US2080514A - Conducting system - Google Patents
Conducting system Download PDFInfo
- Publication number
- US2080514A US2080514A US3125A US312535A US2080514A US 2080514 A US2080514 A US 2080514A US 3125 A US3125 A US 3125A US 312535 A US312535 A US 312535A US 2080514 A US2080514 A US 2080514A
- Authority
- US
- United States
- Prior art keywords
- conductor
- strips
- tubular
- portions
- coaxial
- 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 - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1808—Construction of the conductors
Definitions
- the wall thickness be of, the order of only 20 or 30 thousandths of an inch. Diametersmay be as small as a quarter of an inch. With these dimensions it is difficult, if not impossible, to produce a rugged self-supporting conductor by the use of ordinary interlocking profiled strips.
- a third restriction is imposed on the length of lay of the strips. Where the strips are interlocked against relative radial movement, as in a tongue and groove construction,. added strength may be obtained by spiraling the strips.
- a short spiral although it improves the mechanical characteristics, increases the efiective resistance of the tubular conductor and introduces an undesirable circular component of current. For this reason it is almost essential in many cases that the length of lay be at least ten times the internal diameter of the conductor.
- Fig. 1 shows a composite tubular conductor and a coaxial conductor system of the type to which the present invention relates;
- Fig. 2 is a cross-sectional view of the coaxial conductor structure illustrated in Fig. 1;. and- Figs. 3 and 4 show the profiles of two forms of the component strips that embody the invention.
- Fig. 1 shows a coaxial lapping fashion and held together in tubular form by means of the binding tapes 4 and 5.
- a protective lead sheath 6 may be extruded over.
- the assemblage asshown- Any suitable means may be-employed to maintain the conductor 3 in its central position, although preferably slotted washers pressed on to the central wire at intervals of the order of three-quarters of an inch are employed for this purpose.
- Fig. 2 is a cross-sectional view of the cable shown in Fig. 1.
- Fig. 3 shows one of the profiled strips in detail.
- tubular conductors of the type shown have been made up of profiled strips, similar in several respects to those shownin Figs. 3 and 4 but in which all angles were right angles and the two portions of each strip were of equal thickness. Applicant has found that this type of tubular conductor can be improved by making the inner portion of each of the profiled strips greater in thickness than the outer portion.
- The. inner portions are compressional members, forced together under the tension of the binding tape. Increasing the thickness of the inner portions, so as to provide a larger bearing surface for the abutting edges, reduces the tendency for one profiled strip to slip inwardly over an ad jacent strip, particularly during the process of manufacture, and it further improves the capacity of the conductor to withstand bending and rough handling.
- the low frequency attenuation of the coaxial conducting system is reduced, since at low frequencies skin effect is not great enough to confine the alternating currents to the inner surface of the conductor. It is especially important from a transmission standpoint that a smooth interior surface be obtained.
- Fig. 3 where the nominal inside diameter of the conductor was 0.27 inch and nine strips were used, the dimensions in mils were as follows: a, 95.3; b, 95.3; c, 67.6; d, 65.2; e, 5.0; t, 12.4; and t 9.2.
- the dimensions in mils were as follows: a, 115; b, 105; c, 68; d, 68; e and f, 5.0; t, 20; t, 10.
- a feature of the conductors herein described is that only the inner portion of the strips are or need be in abutting relation.
- the dimension n can be reduced so that a substantial gap is left between the outer portions, as indicated in Fig. 2.
- both edges of the inner portion of each strip are beveled.
- the amount of bevel is such that when the strips are assembled as a conductor, the beveled edges are radial in direction and the strips are in contact throughout the abutting surfaces.
- a flexible tubular conductor made up of a plurality of overlapping, interengaging strips each comprising two fiat laterally elongated striplike portions laterally oifset from each other, the inner of said portions being substantially thicker radially than the outer portions and disposed with their edges abutting the corresponding inner portions of adjacent strips, and an external member for forcing said abutting edges together, said outer portions being separated so that they do not interfere with the abutment of said inner portions.
- a high frequency transmission system comprising a pair of coaxial conductors, connected one as the return for the other, the outer of which is a flexible tubular conductor made up of a multiplicity of profiled strips each comprising two'integral strip-like portions laterally elongated and offset from each other in difl'erent tubular layers, adjacent strips being disposed with the edges of the inner portions abutting and the edges of the outer portions spaced apart, and an external member holding said strips in assemblage, the inner portions of said strips being substantially thicker radially than the outer portions so as to provide compressionresisting strength and a relatively thick tubular shell for the transmission'of electrical waves.
Landscapes
- Communication Cables (AREA)
- Waveguides (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3125A US2080514A (en) | 1935-01-23 | 1935-01-23 | Conducting system |
GB31679/35A GB455535A (en) | 1935-01-23 | 1935-11-15 | Improvements in or relating to coaxial conductor electric cables |
FR46938D FR46938E (fr) | 1935-01-23 | 1935-12-14 | Conducteurs électriques et procédé de fabrication |
DEI54041D DE738035C (de) | 1935-01-23 | 1936-01-10 | Luftraumisolierte konzentrische Fernmeldeleitung fuer Hochfrequenzuebertragung |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3125A US2080514A (en) | 1935-01-23 | 1935-01-23 | Conducting system |
Publications (1)
Publication Number | Publication Date |
---|---|
US2080514A true US2080514A (en) | 1937-05-18 |
Family
ID=21704284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US3125A Expired - Lifetime US2080514A (en) | 1935-01-23 | 1935-01-23 | Conducting system |
Country Status (4)
Country | Link |
---|---|
US (1) | US2080514A (fr) |
DE (1) | DE738035C (fr) |
FR (1) | FR46938E (fr) |
GB (1) | GB455535A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2480106A (en) * | 1945-06-11 | 1949-08-30 | Int Standard Electric Corp | Concentric conductor electric cable |
US2600111A (en) * | 1946-02-08 | 1952-06-10 | Hans D Isenberg | Coaxial cable with spiral spacer |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1018949B (de) * | 1953-04-25 | 1957-11-07 | Hackethal Draht & Kabelwerk Ag | Koaxiales Hochfrequenzkabel mit rohrfoermigem Aussenleiter |
US3316344A (en) * | 1965-04-26 | 1967-04-25 | Central Electr Generat Board | Prevention of icing of electrical conductors |
-
1935
- 1935-01-23 US US3125A patent/US2080514A/en not_active Expired - Lifetime
- 1935-11-15 GB GB31679/35A patent/GB455535A/en not_active Expired
- 1935-12-14 FR FR46938D patent/FR46938E/fr not_active Expired
-
1936
- 1936-01-10 DE DEI54041D patent/DE738035C/de not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2480106A (en) * | 1945-06-11 | 1949-08-30 | Int Standard Electric Corp | Concentric conductor electric cable |
US2600111A (en) * | 1946-02-08 | 1952-06-10 | Hans D Isenberg | Coaxial cable with spiral spacer |
Also Published As
Publication number | Publication date |
---|---|
GB455535A (en) | 1936-10-22 |
FR46938E (fr) | 1936-11-07 |
DE738035C (de) | 1943-07-31 |
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