US3609600A - Distributed parameters delay line,on folded support - Google Patents

Distributed parameters delay line,on folded support Download PDF

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Publication number
US3609600A
US3609600A US779428A US3609600DA US3609600A US 3609600 A US3609600 A US 3609600A US 779428 A US779428 A US 779428A US 3609600D A US3609600D A US 3609600DA US 3609600 A US3609600 A US 3609600A
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Prior art keywords
substrate
delay line
conductor
regions
coil
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US779428A
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English (en)
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Georges Kassabgi
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General Electric Information Systems SpA
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General Electric Information Systems SpA
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/30—Time-delay networks
    • H03H7/34—Time-delay networks with lumped and distributed reactance

Definitions

  • the present invention relates to distributed parameter delay lines.
  • the present application discloses an electromagnetic distributed parameter delay line formed with continuous conductors, requiring neither soldered nor pressure connections between elements. This is obtained through the use of well known printed circuit techniques, to provide conductive patterns on one or both sides of a dielectric substrate.
  • One type of delay line comprises a first and a second thin flat insulating substrate of foldable material.
  • a continuous conductor of suitable shape is provided on one side of the first substrate and conductive interconnected areas are provided on one side of the second substrate.
  • Both substrates are placed in contact with one another, the side of the first support carrying the continuous conductor being in contact with the side of the second substrate not carrying the conductive areas.
  • Both substrates are folded along predisposed suitable folding lines in a manner such that, when folded, the continuous conductor on the first support forms a substantially helicoidal winding, therefore exhibiting a well defined inductance, the conductive areas of the second substrate being interleaved between the single turns of the said helicoidal winding.
  • the capacity between these conductive areas which are connected to ground, or any suitable reference voltage, and the winding, provides the distributed capacity of the line.
  • the delay lines comprise a single insulating foldable thin substrate, carrying a continuous conductor on one side and properly shaped conductive regions on the opposite side.
  • the continuous conductor forms a helicoidal winding, the conductive regions of the opposite side of the substrate being interleaved between single turns and insulated therefrom.
  • FIG. 1 shows two insulating strips supporting suitably shaped conductive patterns.
  • FIG. 2 shows the insulating strip of FIG. 1 when folded and interleaved.
  • FIG. 3 shows the final appearance of a delay line built according to the invention.
  • FIG. 4 and 5 represents two suitable shapes of the continuous conductor.
  • FIGS. 6, 7, 8 and 9 show alternative patterns of the conductive grounded areas.
  • FIG. 10 represents a delay line provided with intermediate taps.
  • FIG. 11 is an exploded view of a delay line provided with adjustable delay feature.
  • FIG. 12 shows the pattern of continuous. conductors which are part of an assembly of series connected delay lines.
  • FIG. 15 shows the final aspect of the corresponding assembly.
  • FIGS. 18 and 19 show the folded line of FIG. 16 and 17 as viewed from two different directions.
  • FIG. 20 shows a possible pattern of a continuous conductor on a strip having double width.
  • FIG. 21 shows the manner of folding said strip to obtain a winding.
  • a delay line constructed according to the invention is formed by assembling two continuous insulating strips, 1 and 2, made from thin dielectric and easily foldable material subject to low dielectric losses, such as, for example, polytetrafluoroethylene, more commonly identified by the trade name Teflon or other suitable similar material.
  • the thickness of the support may be 50 microns.
  • Each one of these strips may be considered as divided in adjacent regions, alternately identified by reference letters a and 11. These regions are bounded by the edges of the strips and by folding lines, perpendicular to the edges, alternately identified by reference letters c and d. g
  • a plurality of grounded areas 6 is obtained in the same manner on one side of strip 2. These grounded areas may, for example,
  • conductive areas 6 are connected together by rectilinear stretches 7 of the conductor, traversing regions b.
  • strips 1 and 2 are alternately folded in an opposite sense along lines 0 and a, and the folds are interleaved as shown in FIG. 2.
  • the curved segments 4 and 5 of the conductor 3 then form a complete turn, but are insulated from one another, except for the stretch traversing lines d, by the double thickness of the folded insulating substrate 1, whereas the insulation between consecutive turns is provided by the double thickness of the folded interposed insulating substrate 2.
  • the turns are serially connected by lengths of conductor traversing lines 0. Grounded areas 6 are therefore interleaved between consecutive turns, being insulated therefrom by the thickness of the substrate 2.
  • a delay line is thus obtained, having a substantially helicoidal winding showing a well defined inductance, and a distributed capacity toward ground, or any suitable reference voltage.
  • FIG. 3 shows a final version of the delay line, when contained in a suitable casing, and provided with two terminal pins 8 and 9, connected to the ends of the continuous conductor, and a ground pin 10, connected to the grounded areas.
  • the shape of the curved segments which form the turns of the winding may be different, being controlled by different conditions and requirements.
  • FIG. 4 shows how to obtain square turns, different from the one illustrated by FIG. 1, and
  • FIG. 5 shows a suitable shape of the continuous conductor 5 for obtaining circular turns.
  • the grounded areas may be differently shaped. They may occupy regions a only, either as a comblike pattern as shown in FIG. I, or by shapes similar to the shape of the turns they face, as shown in FIG. 6 for circular turns, and in FIG. 7 for square turns. They may also occupy opposite halves of regions a and b alternately, in a manner such that when the strips are folded and interleaved, the resulting grounded areas have a shape similar to the one of the facing turns, as shown in FIG. 8, wherein the dotted lines in region a indicate the position occupied by the conductive areas of region b, when the strip is folded. In the design of such areas care must be taken that, when folded, closed loops are not formed.
  • the grounded areas are obtained by means of a continuous conductor which forms open turns serially connected but wound alternately in opposite sense, when the strip is folded along the dotted lines, so that a noninductive winding results.
  • the portions of the conductor indicated by reference letter m in FIG. 9 must be separated by a small distance from the center line of the strip.
  • U.S. Pat. No., 3,543,l94 it may be convenient for the grounded regions not to completely shield consecutive turns,
  • a delay line constructed as described, having a volume of 1 cubic centimeter, may exhibit a delay time ranging from approximately to nanoseconds, and having a maximum operating frequency of about 60-80 MI-Iz.
  • FIG. 11 shows a screw 13 of insulating material, provided with a square head 14 and a threaded stem 15, inserted in a central aperture traversing the folded line. An insulating plate is superposed on the line, and a threaded nut 18 is screwed onto the stem 15, thus subjecting the line to an adjustable compression. As a consequence, the distance between winding turns is changed slightly and the capacitive coupling between turns and grounded areas changes correspondingly.
  • FIGS. 12 and 13 show the manner for obtaining an assembly of delay lines, to obtain a total delay time which is a multiple of the elementary line, without reducing the maximum operating frequency. As is known, this may be obtained by serially connecting elementary delay lines which are not inductively coupled together.
  • FIG. 12 shows a preferred form of continuous conductor pattern 19, located on a face of the insulating foldable substrate 20, of a width, as to contain several elementary strips like the strip of FIG. 1.
  • a plurality of windings, series connected, and placed side by side are obtained by folding the substrate alternately in opposite sense along lines I and f.
  • a folded substrate, carrying a corresponding plurality of grounded areas, is then interleaved between the folds of the first substrate.
  • FIG. 13 shows the folded multiple delay line.
  • Reference number 21 indicates the continuous conductor forming the turns of the windings.
  • Reference number 22 indicates the grounded areas, partially cut away to show the underlying turns.
  • cylindrical cores 25 of ferromagnetic low loss material may be inserted into said bores, thus increasing the inductance of the line and the delay time, which may reach about ten microseconds, or more.
  • a modified form of the invention makes use of a single insulating strip, having on one face the continuous conductor originating the winding, and on the other the grounded areas.
  • FIG. 16 represents side 26 of an insulated strip, which supports the continuous conductor 27 forming the winding.
  • the strip is divided into regions a and b by folding lines c and :1. Folding the uppermost region a over the following region b, a rectangular turn is formed as shown by the dotted lines drawn on region b. This turn is open, due to the fact that a small gap z exists between the terminal points 27 and 28 of the turn.
  • the terminal point 28 is connected to the point 29 of the next turn by a short stretch of conductor crossing the folding line d.
  • the terminal point 30 of this turn is shifted to the right by a small quantity with respect to point 29, to provide the small gap 2 between terminal points of the turn.
  • FIG. 17 shows a preferred shape of the grounded areas located on the opposite face of the same insulating strip, as viewed through the substrate.
  • the relative positions of the continuous conductor 27 and of the grounded areas may be realized by superimposing FIG. 16 upon FIG. 17 by means of a parallel translation.
  • FIG. 18 and FIG. 19 are two views, from different directions, of a delay line obtained by folding the described strip. The delay line is represented partially unfolded in order to show the conductor and the areas on regions a and b.
  • FIG. 20 shows an embodiment wherein the continuous conductor is carried on a double width strip. Every single turn is obtained by first folding the strip along the central line X-X, and then along the transverse folding lines, as shown in FIG. 21.
  • the stretches of the continuous conductor, which cross the central line are suitable shifted in the downward direction in order to avoid contact between them.
  • the same effect, of avoiding the contact between connecting stretches of conductor across the folding lines may be attained by using folding lines alternately inclined first in one direction and then in the other with respect to the edges of the strip.
  • each of the turns obtained by folding the substrate are rotated a definite degree with respect to the adjacent ones, so that the connecting lengths are shifted and do not come in contact with one another, as shown in FIG. 25.
  • FIG. 23 and FIG. 24 Other alternate forms based on the same idea are shown in FIG. 23 and FIG. 24, in which the oblique folding lines result in triangular regions. Each one of these regions contains a one-third part of a complete turn. windings having triangular or circular turns may be obtained, according to the shape of the continuous conductor, by alternately-folding the strip in opposite direction along the oblique folding lines. (FIG. 26 and 27). The resulting assembly has the shape of a triangular prism. The connections traversing the folding lines are reciprocally insulated.
  • the described technique may be used for fabricating inductors, if no grounded areas are provided, or for fabricating transformers, by juxtaposing and interleaving two or more windings and providing no grounded areas.
  • An electromagnetic delay line comprising:
  • said substrate being folded in alternate directions relative to the plane thereof along lines transverse to and spaced apart along the length of said substrate, said conductor forming a respective segment of the turn of a coil in each one of a set of successive regions along said substrate, each of said regions comprising the portions of said substrate between adjacent ones of said transverse lines, wherein all of said segments in each one of said sets form a complete coil turn, wherein all of said segments of said substrate form a multiturn coil,
  • said means for adjusting the spacing between regions comprising an aperture through each region of said substrate, a tensioning member including a threaded portion at one extremity thereof extending through said aperture and having the other extremity thereof in pressure contact with one end of the folded assembly and threaded means riding on said threaded portion of said tensioning member for adjusting the tension between the ends of the folded assembly.
  • An electromagnetic delay line comprising:
  • said substrate being folded in alternate direction relative to the plane thereof along lines transverse to and spaced apart along the length of said substrate, said conductor forming a respective segment of the turn of a coil in each one of a set of successive regions along said substrate, each of said regions comprising the portion of said substrate between adjacent ones of said transverse lines, wherein all of said segments 'in each one of said sets form a complete coil turn, wherein all of said segments of said substrate form a multiturn coil, 5
  • a third terminal connected to said plurality of conductive areas.
  • An electromagnetic delay line as defined in claim 4 said means for adjusting the spacing between regions comprising an aperture through each region of said substrate, a tensioning member including a threaded portion at one extremity thereof extending through said aperture and having the other extremity thereof in pressure contact with one end of the folded assembly and threaded means riding on said threaded portion of said tensioning member for ad usting the tension between the ends of the said fan-fold assembly.
  • said substrate being adapted to be folded in alternate directions relative to the plane thereof along lines transverse to and spaced apart along the length of said substrate, said conductor forming a respective segment of the turn of a coil in each one of a set of successive regions along said substrate, each of said regions comprising the portion of said substrate between adjacent ones of said transverse lines, wherein all of said segments in each one of said sets form a complete coil turn, wherein all of said segments of said substrate form a multiturn coil, and
  • the electromagnetic delay line of claim 8 further including a first tenninal connected to one end of said conductor, a second terminal connected to the other end of said conductor, and means for connecting to said grounded areas.
  • An electromagnetic delay line as defined in claim 9 including means for adjusting the spacing between adjacent regions of said substrate.
  • An electromagnetic delay line comprising a nonconductive two-sided substrate, said substrate having a first repetitive plurality of conductive segments being serially connected forming a first continuous conductor on one side thereof and a second repetitive plurality of conductive areas being parallel connected forming a second continuous conductor on the other side thereof in predetermined relationship with said first conductor, said first and second conductors being insulated from one another by said substrate said substrate being plicated in accordionlike fashion along selected plication lines, whereby said first plurality forms a multiturn coil of serially connected turns having at least first and second terminals and said second plurality forms a set of parallel connected ground planes interleaved between said turns and insulated therefrom.

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US779428A 1967-11-27 1968-11-27 Distributed parameters delay line,on folded support Expired - Lifetime US3609600A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846721A (en) * 1973-08-08 1974-11-05 Amp Inc Transmission line balun
US3876964A (en) * 1973-08-23 1975-04-08 Amp Inc Flat flexible transmission cable
US3967222A (en) * 1975-05-27 1976-06-29 Trw Inc. Distributed resistance-capacitance component
US4045750A (en) * 1975-10-16 1977-08-30 Xerox Corporation Electrical cable and coupling arrangement
US4614925A (en) * 1983-07-05 1986-09-30 Matsushita Electric Industrial Co., Ltd. Resonator filters on dielectric substrates
US4695812A (en) * 1985-03-15 1987-09-22 Elmec Corporation Electromagnetic delay line with inductance element with transversely staggered stacked conducting portions
US5030931A (en) * 1988-05-16 1991-07-09 Thin Film Technology Corporation Folding delay line
US5495213A (en) * 1989-01-26 1996-02-27 Ikeda; Takeshi LC noise filter
US6204745B1 (en) * 1999-11-15 2001-03-20 International Power Devices, Inc. Continuous multi-turn coils
US6483713B2 (en) * 2001-11-20 2002-11-19 St. Jude Children's Research Hospital Multilayered board comprising folded flexible circuits
WO2003045121A1 (en) * 2001-11-20 2003-05-30 St. Jude Children's Research Hospital Multilayered board comprising folded flexible circuits and method of manufacture
US20070040627A1 (en) * 2005-03-30 2007-02-22 Matsushita Electric Industrial Co., Ltd. Transmission line pair and transmission line group
US20130305520A1 (en) * 2012-05-20 2013-11-21 Trevor Graham Niblock Batch Manufacturing Meso Devices on flexible substrates

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846721A (en) * 1973-08-08 1974-11-05 Amp Inc Transmission line balun
US3876964A (en) * 1973-08-23 1975-04-08 Amp Inc Flat flexible transmission cable
US3967222A (en) * 1975-05-27 1976-06-29 Trw Inc. Distributed resistance-capacitance component
US4045750A (en) * 1975-10-16 1977-08-30 Xerox Corporation Electrical cable and coupling arrangement
US4614925A (en) * 1983-07-05 1986-09-30 Matsushita Electric Industrial Co., Ltd. Resonator filters on dielectric substrates
US4695812A (en) * 1985-03-15 1987-09-22 Elmec Corporation Electromagnetic delay line with inductance element with transversely staggered stacked conducting portions
US5030931A (en) * 1988-05-16 1991-07-09 Thin Film Technology Corporation Folding delay line
US5495213A (en) * 1989-01-26 1996-02-27 Ikeda; Takeshi LC noise filter
US6204745B1 (en) * 1999-11-15 2001-03-20 International Power Devices, Inc. Continuous multi-turn coils
US6377157B1 (en) 1999-11-15 2002-04-23 International Power Devices, Inc. Continuous multi-turn coils
US6577220B2 (en) 1999-11-15 2003-06-10 Power-One, Inc. Continuous multi-turn coils
US6483713B2 (en) * 2001-11-20 2002-11-19 St. Jude Children's Research Hospital Multilayered board comprising folded flexible circuits
WO2003045121A1 (en) * 2001-11-20 2003-05-30 St. Jude Children's Research Hospital Multilayered board comprising folded flexible circuits and method of manufacture
US20070040627A1 (en) * 2005-03-30 2007-02-22 Matsushita Electric Industrial Co., Ltd. Transmission line pair and transmission line group
US20070040634A1 (en) * 2005-03-30 2007-02-22 Matsushita Electric Industrial Co., Ltd. Transmission line
US7369020B2 (en) * 2005-03-30 2008-05-06 Matsushita Electric Industrial Co., Ltd. Transmission line comprising a plurality of serially connected rotational direction-reversal structures
US7518462B2 (en) 2005-03-30 2009-04-14 Panasonic Corporation Transmission line pair having a plurality of rotational-direction reversal structures
US20130305520A1 (en) * 2012-05-20 2013-11-21 Trevor Graham Niblock Batch Manufacturing Meso Devices on flexible substrates

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FR1604653A (enrdf_load_stackoverflow) 1972-01-03

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