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EP0285503A1 - Filter mit Elementen mit verteilten Parametern, wobei zwei Arten von Kopplungsvorrichtungen vorhanden sind - Google Patents

Filter mit Elementen mit verteilten Parametern, wobei zwei Arten von Kopplungsvorrichtungen vorhanden sind Download PDF

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Publication number
EP0285503A1
EP0285503A1 EP88400702A EP88400702A EP0285503A1 EP 0285503 A1 EP0285503 A1 EP 0285503A1 EP 88400702 A EP88400702 A EP 88400702A EP 88400702 A EP88400702 A EP 88400702A EP 0285503 A1 EP0285503 A1 EP 0285503A1
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EP
European Patent Office
Prior art keywords
resonators
filter
ground
filter according
shaped
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.)
Granted
Application number
EP88400702A
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English (en)
French (fr)
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EP0285503B1 (de
Inventor
Patrick Giraudeau
Philippe Rousseau
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Thales SA
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Thomson CSF SA
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Publication of EP0285503B1 publication Critical patent/EP0285503B1/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 invention relates mainly to a filter comprising elements with distributed constants using at least two different types of coupling.
  • Such a filter includes resonators.
  • the signal propagates by coupling between the consecutive resonators of the filter.
  • the filters with distributed constants are produced in stripline technology, the resonators being deposited by metallization on one side of a low loss dielectric, the metallization of the second side constituting the ground plane.
  • Comblin type filters present difficulties in achieving and obtaining the desired filtering.
  • the filters according to the present invention include distributed constant resonators.
  • the signal is propagated by coupling between the constituent resonators of the filter.
  • the filters according to the present invention comprise at least two types of coupling between successive resonators.
  • U-shaped resonators also called hairpin resonators
  • the inversion of certain U-shaped resonators compared to the arrangement of a filter of conventional type allows easy connection of a transverse coupler between resonators arranged symmetrically with respect to the center of the filter.
  • Such filters can be used, for example, to make templates or to eliminate frequency side lobes from an electrical signal.
  • the capacitors with variable capacitance are removed in this way, on the one hand, the reduction in capacitive coupling between capacitors is obtained, and on the other hand, facilitating the installation of said capacitors with variable capacity on the filters insofar as these capacitors are more distant from each other.
  • the main object of the invention is a microwave filter comprising a plurality of resonators, each resonator comprising at least one end capable of being brought to ground, two successive resonators having an electromagnetic coupling zone, the first and last resonators being connected to filter connection means, characterized in that said filter comprises at least one coupling zone between successive resonators whose ends capable of being brought to ground are on the same side of the axis of the filter and at least one zone of coupling between successive resonators whose ends capable of being brought to ground are opposite.
  • the filter of FIG. 1 comprises a plurality of resonators 1 in the shape of the letter U.
  • the resonators are also called hairpin resonators (hairpin in English terminology).
  • Each resonator has two branches of length L arranged symmetrically and orthogonally with respect to a base.
  • the resonators 1 are arranged in staggered rows and in such a way that the branches of the two successive resonators 1 have an electromagnetic coupling.
  • the filters include six 1-U resonators.
  • the first and last 1-U resonators are coupled with connection means 2.
  • connection means 2 comprise a branch of length L parallel to the branches of first and last resonators 1 as well as a metallized orthogonal strip terminated by a metallized hole 3.
  • the electrical connection is made at the metallized hole 3.
  • the filters illustrated in FIG. 1 have the disadvantage that it is extremely difficult to achieve coupling, by means of a capacitor between two resonators 1 in U symmetrical with respect to the transverse axis 16 of the filter.
  • the resonators arranged symmetrically with respect to a transverse axis 16 of the filter comprise bases of the U on the opposite sides of the filter, the metallizations having to join these two bases, for example of the first and the last resonators or of the second and of the fifth, may interfere with the operation of the filter.
  • the filters illustrated in FIG. 2 include a plurality of straight resonators 10.
  • the straight resonators 10 are arranged parallel to each other.
  • Each straight resonator 10 is connected, by a first of its ends to ground 4, and by a second end to a first frame of a variable capacitor 5.
  • the second frame of the variable capacitor 5 is connected to ground 4.
  • the filter illustrated in FIG. 2 can have parasitic couplings between the capacitors of variable capacitor 5 and the resonator 10 and between the capacitors themselves due to their proximity.
  • the size of the variable capacitors 5 poses problems in terms of the geometric construction of the filter due to their proximity.
  • FIG. 3 we can see a first embodiment of a filter according to the present invention.
  • the filter of FIG. 3 comprises U-shaped resonators 1.
  • the first three U-shaped resonators 1 are arranged in staggered rows.
  • the fourth U-shaped resonator 1 has a base arranged on the same side as the third resonator 1.
  • the fourth resonator 1 as well as the fifth and the sixth are arranged symmetrically relative to the transverse axis 16 of the filter relative to the third, second and first U-shaped resonators 1.
  • the ends of the legs of each U-shaped resonator may be brought to ground (not shown in FIG. 3) .
  • the couplings between the first and second resonators 1, the second and third resonators 1, the fourth and fifth resonators 1 and the fifth and sixth resonators 1 are of the same type, the ends of the branches of U capable of be brought to ground being opposite to the axis 160.
  • the ends of the branches of the resonators likely to be grounded are on the same side of the axis 160.
  • the coupling between the third and the fourth resonators 1 is of a different type from those between the other resonators 1.
  • resonators 1 in U arranged symmetrically with respect to the transverse axis of the filter 16, having the bases on the same side of the filter. These bases are capable of being connected via, for example a capacitor so as to form a filter comprising two zones of high attenuation arranged symmetrically with respect to the central frequency of the filter.
  • the axis 16 is an axis of symmetry of the filter.
  • the barycenter of the filter constitutes the intersection of the axis 16 with a longitudinal axis 160 orthogonal to the axis 16.
  • FIG. 4 a second example of embodiment of a filter according to the present invention can be seen comprising resonators 1 in U.
  • the filter illustrated in FIG. 4 comprises ten resonators.
  • the first seven U-shaped resonators are staggered, as in a conventional filter.
  • the seventh and eighth resonators have arms arranged on the same side.
  • the last three U-shaped resonators, the eighth, the ninth and the tenth are staggered.
  • the filters of FIG. 3 and 4 are given as nonlimiting examples of the arrangements of the U-shaped resonators 1. Other arrangements such as, for example, those comprising several coupling changes do not depart from the scope of the present invention.
  • FIG. 5 a filter of the combline type according to the present invention can be seen.
  • the filters of FIG. 5 comprise a plurality of straight resonators at 10.
  • the straight resonators at 10 are arranged in parallel by one compared to others.
  • the first straight resonator at 10 is connected, by a first of these ends to ground 4 and by a second end to a first frame of a variable capacitor 5.
  • the second frame of the variable capacitor 5 is connected to ground 4.
  • the second straight resonator 10 is connected at a first end to a first armature of a variable capacitor 5; the second armature of the variable capacitor 5 is connected to ground 4; the second end of the right resonator 10 is connected to ground 4, etc ...
  • variable capacity capacitors 5 are thus more distant from each other than in a conventional filter type. Thus, the problem of space requirement of the capacitors with variable capacity 5 is solved and the parasitic coupling between these capacitors is reduced.
  • FIG. 6 one can see a filter according to the present invention making it possible to obtain two zones of strong attenuations, for example with respect to the central operating frequency of the filter. These zones of strong attenuations are also called zero of the filter.
  • the filters comprise eight U-shaped resonators 1 arranged symmetrically with respect to the transverse axis 16 of the filter.
  • the bases of the third and sixth resonators 1 in U are connected via a variable capacity capacitor 55.
  • the capacitor 55 makes it possible to adjust the response curve of the filter of FIG. 6.
  • resonators arranged symmetrically with respect to the transverse axis of the filter 16 can be connected via a capacitor 55.
  • each resonator 1 in U is connected to a first armature of a capacitor variable 5.
  • the second armature of the variable capacitor 5 is connected to ground 4.
  • connection of the base of the resonators 1 in U to the first armature of the capacitors with variable capacity 5 is carried out at the level of an axis of symmetry 15 of said resonator 1 in U.
  • the capacitors 5 are shown at outside the U formed by the resonator 1. It is understood that the variable capacitors 5 connected inside the U formed by the resonator 1 do not depart from the scope of the present invention.
  • variable capacity capacitors 5 allows fine adjustment of the filter.
  • the length L of the branches of the resonators 1 in U is less in the case of the device of FIG. 7 than that of the device of FIG. 1 or of FIG. 6.
  • L is less than ⁇ g / 8, ⁇ g being the wavelength guided at the center frequency of the filter.
  • the filters as illustrated in Figure 7 have a smaller footprint. This reduction in size is particularly important for the production of filters for on-board equipment, for example on board aircraft or satellites.
  • FIG. 8 an alternative embodiment of the device in FIG. 7 can be seen.
  • the U-shaped resonators 1 are connected by a transmission line 66, a variable capacity 77 being wired between the middle of this line 66 and the mass 4, the resonators in the case of the figure are respectively the third and the sixth resonators 1 in the form of U.
  • UHF frequency
  • band L the value of the capacity 55 becomes very weak.
  • capacity 77 remains more easily achievable.
  • FIG. 8 an exemplary embodiment has been illustrated in which a direct coupling 20 has been used as the connection means.
  • the direct coupling 20 is a metallization directly connected to the first and last resonators 1 in U.
  • the direct coupling 20 allows to solve the problem of realization of the couplings of the type of FIG. 7. In fact in the case of wide bandwidths the etching of the coupling space is very low ( ⁇ 100 ⁇ m).
  • the location of the branch of the U-shaped resonator to which the direct connection 20 is made is determined by calculation, for example using the specific software developed for determining the elements of the filter.
  • the connection at the end of metallization 20 constituting the direct coupling is made for example by means of a metallized hole 3. It is understood that the direct connection is not limited to the embodiment of FIG. 8 but can be used in all the embodiments of the filter according to the present invention.
  • the filters according to the present invention are produced in triplate technology.
  • An exemplary embodiment of a filter in triplate technology is illustrated in FIG. 9.
  • FIG. 9 corresponds to a detail of embodiment of the filter of FIG. 8 seen in section along the axis AA ⁇ .
  • the U-shaped resonators 1 are placed substantially in a plane included in a low loss dielectric 7. At least two faces of the dielectric are covered by a metallization constituting the ground plane 4.
  • the low loss dielectric 7 forms a rectangular parallelepiped whose six faces are covered by metallizations forming the ground plane 4 of said filter.
  • the vertical connections bear the references 13. They allow, on the one hand to connect the ends of the branches of the resonator 1 in U to the ground plane 4, and on the other hand to connect the variable capacitor 5 at the base of the resonators 1 in U.
  • the metallization of the ground plane 4 includes savings 9 avoiding short-circuiting the bases of the U-shaped resonators with the ground.
  • variable capacitors 5 are shown diagrammatically in FIG. 9.
  • the variable capacitors 5 will be installed for example on the surface of the filter according to the present invention.
  • the filter according to the present invention is enclosed in a hermetic casing, it is possible to allow the adjustment screws of the variable capacity capacitors 5 to protrude.
  • triplate technology is not limited to the embodiment of the filter according to the invention of FIG. 6.
  • the triplate technology can be applied to all the filters according to the present invention.
  • FIG. 12 we can see a symbolic representation of a second coupling between two resonators 1.
  • the coupling is carried out in FIG. 12 between two lines 30 and 31 corresponding, for example, to the coupling between the fourth and the fifth resonators in FIG. 8.
  • Line 30 has an input at point A and a connection to ground 4.
  • Line 31 has an output at point B located on the same side of line 31 as point A, and a connection to ground 4.
  • FIG. 13 we can see an equivalent diagram of a portion of the filter according to the present invention illustrated in FIG. 11 established from the book by Matthaei edition 1980, Microwaves Filters, Impedance Matching Networks and Coupling Structures.
  • a portion corresponding to two coupled branches of the two resonators 1 corresponds to a serial line 21 and two parallel lines 22 (stubs in English terminology) with an electrical angle ⁇ .
  • Line 21 with an electrical angle ⁇ corresponds to the coupling between two resonators.
  • the line 22 with an electrical angle ⁇ corresponds to the branches of the U-shaped resonators 1.
  • computer-aided design software for the realization of the filters. You can for example use CAD software, ESOPE, SUPERCOMPACT or TOUCHSTONE.
  • the translation is carried out by a computer to which the filter which one wishes to obtain is indicated.
  • FIG. 14 one can see an equivalent diagram of a portion of filter according to the present invention corresponding to the representation of FIG. 12.
  • the equivalent diagram of FIG. 14 differs from the equivalent diagram of FIG. 13 by the presence between the points A and B of a series 210 electric angle stub ⁇ .
  • the abscissa axis 47 we have plotted the frequency f.
  • the amplitude A has been plotted.
  • the ordinate axis 41 is for example an axis whose scale is logarithmic.
  • frequency response of the filter according to the present invention bears the reference 43.
  • This filter makes it possible to obtain two zeros centered on the frequencies 44 and 46, for example arranged symmetrically with respect to the central frequency 45 of the filter.
  • the filter zeros 44 and 46 will be by example superimposed on frequency side lobes in the electrical signal to be filtered, which would otherwise be very annoying.
  • the curve 43 is substantially vertical. On the greater part centered around the frequency 45 the curve 43 is substantially horizontal.
  • the technology according to the present invention can be used from high radio frequencies. Its effectiveness is particularly very important in the VHF, UHF and L band.
  • the invention applies mainly to the production of filters, in particular microwave filters and to the device using such filters.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP88400702A 1987-03-31 1988-03-23 Filter mit Elementen mit verteilten Parametern, wobei zwei Arten von Kopplungsvorrichtungen vorhanden sind Expired - Lifetime EP0285503B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704486A FR2613557A1 (fr) 1987-03-31 1987-03-31 Filtre comportant des elements a constantes reparties associant deux types de couplage
FR8704486 1987-03-31

Publications (2)

Publication Number Publication Date
EP0285503A1 true EP0285503A1 (de) 1988-10-05
EP0285503B1 EP0285503B1 (de) 1993-01-07

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EP88400702A Expired - Lifetime EP0285503B1 (de) 1987-03-31 1988-03-23 Filter mit Elementen mit verteilten Parametern, wobei zwei Arten von Kopplungsvorrichtungen vorhanden sind

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Country Link
US (1) US4992759A (de)
EP (1) EP0285503B1 (de)
JP (1) JPS63258101A (de)
DE (1) DE3877235T2 (de)
FR (1) FR2613557A1 (de)

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Publication number Priority date Publication date Assignee Title
FR2639776A1 (fr) * 1988-11-30 1990-06-01 Thomson Hybrides Filtre passif passe-bande
EP0373028A1 (de) * 1988-11-30 1990-06-13 Thomson Hybrides Passives Bandpassfilter
GB2246670A (en) * 1990-08-03 1992-02-05 Mohammad Reza Moazzam Microstrip filter
EP0589704A1 (de) * 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Mikrowellenfilter
EP0614241A1 (de) * 1993-03-03 1994-09-07 Lk-Products Oy Elektrischer Filter
EP0732762A1 (de) * 1995-03-15 1996-09-18 Robert Bosch Gmbh Planares Filter
FR2971651A1 (fr) * 2011-02-14 2012-08-17 Rockwell Collins France Filtre passe-bande a frequence variable
CN105470606A (zh) * 2015-12-29 2016-04-06 成都九洲迪飞科技有限责任公司 零点可调的带通滤波器
CN107732382A (zh) * 2017-09-07 2018-02-23 南京理工大学 一种Ku波段滤波器
US20190067772A1 (en) * 2017-05-11 2019-02-28 Eagantu Ltd. Tuneable band pass filter
US10454148B2 (en) 2017-05-11 2019-10-22 Eagantu Ltd. Compact band pass filter

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JP2827167B2 (ja) * 1988-09-07 1998-11-18 ジェイエスアール株式会社 熱可塑性樹脂組成物
DE3835480A1 (de) * 1988-10-18 1990-04-19 Fraunhofer Ges Forschung Hochfrequenz-bandpassfilter
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JP3633280B2 (ja) * 1998-05-29 2005-03-30 松下電器産業株式会社 半波長共振器型高周波フィルタ
DE10120507B4 (de) * 2000-04-27 2004-03-25 Kyocera Corp. Filter mit mehreren Elementen
WO2002041441A1 (en) * 2000-11-14 2002-05-23 Paratek Microwave, Inc. Hybrid resonator microstrip line filters
US6483404B1 (en) 2001-08-20 2002-11-19 Xytrans, Inc. Millimeter wave filter for surface mount applications
US6498551B1 (en) 2001-08-20 2002-12-24 Xytrans, Inc. Millimeter wave module (MMW) for microwave monolithic integrated circuit (MMIC)
US7236068B2 (en) * 2002-01-17 2007-06-26 Paratek Microwave, Inc. Electronically tunable combine filter with asymmetric response
JP2005520380A (ja) * 2002-03-08 2005-07-07 コンダクタス・インコーポレーテッド 共振器およびマイクロストリップフィルタのための結合方法および装置
US20030222732A1 (en) * 2002-05-29 2003-12-04 Superconductor Technologies, Inc. Narrow-band filters with zig-zag hairpin resonator
DE602004011489T2 (de) * 2003-03-19 2009-01-22 Nxp B.V. Mikrostreifenfilter kurzer länge
JP3926291B2 (ja) * 2003-05-12 2007-06-06 株式会社東芝 帯域通過フィルタ
CN100370651C (zh) * 2003-05-21 2008-02-20 海泰超导通讯科技（天津）有限公司 微波通讯用之接触式反平行发夹梳型滤波器
JP3998602B2 (ja) * 2003-05-21 2007-10-31 株式会社東芝 超伝導フィルタ
WO2005064738A1 (en) * 2003-09-18 2005-07-14 Conductus, Inc. Stripline filter utilizing one or more inter-resonator coupling members
US20050088258A1 (en) * 2003-10-27 2005-04-28 Xytrans, Inc. Millimeter wave surface mount filter
JP2007235435A (ja) * 2006-02-28 2007-09-13 Soshin Electric Co Ltd モジュール及び受動部品
JP2007281601A (ja) * 2006-04-03 2007-10-25 Toshiba Corp フィルタ回路及びフィルタ回路の特性調整方法
US7688162B2 (en) * 2006-11-16 2010-03-30 Harris Stratex Networks, Inc. Hairpin microstrip bandpass filter
US8680952B2 (en) * 2008-12-30 2014-03-25 Tdk Corporation Bandpass filter with dual band response
JP2011114633A (ja) * 2009-11-27 2011-06-09 Fujitsu Ltd アンテナ装置、及びアンテナ装置を含むシステム
JP5464545B2 (ja) * 2009-12-08 2014-04-09 独立行政法人国立高等専門学校機構 高周波帯域フィルタ及び通信装置並びにその調整方法
WO2012025946A1 (en) 2010-08-25 2012-03-01 Commscope Italy S.R.L. Tunable bandpass filter
TWI499123B (zh) * 2011-12-14 2015-09-01 矽品精密工業股份有限公司 交錯耦合帶通濾波器
CN104966872B (zh) * 2015-07-20 2018-11-20 成都顺为超导科技股份有限公司 一种传输零点可控的高温超导滤波器装置
CN106129557B (zh) * 2016-08-31 2019-02-22 中国电子科技集团公司第三十六研究所 一种交叉耦合带通滤波器
EP3996199B1 (de) * 2020-05-28 2023-05-10 Fujikura Ltd. Bandpassfilter

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639776A1 (fr) * 1988-11-30 1990-06-01 Thomson Hybrides Filtre passif passe-bande
EP0373028A1 (de) * 1988-11-30 1990-06-13 Thomson Hybrides Passives Bandpassfilter
GB2246670A (en) * 1990-08-03 1992-02-05 Mohammad Reza Moazzam Microstrip filter
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
EP0589704A1 (de) * 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Mikrowellenfilter
US5461352A (en) * 1992-09-24 1995-10-24 Matsushita Electric Industrial Co., Ltd. Co-planar and microstrip waveguide bandpass filter
EP0614241A1 (de) * 1993-03-03 1994-09-07 Lk-Products Oy Elektrischer Filter
US5543764A (en) * 1993-03-03 1996-08-06 Lk-Products Oy Filter having an electromagnetically tunable transmission zero
EP0732762A1 (de) * 1995-03-15 1996-09-18 Robert Bosch Gmbh Planares Filter
FR2971651A1 (fr) * 2011-02-14 2012-08-17 Rockwell Collins France Filtre passe-bande a frequence variable
CN105470606A (zh) * 2015-12-29 2016-04-06 成都九洲迪飞科技有限责任公司 零点可调的带通滤波器
CN105470606B (zh) * 2015-12-29 2018-07-03 成都九洲迪飞科技有限责任公司 零点可调的带通滤波器
US20190067772A1 (en) * 2017-05-11 2019-02-28 Eagantu Ltd. Tuneable band pass filter
US10454148B2 (en) 2017-05-11 2019-10-22 Eagantu Ltd. Compact band pass filter
US10581132B2 (en) * 2017-05-11 2020-03-03 Eagantu Ltd. Tuneable band pass filter
CN107732382A (zh) * 2017-09-07 2018-02-23 南京理工大学 一种Ku波段滤波器

Also Published As

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DE3877235D1 (de) 1993-02-18
JPS63258101A (ja) 1988-10-25
US4992759A (en) 1991-02-12
DE3877235T2 (de) 1993-05-06
FR2613557A1 (fr) 1988-10-07
EP0285503B1 (de) 1993-01-07

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