-haut

Also Published As

Publication number Publication date
EP2608312B1 (fr) 2017-04-26
DE102011056710A1 (de) 2013-06-20
CN103178318A (zh) 2013-06-26
CN103178318B (zh) 2017-04-12

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