WO2003059025A2 - Ligne de retard de disque monolithique et procede de fabrication correspondant - Google Patents

Ligne de retard de disque monolithique et procede de fabrication correspondant Download PDF

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Publication number
WO2003059025A2
WO2003059025A2 PCT/US2003/001240 US0301240W WO03059025A2 WO 2003059025 A2 WO2003059025 A2 WO 2003059025A2 US 0301240 W US0301240 W US 0301240W WO 03059025 A2 WO03059025 A2 WO 03059025A2
Authority
WO
WIPO (PCT)
Prior art keywords
strip
delay line
roll
stripline
ground
Prior art date
Application number
PCT/US2003/001240
Other languages
English (en)
Other versions
WO2003059025A3 (fr
Inventor
Joseph Mazzochette
Original Assignee
Lamina Ceramics, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lamina Ceramics, Inc. filed Critical Lamina Ceramics, Inc.
Priority to AU2003205162A priority Critical patent/AU2003205162A1/en
Priority to EP03703831A priority patent/EP1470742A4/fr
Publication of WO2003059025A2 publication Critical patent/WO2003059025A2/fr
Publication of WO2003059025A3 publication Critical patent/WO2003059025A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type

Definitions

  • This invention relates to transmission delay lines for guided electromagnetic waves (RF and microwave).
  • RF and microwave guided electromagnetic waves
  • This invention relates to delay lines in the form of a monolithic, compact discs and to methods for making such delay lines.
  • Delay lines are important components in many microwave and radio frequency (RF) circuits. They provide fixed delays and phase shifts that can perform a variety of signal processing functions. For example, delay lines are used in feed forward amplifiers to provide phase shifts effective to cancel large distortion products.
  • RF radio frequency
  • Typical transmission delay lines comprise lengths of coaxial cable or stripline transmission lines ("striplines").
  • coaxial cable delay lines are helically coiled and striplines are formed in a meandering configuration.
  • Coiled coaxial delay lines are reliable and low loss.
  • Meandered striplines are inexpensive and easy to construct and connect, but they have relatively high loss, and the many bends associated with their meandering paths create unwanted reflections and delay distortion. Accordingly there is a need for an improved compact delay lines.
  • a delay line comprises a spirally coiled strip transmission line encapsulated within conductive ground discs.
  • the delay line is a monolithic ceramic structure produced by forming the stripline on green ceramic tape, spirally rolling the green stripline, encasing the rolled stripline in green ceramic encapsulating discs and cofiring the green assembly into a monolithic compact disc.
  • Fig. 1 is a flow diagram of the steps of a preferred process for making a delay line
  • Fig. 2 shows a green stripline tape used in the process of Fig. 1;
  • Fig. 3 illustrates the green tape wound into a spiral roll
  • Fig. 4 is a schematic cross section of the encapsulated coil showing advantageous internal connection features.
  • Fig. 5 is a schematic longitudinal cross section of a multistripline roll
  • Fig. 6 is a schematic respective view of delay line having a doubled stripline
  • Fig. 7 is a cross section of the stripline used in Fig. 6.
  • Fig. 1 is a block diagram of the steps in an advantageous process for making a delay line.
  • the first step, shown in block A, is to provide a flexible stripline, preferably in the form of a green ceramic tape structure.
  • Fig. 2 illustrates an advantageous green ceramic stripline 20 in partial cross section.
  • the green stripline 20 comprises a green center conductive strip 21, a green ceramic insulating layer 22, a green ground conductive layer 23 and a second green ceramic insulating layer 24.
  • This green ceramic stripline can be conveniently fabricated by printing green center conductive layer 21 as conductive ink on a first green ceramic tape corresponding to layer 22 and printing green ground conductive layer 23 on a second green ceramic tape corresponding to layer 24.
  • the two tapes can be stacked and pressed to form the green stripline 20 of Fig. 2.
  • the end portions of the green stripline 20 can be adapted to facilitate electrical contacts by providing the center strip 21 with an extension 25 to the tape edge.
  • the second step shown in block B of Fig. 1 is to spirally wind the flexible stripline.
  • the stripline is wound around a central cylinder which conveniently can provide electrical contact with the center conductive strip 21.
  • Fig. 3 is an end view of the spirally wound roll 30 formed by winding the green ceramic stripline 20 around a central cylinder 31.
  • Cylinder 31 can be an extruded green ceramic rod coated with an appropriate pattern of conductive ink to achieve electrical contact 32 with center strip 21. The best electrical and mechanical performance is achieved if the tapes are rolled such that each center strip 21 is directly aligned over itself on subsequent layers of the roll.
  • the inside diameter of the roll (around cylinder 31) should be large enough to avoid cracking stripline 20.
  • the stripline 20 is wound or pressed with sufficient tightness that an isostatic lamination occurs, creating a single body with each layer of the roll adhering to the adjacent layer.
  • the third step, Block C of Fig. 1, is to apply conductive ground discs to the faces of the roll.
  • the discs include conductive material to contact the ground layer 23, preferably along its entire rolled length and on both the top and bottom faces.
  • Fig. 4 is a partial cross section of a roll 30 having an upper face 40 and a lower face 41.
  • Encapsulating discs 42 and 43 in the form of green ceramic discs, each having a conductive ink surface, are disposed on the faces 40, 41 respectfully, to encapsulate the faces and electrically contact the ground layers 23.
  • the discs may include one or more insulated via holes 44 to facilitate electrical contact with the center cylinder 31.
  • the discs 42, 43 are advantageously pressed onto the faces to laminate the disc onto the structure.
  • the assembly can be unitized (Fig. 1, Block D).
  • the assembly can be fired in a kiln to form an integral body. Firing melts the glass in the green ceramic and conductive inks. The glass cools when the assembly is removed from the firing kiln, fusing the entire structure together.
  • a plurality of spirally wound striplines 30 can be cut from a single roll.
  • the process of Fig. 1 is applied to layer ceramic tapes 22, 24 to form a roll having an axial length equal to the axial length of several stripliners.
  • Tape 22 is provided with a plurality of axially spaced apart central conductors, and after the sheet is rolled and the roll is laminated, the roll can be sliced transverse to the axis between successive central conductors to produce several compact striplines from the single roll.
  • a line of via holes can be formed in sheet 22 midway between central conductors. Encapsulating discs are then formed over the faces of each rolled stripline as described above.
  • Fig. 5 illustrates a schematic cross longitudinal section of a multiple stripline roll 50 before slicing.
  • the roll includes a plurality of center conductors layers 21 periodically spaced apart along the axial dimension.
  • a plurality of via holes 51 advantageously formed midway between successive center conductors provide precise guidance for each line of slicing xx'. (For convenience only one line of slicing is shown).
  • each stripline disc is doubled by doubling the center conductor back on itself on the same ceramic strip.
  • the center conductor 21 does a "u-turn" on the insulating strip, providing twice the length and twice the delay.
  • a series of ground vias helps separate the two lines.
  • the turn is at the center of the wound spiral and both the input and the output are taken from the periphery of the spiral roll.
  • Fig. 6 is a schematic perspective view of a delay line 60 having a doubled stripline.
  • the two halves of the line 21 A and 2 IB are connected by conductive segment 61 at the center of the roll 30. Thereafter, the two halves are electromagnetically separated by space and by a series of ground vias 61.
  • the ground vias are spaced apart along the length of the stripline by a spacing of less than one-tenth of a wavelength at the highest frequency of operation.
  • the ground vias 61 are conductive vias located between the "center" conductor halves 21 A, 2 IB.
  • the conductive ground vias extend through insulating layers 22, 24 to electrically contact the ground layers on both sides of the striplines.
  • a disc delay line can be produced inexpensively and with good electrical properties by the process of Fig. 1 using HTCC or LTCC tape, such as DuPont 951 described in the DuPont material data sheet entitled "951 Low-Temperature Cofire Dielectric Tape".
  • DuPont 6141 silver conductor may be deposited on the surface of flexible, unfired ceramic tape (green tape) to form the ground and strip conductors.
  • Printing can be accomplished using a squeegee printer and a metal stencil for vias and a metal screen for surface conductors.
  • the ground and center strip layers can be deposited on individual green tapes.
  • the metal conductors for the ground and center strip are normally deposited by screen printing thick film inks. After printing the solvents in the material are dried at 70° C for 30 minutes.
  • the two tapes are then stacked such that the center strip vias are aligned to openings in the ground layer, and then the tapes are tacked together using a high temperature (200° C), 3 mm diameter tool.
  • the openings prevent unwanted connections between the center strip and the ground planes.
  • the tapes may be laminated by applying pressure of 3000 - 4000 PSI at 70° C. The pressure creates adhesion between the binders in the two tapes.
  • After lamination the tapes are rolled. The axis of the roll is perpendicular to the direction of the length of the center strip lines. The best electrical and mechanical performance is achieved if the tapes are rolled such that each center strip is directly aligned over itself on subsequent layers of the roll.
  • the inside diameter of the roll should be large enough to avoid tape cracking.
  • the inside diameter may be formed by rolling on an extruded unfired ceramic rod. Once the tapes are rolled a second, isostatic lamination is effected by applying pressure of 3000 - 4000 PSI at 70° C. This lamination creates one mass with each of the layers in the roll adhering to the adjacent layer. Once the roll is laminated it is necessary to slice out the individual delay lines as sown in figure 6. Slicing may be completed using a hot wire or knife with a tip temperature of 100° C. The encapsulating disc may now be added to both faces of the roll. The metal conductors for the ground and I/O connections of the encapsulating disc are normally deposited by screen printing.
  • the encapsulating disc may also be green tape with vias, or the disc may be a solid metal layer.
  • An additional lamination step adheres the encapsulating disc to the roll. Once the final lamination is complete the assembly is fired. During the firing process the assembly is heated to ⁇ 400° C to burn off the organic materials in the tape layers. After the burn-off stage, the assembly is heated to 850° C to sinter the glass. After the assembly exits the furnace and cools, the assembly forms a solid ceramic mass. The glass fuses all of the materials in the assembly together forming a solid circuit device that will function as a delay line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Waveguides (AREA)
  • Pulse Circuits (AREA)

Abstract

Selon l'invention, une ligne de retard comprend une ligne de transmission de bande enroulée en spirale encapsulée dans des disques à sol conducteur. Dans un mode de réalisation avantageux, la ligne de retard consiste en une structure en céramique monolithique produite par formation d'une ligne à ruban sur une bande en céramique verte, par enroulement en spirale de ruban vert, par logement du ruban enroulé dans des disques d'encapsulation en céramique vert et par cocuisson de l'ensemble vert en un disque compact monolithique.
PCT/US2003/001240 2002-01-08 2003-01-03 Ligne de retard de disque monolithique et procede de fabrication correspondant WO2003059025A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003205162A AU2003205162A1 (en) 2002-01-08 2003-01-03 Monolithic disc delay line and method for making same
EP03703831A EP1470742A4 (fr) 2002-01-08 2003-01-03 Ligne de retard de disque monolithique et procede de fabrication correspondant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0241267 2002-01-08
GB10/041,267 2010-03-12

Publications (2)

Publication Number Publication Date
WO2003059025A2 true WO2003059025A2 (fr) 2003-07-17
WO2003059025A3 WO2003059025A3 (fr) 2004-01-15

Family

ID=9950577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/001240 WO2003059025A2 (fr) 2002-01-08 2003-01-03 Ligne de retard de disque monolithique et procede de fabrication correspondant

Country Status (3)

Country Link
EP (1) EP1470742A4 (fr)
AU (1) AU2003205162A1 (fr)
WO (1) WO2003059025A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007141242A1 (fr) * 2006-06-08 2007-12-13 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression avec aptitude à l'allumage améliorée et générateur d'impulsions à haute tension
WO2007141286A2 (fr) * 2006-06-08 2007-12-13 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression avec générateur d'impulsions à haute tension et procédé de fabrication d'un générateur d'impulsions à haute tension
EP2101344A1 (fr) * 2005-12-23 2009-09-16 Osram Gesellschaft mit beschränkter Haftung Générateur d'impulsions haute tension et lampe à décharge haute tension ayant tel générateur d'impulsions haute tension
US10401012B2 (en) 2002-05-08 2019-09-03 Phoseon Technology, Inc. High efficiency solid-state light source and methods of use and manufacture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781955A (en) * 1970-12-21 1974-01-01 V Lavrinenko Method of making a piezoelectric element
US4627160A (en) * 1985-08-02 1986-12-09 International Business Machines Corporation Method for removal of carbonaceous residues from ceramic structures having internal metallurgy

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB924131A (en) * 1957-12-23 1963-04-24 Ass Elect Ind Improvements relating to pulse forming networks and delay lines
US3643182A (en) * 1970-12-14 1972-02-15 Zenith Radio Corp Compact distributed-parameter network
US4783359A (en) * 1986-11-18 1988-11-08 Rogers Corporation Electronic signal time dealy device and method of making the same
JP2545098B2 (ja) * 1987-10-09 1996-10-16 三井石油化学工業株式会社 可飽和インダクタの製造方法
JPH09260912A (ja) * 1996-03-26 1997-10-03 Murata Mfg Co Ltd ディレイライン

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781955A (en) * 1970-12-21 1974-01-01 V Lavrinenko Method of making a piezoelectric element
US4627160A (en) * 1985-08-02 1986-12-09 International Business Machines Corporation Method for removal of carbonaceous residues from ceramic structures having internal metallurgy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1470742A2 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10401012B2 (en) 2002-05-08 2019-09-03 Phoseon Technology, Inc. High efficiency solid-state light source and methods of use and manufacture
EP2101344A1 (fr) * 2005-12-23 2009-09-16 Osram Gesellschaft mit beschränkter Haftung Générateur d'impulsions haute tension et lampe à décharge haute tension ayant tel générateur d'impulsions haute tension
US8183782B2 (en) 2005-12-23 2012-05-22 Osram Ag High-pressure discharge lamp with improved ignitability and high-voltage pulse generator
WO2007141242A1 (fr) * 2006-06-08 2007-12-13 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression avec aptitude à l'allumage améliorée et générateur d'impulsions à haute tension
WO2007141286A2 (fr) * 2006-06-08 2007-12-13 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression avec générateur d'impulsions à haute tension et procédé de fabrication d'un générateur d'impulsions à haute tension
WO2007141240A2 (fr) * 2006-06-08 2007-12-13 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression à capacité d'allumage améliorée et générateur d'impulsions de haute tension
WO2007141286A3 (fr) * 2006-06-08 2008-07-31 Osram Gmbh Lampe à décharge à haute pression avec générateur d'impulsions à haute tension et procédé de fabrication d'un générateur d'impulsions à haute tension
WO2007141240A3 (fr) * 2006-06-08 2008-09-04 Osram Gmbh Lampe à décharge à haute pression à capacité d'allumage améliorée et générateur d'impulsions de haute tension
US8044605B2 (en) 2006-06-08 2011-10-25 Osram Ag High-pressure discharge lamp with an improved starting capability, as well as a high-voltage pulse generator

Also Published As

Publication number Publication date
EP1470742A2 (fr) 2004-10-27
AU2003205162A1 (en) 2003-07-24
AU2003205162A8 (en) 2003-07-24
WO2003059025A3 (fr) 2004-01-15
EP1470742A4 (fr) 2005-02-09

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