EP0127527A1 - Einstellungsverfahren, besonders Frequenzeinstellungsverfahren eines gedruckten Mikrostreifenleitungsfilters, und Filter nach dieser Art - Google Patents

Einstellungsverfahren, besonders Frequenzeinstellungsverfahren eines gedruckten Mikrostreifenleitungsfilters, und Filter nach dieser Art Download PDF

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Publication number
EP0127527A1
EP0127527A1 EP84401028A EP84401028A EP0127527A1 EP 0127527 A1 EP0127527 A1 EP 0127527A1 EP 84401028 A EP84401028 A EP 84401028A EP 84401028 A EP84401028 A EP 84401028A EP 0127527 A1 EP0127527 A1 EP 0127527A1
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EP
European Patent Office
Prior art keywords
filter
dielectric material
dielectric
deposited
adjustment
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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.)
Granted
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EP84401028A
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English (en)
French (fr)
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EP0127527B1 (de
Inventor
Marcel Motola
Jean René Jecko
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Thales SA
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Thomson CSF SA
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Publication of EP0127527B1 publication Critical patent/EP0127527B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters

Definitions

  • the present invention relates to filters with elements with distributed constants, such as filters printed in "microstrip" lines.
  • the invention relates more particularly to an adjustment process, in particular in frequency of a filter printed in "microstrip" lines, and the filter obtained by this process.
  • Such filters comprise a dielectric support, on which have been, for example etched, metallizations. These metallizations can have different shapes.
  • a first way is to vary the length of the microstrips, for example by cutting part of these microstrips with a scalpel.
  • This way of adjusting a filter has the serious disadvantage of being irreversible. This is particularly serious in the event that the desired adjustment value has been exceeded.
  • cutting a part of these microstrips with a scalpel risks damaging the support on which they are deposited, which can lead to an immediate change in its electrical characteristics and chemical degradation in the long run.
  • Another way of adjusting the frequency of the filters printed in microstrip lines, illustrated in FIG. 1, consists in soldering capacitors at the ends of the strips. The process which is the subject of the present invention allows filter adjustment, not having these drawbacks.
  • the main object of the invention is a method for adjusting the electrical characteristics of a filter with distributed constants, characterized in that at least one dielectric material of a given geometry is deposited.
  • FIG. 1 we can see a filter with distributed constants with alternating fingers, called interdigitated filter.
  • the filter comprises, etched on a dielectric support 1, microstrips 2, 3 and 4.
  • the microstrips 2 and 3 respectively constitute the electrical input and the output of the filter.
  • the microstrips 4 constitute resonators allowing filtering.
  • the ends of the microstrips 4 are grounded 6.
  • the filter illustrated in FIG. 1 is a bandpass filter. It may be interesting to adjust the center frequency of such a filter. This adjustment can be made necessary by manufacturing tolerances, for example the variation of the dielectric constant of the support 1 or the variation of its thickness.
  • the variations in the central frequency of the filter can also come from the etching of the microstrips 2, 3 and 4.
  • the ends of the microstrips 4 of the capacitors 5 are welded. These capacitors 5 are placed between the ends of the microstrips 4 and the mass 6. This allows the filter to be adjusted in frequency.
  • FIG. 2 an example of a bandpass filter according to the invention can be seen.
  • the filter is called the hairpin type because it has 7 microstrip U-band resonators that propagate the signal, the shape of which resembles that of hairpins.
  • the L-shaped microstrips 2 and 3 respectively constitute the electrical input and output of the filter.
  • On the microstrips is placed a dielectric element 8.
  • the presence of an element 8 has the effect of modifying the behavior of the filter.
  • the invention proposes to use these modifications of the behavior of the filter to carry out an adjustment either to modify the behavior of the same filter during its operation, or to adjust a filter, for example at a predetermined central frequency to overcome d '' a dispersion of the center frequencies due to too large manufacturing tolerances.
  • the element 8 consists of a low loss dielectric, such as for example PTFE (polytetrafuoroethylene).
  • the element 8 has a constant thickness.
  • the element 8 has a constant width in the plane of the resonators 2, 3 and 7.
  • the microstrips which constitute the resonators 2, 3, 4 and 7 will bear the reference 9.
  • the element 8 is a rectangular parallelepiped ribbon.
  • the width of the dielectric element 8 decreases as one moves away from the microstrips 9.
  • the ribbon 8 is arranged perpendicular to the resonators of the filter.
  • the ribbon 8 is deposited on all the resonators of the filter.
  • the ribbon 8 is deposited so as to respect the symmetry of the distribution of the lines of the fields of the filter. In Figure 2, this has was achieved by superimposing the axis of symmetry of the filter with the axis of symmetry of the ribbon 8, which covers all the resonators 7. This facilitates the prediction of the influence of the ribbon 8 on the behavior of the filter. Thus the frequency displacement of the filtering curve is effected without the latter changing shape.
  • the invention is particularly advantageous for filters of this type having for example the bandwidth ratio at 3 decibels on the center frequency less than 0.1. Indeed, the adjustment values are limited by the dielectric materials currently available. For such filters, it is possible to obtain a frequency displacement of the filtering curve without the latter changing shape.
  • the filter is produced from a PTFE substrate 1 loaded with ceramic sold by the company ROGERS under the reference DUROID 6010.
  • the substrate has a 35um copper deposit on both sides. One operates on one of these copper deposits the etching of the microstrips, the other deposit constituting the mass of the filter.
  • the filter of figure 2 has a central frequency of 1000MHz and a bandwidth for an attenuation Je 3 decibels of 50MHz.
  • the filter is covered with a cover, for example made of stainless steel.
  • the cover makes it possible to close to the ground the field lines which are not captive of the dielectric substrate.
  • the cover for example, provides a space of 3mm above the pattern of the filter.
  • this space is filled with the ribbon 8.
  • the filter is adjusted by selecting the width L of the ribbon 8.
  • the ribbon 8 is constituted by a low loss dielectric, for example the PTFE sold by DUPONT DE NEMOURS under the reference dielectric constant TFE 5 teflon close to 2.
  • the adjustment is effected either by reducing the width of the ribbon 8, for example by cutting with a scalpel until the desired value is obtained, or by having a set of ribbon 8 of various widths.
  • the ribbon 8 of desired width is then placed on the filter to be adjusted. The adjustment thus operated is reversible, since it suffices to remove the ribbon 8. If the value of the desired central frequency is exceeded, it is sufficient to replace the ribbon 8 without touching the filter.
  • FIG. 3 an alternative embodiment of the filter according to the invention can be seen.
  • the frequency displacement is obtained by placing on the microstrips 9 a ribbon 8 of fixed width, the thickness of which is varied either by machining or by stacking a certain number of elementary dielectric plates 10, 11, 12.
  • the plates 10, 11, 12 do not have the same dielectric constant. The adjustment then takes place, not only by the thickness and the number of plates, but also by their arrangement in the stack. The influence of the dielectric plates 10, 11, 12 is linked to the distance separating them from the microstrips. Thus, placing the wafers with a large dielectric constant near the microstrips 9 increases the value of the corrections made by the adjustment.
  • Figure 4 is a figure illustrating the result of the adjustments obtained with the device of Figure 2.
  • Curve 16 represents the insertion losses as a function of the frequency of the filter without the ribbon 8.
  • the central frequency (A) of the filter equipped with its cover is 1025 MHz.
  • Curve 17 represents the insertion losses as a function of the frequency of the filter fitted with a PTFE tape with a width of one centimeter.
  • the central frequency (B) of the filter is then 1013 MHz.
  • Curve 18 represents the insertion losses as a function of the frequency of a filter fitted with a 2 cm wide PTFE tape.
  • the central frequency (C) of the filter is then 999MHz.
  • the displacement of the central frequency is proportional to the width of the bar, with a sensitivity in the illustrated example of 13 MHz per cm.
  • the adjustment of the center frequency is possible up to at least 3%. This makes it possible to protect yourself from manufacturing dispersions, mainly due to the substrate and whose influence on the central frequency of the filter for, for example, DUROID 6010 is of the order of ⁇ 1.5%.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP84401028A 1983-05-31 1984-05-18 Einstellungsverfahren, besonders Frequenzeinstellungsverfahren eines gedruckten Mikrostreifenleitungsfilters, und Filter nach dieser Art Expired - Lifetime EP0127527B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8309008A FR2547116B1 (fr) 1983-05-31 1983-05-31 Procede d'ajustage notamment en frequence d'un filtre imprime en ligne " microbandes ", et filtre obtenu par ce procede
FR8309008 1983-05-31

Publications (2)

Publication Number Publication Date
EP0127527A1 true EP0127527A1 (de) 1984-12-05
EP0127527B1 EP0127527B1 (de) 1991-02-27

Family

ID=9289349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84401028A Expired - Lifetime EP0127527B1 (de) 1983-05-31 1984-05-18 Einstellungsverfahren, besonders Frequenzeinstellungsverfahren eines gedruckten Mikrostreifenleitungsfilters, und Filter nach dieser Art

Country Status (5)

Country Link
US (1) US4638271A (de)
EP (1) EP0127527B1 (de)
JP (1) JPS59230302A (de)
DE (1) DE3484149D1 (de)
FR (1) FR2547116B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164804A (en) * 1984-09-17 1986-03-26 Stc Plc Stripline filters for transmission systems
FR2570884A1 (fr) * 1984-09-22 1986-03-28 Smiths Industries Plc Procede pour accorder un dispositif a microlame, notamment une antenne
EP0247542A1 (de) * 1986-05-27 1987-12-02 Siemens Aktiengesellschaft Integrierter Mikrowellenschaltkreis
EP0438149A2 (de) * 1990-01-17 1991-07-24 Fujitsu Limited Dielektrisches Filter mit Dämpfungspolen
GB2240432A (en) * 1990-01-08 1991-07-31 Ngk Spark Plug Co Stripline filter
EP0532330A1 (de) * 1991-09-10 1993-03-17 Fujitsu Limited Ringresonatorvorrichtung
WO1997048146A1 (en) * 1996-06-12 1997-12-18 Philips Electronics N.V. Ceramic stripline filter
CN111463528A (zh) * 2020-04-09 2020-07-28 上海迈铸半导体科技有限公司 一种微带线滤波器及其制备方法

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6025201U (ja) * 1983-07-25 1985-02-20 株式会社村田製作所 ストリツプラインフイルタ
JPH01273402A (ja) * 1988-04-26 1989-11-01 Hitachi Chem Co Ltd マイクロストリップ線路
CA1264073A (en) * 1989-02-09 1989-12-27 Protap Pramanick Microstripline interdigital planar filter
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
US5357229A (en) * 1993-11-01 1994-10-18 Pacific Monolithics, Inc. Method for tuning a microstrip device using a plastic dielectric substance
JPH09238002A (ja) * 1996-02-29 1997-09-09 Nec Corp マイクロストリップフィルタとその中心周波数調整方法
US5781110A (en) * 1996-05-01 1998-07-14 James River Paper Company, Inc. Electronic article surveillance tag product and method of manufacturing same
WO1999018629A2 (en) * 1997-10-04 1999-04-15 World Peace Inst Of Technology Microwave filter and method for fabricating microstrip band pass filter
US6778042B2 (en) * 2000-10-30 2004-08-17 Kabushiki Kaisha Toshiba High-frequency device
JP2003069321A (ja) * 2001-08-28 2003-03-07 Nec Corp マイクロストリップフィルタの製造方法
US6741148B2 (en) * 2002-06-27 2004-05-25 Harris Corporation High efficiency coupled line filters
US6963259B2 (en) * 2002-06-27 2005-11-08 Harris Corporation High efficiency resonant line
US6794952B2 (en) * 2002-06-27 2004-09-21 Harris Corporation High efficiency low pass filter
US6982671B2 (en) * 2003-02-25 2006-01-03 Harris Corporation Slot fed microstrip antenna having enhanced slot electromagnetic coupling
US6995711B2 (en) * 2003-03-31 2006-02-07 Harris Corporation High efficiency crossed slot microstrip antenna
US7006052B2 (en) * 2003-05-15 2006-02-28 Harris Corporation Passive magnetic radome
US6975279B2 (en) * 2003-05-30 2005-12-13 Harris Foundation Efficient radome structures of variable geometry
US6985118B2 (en) * 2003-07-07 2006-01-10 Harris Corporation Multi-band horn antenna using frequency selective surfaces
US6992628B2 (en) * 2003-08-25 2006-01-31 Harris Corporation Antenna with dynamically variable operating band
US7030834B2 (en) 2003-09-03 2006-04-18 Harris Corporation Active magnetic radome
US6990729B2 (en) * 2003-09-05 2006-01-31 Harris Corporation Method for forming an inductor
US7088308B2 (en) * 2003-10-08 2006-08-08 Harris Corporation Feedback and control system for radomes
US7196607B2 (en) * 2004-03-26 2007-03-27 Harris Corporation Embedded toroidal transformers in ceramic substrates
US7158005B2 (en) * 2005-02-10 2007-01-02 Harris Corporation Embedded toroidal inductor
US7342468B2 (en) * 2005-03-11 2008-03-11 U.S. Monolithics, L.L.C. RF filter tuning system and method
US7631701B2 (en) * 2007-04-30 2009-12-15 Cnh America Llc Rigid standard bearing shield disk scraper system
US8013775B2 (en) * 2007-04-30 2011-09-06 Viasat, Inc. Radio frequency absorber
CN102763266B (zh) * 2010-02-26 2014-10-22 株式会社村田制作所 高频用电介质附着材料
US10862185B2 (en) * 2017-12-01 2020-12-08 Semiconductor Components Industries, Llc Integrated circuit with capacitor in different layer than transmission line

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DE1228011B (de) * 1963-07-02 1966-11-03 Siemens Ag Durchstimmbares Bandfilter fuer sehr kurze elektromagnetische Wellen
FR2016881A1 (de) * 1968-08-07 1970-05-15 Western Electric Co
FR2070656A1 (de) * 1969-04-25 1971-09-17 Western Electric Co
FR2494917A1 (fr) * 1980-11-27 1982-05-28 Orega Electro Mecanique Coupleur hybride hyperfrequence a large bande et melangeur equilibre le comportant

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US3617955A (en) * 1969-04-08 1971-11-02 Bell Telephone Labor Inc Temperature compensated stripline filter
US3754198A (en) * 1972-03-20 1973-08-21 Itt Microstrip filter
US4157517A (en) * 1977-12-19 1979-06-05 Motorola, Inc. Adjustable transmission line filter and method of constructing same
JPS5518185A (en) * 1978-07-27 1980-02-08 Alps Electric Co Ltd Thick-film microwave integrated circuit
US4243960A (en) * 1978-08-14 1981-01-06 The United States Of America As Represented By The Secretary Of The Navy Method and materials for tuning the center frequency of narrow-band surface-acoustic-wave (SAW) devices by means of dielectric overlays
US4218664A (en) * 1978-08-22 1980-08-19 Communications Satellite Corporation Temperature-compensated microwave integrated circuit delay line
US4288530A (en) * 1979-10-15 1981-09-08 Motorola, Inc. Method of tuning apparatus by low power laser beam removal
US4488131A (en) * 1983-02-25 1984-12-11 Hughes Aircraft Company MIC Dual mode ring resonator filter

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Publication number Priority date Publication date Assignee Title
DE1228011B (de) * 1963-07-02 1966-11-03 Siemens Ag Durchstimmbares Bandfilter fuer sehr kurze elektromagnetische Wellen
FR2016881A1 (de) * 1968-08-07 1970-05-15 Western Electric Co
FR2070656A1 (de) * 1969-04-25 1971-09-17 Western Electric Co
FR2494917A1 (fr) * 1980-11-27 1982-05-28 Orega Electro Mecanique Coupleur hybride hyperfrequence a large bande et melangeur equilibre le comportant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-26, no. 9, septembre 1978, pages 646-649, New York, US; D.D. PAOLINO: "MIC overlay coupler design using spectral domain techniques" *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164804A (en) * 1984-09-17 1986-03-26 Stc Plc Stripline filters for transmission systems
GB2164804B (en) * 1984-09-17 1989-03-15 Stc Plc Filters for transmission systems
FR2570884A1 (fr) * 1984-09-22 1986-03-28 Smiths Industries Plc Procede pour accorder un dispositif a microlame, notamment une antenne
EP0247542A1 (de) * 1986-05-27 1987-12-02 Siemens Aktiengesellschaft Integrierter Mikrowellenschaltkreis
GB2240432B (en) * 1990-01-08 1994-07-27 Ngk Spark Plug Co Stripline filter
GB2240432A (en) * 1990-01-08 1991-07-31 Ngk Spark Plug Co Stripline filter
EP0438149A3 (en) * 1990-01-17 1992-07-15 Fujitsu Limited Dielectric filter with attenuation poles
US5192926A (en) * 1990-01-17 1993-03-09 Fujitsu Limited Dielectric filter with attenuation poles
EP0438149A2 (de) * 1990-01-17 1991-07-24 Fujitsu Limited Dielektrisches Filter mit Dämpfungspolen
EP0532330A1 (de) * 1991-09-10 1993-03-17 Fujitsu Limited Ringresonatorvorrichtung
US5406238A (en) * 1991-09-10 1995-04-11 Fujitsu Limited Ring resonator device
WO1997048146A1 (en) * 1996-06-12 1997-12-18 Philips Electronics N.V. Ceramic stripline filter
US5963115A (en) * 1996-06-12 1999-10-05 U.S. Philips Corporation Ceramic filter having reduced insertion losses
CN111463528A (zh) * 2020-04-09 2020-07-28 上海迈铸半导体科技有限公司 一种微带线滤波器及其制备方法
CN111463528B (zh) * 2020-04-09 2022-05-13 上海迈铸半导体科技有限公司 一种微带线滤波器及其制备方法、mems传感器

Also Published As

Publication number Publication date
US4638271A (en) 1987-01-20
FR2547116B1 (fr) 1985-10-25
DE3484149D1 (de) 1991-04-04
FR2547116A1 (fr) 1984-12-07
EP0127527B1 (de) 1991-02-27
JPS59230302A (ja) 1984-12-24

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