EP0631293B1 - Inductivité plane avec calibrage opérative dans un système RF - Google Patents

Inductivité plane avec calibrage opérative dans un système RF Download PDF

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Publication number
EP0631293B1
EP0631293B1 EP94830295A EP94830295A EP0631293B1 EP 0631293 B1 EP0631293 B1 EP 0631293B1 EP 94830295 A EP94830295 A EP 94830295A EP 94830295 A EP94830295 A EP 94830295A EP 0631293 B1 EP0631293 B1 EP 0631293B1
Authority
EP
European Patent Office
Prior art keywords
inductor
geometry
thick
serigraph
planar
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP94830295A
Other languages
German (de)
English (en)
Other versions
EP0631293A1 (fr
Inventor
Franco Lanzano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TELECONTROLLI SpA
Original Assignee
TELECONTROLLI SpA
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 TELECONTROLLI SpA filed Critical TELECONTROLLI SpA
Publication of EP0631293A1 publication Critical patent/EP0631293A1/fr
Application granted granted Critical
Publication of EP0631293B1 publication Critical patent/EP0631293B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/041—Printed circuit coils
    • H01F41/045—Trimming
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances

Definitions

  • This invention relates to a planar inductor calibrated for obtaining the optimum value for tuning a radio frequency electronic circuit. Such callibrations allows the tuning to be carried out in a completely automatic way, the operative calibration being effected by changing the geometry of the planar inductor.
  • the tuning of a RF electronic circuit is usually carried out by changing the value of the LC components of an oscillating circuit. In most cases the capacity is changed by means of varying capacitors. This involves the use of varying capacitors of relatively high cost as well as a tuning unstability in time. Moreover, in case a wire inductor is used, the tuning process consisting in a manual deformation of the inductor is a long, little precise operation.
  • planar coils as well as the method of calculating the size thereof are known at the state of art, however, such planar components are essentially fixed-value inductances and should have a varying capacitor connected in parallel for tuning the circuit.
  • JP Patent A-4,148,514 relates to an inductance adjustment method by shaving off at least one part of a conductor pattern which forms a printed coil on a substrate.
  • the inductance of the printed coil is set so as to be smaller than a prescribed value. While the inductance of the printed coil and the resonance frequency of a resonance circuit formed of the printed coil are being measured, one part of the conductor pattern is shaved off from its side part. When the prescribed value is obtained, the shaving operation is stopped.
  • JP Patent A-4,094,505 relates to an inductance adjustment method by removing the edge of the conductor. Pattern which forms a printed coil on a substrate.
  • the spiral-shaped conductor pattern comprises an inductance adjustment section, the adge of the latter is gradually removed by a laser beam or other means while measuring the inductance and reducing the area until the inductance reaches a specified value.
  • the present invention seeks to provide a thick-film planar inductor which allows a RF calibration for the tuning to be fully automated.
  • a further object of the present invention is to provide a serigraph planar inductor which cannot be deformed due to any mechanical stress occurring in the circuit.
  • Still another object of the present invention consists in that the serigraph planar inductor is made by an apparatus operating according to the thick-film technology of standard use and limited cost in the frame of the present techniques of construction of the electronic circuits.
  • a thick-film planar inductor formed by a serigraph sediment of conductive thick-film pastes, and through an operative automatic calibration which modifies the geometry of the inductor while tuning the circuit in which the inductor is connected.
  • the geometry of the serigraph inductor and the value of the inductance is changed by varying the length of the path of the deposited conductive layer; said geometry of the serigraph inductor has suitable areas, the form of which can be changed by means of a kerf which can be made in the stripe of the conductive material, thus providing the extention of the inductor by separating two specific edges.
  • the rough geometry of the inductor is obtained by depositing a thick-film conductive paste of silver, platinum or gold by planar serigraphy on a ceramic substrate. This is accomplished by means of conventional known technologies.
  • the geometry of the inductor preferably a square spiral or fret, has suitable areas the form of which can be changed. Designated by A is the initial end of the inductance, by B the final end of the same, by C the kerf which can be made in the stripe of conductive material, thus providing the extension of the inductor by separating edges C' and C".
  • the geometry of the serigraph inductor and then the value of the inductance is changed by varying the length of the path of the deposited conductive layer.
  • a YAG laser shown in Fig. 2 by block 2 is used, said laser etching the inductor at area C of Fig. 1.
  • the electrical values 4 relative to the circuit to be tuned are evaluated by the schematic control system of Fig. 2 so as to carry out a calibration by a fine, automatic adjustment of the inductor.
  • the electrical values 4 act on a laser controller 5 which controls the incision of the inductor.
  • the frequency tuning is carried out by an amplitude calibration.
  • the resonant circuit LC
  • the amplitude of the demodulated signal at the output is maximum.
  • Software 6 controlling the incision of the planar inductor is designed to determine the maximum signal through the following sequence:
  • the inductor provided by the present invention does not involve any step of manual assembling, can be interfaced to devices having components of different technology, and has the economical advantages of a low-cost technology such as the thick-film planar technology with short time of processing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)

Claims (2)

  1. Inductivité plane à pellicule épaisse formée par un dépôt sérigraphique de pâtes conductrices et obtenue grâce à un calibrage opératif automatique qui modifie la géométrie de l'inductivité pendant la syntonisation du circuit où agit l'inductivité, caractérisée en ce que la géométrie de l'inductivité sérigraphique et la valeur de l'inductance varient en changeant la longueur du parcours de la couche conductrice déposée, ladite géométrie de l'inductivité sérigraphique ayant des aires appropriées dont la forme peut être changée grâce à une rainure (C) obtenue dans la bande de matériel conducteur, en réalisant ainsi l'allongement de l'inductivité par la séparation des deux bords (C', C").
  2. Inductivité plane à pellicule épaisse selon la Revendication 1, caractérisée en ce que la géométrie de l'inductivité est du type en spirale carrée ou grecque.
EP94830295A 1993-06-24 1994-06-15 Inductivité plane avec calibrage opérative dans un système RF Expired - Lifetime EP0631293B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM930414A IT1262369B (it) 1993-06-24 1993-06-24 Induttore planare e metodo di taratura funzionale dello stesso in sistema a rf.
ITRM930414 1993-06-24

Publications (2)

Publication Number Publication Date
EP0631293A1 EP0631293A1 (fr) 1994-12-28
EP0631293B1 true EP0631293B1 (fr) 2001-05-16

Family

ID=11401823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830295A Expired - Lifetime EP0631293B1 (fr) 1993-06-24 1994-06-15 Inductivité plane avec calibrage opérative dans un système RF

Country Status (4)

Country Link
EP (1) EP0631293B1 (fr)
DE (1) DE69427208T2 (fr)
ES (1) ES2094704T3 (fr)
IT (1) IT1262369B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3634305B2 (ja) 2001-12-14 2005-03-30 三菱電機株式会社 積層インダクタンス素子
DE10310434A1 (de) * 2003-03-11 2004-09-30 Krone Gmbh Verfahren zum HF-Abstimmen einer elektrischen Anordnung sowie eine hierzu geeignete Leiterplatte

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798059A (en) * 1970-04-20 1974-03-19 Rca Corp Thick film inductor with ferromagnetic core
JPH0494505A (ja) * 1990-08-10 1992-03-26 Murata Mfg Co Ltd 印刷インダクタのインダクタンス調整方法
JPH04148514A (ja) * 1990-10-12 1992-05-21 Murata Mfg Co Ltd 印刷コイルのインダクタンス調整方法

Also Published As

Publication number Publication date
DE69427208D1 (de) 2001-06-21
IT1262369B (it) 1996-06-19
EP0631293A1 (fr) 1994-12-28
ITRM930414A1 (it) 1994-12-24
DE69427208T2 (de) 2002-04-18
ES2094704T1 (es) 1997-02-01
ITRM930414A0 (it) 1993-06-24
ES2094704T3 (es) 2001-09-16

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