US1900976A - Concentric conductor system - Google Patents

Description

March. 14, 1933. A. CARPE El AL CONCENTI'RIC CONDUCTOR SYSTEM Filed May 22, 1930 Dielectric Sheet Jhbz'm semisect twisted toyet 7Vlded, seldered or bva ed INVENTORS v Z r e QF/ZZL' e ATTORNEY Patented Mar. 14, 1933 UNITED STATES PATENT orrics ALLEN CABPE, NEW YORK, N. Y AND FRANK A. LEIIBE, OF DUNELLEN, NEW JERSEY,

ASSIGNOB8 '10 AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORPORA- 'IION OF NEW'YOBK commmcrc connno'ron sysrm Application m m 22,

This invention relates to concentric conductor systems, and particularly to the mechanical and electrical construction of such systems. A. concentric conductor system as ordinarily constructed comprises inner and outer tubular conductors concentrically arranged and suitably spaced from each other by means of insulating washers or elements strung along the inner conductor. The two conductors are, of course, so connected that one acts as a return for the other. In accordance with the resent invention, it is proposed to simpli y the construction by using spirally arranged dielectric spacing material instead of spaced washers or equivalent devices for se arating the inner and outer conductors. his is accomplished by forming the inner tubular conductor of two semi-circular pieces of tubin with their fiat sides abutting, and with die ectric material in the form of thin, flat sheets laid between the two pieces of tubing, the flat sheet of dielectric material being of greater width than the diameter of the inner conductor. The elements thus arranged are twisted so that the dielectric sheet is in the form of a spiral. The outer conductor will then have an inner diameter corresponding to the diameter of the spiral dielectric. If desired, the outer conductor may be formed from a flat sheet of copper or other suitable conductive material, bymeans of a die which folds the .flat conductive material with its edges abutting to form-the tube, the inner core comprising the dielectric element and the two semi-circular ieces of tubing being fed in' during the formation of the outer conductor. v

The invention will now be more fully un'- 'derstood from the followin description when read in connection wit the accom pan ing drawing in which Figure 1 is a sectional view showing the arrangement of the. two pieces of tubing comprisin the inner concentric conductor and the ielectric sheet; Fi 2 shows these elements after being spira y twisted to form the core of the system; Fi 3 is a drawing showing how the out r c n u tor is rin d a d mounted 1980. I Serial No. 454,784.

conductor comprisingthe elements 1 and 1. -After the dielectric and semi-circular tub-' ing elements have been mounted together, as shown in Fig. 1, they are twisted into spiral form as indicated invFig. 2, t6 form the core of the concentric conductor system. The outer conductor may be in the '10 form of a tube whose inner surface has a diameter sufiicient to slide over the dielectric spiral element 2, but preferably it is constructed from a sheet of flat conductive material 3 passed through a circular die 4 s0 76 that the two edges of the sheet are brought together to form an outer tubular conductor 5. The inner core, comprisin the spiral dielectric 2 and semi-circular tu es 1 and 1', is fed into the outer conductor 5 during the 80 process of passing the sheet -3 through the die-4, so that the conductor may be made up in lengths as long as desired. Preferably, the abutting edges of the outer tubular conductor 5 will be united by welding, solder- 35 ing or brazing to make the system watertight. If desired, however, the entire outer conductor may be covered by a sheath of lead or other material. on

In order to prevent slippage of the dielectric sheet 2 with respect to the semi-circular tubes 1 and 1, these elements may be arranged as shown in Fig. 4 so that ribs are formed along the central axis of the dielectric sheet 2 and corresponding grooves, are provided in the flat sides of the semi-circular tubes 1 and 1'. By locating the ribs.of the dielectric element in the grooves of the semicircular sections of tubing, the parts will be 100 folded together and abutting each other over 7 the other for a low frequency transmission system Without interference with the relatively high frequency transmission taking 10 place over the outer conductor 5 with the inner conductors 1 and 1' acting as a return therefor.

It will be obvious-that the general principles herein disclosed may be embodied in many other organizations widely different from those illustrated without departing from the spirit of the invention as defined in the following claims.

What is claimed is:

1. A concentric conductor system including an inner conductor comprising two pieces of conducting material of substantially semi-circular section, with their flat sides abutting, and a. sheet of thin, flat dielectric material'located between and extending beyond. the flat sides of the-two sections of tubing, said elements being twisted together to form a spiral core, and a tubular outer conductor mounted upon the edges of. the spiral insulating element.

2. A concentric conductor system including an inner conductor comprising two pieces of conducting material of substantially semi-circular section, with their flat sides abutting, and a sheet of thin, flat dielectric material located between the flat sides of the two sections of tubing, said elements bein twisted together to form a spiral core, an a tubular outer conductor formed from a sheet of conductive material having its edges the spira 1y arranged core.

3. A: concentric conductor system includmg 7 an inner conductor comprising two pieces of conducting material of substantially semi-circular section, with their flat sides abutting, and a sheet of thin, flat dielectric material located between and ex tending beyond the flatsides of thetwo sections of tubing, said elements being twisted together to form .a spiral core, and an outerconductor comprising a sheet of conductive material wrapped about the spiral core and formed in the shape'of a tube surrounding the spiral core and mounted on the edges of the spiral dielectric sheet.

4. 'A concentric conductor system including .an inner conductor comprising two pieces of conducting material of substantially semi-circular section, with their flat sides abutting, and a sheet of thin, flat dielectric material located between and extending beyond the flat sides of the two sections'of tubing, said elements being twisted together to form a spiral core, and a tubular -May 1930.

an independent circuit for low frequency transmission. I

5. A concentric conductor system including an inner conductor comprlslng two pieces of conduct-ing material of substan-.

tially semi-circular section, with their flat sides abutting, and a sheet of thin, flat dielectric 'material located between the flat sides of the two sections of'tubing, said elements being twisted together to form a spiral core, and a tubular outer conductor formed from a sheet of conductive material having its edges folded together and abutting each other over the spirally arranged core so as to be separated from the inner conductor by gaseous space, the two semicircular tubes being adapted to be connected in parallel to form the return for the outer tubular conductor at high frequencies and said semi-circular inner tubular conductors being adapted to be connected one as a return for the other to form an independent circuit for low frequencytransmission.

6. A concentric conductor system including an inner conductor comprising two pieces of conducting material of substantially semi-circular section, with their flat sides abutting, and a sheet of thin, fiat dielectric material located between and ex-' tending beyond the flat sides of the two sections of tubing, said elements being twisted together to form a spiral core, and an outer conductor comprising a sheet of conductive material wrapped about the spiral core and formed in the shape'of a tube surrounding the spiral core and mounted on the edges of the spiral dielectric sheet so as to be separated from the inner conductor by gaseous space, the two semicircular tubes being adapted to be connected in parallel to form the return for the outer tubular conductor at high frequencies and said semi-circular inner tubular conductors being adapted to be connected one as a return for the other to form an independent circuit .for low fre quency transmission.

In testimony whereof, I have signed my name to this specification this 16th day of ALLEN CARPE. In testimony whereof, I have signed my name to this specification this 19th day "of May, 1930. FRANK- A. LEIBE. 1

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