US2251530A

US2251530A - Support for high frequency concentric conductors

Info

Publication number: US2251530A
Application number: US324892A
Authority: US
Inventors: Thorne Earle Dayton
Original assignee: RCA Corp
Current assignee: RCA Corp
Priority date: 1940-03-19
Filing date: 1940-03-19
Publication date: 1941-08-05
Anticipated expiration: 1958-08-05

Description

Aug. 5, 1941.

E. D. THORNE SUPPORT FOR HIGH FREQUENCY CONCENTRIC CONDUCTORS Original Filed March 11, 1937 I IIll,III/IIII'IIIII/I/IIIIIIIIIIIIIIlII/J 4 Sheets-Sheet l L INVENTOR E. DAYTON THORNE BY g ATTORNEY Aug. 5 19410 E. D. THORNE SUPPORT FOR HIGH FREQUENCY GONCENTRIC CO NDUCTORS Origina; Filed March 11, 1937 4 Sheets-Sheet 2 more: P/JRT EXTEND/N6 4301 5 TWIN C0/V0l/6'TOR BECOMSi/ ANTENNA 0/? RADIATOR TRANSMITTER TRANSMITTER 0R kEC'E/VER 0A RECEIVER INVENTOR EgWTON THORNE Aug. 5, 1941. E. D. THORNE H FREQUENCY CONCENTRIC CONDUCTORS SUPPORT FOR HIG m 3 m H t T N w N a h EN 0 6 Wm H m M A w 0 & E 4

Original Filed March Aug. 5, 1941. E. D. THORNE 2,251,530 SUPPORT FOR HIGH FREQUENCY CONCENTRIC CONDUCTOR-S Ori inal Filed March 11, 1957 4 Sheets-Sheet 4 I NVEN TOR ATTORNEY 5.0 YTON THORNE BY ag 5 m D m ill mmmwmwmmmmmmmmmHmmm m a m n a 4 i J .y i I 5 I a.

Patented Aug. 5, 1941 SUPPORT FOR. HIGH FREQUENCY CONCEN- TRIC CONDUCTORS Earle Dayton Thorne Patchogue, N. Y., assignor to Radio Corporation of America, a corporation of Delaware Continuation of application Serial No. 130,243, March 11, 1937. This application March 19, 1940, Serial No. 324,892

20 Claims.

amount of spacing or supporting solid dielectric material in the high frequency field of a concentric conductor or transmission line system.

Another object'of this invention is to provide a substantially insulating point contact supporting system employing a plurality of rod-like spacing members.

Still another object of this invention is to provide adjustable insulating apparatus to enable accurate external control of conductor spacing of concentric transmission lines used for high frequency currents.

A further object of this invention is to improve the circuit arrangement of concentric conductors in combination with spacing and supporting members of this invention.

An advantage of this invention resides in the fact that the spacing means for the tubes or conductors are adjustable, that no metal projects into the high frequency field, and that the formation of corona, arcovers, etc., is reduced or prevented. The reduction of solid dielectric material in the high frequency field reduces dielectric losses. Furthermore, the insulators of this invention can be easily inspected and replaced, if necessary.

Another advantage of this novel type of support for concentric tubes is that it may be used to hold a first tube or conductor concentric to another tube, or second tube, and that these two tubes may then be located concentrically with respect to a third tube, this arrangement providing two separate high frequency paths, the intermediate tube being in general the common conductor for both separate paths.

The invention will be more clearly understood by referring to the accompanying drawings, in

which:

Fig. 1 is a cross-section of a concentric conductor, showing the insulating means of this invention;

Fig. 2 is a detail cross-section, showing the improved insulator of this invention, partly in section and partly in elevation;

Fig. 3 is a longitudinal section of a concentric conductor having internal rod-like insulating members, the section being taken on the line 33 of Fig. 4, which is a cross-sectional view of Fi 3;

Fig. 5 is a longitudinal section of a triple concentric conductor arrangement, the section being taken on line 55 of Fig. 6, which is a crosssectional view of Fig. 5;

Fig. 7 is a longitudinal section of a quadruple concentric arrangement, the section being taken on line 'i| of Fig. 8, which is a cross-section of Fig. '7;

Fig. 9 is a diagram of a circuit arrangement, employing twin conductors of those shown by Figs. 1 to 4, inclusive;

Fig. 10 is a diagram of a circuit, employing a combination of twin and triple conductors, shown in Figs 1 to 6, inclusive;

Fig. ,11 is a side elevation partly in section of an arrangement wherein a single concentric conductor is connected to a push-pull coupling arrangement;

Fig. 12 is an end view of Fig. 11, a portion of which is shown in section;

Fig. 12a is a plan view of Fig. 12; s

Fig. 13 is a schematic diagram of a concentric conductor arrangement in which the proportional dimensions are given in terms of wave lengths;

Fig. 14 is a side elevation of a conductor employed in a coupling filter;

Fig. 15 is a front elevation'of Fig. 14; and

Fig. 16 is a top view of Fig. 14.

Referring now in detail to Figs. 1 and 2 of the drawings, the outer conductor i is provided with a plurality of assembly groups of raised threaded members 2 which in this embodiment are equally spaced apart, although any number of insulators may be used,'such as four, five, six, etc. The assembly groups of raised members are placed at suitable intervals longitudinally along the outer conductor. Member 2 is internally threaded and secured to member i by any suitable means, such as machine screws 3, or itv may be secured by other means, such as welding, soldering, riveting, or the like.

Within the threaded portion of member 2 there is provided a hollow stud 4 in which an insulating rod 5 is rigidly held by means of a machine screw 6, the ends I of insulating member 5 being rounded over so as to present a substantial point contact on inner tube 8. When the concentric conductor is placed in a location which is subject to repeated vibrations, the threaded member 4 may be securely locked in place by means of lock nut 9.

In the embodiment shown in Figs. 3 and 4,

the inner tube in is provided with three apertures which are the same size as the insulating rods ll. These apertures are located radially 120 apart, but not in line with each other longitudinally. Diametrically opposite each aperture is a smaller aperture for receiving a small fiat or oval headed machine screw i2 which is threaded into the end of insulating rod H. In order that adjustment may be provided for different diameters of the outer conductor l3, a spacer i4 is provided, all adjustments being altered by using dilferent thicknesses of spacers.

The embodiment shown in Figs. 5 and 6 is similar to that of Figs. 3 and 4, except that there is added three or more assemblies as shown in Figs. 1 and 2 secured to the outside of tube 15 for concentrically spacing tube 13 and parts I l and i k-as shown, in Figs. 3, 4, 5 and 6, for concentrically spacing tube 13 from tube l3.

Figs. 7 and 8 illustrate a further embodiment of this invention wherein four conductors are concentrically arranged. The two innermost conductors i8 and ii are spaced apart in a manner similar to conductors of It) and 13 of Figs. 5 and 6, by members H and H. The two outermost conductors i8 and 19 are spaced apart by an adjustable arrangement similar to that illustrated in Figs. 1 and 2, that is, the conductor i8 is concentrically arranged within conductor it by means of insulating rods 5 and members '3, i and 9; member 59 is also provided with an additional group of

members

2, and 3 which supports an additional long insulating member 2% for securing conductors i6, I l and 19 in concentric relationship.

Fig. 9 illustrates a simple circuit arrangement employing the support and spacing members of this invention for coupling an antenna 2i to transmitting or receiving apparatus 22.

Fig. 10 illustrates an improved circuit arrangement in which a twin conductor is combined with a triple conductor for coupling an antenna M to receiver or transmitting apparatus 22, the specific features of the triple conductor being illustrated in detail in Figs. 5 and 6 and the twin conductor in Figs. 1 to 4, inclusive.

While Figs. 9 and 10 show but two specific applications of the improved adjustable supporting members of this invention, these supporting insulators may also be used in long lines for frequency control when concentric conductors are employed. They may also be used for a push-pull coupling arrangement, as shown in Figs. 11, 12 and 12a, in which a twin conductor line comprising an outer conductor 23 and an inner conductor 24 changes to a triple line by means of the addition of a tapered or triple conductor 25, all three of which terminate within a junction box 26 at which point the line then changes to two twin lines comprising inner conductors 2! and outer conductors 28, the outer conductors being spaced apart by means of a bridge-like arrangement 29. The constructional details of the insulating spacing members have been previously illustrated in Figs. 1, 2, 7 and 8 and comprise the short insulating spacing members 5, long insulating spacing members 29, threaded member 2, look nut 9 and hollow stud Li Fig. 13 shows a schematic diagram of a crosscoupling filter particularly adapted to a television transmitter, in which the proportionate relationship of wave-lengths and their dimensions are given for a transmitter operating at a video frequency of 49.75 megacycles and a voice frequency of 52 inegacycles, the video( \l) frequency being connected at a point 30 and the voice (A2) frequency being connected at a point 3!. These are then combined and terminate in an antenna connection which is taken off at a point 32. The actual structural arrangement of this cross-coupling filter is shown in detail in Figs. 14, 15 and 16, the conductors being spaced apart by means of the insulating supporting members 5 and associated elements, shown in detail in Figs. 1 and 2.

In such a television circuit as mentioned above, it is desirable to be able to adjust the space relationship between the several conductors to obtain the desired electrical characteristics; this is readily accomplished by the use of simple tools, such as a screw driver for turning member 4 and a wrench for locking member 4 when the desired spacing is obtained.

The concentric conductors of Figs. 1, 2, 3 and 4 are also used for high frequency currents and circuit arrangements, as shown, for example, in a Lindenblad Patent #2,131,108, patented Sept. 27, 1938 (Fig. 12); in a Garter Patent #2,l28,400, patented Aug. 30, 1938 (Fig. 5); in a Conklin et al. Patent #2,103,515, patented Dec. 28, 1937; and in a Kroger Patent #2,].U8,895, patented Feb. 22, 1938, respectively, and the apparatus of Figs. 5 and 6 may be used in systems as described in a Tunick application, filed June 15, 1936, Ser. 'No. 26,749, now Patent #2,l69,305, dated Aug. 15, 1939.

While only a few modifications of this in vention are shown. it is to be distinctly understood that it is not to be limited to those shown but is capable of taking other forms and shapes within the spirit and scope thereof.

What is claimed is:

l. A high frequency apparatus comprising an outer conductor having a plurality of apertures therein, an inner conductor arranged within said outer conductor, a plurality of supports for adjusting and locating said inner conductor, each of said supports having a raised boss portion, each support located at an aperture on the outside of said outer conductor and spaced apart from the other supports, a hollow stud located within said bos portion, and an insulating member secured to said hollow stud and arranged to extend inwardly through an aperture in the wall of said outer conductor to contact the outside wall of said inner conductor.

2. A high frequency apparatus comprising an outer conductor having a plurality of apertures therem, an inner conductor arranged within said outer conductor, a plurality of supports for adusting and locating said inner conductor, each of said supports having a raised boss portion having internal threads, each support located at an aperture on the outside of said outer conductor and spaced apart from the other supports, a hollow threaded studlocated within said boss portion, and an insulating member secured to said hollow stud and arranged to extend inwardly through an aperture in the wall of said outer conductor to contact the outside wall of said inner conductor.

3. A high frequency apparatus comprising an outer conductor, having a plurality of apertures therein, an inner conductor arranged within said outer conductor, a plurality of supports for adusting and locating said inner conductors, each of said supports having a raised boss portion, each support located at an aperture and spaced end opposite said rounded portion to said hollow stud and arranged to extend inwardly through an aperture 'in the wall of said outer conductor to contact the outside wall of said inner conductor by said rounded portion.

4. A high frequency apparatus comprising an outer conductor having a plurality of apertures therein, an inner conductor within said outer conductor, a plurality of supports for adjusting and locating said inner conductor, each of said supports having a raised boss portion, each support located at an aperture on the outside of the outer conductor and spaced apart from the other supports, a threaded hollow stud located within said boss portion, the upper portion of said threaded hollow stud being slotted to permit adjustment thereof, and an insulating meny, ber secured to said hollow stud and arranged to extend inwardly through an aperture in the wall of said outer conductor to contact the outside wall of said inner conductor.

5. In a television circuit comprising a plurality of concentric tubular electrical conductors some of which have apertures therein, means for supporting said conductors from one another and for adjusting the space relationship between them to obtain desired electrical characteristics of said television circuit, said means comprising a plurality of insulated members each one of which passes through an aperture and is supported by the wall of the outermost conductor to bear against the wall of an inner conductor, and at least one of the inner conductors extending beyond said outermost conductor.

6. In a high frequency conductive system, an outer conductor having a plurality of apertures therein, an inner conductor arranged within said outer conductor, a pluraility of supports for said inner conductor, each of said supports having a raised boss portion, said boss portion being located at an aperture on the outside of said outer conductor and spaced apart from one another, a

, hollow stud located within each boss portion,

and an insulating member secured to said hollow stud to extend inwardly through an aperture in the wall of said outer conductor to contact the outer surface of said inner conductor.

7. In a high frequency conductive system, an outer conductor having a plurality of apertures therein, an inner conductor arranged within said outer conductor, a plurality of supports for said inner conductor, each of said supports having a raised internally threaded boss portion, said boss portion being located at an aperture on the outside of said outer conductor and spaced apart from one another, a hollowthreaded stud located within each boss portion, and an insulating member secured to said hollow stud to extend inwardly through an aperture in the wall of said outer conductor to contact the outer surface of said inner conductor.

8. In a high frequency conductive system, an outer conductor having a plurality of apertures therein, an inner conductor arranged within said outer conductor, a plurality of supports for said inner conductor, each of said supports having a raised boss portion, said boss portion being located at an aperture on the outside of said outer conductor and equally spaced from one another, a hollow stud located within each boss portion, and an insulating rod having a rounded end portion associated with each stud, said insulating rod being secured by an end opposite said rounded portion to said hollow stud to extend inwardly through an aperture in the wall of said outer conductor to contact the outer surface of said inner conductor by said rounded portion.

9. In a high frequency conductive system, an outer conductor having apertures therein, an inner conductor arranged within said outer conductor, a plurality of supports for said inner conductor, each of said supports having internal threads and a raised boss portion, said boss portion being located at an aperture on the outside of said outer conductor and spaced apart from one another, a threaded hollow stud located within each boss portion, the upper portion of said threaded hollow stud being slotted to permit adjustment thereof, and an insulating member secured to each hollow stud to extend inwardly through an aperture in the wall of said outer conductor to contact the outer surface 01' said inner conductor.

10. High frequency apparatus comprising three coaxial conductors, means for spacing said conductors apart, said means comprising a plurality of insulating support members some of which are secured to the innermost conductor to support the intermediate conductor in concentric relationship with the inner conductor, and a plurality of insulating supports for suitably spacing said intermediate conductor from said outer conductor, each of said last supports having a raised boss portion, said support being located at an aperture on the outside of said outer conductor and spaced apart from one another, a hollow stud located within each boss portion, and an insulating member secured to each hollow stud to extend inwardly through the 9 wall of said outer conductor to contact the outer surface of said intermediate conductor.

11. A high frequency apparatus comprising four coaxial conductors, means for spacing said conductors apart, said means comprising a plurality of insulating support members some of which are secured to the innermost and some secured to the outermost conductors to support the two intermediate conductors in cencentric relationship with the two other conductors, and a plurality of supports for suitably spacing the two intermediate conductors within said outer conductor, each of said supports having a raised boss portion, said boss portions being located on the outside: of said outer conductor and spaced apart from one another, a hollow stud located within each boss portion, and an insulating member secured to each hollow stud to extend inwardly through an aperture in the wall of said outer conductor to contact the wall of one of said intermediate conductors.

12. High frequency apparatus comprising two coaxial conductor systems each having an inner and an outer conductor, means for electrically coupling correspondingly arranged conductors of said two systems together, means for supporting and spacing the two conductors of each coaxial system apart from each other, said means comprising a plurality of spaced insulating supports, each of said supports having a raised boss portion on the outside of the outer conductor, a hollow stud located within each boss portion, an insulating member secured to each hollow stud and passing inwardly through an aperture in the wall of the associated outer conductor and also extending outwardly therefrom, and adiustable means located on the outer conductor and operatively associated with said member for adjusting the effective length of said insulating member to provide adjustable spacing of said conductors.

13. In a conductive system fpr the communication of intelligence, two concentric conductors, means for supporting the inner of said conductors from the outer, including a plurality of spaced insulator rods extending from the outer surface of the inner conductor through apertures in the wall oi the Outer conductor and including elements mounted on. the outer surface of said outer conductor and individual to each rod for securing each of said insulator rods thereto and means for adjusting the lengths of said rods appearing between said conductors.

14. In a conductive system for the communication of intelligence, two concentric conductors, means for supporting the inner of said conductors from the outer, including a plurality of spaced insulator rods extending from the outer surface of the inner conductor through apertures in the wall of the outer conductor and including elements mounted on the outer surface of said outer conductor and individual to each rod for securing each of said insulator rods thereto and means for adjusting the lengths of said rods appearing between said conductors, at least one of said elements mounted on the outer surface of said outer conductor being made of metal, said metal element being entirely outside the high frequency field of said conductive system.

15. High frequency apparatus comprising three conductors coaxially arranged, the inner and outer conductors having a plurality of aperturestherein, means for spacing said conductors apart, said means comprising a plurality of insulating support members secured to the inner conductor and each support member passing through an aperture therein to support the intermediate conductor in concentric relationship with the inner conductor, and a plurality of supports for adjusting and locating said intermediate conductor within said outer conductor, each of said supports having a raised boss portion, each support located at an aperture on the outside of said outer conductor and spaced apart from the other supports, a hollow stud located and arranged within said boss portion, and an insulating member secured to said hollow stud and arranged to extend inwardly through an aperture in the wall of said outer conductor to contact the outside wall of said intermediate conductor.

16. A high frequency apparatus comprising four conductors coaxially arranged, means for spacing said conductors apart, said means comprising a plurality of insulating support members secured to and passing through apertures in the inner and outer conductors to support the two intermediate conductors in concentric relationship with the two other conductors, and a plurality of supperts for adjusting and locating the two intermediate conductors within said outer conductor, each of said supports having a raised boss portion, each support located at an aperture and spaced apart from each other on the outside or said outer conductor, a hollow stud located within a boss portion, some of said insulating members being secured to said hollow studs to extend inwardly through apertures in the wall of said outer conductor to contact the outside wall of one of said intermediate conductors.

17. A high frequency apparatus comprising a plurality of tubular electrical conductors each one of which is coaxially arranged with respect to another conductor, means supporting some of said conductors in proper space relationship between adjacent conductors to obtain desired electrical characteristics of said high frequency apparatus, said means comprising a plurality of insulating members, each one of said insulating members being arranged to pass through an aperture in the inner conductor and secured to the inside wall of said inner conductor at a point diametrically opposite said aperture, said insulating member projecting beyond the aperture in said inner conductor and bearing against the inside wall of the outer conductor.

18. A high frequency conductive apparatus comprising a pair of concentric tubular electrical conductors, the outermost of said conductors having apertures therein, means for supporting the inner conductor and for adjusting the space relationship between said conductors to obtain desired electrical characteristics of said high Irequency apparatus, said means comprising a plurality of insulated members, a supporting device for each insulated member on the wall of the outermost conductor, said supporting device having adjusting means for said insulated member whereby each one of said insulated members .travels through an aperture and bears against the wall of the inner conductor.

19. A high frequency apparatus according to claim 1 wherein the inner conductor serves as an antenna by extending beyond the outermost conductor.

20. High frequency apparatus comprising an inner and an outer tubular conductor which terminates by an insertion of an intermediate tubular conductor into at least three conductors, a junction box for said conductors, means for spacing said conductors apart, said means comprising a plurality of insulating members secured to said outer conductor and extending inwardly through apertures in the walls of some of said conductors and adjacent said junction box in which at least two separate twin conductors are electrically coupled together, and adjusting means located outside said outer conductor to adjustably alter the eifective length of said insulating members, said adjusting means comprising support members each having a raised boss portion each support member located at an aperture on the outside of said outer conductor and spaced apart from the other support members, a hollow stud located within each boss portion, and an insulating member secured to each hollow stud.to extend inwardly through an aperture in the wall of said outer conductor to contact the outer surface of one of said inner conductors.

EARLE DAYTON THORNE.