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Publication numberUS3605046 A
Publication typeGrant
Publication dateSep 14, 1971
Filing dateMar 12, 1969
Priority dateMar 12, 1969
Publication numberUS 3605046 A, US 3605046A, US-A-3605046, US3605046 A, US3605046A
InventorsMiller Stewart E
Original AssigneeBell Telephone Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Deflection-free waveguide arrangement
US 3605046 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [72] inventor Stewart E. Miller Middletown Township, Monmouth County, NJ. [21] Appl. No. 806,663 [22] Filed Mar. 12, 1969 [45] Patented Sept. 14, 1971 [73] Assignee Bell Telephone Laboratories, Inc.

Murray Hill, NJ.

[54] DEFLECI'ION-FREE WAVEGUIDE ARRANGEMENT 3 Claims, 3 Drawing Figs.

[52] [1.8. CI 333/95, 333/98, 138/155, 29/600 [51] lnt.Cl. l-l0lp l/04, HOlp 3/12, HOlp 11/00 [50] Field olSearch 333/95, 98; 29/600, 601; 138/114, 142, 155

[56] Referencs Cited UNITED STATES PATENTS 3,007,122 10/1961 Geyling 333/95 3,149,295 9/1964 Grebe 333/98 3,359,351 12/1967 Bender 138/155 X 3,390,901 7/1968 Bibb 333/98 X 3,479,621 1 H1969 Martin 333/95 2,848,696 8/1958 Miller 333/95 2,950,454 8/1960 Unger 333/95 FOREIGN PATENTS 1,180,657 6/1959 France 333/98 OTHER REFERENCES Virgile; L. G., Deflection of Waveguide Subjected to Intemal Pressure," M'IT- 5, 10/1957, pp. 247- 250.

Primary Examiner-Herman Karl Saalbach Assistant Examiner-Wm. 1-1. Punter Attorneys-R. J. Guenther and Arthur J. Torsiglieri IIIIIIIIIIIIIIIIIIIIIIll!!! IIIIIIIIIIIII'I III \W7777777777ZZZZ44444 INVENIOR S. E. MILLER ATTORNEY DEFLECTION-FREE WAVEGUIDE ARRANGEMENT This invention relates to a waveguide transmission line which is substantially free of deflections from straightness along short sections.

BACKGROUND OF THE INVENTION Waveguide transmission lines are now deemed feasible for use as extremely broad frequency band transmission media for long-distance communications systems. (See, for example, S. E. Miller, Waveguide as a Communication Medium, 33 BST] 1209, Nov. 1954). Among numerous other requirements for satisfactory service, such a transmission line must be protected from deflections in short sections caused, for example, by falling rocks in back-filling the trench in which the waveguide is placed. Otherwise unwanted mode conversions will take place at such deflections, resulting in a loss to the system.

SUMMARY OF THE INVENTION In accordance with the invention, the waveguide is formed as a series of sections, each section being disposed within a larger rigid jacket and bound, under tension, at both ends of the jacket. Advantageously, the space between the waveguide wall and the jacket is filled with a flexible material such as rubber or plastic foam. Thus, along most of its length, the section of waveguide is mechanically isolated from the rigid jacket, and typical deformations of the jacket are not transmitted to the waveguide.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the invention will become apparent from the following detailed description of the arrangements illustrated in the drawings in which:

FIG. 1 illustrates a cross section of a waveguide transmission line in accordance with the invention;

FIG. 2 illustrates the effect of short period deflections on a section of the waveguide transmission line of FIG. 1; and

FIG. 3 illustrates a section of helical waveguide in accordance with the invention.

DETAILED DESCRIPTION FIG. 1 illustrates a cross section of a waveguide transmission line in accordance with the invention comprising a plurality of coupled sections 9 of waveguide structure. Each section comprises a section of waveguide 10, such as circular electric mode helical waveguide, mechanically coupled to a rigid outer jacket 11, such as a steel tube by solid supports 12 capable of maintaining waveguide 10 under a tension of a few thousand pounds. For example, supports 12 can comprise annular metal rings securely welded to jacket 11 and having an inside diameter approximately equal to the waveguide and a length of a few inches. The waveguide can then be brazed or welded to the inner surface of the rings while under tension. Alternatively, both the rings and the ends of the waveguide can be threaded to provide a simple means of applying tension and epoxy resin, for example, can be used to lock the threads in position.

The space between waveguide 10 and rigid jacket 11 is advantageously filled with a flexible material such as foam rubber which provides sufficient resistance to reduce sag in the waveguide from gravity but is sufficiently flexible that the tension on the waveguide will keep it straight despite localized deflections of the rigid jacket. FIG. 2 illustrates, in a somewhat exaggerated manner, the effect of a deflection on a section of waveguide structure. While the rigid jacket bends, the flexible foam transmits only a negligible portion of the distorting force, and the tension on the waveguide keeps it substantially straight.

FIG. 3 shows a section of a typical millimeter, circular electric mode transmission system employing the techni ues of the present invention. The section includes a length of elical waveguide 30, of the type described by S. E. Miller in U.S. Pat. No. 2,848,696, comprising an inner helix 3], surround by a lossy dielectric material 32, and an outer protective metallic cylinder 33 having a wall thickness of about one-tenth of an inch. The rigid jacket 11 is 3/ l6inches steel pipe having an inside diameter of about 3 inches. The structure can be conveniently fabricated in sections of 15 to 30 feet in length. The tension between the waveguide and the rigid jacket depends upon the strength of the waveguide. For a typical helical waveguide structure of the type described above, the tension is on the order of a few thousand pounds, typically about 5,000 pounds.

Numerous and varied other arrangements and modifications of the above-disclosed specific illustrative embodiment can be readily devised by those skilled in the art without departing from the spirit and scope of the invention.

What is claimed is:

l. A waveguide transmission line comprising a plurality of coupled sections of waveguide structure, each section comprising:

a section of waveguide in a state of tension;

a section of a rigid outer jacket spaced away from said waveguide; and

means at each of the ends of the rigid outer jacket for mechanically coupling said waveguide to said jacket while simultaneously maintaining said waveguide in said state of tension.

2. A structure according to claim 1 wherein the space between said waveguide and said rigid jacket is filled with a material to reduce sag in the waveguide from gravity, said material being sufficiently flexible that the tension on the waveguide will keep it substantially straight despite small deflections on the rigid jacket.

3. A waveguide structure comprising:

a section of waveguide in a state of tension;

a section of a rigid outer jacket spaced away from said waveguide; and

means at each of the ends of the rigid outer jacket for mechanically coupling said waveguide to said jacket while simultaneously maintaining said waveguide in said state of tension.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2848696 *Mar 15, 1954Aug 19, 1958Bell Telephone Labor IncElectromagnetic wave transmission
US2950454 *Oct 30, 1958Aug 23, 1960Bell Telephone Labor IncHelix wave guide
US3007122 *Dec 21, 1959Oct 31, 1961Bell Telephone Labor IncSelf realigning waveguide support system
US3149295 *May 28, 1962Sep 15, 1964Dow Chemical CoWaveguide joining by criss-cross welding of extended flanges
US3359351 *Oct 18, 1965Dec 19, 1967Bender Richard BMethod of applying insulation coating for pipe
US3390901 *Feb 27, 1967Jul 2, 1968Gen ElectricQuick disconnect flangeless waveguide coupling
US3479621 *May 29, 1967Nov 18, 1969Kabel Metallwerke GhhForm stabilized wave guides
FR1180657A * Title not available
Non-Patent Citations
Reference
1 *Virgile; L. G., Deflection of Waveguide Subjected to Internal Pressure, MTT 5, 10/1957, pp. 247 250.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3748606 *Dec 15, 1971Jul 24, 1973Bell Telephone Labor IncWaveguide structure utilizing compliant continuous support
US3750058 *Dec 8, 1971Jul 31, 1973Bell Telephone Labor IncWaveguide structure utilizing compliant helical support
US3914861 *Sep 16, 1974Oct 28, 1975Andrew CorpCorrugated microwave horns and the like
US4043029 *Dec 24, 1975Aug 23, 1977Societe Anonyme De TelecommunicationsWaveguide and process for making the same
US4090280 *Jan 28, 1977May 23, 1978Les Cables De Lyon S.A.Manufacture of helical wave guides
US4176691 *Apr 17, 1978Dec 4, 1979British Gas CorporationApparatus for arresting propagating fractures in pipelines
US4225833 *Jun 6, 1978Sep 30, 1980Les Cables De LyonHelical circular wave guide having low loss around curves and over a wide frequency band
US4486725 *Aug 23, 1982Dec 4, 1984International Telephone And Telegraph CorporationProtective sheath for a waveguide suspended above ground
US4725395 *Jan 7, 1985Feb 16, 1988Motorola, Inc.Antenna and method of manufacturing an antenna
US5129396 *Sep 18, 1990Jul 14, 1992Arye RosenMicrowave aided balloon angioplasty with lumen measurement
US7737361 *Feb 25, 2008Jun 15, 2010Corning Cable Systems LlcSealant gel for a telecommunication enclosure
DE2826873A1 *Jun 19, 1978Jan 18, 1979Cables De Lyon Geoffroy DeloreRunder wendelhohlleiter
EP2849276A1 *Aug 28, 2014Mar 18, 2015ThinKom Solutions, Inc.Ruggedized low-reflection/high transmission integrated spindle for parallel-plate transmission-line structures
Classifications
U.S. Classification333/242, 138/172, 29/600, 333/248, 138/155, 333/239, 138/143, 138/149
International ClassificationH01P3/00, H01P3/127
Cooperative ClassificationH01P3/127
European ClassificationH01P3/127