EP0004654B1 - Hohlleiterdilatationsverbindung - Google Patents

Hohlleiterdilatationsverbindung Download PDF

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Publication number
EP0004654B1
EP0004654B1 EP79100993A EP79100993A EP0004654B1 EP 0004654 B1 EP0004654 B1 EP 0004654B1 EP 79100993 A EP79100993 A EP 79100993A EP 79100993 A EP79100993 A EP 79100993A EP 0004654 B1 EP0004654 B1 EP 0004654B1
Authority
EP
European Patent Office
Prior art keywords
expansion joint
components
component
trap
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.)
Expired
Application number
EP79100993A
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English (en)
French (fr)
Other versions
EP0004654A1 (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 stations.
  • the waveguides When the waveguides are very long and are arranged in an environment where the temperature differences are large, 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 effect the radius of curvature sand 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 cross section, as is notably the case of the waveguides for television transmitting stations.
  • US Patent 3822412 describes an expansion joint for a waveguide comprising 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 being constituted by a tube, said elements being separated longitudinally by a distance which varies when the waveguide expands or contracts.
  • US Patent 2,434,509 describes a junction for coaxial cable comprising a trap disposed between two aligned tubular elements fixed to each other, and of electrical length equal to half the wavelength of the electromagnetic radiation to be transmitted, this trap being folded up and formed by two branches arranged between coaxial rings, each of the branches being of length close to a quarter of the wavelength.
  • the present invention aims to provide an expansion joint that allows to ensure the electrical continuity of the wave across the expansion guide beach, and thus ensures a low standing wave ratio regardless of the temperature which is worn the expansion joint.
  • the expansion joint according to the invention is characterized in that the second element comprises a trap established at least partially between said elements and outside the first element, the trap having an electrical length equal to half the length d wave corresponding to the central frequency transmitted by the waveguide and being re-aligned so as to obtain two lines having substantially the same electrical length, a first line consisting of a space between the first element and a first branch of the second element , a second line consisting of a space between said first branch and a second branch, one end of which is folded back and comes opposite said external face of the first element, and covers one end of said first branch, the second line having a width greater than that of the first line, therefore a greater impedance.
  • 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 facing 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 the wavelength, the electrical lengths triques BC and DE being small compared to the half-wavelength, so that the short-circuit which is materialized in A is reported in E.
  • the half-length d wave is equal to 25 centimeters, and the sum of the electrical lengths BC and DE is of the order of 2.5 to 3 centimeters.
  • elements 1 and 2 move relative to each other; the electric 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; well extended if some parts of these paths are in polyethylene or in the air, it 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 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 keeps 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 / cm2; 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.
  • 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 may also include one or more expansion joints.
  • the invention is not limited to expansion joints for rectangular waveguides, whatever their dimensions, and is generally applicable to any type of waveguide and in particular to circular waveguides. , and in the latter case the trap is obviously circular.

Landscapes

  • Non-Reversible Transmitting Devices (AREA)
  • Waveguide Connection Structure (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Building Environments (AREA)

Claims (7)

1. Dehnungsdichtung für Wellenleiter, die in Flucht ein erstes und ein zweites Element mit gleichen inneren Abmessungen wie der Wellenleiter aufweist, welche sich frei in Längsrichtung zueinander bewegen können, wobei das erste Element (1) aus einem Rohr besteht und die Elemente in Längsrichtung einen Abstand voneinander aufweisen, der sich verändert, wenn der Wellenleiter sich ausdehnt oder zusammenzieht, dadurch gekennzeichnet, daß das zweite Element (2) eine Falle (5, 6) aufweist, die sich zumindest zum Teil zwischen den Elementen und außerhalb des ersten Elements befindet, wobei die Falle eine elektrische Länge hat, die gleich der Hälfte der Wellenlänge ist, die der zentralen vom Wellenleiter übertragenen Frequenz entspricht, und so zusammengefaltet ist, daß zwei Leitungen mit in etwa der gleichen elektrischen Länge erhalten werden und eine erste Leitung (8) aus einem Raum zwischen dem ersten Element und einem ersten Zweig des zweiten Elements besteht, während eine zweite Leitung (9) aus einem Raum zwischen dem ersten Zweig und einem zweiten Zweig besteht, dessen eines Ende (7) geknickt ist und sich gegenüber der Außenseite des ersten Elements befindet und ein Ende des erstes Zweiges überdeckt, während die zweite Leitung eine größere Breite als die erste und daher eine höhere Impedanz aufweist.
2. Dehnungsdichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Falle mit einem dielektrischen Material gefüllt ist.
3. Dehnungsdichtung nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß sie ein flexibles Isolierstück (10) zwischen den Elementen aufweist, um die Dichtigkeit zu sichern.
4. Dehnungsdichtung nach Anspruch 3, dadurch gekennzeichnet, daß eine Metallhaube (11) das flexible Isolierstück ganz bedeckt, wobei die Haube aus zwei Teilen (12, 13) besteht, die in Bezug aufeinander frei gleiten können.
5. Dehnungsdichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie ein flexibles Isolierstück (10) zwischen den Elementen aufweist, um die Dichtigkeit zu sichern.
6. Dehnungsdichtung nach Anspruch 5, dadurch gekennzeichnet, daß eine Platte aus Kunstoffmaterial zwischen jeder der kleinen Seiten des ersten und zweiten Elements angebracht ist.
7. Dehnungsdichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet daß die beiden Elemente durch pneumatische Stempel (14) miteinander verbunden sind, um sie für die Montage auf einer bestimmten Entfernung zu halten, die von der Umgebungstemperatur abhängig ist, wobei die Stempel nach Verbindung der Elemente mit dem Wellenleiter entfernt werden.
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 EP0004654A1 (de) 1979-10-17
EP0004654B1 true 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)

Families Citing this family (8)

* 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
WO1985000698A1 (en) * 1983-06-30 1985-02-14 Hughes Aircraft Company Thermally-compensated microwave resonator utilizing variable current-null segmentation
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
DE3438826C1 (de) * 1984-10-23 1986-02-27 Spinner GmbH Elektrotechnische Fabrik, 8000 München Ausgleichsstück für starre, mit Druckgas gefüllte HF-Leitungen
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

Family Cites Families (13)

* 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
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
US2473834A (en) * 1944-01-25 1949-06-21 Raytheon Mfg Co Coupling between transmitter and wave guide system
DE820455C (de) * 1949-11-01 1951-11-12 Siemens & Halske A G Verbindungsstelle fuer Hohlrohrkabel
US2837723A (en) * 1953-05-11 1958-06-03 Frank M Krantz Waveguide coupling
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
JPS492862U (de) * 1972-04-18 1974-01-11
US3822412A (en) * 1973-06-11 1974-07-02 Bell Telephone Labor Inc Waveguide expansion joint
US4020431A (en) * 1976-01-15 1977-04-26 Rockwell International Corporation Multiaxis rotary joint for guided em waves
DE2609076C3 (de) * 1976-03-05 1979-04-05 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Koppelelnrlchtung zur Ankopplung eines HF-Generators an eine supraleitende, in einem Kiyostaten angeordnete Resonatorstrnktur

Also Published As

Publication number Publication date
DE2960614D1 (en) 1981-11-12
US4247838A (en) 1981-01-27
JPS54134955A (en) 1979-10-19
FR2422264B1 (de) 1981-01-23
EP0004654A1 (de) 1979-10-17
FR2422264A1 (fr) 1979-11-02
CA1114463A (fr) 1981-12-15

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