US3792386A - Rectangular waveguide having shaped external contour preventing internal deformation during bending or twisting - Google Patents

Rectangular waveguide having shaped external contour preventing internal deformation during bending or twisting Download PDF

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Publication number
US3792386A
US3792386A US00343881A US3792386DA US3792386A US 3792386 A US3792386 A US 3792386A US 00343881 A US00343881 A US 00343881A US 3792386D A US3792386D A US 3792386DA US 3792386 A US3792386 A US 3792386A
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United States
Prior art keywords
waveguide
section
sides
longer
shorter
Prior art date
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Expired - Lifetime
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US00343881A
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English (en)
Inventor
R Schuster
W Loew
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Siemens AG
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Siemens AG
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    • 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
    • H01P3/12—Hollow waveguides
    • H01P3/14—Hollow waveguides flexible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/11—Shape

Definitions

  • the present invention relates to rectangular waveguides of a flexible nature such that they can be bent, twisted or coiled, andmore particularly to such waveguides in which the external contours of the longer and shorter sides of the section are such that, when bent, the interior of the waveguide remains substantially constant in shape.
  • waveguides of this general type areof particular use as connecting links between an antenna and the transmit/receive units of radio relay equipment operating at frequencies above 3 GHZ. It is well known in the art to construct such waveguide links from rigid sections, namely straight waveguides, elbows and twist members, these being manufactured in a factory and assembled together on site to provide a requiredconfiguration. However, the actual local dimensions frequently deviate fromthose originally specified, or are subject to modifications required for particular cases, so that the use of such prefabricated rigid components may not be possible, since any assembly will not fit, and special lengths of waveguide sections and tailor-made pieces may have to be subsequently produced.
  • a waveguide which can be adapted on site to the prevailing requirements of the particular. application and has at last the same transmission quality as the rigid waveguide lengths heretofore employed.
  • This prior art waveguide has a cross sectional profile such that when it is bent with respect to, or twisted about, its longitudinal axis, its internal cross section substantially retains its original shape to an optimum extent.
  • a guide of substantial length can be manufactured, and delivered conveniently in a coiled state to the required site, where it is then curved, bent and sides to form lips, one at each corner, and their shape 7 is such that the individual shorter sides and the individtwisted, as required, during assembly to provide the required configuration for the link.
  • One objectof the present invention is to provide an improved flexible waveguide of the type just mentioned, so that while retaining optimum integrity of shape for the internal cross section when the waveguide is bent or twisted, the couples or moments required to produce the shaping are reduced.
  • the invention resides in the provision of a rectangular waveguide in which the internal contours of the longer and shorter sides of the section are in each case drawn in toward the center,'preferably in circular or arcuate form, and in which the differing wall thicknesses in the peripheral direction of the waveguide cross section produced by these formations are chosen such that when the waveguide is bent, opposing couples which are located in the plane of section, but outside I the internal contour, are developed and act in association with couples producing bending in the same direction to cancel out any turning effect of the couple which produces deformation of the cross section, so that when bent .the waveguide interior substantially retains its shape.
  • the longer sides of the 'waveguide section are extendedbeyond the shorter ual corner sections of the waveguide cross section each form a substantially symmetrical T-section profile, while in relation to the individual] longer sides a radically asymmetrical T-section profile is produced at each corner.
  • the lips extend parallel to the longer sides of the inner waveguide section at least in the zone of forming the continuation of the external contour of the longer sides.
  • a further advantage is the extremely simple geometrical external contour of the waveguide, which is such that press molds, flanges and attachment elements for the waveguide can be simplified and the processing required when fitting the flanges is facilitated. Furthermore, this kind of shaping, to promote the retention of the waveguide internal cross section, has the result that when the waveguide is coiled, good, stable supporting surfaces are obtained, and such shaping enables simple bending tools to be employed for the waveguide to be bent or twisted on site, in order to route the waveguide in the desired manner.
  • a still further advantage resides in the provision of a rectangular waveguide constructed in accordance with the invention wherein direct coupling to standard waveguide components, which normally have a rectangular cross section, and to conventional rigid rectangular waveguide sections, can be effected without the need for waveguide junctions.
  • standard waveguide components which normally have a rectangular cross section
  • rigid rectangular waveguide sections can be effected without the need for waveguide junctions.
  • it is advantageously provided through the ability to discard elbows, twist sections and intermediate sections of pre-manufactured types, that a substantial economy is achieved in terms of planning time and assembly costs.
  • the thickness of the waveguide wall in the plane determined by each of the individual shorter sides is such that it satisfies the condition M h '0, where:
  • M is the turning moment to be compensated
  • h is the thickness of the waveguide wall
  • the outlay in material for the waveguide is advantageously reduced, while retaining adequate stability, so that the forces required to bend and twist the waveguide are reduced and the assembly of the waveguide is facilitated.
  • the embodiment illustrated in the drawing has a rectangular internal cross sectional profile, defined by longer sides I, and shorter sides 2.
  • the waveguide is profiled to provide the required external contour, and is preferably constructed of soft material having good electrical conductivity, in particular aluminum.
  • the waveguide may be produced, for example, by an extrusion process. When bending the waveguide about the E- point, indicated in the drawing as an X'X bending plane, tensile and compressive stresses are generated parallel to the bending plane and these result in forces which are directed perpendicular to the bending plane.
  • the cross sectional distortion can be controlled by suitable dimensioning of the cross sectional area.
  • a minimum cross section distortion can be achieved if the external contour is so chosen tha t during bending of the waveguide, turning moments M are produced which act together with turning moments M to cancel any deforming action of the moments
  • the external contours of the longer sides 1 and the shorter sides 2 are in each case drawn in toward the center, preferably in circular arcuate form, so that differing wall thicknesses are produced in the waveguide section in different circumferential directions.
  • the longer sides 1 of the waveguide each extend beyond the shorter sides 2 to form the lips 3.
  • the lips 3 have longer sides extending in the direction of the longer sides l'of the waveguide section, and in each case at least that side which constitutes the extension of the external profile of the associated longer side'l should be disposed parallel to the longer side 1 of the internal waveguide cross section. At their ends, the lips 3 are cross sectional area available for resisting turning moments is maintained. In the neighborhood of the lip 3, when the waveguide is bent, opposing turning moments M located in the cross sectional plane, but outside the internal contour, are produced, and these, together with the turning moments M acting in the same sense, cancel out the turning action of the other moments M which are responsible for producing the cross sectional distortion.
  • the waveguide wall has a thickness h for the longer sides 1 of the section in the planes determined by the individual shorter sides, and this is preferably fixed at a minimum permissible value to advantageously provide a reduction in the amount of material, and also in the reduction in the requisite bending moments.
  • the thickness of the waveguide wall is so chosen that it satisfies the condition M z h 6; where:
  • M is the turning moment which is to be compensated
  • h is the thickness of the waveguide wall at the longer side of the section in the plane of each shorter side
  • 8 is the maximum permissible bending stress in the material of which the waveguide wall is made.
  • the thickness of the waveguide w all should then be selected to be at least sufficiently large, but preferably not substantially larger than, that required to satisfy the condition M h 8 /6.
  • the rectangular section waveguide illustrated in the drawing has been drawn substantially to scale so that the dimensions correspond to the true size ratio.
  • a rectangular waveguide comprising: four sides including a pair of parallel longer sides and a pair of parallel sides shorter than said longer sides, said longer and shorter sides including external contours, as viewed in section, which are in each case drawn toward the center of the respective side, said sides having differing wall thicknesses in the peripheral direction of the waveguide cross section and dimensioned such that when the waveguide is bent, opposing couples located in the plane of a section and outside the internal contour of the waveguide are developed and act in association with couples producin'g'bending in the same direction to cancel out any turning of a resulting couple which would produce deformation of the cross section, so that when bent the waveguide interior substantially retains its rectangular shape, said longer sides of said waveguide section extending beyond said shorter sides to form lips at each corner of the waveguide, said lips having a shape such that the individual shorter sides and the individual corner sections of the waveguide cross section each form a substantially symmetrical T- section profile, while in relation to the individual longer sides a radically asymmetrical T-section profile is produced at each corner,
  • M is the turning moment to be compensated
  • h is the thickness of th waveguide wall at a longer side
  • 6 is the maximum permissible lbending stress in the material used for the waveguide wall.

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  • Waveguides (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
US00343881A 1972-04-07 1973-03-22 Rectangular waveguide having shaped external contour preventing internal deformation during bending or twisting Expired - Lifetime US3792386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2216802A DE2216802A1 (de) 1972-04-07 1972-04-07 Aufwickelbarer und biegbarer rechteckhohlleiter zur uebertragung elektromagnetischer wellen

Publications (1)

Publication Number Publication Date
US3792386A true US3792386A (en) 1974-02-12

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Application Number Title Priority Date Filing Date
US00343881A Expired - Lifetime US3792386A (en) 1972-04-07 1973-03-22 Rectangular waveguide having shaped external contour preventing internal deformation during bending or twisting

Country Status (16)

Country Link
US (1) US3792386A (fr)
JP (2) JPS4915975A (fr)
AT (1) AT333345B (fr)
BE (1) BE797873A (fr)
BR (1) BR7302512D0 (fr)
CA (1) CA1007721A (fr)
CH (1) CH551085A (fr)
DE (1) DE2216802A1 (fr)
DK (1) DK143375C (fr)
FR (1) FR2179041B1 (fr)
GB (1) GB1425503A (fr)
IL (1) IL41736A (fr)
IT (1) IT982685B (fr)
NL (1) NL153732B (fr)
NO (1) NO133298C (fr)
SE (1) SE390854B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253826A (en) * 1979-09-10 1981-03-03 Campbell Frank Jun Truncated triangular skid pipe
US6453950B1 (en) * 2000-11-28 2002-09-24 Donald Smith Tube for conveying a liquid
US20070045497A1 (en) * 2005-08-31 2007-03-01 Illinois Tool Works Inc. Plastic coil separator
US20120279401A1 (en) * 2011-05-06 2012-11-08 Prince Castle LLC Egg Scrambler for Preparing Scrambled Eggs
US20170314544A1 (en) * 2016-04-29 2017-11-02 Saint-Gobain Performance Plastics Corporation Peristaltic pump tube with non-uniform lumen profile
CN115411472A (zh) * 2022-09-06 2022-11-29 上海航天测控通信研究所 一种用于Ka频段二维转动机构的波导结构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585540A (en) * 1967-07-20 1971-06-15 Telefunken Patent Flexible waveguide having means to reduce deformation of internal cross section
US3603905A (en) * 1968-10-05 1971-09-07 Telefunken Patent Symmetrical flexible waveguide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585540A (en) * 1967-07-20 1971-06-15 Telefunken Patent Flexible waveguide having means to reduce deformation of internal cross section
US3603905A (en) * 1968-10-05 1971-09-07 Telefunken Patent Symmetrical flexible waveguide

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253826A (en) * 1979-09-10 1981-03-03 Campbell Frank Jun Truncated triangular skid pipe
WO1981000759A1 (fr) * 1979-09-10 1981-03-19 F Campbell Tube de patin triangulaire tronque
US6453950B1 (en) * 2000-11-28 2002-09-24 Donald Smith Tube for conveying a liquid
US20070045497A1 (en) * 2005-08-31 2007-03-01 Illinois Tool Works Inc. Plastic coil separator
US20120279401A1 (en) * 2011-05-06 2012-11-08 Prince Castle LLC Egg Scrambler for Preparing Scrambled Eggs
US20170314544A1 (en) * 2016-04-29 2017-11-02 Saint-Gobain Performance Plastics Corporation Peristaltic pump tube with non-uniform lumen profile
US10557465B2 (en) * 2016-04-29 2020-02-11 Saint-Gobain Performance Plastics Corporation Peristaltic pump tube with non-uniform lumen profile
CN115411472A (zh) * 2022-09-06 2022-11-29 上海航天测控通信研究所 一种用于Ka频段二维转动机构的波导结构

Also Published As

Publication number Publication date
IT982685B (it) 1974-10-21
FR2179041B1 (fr) 1977-09-02
DK143375B (da) 1981-08-10
JPS4915975A (fr) 1974-02-12
DK143375C (da) 1981-12-14
AU5316673A (en) 1974-09-26
BR7302512D0 (pt) 1974-07-11
NL7304795A (fr) 1973-10-09
NO133298C (fr) 1976-04-07
JPS5446236U (fr) 1979-03-30
FR2179041A1 (fr) 1973-11-16
IL41736A0 (en) 1973-05-31
DE2216802A1 (de) 1973-10-18
AT333345B (de) 1976-11-10
CA1007721A (en) 1977-03-29
SE390854B (sv) 1977-01-24
ATA231673A (de) 1976-03-15
NL153732B (nl) 1977-06-15
IL41736A (en) 1976-05-31
BE797873A (fr) 1973-07-31
NO133298B (fr) 1975-12-29
CH551085A (de) 1974-06-28
GB1425503A (en) 1976-02-18

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