EP0004654A1 - Hohlleiterdilatationsverbindung - Google Patents

Hohlleiterdilatationsverbindung Download PDF

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Publication number
EP0004654A1
EP0004654A1 EP79100993A EP79100993A EP0004654A1 EP 0004654 A1 EP0004654 A1 EP 0004654A1 EP 79100993 A EP79100993 A EP 79100993A EP 79100993 A EP79100993 A EP 79100993A EP 0004654 A1 EP0004654 A1 EP 0004654A1
Authority
EP
European Patent Office
Prior art keywords
expansion joint
trap
waveguide
elements
joint 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
EP79100993A
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English (en)
French (fr)
Other versions
EP0004654B1 (de
Inventor
Michel Sirel
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.)
Cables de Lyon SA
Original Assignee
Cables de Lyon 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 Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0004654A1 publication Critical patent/EP0004654A1/de
Application granted granted Critical
Publication of EP0004654B1 publication Critical patent/EP0004654B1/de
Expired legal-status Critical Current

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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
    • H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/06—Movable joints, e.g. rotating joints
    • H01P1/061—Movable joints, e.g. rotating joints the relative movement being a translation along an axis common to at least two rectilinear parts, e.g. expansion joints

Definitions

  • the invention relates to expansion joints for waveguides and in particular waveguides for television transmitting stations.
  • the waveguides When the waveguides are very long and are arranged in an environment where the differences in temperature are significant, such as natural variations in temperature, expansion stresses occur on these waveguides. This is particularly the case for television transmitting stations, where the waveguides are made of aluminum and are placed along a steel structure, a pylon for example, and where it is common to encounter temperature differences of 50 ° C. For a length of one hundred meters, the differential expansion between the waveguides and the steel structure is then sixty millimeters.
  • a known solution consists in giving, at the foot of the pylon, a very large radius of curvature to the waveguide in order to connect it to the transmitting station; the expansions then affect the radius of curvature without causing excessive deformations of the waveguide; in such a solution the waveguide, from the foot of the pylon to its top, must be fixed in a non-rigid manner to the steel structure of the pylon so that the expansion can play freely.
  • waveguides which make it possible to accept differences in expansion, especially in the case where the section of the waveguides is reduced: these are flexible waveguides. They have a relatively high attenuation and they are difficult to achieve when the waveguides have a large section, as is notably the case of the waveguides for television transmitting stations.
  • the object of the invention is to provide an expansion joint making it possible to absorb the variations in length of a waveguide due for example to significant variations in temperature.
  • the invention also aims to provide an expansion joint whose standing wave ratio remains low in all of the expansion range.
  • An expansion joint comprises in alignment a first and a second element of the same internal dimensions as the waveguide and free to move longitudinally relative to each other, the first element consisting of a tube, the second element comprising a trap established at least partly between said elements and outside the first element, the electrical length of said part being equal to half the wavelength of the transmitted central frequency. by the waveguide, said elements being separated longitudinally at the level of the trap by a distance which varies when the waveguide expands or contracts.
  • the expansion joint comprises a first element 1 and a second element 2 of rectangular waveguide, each element having at one end a flange, 3 and 4 respectively, for fixing these elements to the rectangular waveguide.
  • Elements 1 and 2 are not integral with one another, and can move longitudinally relative to one another along their axis.
  • the first element 1 is a rectangular cross-section tube; the second element 2 carries a trap folded over on each of its long sides each trap consists of two branches, a first branch 5 coming opposite the outside face of the first element 1, and a second branch 6, above the first branch, which has a folded end 7 which comes opposite the outer face of the first element, and covers the end of the first branch.
  • a first line 8 is thus obtained between the first element 1 and the first branch 5, and a second line 9 between the branches 5 and 6.
  • the first line has an average electrical length CD and the second line has an average electrical length AB.
  • the trap is folded to reduce its size, its average electrical length corresponds to the path ABCD E.
  • the electrical lengths AB and CD are close to a quarter of a wavelength, the electrical lengths BC and DE being small compared to the half length wave, so that the short circuit which is materialized in A is reported in E.
  • the half wavelength is equal to 25 centimeters, and the sum of the lengths electrical BC and DE is of the order of 2.5 to 3 centimeters.
  • elements 1 and 2 move relative to each other; the electrical length of the line CD is then only modified, causing a variation in the impedance brought back to point E.
  • these can be filled with a dielectric material such as, for example, polyethylene.
  • the path CDE In order not to introduce a standing wave ratio, with the trap, the path CDE must be equivalent to the path ABC and equal to a quarter of wavelength; of course if certain parts of these paths are in the polyethylene or in the air, this should be taken into account.
  • a variation of 50 millimeters can be obtained between the first and second elements 1 and 2 of the expansion joint. without affecting the standing wave ratio.
  • band IV of television the standing wave ratio of an expansion joint is less than 1.02 in a 60 MHz band.
  • the trap is only necessary on the long sides of the expansion joint, the interior dimensions of which are obviously the same as those of the waveguides to which it is fixed; however the short sides of the expansion joint elements move relative to each other; also to avoid friction between the metal parts one can interpose between these parts a plastic plate.
  • the expansion joint is sealed by means of a flexible rubber piece 10 fixed on the one hand to the flange 3 of the first element and on the other hand to the folded end 7 of the second element, all around the expansion joint. ; a metal cover 11, surrounding the first element, and consisting of two parts 12 and 13 which can move relative to each other when the elements of the expansion joint move, provides both mechanical protection of the part rubber and holding it in place.
  • waveguides such as those used in a television broadcasting station are filled with dry air under pressure, the normal pressure being of the order of 30 g / cm 2 ; under the effect of this pressure the rubber part moves away from the expansion joint, and in the absence of the metal cover it should withstand this pressure.
  • a column of 200 meters of waveguides successively comprises, from the top: at the level 200 meters an expansion joint, at the level 130 meters a weight support and below an expansion joint, at level 60 meters a new weight support and a third expansion joint, at the bottom of the pylon a third weight support.
  • the vertical forces introduced by the weight supports are taken from the triangulation nodes of the pylon provided for this purpose. effect.
  • the waveguide column is divided into three sections, each weight support having to support the weight of a third of the column, or approximately 2.5 tonnes for a rectangular guide of dimensions 43 x 21.5 centimeters in aluminum.
  • expansion joints eliminates the need to have a large radius of curvature of the waveguide at the foot of the pylon, to connect the pylon to the transmitting station itself.
  • this station being distant of several tens of meters from the pylon, the waveguide which connects it to the pylon can also include one or more expansion joints.
  • the invention is not limited to expansion joints for rectangular waveguides, whatever their dimensions, and generally applies to any type of waveguide and in particular to circular waveguides. , and in the latter case the trap is obviously circular.

Landscapes

  • Waveguide Connection Structure (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Building Environments (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP79100993A 1978-04-07 1979-04-02 Hohlleiterdilatationsverbindung Expired EP0004654B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7810480 1978-04-07
FR7810480A FR2422264A1 (fr) 1978-04-07 1978-04-07 Joint de dilatation pour guides d'ondes

Publications (2)

Publication Number Publication Date
EP0004654A1 true EP0004654A1 (de) 1979-10-17
EP0004654B1 EP0004654B1 (de) 1981-08-12

Family

ID=9206881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100993A Expired EP0004654B1 (de) 1978-04-07 1979-04-02 Hohlleiterdilatationsverbindung

Country Status (6)

Country Link
US (1) US4247838A (de)
EP (1) EP0004654B1 (de)
JP (1) JPS54134955A (de)
CA (1) CA1114463A (de)
DE (1) DE2960614D1 (de)
FR (1) FR2422264A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572221A1 (fr) * 1984-10-23 1986-04-25 Spinner Gmbh Elektrotech Piece de compensation pour conducteurs hf rigides
AU577064B2 (en) * 1983-06-30 1988-09-15 Hughes Aircraft Company Thermally-compensated microwave resonator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369413A (en) * 1981-02-03 1983-01-18 The United States Of America As Represented By The Secretary Of The Navy Integrated dual taper waveguide expansion joint
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
US4675633A (en) * 1985-08-05 1987-06-23 Harris Corporation Waveguide expansion joint
WO2016126505A1 (en) * 2015-02-08 2016-08-11 Hyperloop Technologies, Inc. Expansion joints, dampers and control systems for a tubular transportation structure stability system
US11421809B2 (en) 2016-03-07 2022-08-23 Hyperloop Technologies, Inc. Expansion joints for a tubular transportation system
US10651523B2 (en) 2018-04-12 2020-05-12 Transtector Systems, Inc. Waveguide connector assembly having bearings engageable by a movable sleeve to allow or prevent axial movement of the connector assembly, and an antenna and a polarizer, respectively formed therefrom

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434509A (en) * 1943-06-19 1948-01-13 Westinghouse Electric Corp Ultra high frequency conductor
US2451876A (en) * 1943-06-05 1948-10-19 Winfield W Salisbury Radio-frequency joint
DE820455C (de) * 1949-11-01 1951-11-12 Siemens & Halske A G Verbindungsstelle fuer Hohlrohrkabel
DE1591694A1 (de) * 1967-07-07 1971-03-04 Telefunken Patent Hohlleiteranordnung
US3660788A (en) * 1970-09-04 1972-05-02 Bell Telephone Labor Inc Waveguide expansion joint
US3822412A (en) * 1973-06-11 1974-07-02 Bell Telephone Labor Inc Waveguide expansion joint
DE2609076A1 (de) * 1976-03-05 1977-09-08 Kernforschung Gmbh Ges Fuer Koppeleinrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE320455C (de) * 1914-02-09 1920-04-22 Alexandre Schmitt Vorrichtung zum Umstimmen der Saiten von Musikinstrumenten
GB612406A (en) * 1942-06-18 1948-11-12 Sperry Gyroscope Co Inc Improvements in or relating to energy coupling devices for transferring high frequency energy
US2473834A (en) * 1944-01-25 1949-06-21 Raytheon Mfg Co Coupling between transmitter and wave guide system
US2837723A (en) * 1953-05-11 1958-06-03 Frank M Krantz Waveguide coupling
JPS492862U (de) * 1972-04-18 1974-01-11
US4020431A (en) * 1976-01-15 1977-04-26 Rockwell International Corporation Multiaxis rotary joint for guided em waves

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451876A (en) * 1943-06-05 1948-10-19 Winfield W Salisbury Radio-frequency joint
US2434509A (en) * 1943-06-19 1948-01-13 Westinghouse Electric Corp Ultra high frequency conductor
DE820455C (de) * 1949-11-01 1951-11-12 Siemens & Halske A G Verbindungsstelle fuer Hohlrohrkabel
DE1591694A1 (de) * 1967-07-07 1971-03-04 Telefunken Patent Hohlleiteranordnung
US3660788A (en) * 1970-09-04 1972-05-02 Bell Telephone Labor Inc Waveguide expansion joint
US3822412A (en) * 1973-06-11 1974-07-02 Bell Telephone Labor Inc Waveguide expansion joint
DE2609076A1 (de) * 1976-03-05 1977-09-08 Kernforschung Gmbh Ges Fuer Koppeleinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU577064B2 (en) * 1983-06-30 1988-09-15 Hughes Aircraft Company Thermally-compensated microwave resonator
FR2572221A1 (fr) * 1984-10-23 1986-04-25 Spinner Gmbh Elektrotech Piece de compensation pour conducteurs hf rigides

Also Published As

Publication number Publication date
DE2960614D1 (en) 1981-11-12
US4247838A (en) 1981-01-27
JPS54134955A (en) 1979-10-19
EP0004654B1 (de) 1981-08-12
FR2422264B1 (de) 1981-01-23
FR2422264A1 (fr) 1979-11-02
CA1114463A (fr) 1981-12-15

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