US3639860A - Delay line - Google Patents

Abstract

A delay line having outgoing and return conductors stranded together in a manner such that upon winding the stranded conductors about a core, two windings of the same conductor lie in abutting relation to each other, whereby to substantially increase the inductance of the line and to maximize the delay time for a minimum length of line.

Description

United States Patent Breitenbach [54] DELAY LINE [72] Inventor: Otto Breitenbach, Nurnberg, Germany [73] Assignee: Kabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft, Hannover, Germany [22] Filed: July 31, 1970 1211 Appl. No.: 59,872

[52] US. Cl ..333/29, 336/180, 336/186, 333/31 [51] Int. Cl. ..H03h 7/30 [58] Field oiSearch ..333/31,31 A,3l C, 29; 336/180, 186, 187, 188; 315/3.6

[56] References Cited N T D I 3T N 2,801,361 7/1957 Pierce..... ..333/31Ax 1 Feb.1,l972

2,834,909 5/1958 Beaver ..333/3l A X 1,972,319 9/1934 Rypinski ..333/29 X 2,178,653 11/1939 Slade ..333/29 X 3,421,119 1/1969 Zerkin ..333/29 Primary Examiner-Herman Karl Saalbach Assistant Examiner-Saxfield Chatmon, Jr. Attorney-Philip G. Hilbert [5 7] ABSTRACT A delay line having outgoing and return conductors stranded together in a manner such that upon winding the stranded conductors about a core, two windings of the same conductor lie in abutting relation to each other, whereby to substantially increase the inductance of the line and to maximize the delay time for a minimum length of line.

3 Claims, 1 Drawing Figure PATENTED FEB H972 INVENTOR. 0H0 Brei'l'enbach m, 5, Mar

ATTO RNEY DELAY LINE BACKGROUND OF THE INVENTION Delay lines, in general, serve to delay the transmission of electrical signals for given time periods. Delay lines find application in alltypes of electronic equipment as well as apparatus used in nuclear physics. Delays can be achieved which vary from a fraction of a microsecond to about microseconds or more. Within these limits desired delay times can be set by the use of specified lengths of delay line suitably calibrated. It is desirable that delay lines be made which have the largest possible inductance so as to keep the line as short as possible for a given delay time.

There are known delay lines of the type wherein the outgoing and return conductors are wound in bifilar fashion, i.e., where for each turn there is always an outgoing and return conductor lying next to each other. Such delay lines are readily produced by known manufacturing procedures; however such lines exhibit certain disadvantages of an electrical nature.

Particularly, such known delay lines have relatively short delay times due to the small inductance of this type of line construction; and in many applications, produces too small a characteristic impedance.

Also, there is known a'delay line in which the outgoing and return conductors are wound about a common core with an opposite direction of lay. Such a line doesexhibit a large inductance and is always formed symmetrically. However, the line cannot be produced on conventional machines and special'winding equipment is required.

Accordingly, an object of this invention is to provide an improved delay line showing maximized delay times for minimum length of line.

Another object of this invention is to provide a delay line of the character described, having a construction which produces increased inductance, yet may be formedon conventional equipment.

Still another object of this invention is to provide a delay line of the character described which allows the use of reduced lengths of line for a given delay time, as compared to the length of line of conventional character required for the same delay time; such delay lines being readily produced with reduced fabricating costs.

Other objects of this invention will in part be obvious, and in part hereinafter pointed out.

DESCRIPTION OF THE DRAWING The single FIGURE is a side elevational view, showing a delay line embodying the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in the drawing, 10 designates a delay line embodying the invention. The same comprises the usual core 11, well known in the art. The line 10 further includes an outgoing conductor 12 and a return conductor 13; which conductors are previously stranded together by known equipment. The stranding operation involving conductors l2, 13 is of a character such that a selected uniform length of lay is assured.

The length of lay of the stranded conductors 12, 13 is within limits such that when the same are wound on core 11, two turns of each conductor will be disposed in side-by-side relation. Thus, two conductors portions 12A, 12B of conductor 12 will be in side by side abutting relation, alternating with two conductor portions 13A, 13B of conductor 13, also in side-byside abutting relation.

The length of lay of stranded conductors l2, 13 should correspond to the mean winding circumference u and should lie between the limits of about 1.6 u and about 2.4 u. Thus, it will be seen that in such case, the conductors are helically disposed about core 11, lying flat next to each other on one side of line 10, while they cross each other on the other side thereof.

However, with a length of lay corresponding to 2 u, the position of the cross conductors will always be on the same side. Such a line would not be circular in cross section, and being asymetrical, would not have a pleasing appearance. Accordingly, within the limits stated, the length of lay of stranded conductors l2, 13, is preferably other than 2 u.

With delay lines embodying the instant invention, it has been found that delay times may be maximized with minimum lengths of line; such lines showing large inductance values.

lclaim:

l. A delay line comprising a core, a winding on said core, said winding comprising a pair of insulated conductors prestranded together with a predetermined length of lay, the length of lay being of an order to locate two turns of each condoctor in side-by-side, parallel relation to each other, the paired turns of one conductor alternating with the paired turns of the other conductor.

2. A delay line as in claim 1, wherein the length of lay of the stranded conductors is about twice the winding circumference of the stranded conductors.

3. A delay line as in claim 3, wherein the length of lay of the stranded conductors is from about 1.6 to about 2.4 times said winding circumference.

Claims (3)

1. A delay line comprising a core, a winding on said core, said winding comprising a pair of insulated conductors prestranded together with a predetermined length of lay, the length of lay being of an order to locate two turns of each conductor in sideby-side, parallel relation to each other, the paired turns of one conductor alternating with the paired turns of the other conductor.

2. A delay line as in claim 1, wherein the length of lay of the stranded conductors is about twice the winding circumference of the stranded conductors.

3. A delay line as in claim 3, wherein the length of lay of the stranded conductors is from about 1.6 to about 2.4 times said winding circumference.

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