EP0117178B1 - Filtre hyperfréquence à résonateurs linéaires - Google Patents

Filtre hyperfréquence à résonateurs linéaires Download PDF

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Publication number
EP0117178B1
EP0117178B1 EP84400151A EP84400151A EP0117178B1 EP 0117178 B1 EP0117178 B1 EP 0117178B1 EP 84400151 A EP84400151 A EP 84400151A EP 84400151 A EP84400151 A EP 84400151A EP 0117178 B1 EP0117178 B1 EP 0117178B1
Authority
EP
European Patent Office
Prior art keywords
conductor
resonator
filter according
conductors
filter
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
Application number
EP84400151A
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German (de)
English (en)
French (fr)
Other versions
EP0117178A1 (fr
Inventor
Clément-François Lacour
Patrick Janer
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.)
Alcatel Thomson Faisceaux Hertziens SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
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Application filed by Alcatel Thomson Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0117178A1 publication Critical patent/EP0117178A1/fr
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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
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20372—Hairpin resonators
    • 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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities

Definitions

  • the present invention relates to microwave filters of small dimensions, with linear resonators constituted by one or more conductors.
  • the branches of the "U", forming the resonators are mutually parallel and are dimensioned so that the total developed length of each of the "U" is equal to half the wavelength ⁇ agree of the resonator.
  • the coupling coefficient between two resonators depends on the width of the conductor constituting the resonator, on the distance between the branches of two adjacent "U” as well as on the space existing between the two branches of the same "U".
  • the object of the invention is to remedy the aforementioned drawbacks.
  • the subject of the invention is a microwave filter with linear resonators, piece by piece, constituted by at least one conductor placed on the first flat face of a substrate made of dielectric material, the second face parallel to the first face is metallized to constitute a ground plane, the ends of each conductor being connected to the ground plane, characterized in that the length of each conductor is less than the half wavelength of the wave of frequency F o of resonance of the resonator that it constitutes and in that the middle of each conductor is also connected to the ground plane by means of at least one capacitor to tune each resonator to its resonant frequency F o .
  • This arrangement has the advantage that it makes each resonator tunable to the resonant frequency F on which it is desired to be adjusted while eliminating the parasitic resonances at higher frequencies multiple of F o .
  • the filter comprises a substrate 1, having two plane rectangular faces 2 and 3, mutually parallel, spaced a few tenths of a millimeter apart to serve as a support for two conductors 4 and 5 in the shape of a "U" and with two coupling conductors 6, 7 having roughly parallel directions.
  • the substrate 1 is made of a material with high permittivity, of the magnesium titanate, alumina or teflon glass type.
  • the conductors 4,5,6 and 7 are deposited, for example, by metallization of ribbons on the first face 2 of the substrate.
  • the second face 3 of the substrate is covered entirely, by a metallic layer also deposited by metallization or any other equivalent means.
  • the conductors 4 and 5 form, with the metal layer covering the face 3 of the substrate, two resonators which are supplied, in the example, by means of the coupling conductor 6 carrying the microwave signal applied to the input of the filter. These resonators rotate on a member external to the filter, not shown, the filtered signal, by means of the coupling conductor 7.
  • the "U" formed by the conductors 4 and 5 have reversed positions with respect to each other and their respective branches 4a, 4b, and 5a, 5b have directions roughly parallel to the direction of the coupling conductors 6 and 7.
  • the adjacent branches 4b and 5a of each resonator are slightly spaced from one another, to allow their electromagnetic coupling.
  • the branches 4a and 5b are slightly spaced from the coupling conductors 6 and 7 to allow the coupling of the conductors 6 and 7 with each of the resonators.
  • the ends of each of the U-shaped conductors 4 and 5 are connected to the ground plane, covering the face 3 of the substrate 1, by means of the metallized holes 8, 9, 10 and 11.
  • Two capacitors 12 and 13 are respectively placed, between the middle of the conductors 4 and 5 and the ground plane, inside holes made in the thickness of the substrate 1.
  • the plates 12a and 13a of the capacitors 12 and 13 are welded respectively in the middle of the conductors 4 and 5 and the plates 12b and 13b of the capacitors 12 and 13 are welded to the ground plane located on the second face of the substrate 3.
  • the spaces between the plates 12a and 12b on the one hand, and 13a and 13b d on the other hand are adjusted by means of plunger cores, respectively 14 and 15, which can be moved inside reinforcing bodies 12b and 13b.
  • FIG. 2 The diagram of a resonator, applicable to the construction of the filters according to the invention, is shown in simplified form in FIG. 2.
  • the resonator of FIG. 2 is constituted similarly to those of FIG. 1, by a folded line 16 in the shape of a "U", the ends 17 and 18 of which are connected to the filter supply mass, and the middle of which is also connected to the mass, through, of a variable capacitor 19.
  • the length L o of line 16 is chosen to be less than the resonance wavelength to allow tuning of the resonator using the capacitor 19.
  • This type of resonator allows both very good control and very good rejection of the parasitic frequencies.
  • the value of the capacitor 19 is adjusted to a value of almost zero.
  • the spurious responses at frequencies multiple of 2. F are suppressed due to the fact that the branches of the resonator bring a short circuit across the terminals of the capacitor 19.
  • the value of the capacitor 19 must be adjusted to a non negligible value to obtain the resonance of the resonator and the rejection of the parasitic frequencies, multiples, in this case, of il F o , where 8a represents l electrical angle corresponding to the half section of line of length equal to ⁇ .
  • FIG. 3 represents the capacitor 12 of FIG. 1, mounted on the substrate 1.
  • each armature 12a and 12b of the capacitor is connected respectively to the conductor 4 and to the ground plane covering the substrate 1 by the weld beads 20 and 21.
  • each resonator As each resonator is connected by its two ends to ground, the radiating dipole that it forms, emits less energy than a dipole with the open ends of the prior art, so that the couplings between nonadjacent resonators are are found to be greatly attenuated.
  • the structure of each resonator can be reduced to a simple equivalent diagram in the form of a dipole which facilitates the determination, by calculation, of the filters.
  • FIG. 4 An example of an equivalent diagram is shown in FIG. 4.
  • the resonator, formed by the conductor 4a of FIG. 1 is equivalent to a line formed by the conductors 20, 21, short-circuited at one end by a conductor 24 and connected at its other end to the terminals of capacitor 12.
  • conductor 4b is equivalent to a line formed by conductors 22 and 23, short-circuited at one end by conductor 25 and connected at its other end to terminals of the capacitor 12.
  • the conductors 5a and 5b forming the branches of the "U" of the second resonator of FIG. 1 are equivalent to a line formed by the conductors 26, 27 short-circuited at one end by the conductor 28 and connected at its other end to the terminals of the capacitor 13.
  • the conductor 5b is equivalent to a line formed by the conductors 29 and 30, short-circuited at one end by the conductor 31 and connected at its other end to the b ornes of the capacitor 13.
  • FIG. 5 represents an embodiment of a notch filter using the "U" resonators according to the invention which comprises a single access line 35 the two ends of which constitute the inlet and the outlet of the filter respectively .
  • Three resonators 36, 37 and 38 are arranged in the same plane as line 35 with their branches parallel to line 35 and are placed on either side of this line.
  • FIG. 6 represents a transmission curve obtained using a bandpass filter centered on the frequency 1852.5 MHz where it can be seen that up to 12 GHz the filter remains insensitive at spurious frequencies.
  • the invention is also not limited to the number of resonators used, nor to the shape of the resonators which, instead of being in "U" shape, can take any shape, in V, linear or otherwise, nor the type of capacitors used.
  • the capacitors can be either tunable, fixed or formed by inter-digitized capacitors etched on the substrate.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP84400151A 1983-01-31 1984-01-24 Filtre hyperfréquence à résonateurs linéaires Expired EP0117178B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8301454A FR2540294B1 (fr) 1983-01-31 1983-01-31 Filtre hyperfrequence a resonateurs lineaires
FR8301454 1983-01-31

Publications (2)

Publication Number Publication Date
EP0117178A1 EP0117178A1 (fr) 1984-08-29
EP0117178B1 true EP0117178B1 (fr) 1987-10-14

Family

ID=9285440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400151A Expired EP0117178B1 (fr) 1983-01-31 1984-01-24 Filtre hyperfréquence à résonateurs linéaires

Country Status (5)

Country Link
US (1) US4578656A (pt)
EP (1) EP0117178B1 (pt)
JP (1) JPS59121904U (pt)
DE (1) DE3466838D1 (pt)
FR (1) FR2540294B1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835480A1 (de) * 1988-10-18 1990-04-19 Fraunhofer Ges Forschung Hochfrequenz-bandpassfilter

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GB2164804B (en) * 1984-09-17 1989-03-15 Stc Plc Filters for transmission systems
FR2572591B1 (fr) * 1984-10-26 1987-12-18 Portenseigne Sa Cellule de filtrage et filtre de canal comprenant une association de telles cellules
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FR2578104B1 (fr) * 1985-02-27 1987-03-20 Alcatel Thomson Faisceaux Filtre passe-bande pour hyperfrequences
FR2589650A1 (fr) * 1985-11-05 1987-05-07 Radiotechnique Circuit a ligne microbande resonnante
FR2613557A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre comportant des elements a constantes reparties associant deux types de couplage
FR2613538A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre hyperfrequence
US4757287A (en) * 1987-10-20 1988-07-12 Gte Service Corporation Voltage tunable half wavelength microstrip filter
US5231349A (en) * 1988-05-20 1993-07-27 The Board Of Trustees Of The Leland Stanford Junior University Millimeter-wave active probe system
JPH02146801A (ja) * 1988-11-28 1990-06-06 Fujitsu Ltd 中心周波数可変帯域通過フィルタ
US6026311A (en) * 1993-05-28 2000-02-15 Superconductor Technologies, Inc. High temperature superconducting structures and methods for high Q, reduced intermodulation resonators and filters
US7231238B2 (en) 1989-01-13 2007-06-12 Superconductor Technologies, Inc. High temperature spiral snake superconducting resonator having wider runs with higher current density
CA1264073A (en) * 1989-02-09 1989-12-27 Protap Pramanick Microstripline interdigital planar filter
JPH0385903A (ja) * 1989-08-30 1991-04-11 Kyocera Corp 帯域通過フィルタ
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
US5406233A (en) * 1991-02-08 1995-04-11 Massachusetts Institute Of Technology Tunable stripline devices
JP2502824B2 (ja) * 1991-03-13 1996-05-29 松下電器産業株式会社 平面型誘電体フィルタ
US5241291A (en) * 1991-07-05 1993-08-31 Motorola, Inc. Transmission line filter having a varactor for tuning a transmission zero
JPH06104608A (ja) * 1992-09-24 1994-04-15 Matsushita Electric Ind Co Ltd フィルタ
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US5888942A (en) * 1996-06-17 1999-03-30 Superconductor Technologies, Inc. Tunable microwave hairpin-comb superconductive filters for narrow-band applications
US6350335B1 (en) 1999-02-16 2002-02-26 Lucent Technologies Inc. Microstrip phase shifters
US6127906A (en) * 1999-02-25 2000-10-03 Thin Film Technology Corp. Modular thin film distributed filter
AU2424201A (en) 1999-11-04 2001-05-14 Paratek Microwave, Inc. Microstrip tunable filters tuned by dielectric varactors
KR100367718B1 (ko) * 1999-11-23 2003-01-10 에스지씨테크놀로지 주식회사 직렬구조의 ｕ자형 공진기를 갖는 고주파 필터
KR20010094784A (ko) * 2000-04-06 2001-11-03 윤종용 커패시터 보상회로를 갖는 콤라인 구조의 무선필터
AU2002228865A1 (en) 2000-11-14 2002-05-27 Paratek Microwave, Inc. Hybrid resonator microstrip line filters
US6717491B2 (en) 2001-04-17 2004-04-06 Paratek Microwave, Inc. Hairpin microstrip line electrically tunable filters
US20030222732A1 (en) * 2002-05-29 2003-12-04 Superconductor Technologies, Inc. Narrow-band filters with zig-zag hairpin resonator
KR100675393B1 (ko) * 2005-02-25 2007-01-29 삼성전자주식회사 집중소자 커패시터와 접지를 이용하여 소형화한 평행결합선로 필터 및 그 제조방법
US7688162B2 (en) * 2006-11-16 2010-03-30 Harris Stratex Networks, Inc. Hairpin microstrip bandpass filter
TWI330903B (en) * 2007-08-13 2010-09-21 Ind Tech Res Inst Filtering circuit and structure thereof
US9270008B2 (en) * 2011-01-28 2016-02-23 The University Of Electro-Communications Transmission line resonator, bandpass filter using transmission line resonator, multiplexer, balanced-to-unbalanced transformer, power divider, unbalanced-to-balanced transformer, frequency mixer, and balance-type filter
US8933768B2 (en) * 2011-10-25 2015-01-13 Zih Corp. Structures for registration error compensation
CN106848505A (zh) * 2017-01-11 2017-06-13 电子科技大学 基于混合耦合的微带滤波器设计方法
RU2684438C1 (ru) * 2018-06-18 2019-04-09 Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" Полосковый фильтр
US20210376436A1 (en) * 2018-09-17 2021-12-02 European Space Agency A radio frequency pass-band filter
CN112753130B (zh) 2018-09-28 2022-08-05 株式会社村田制作所 带通滤波器、通信装置以及谐振器
RU2730395C1 (ru) * 2019-11-25 2020-08-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Сибирский государственный университет науки и технологий имени академика М.Ф. Решетнева" (СибГУ им. М.Ф. Решетнева) Микрополосковый сверхширокополосный фильтр

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835480A1 (de) * 1988-10-18 1990-04-19 Fraunhofer Ges Forschung Hochfrequenz-bandpassfilter

Also Published As

Publication number Publication date
JPS59121904U (ja) 1984-08-16
FR2540294B1 (fr) 1985-10-04
JPH0230883Y2 (pt) 1990-08-21
DE3466838D1 (en) 1987-11-19
US4578656A (en) 1986-03-25
EP0117178A1 (fr) 1984-08-29
FR2540294A1 (fr) 1984-08-03

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