EP0443481B1 - Abstimmbarer Mikrowellenfilter - Google Patents

Abstimmbarer Mikrowellenfilter Download PDF

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Publication number
EP0443481B1
EP0443481B1 EP91102262A EP91102262A EP0443481B1 EP 0443481 B1 EP0443481 B1 EP 0443481B1 EP 91102262 A EP91102262 A EP 91102262A EP 91102262 A EP91102262 A EP 91102262A EP 0443481 B1 EP0443481 B1 EP 0443481B1
Authority
EP
European Patent Office
Prior art keywords
filter
resonator
ferrite
dielectric
agile
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
EP91102262A
Other languages
English (en)
French (fr)
Other versions
EP0443481A1 (de
Inventor
Carol Brouzes
Claude Ressencourt
Alain De Place
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 CIT SA
Alcatel Lucent NV
Original Assignee
Alcatel Telspace SA
Alcatel NV
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 Alcatel Telspace SA, Alcatel NV filed Critical Alcatel Telspace SA
Publication of EP0443481A1 publication Critical patent/EP0443481A1/de
Application granted granted Critical
Publication of EP0443481B1 publication Critical patent/EP0443481B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric 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
    • H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

Definitions

  • the present invention relates to an agile microwave filter, and in particular to a filter of this type suitable for use, both on transmission and on reception, for the production of frequency-agile radio-relay systems.
  • An agile filter is a filter whose central frequency can be voluntarily moved, in a range of frequencies which can cover a large fraction of an octave, by means of an electric or electronic control.
  • Such filters are, with frequency synthesizers, the essential elements for producing agile radio-relay systems, which are in particular widely used in applications where it is desired to be able to very quickly change the frequency of emission of a signal.
  • the most conventional agile filter is the resonant cavity filter, the tuning of which is carried out mechanically under the control of a motor.
  • This type of filter can withstand high powers, but it can no longer be suitable in current applications because its operating time to achieve a frequency change is extremely high, of the order of a minute to fix ideas, while some Projected applications will require a channel switching time much less than a second, and more specifically on the order of a millisecond.
  • they have the other disadvantages of being bulky, rather heavy, and particularly expensive and complex to produce because of the delicate and precise mechanical requirements which are to be implemented.
  • variable capacity diodes or "varactors” which react in a very short time, typically of the order of a microsecond.
  • variable capacity diodes or "varactors”
  • Such filters cannot be envisaged, for radio-relay systems, because of their acceptable power which is much too low (less than 0 dBm), as well as their operating frequency which is, with the components currently known, limited to frequencies below 2 Gigahertz.
  • the document FR-A-2.521.786 describes, with reference to the document FR-A-2.509.537, a bandpass filter with dielectric resonators placed in a waveguide whose dimensions of the cross section are about 2.5 times the transverse dimensions of these resonators.
  • a Yttrium iron garnet tablet is placed on each of these dielectric resonators in order, under the action of adjustable external magnetic fields, to make this filter magnetically tunable.
  • the air gap of the magnetic circuits necessary for the creation of these magnetic fields is then very large, so that the number of amperes turns, and therefore the necessary current consumption, are very high to obtain a satisfactory range of variation.
  • the production of such composite resonators is quite expensive, precisely because of this composite character.
  • the document FR-A-2,610,766 of the Applicant describes a power resonator made up at least partially of polycrystalline ferrite, and whose tuning is changed very quickly by the application of an adjustable external magnetic field.
  • the technique presented in this document is based on the use of a resonant coaxial line produced from a cylindrical bar of metallized polycrystalline ferrite.
  • This ferrite resonator is placed in a device capable of creating a variable magnetic field. The latter then varies the magnetic permeability of the ferrite material so as to modify the electrical length of the coaxial line, thereby varying the frequency of this resonator.
  • the invention aims to remedy these various drawbacks. It relates for this purpose to an agile microwave filter whose structure is similar to that of filters with dielectric resonator (s) placed (s) for example in a waveguide operating under the cutoff, but for which the or the dielectric confinement resonators are replaced by similar resonators, but made of ferrite material and not of purely dielectric material, means being moreover provided for applying to this or these ferrite resonators a magnetic field of adjustable intensity, so as to move the center frequency of the filter.
  • the subject of the present invention is an agile microwave filter comprising at least one resonator (1, 15, 16) with dielectric confinement as well as means (11, 11A, 11B, 17) for applying magnetic fields (H1, H2 , H3) of adjustable intensity, characterized in that said dielectric confinement resonator (1, 15, 16) is made of ferrite material and arranged on the bottom of a waveguide operating in evanescent mode, in order to obtain a displacement of the central frequency of this filter by adjusting the intensity of said magnetic fields.
  • the agile microwave filter further comprises a thin dielectric pad (14), and said dielectric confinement resonator (1, 15, 16) made of ferrite material is placed on said thin dielectric pad which is itself - even placed on said bottom of said waveguide.
  • this agile microwave filter is composed of a ferrite cylinder 1, of diameter D and height h which, like filters with dielectric resonator (s) of the art known, is placed on the bottom of a portion 2 of section guide rectangular and operating in evanescent mode, that is to say under the cut.
  • the ferrite bar 1 operates in TM 01 ⁇ mode, while the guide in evanescent mode 2 is excited according to TM11 mode by a coaxial antenna 3 placed at the input of the filter and conventionally passing through a first metal end plate 4.
  • the input microwave signal is conveyed to this antenna 3 by the coaxial cable for supplying the signal 5.
  • the filter output signal is taken from the other end of the guide 2 by the coaxial antenna 6 which likewise crosses the second metal end plate 7, this antenna 6 conventionally extending the cable core coaxial output 8 (in the same way as the antenna 3 extends, for its part, the core of the coaxial input cable 5).
  • Ferrite bar 1 has the property, currently rather misunderstood, of having not only a high magnetic permeability, but also a rather high dielectric permittivity, its relative permittivity being of the order of 15, while that of resonator materials conventional dielectric is of the order of 40. It follows that, contrary to what one might think a priori, the bar 1 realizes here, without it being, like that of document FR-A-2,610,766 , shielded by two concentric metallic layers, a dielectric confinement giving it a resonator function.
  • the resonance frequency of the ferrite rod 1 depends on the product of its dielectric permittivity by its magnetic permeability, so that in fact it will be possible to vary the resonance frequency of the bar 1, and therefore the central tuning frequency of the filter of Figure 1 by varying this magnetic permeability which, for ferrite material, is possible by applying to it a polarizing magnetic field of adjustable intensity, like what is described in the document FR-A-2,610,766 cited above.
  • the ferrite bar 1 is also placed in a magnetic field H which is created, coaxially with the bar 1, between the two pole pieces 9, 10 of an electromagnet 11 comprising a soft iron magnetic circuit 12 and an excitation coil 13 traversed by a direct current of adjustable value: by varying the excitation current of the coil 13, the value of the field H is varied, and consequently the resonance frequency of the bar 1, this which moves the center frequency of the filter.
  • the magnetic conduction property of the rod 1 combined with its non-negligible height h, causes the magnetic circuit 12 to have a fairly small air gap, which makes it possible to vary this field H, and therefore to shift the central frequency of the filter in good proportions without requiring, for the windings 13, excessive current consumption.
  • the central frequency of the microwave filter according to FIGS. 1 or 2 could be continuously displaced between 14,450 Gigahertz and 15,447 Gigahertz without excessive current consumption in these windings.
  • FIG. 3 shows the production of an agile band-pass filter formed by the association, in the same guide 2, of two ferrite resonators 15 and 16 also operating as resonators with dielectric confinement, this filter being basically similar to conventional band filters with dielectric resonators (see for example FIG. 1 of the document FR-A-2,590,537 cited above) except that the coupled resonators 15, 16 are made of ferrite and that in addition they are subjected, like the resonator 1 according to FIGS. 1 and 2, with the respective adjustable magnetic fields H1 and H2 created by the electromagnets 11 A and 11 B.
  • the coils 13 A and 13 B of these electromagnets 11 A and 11 B are each supplied with excitation current adjustable by a supply and control unit 17.
  • the invention is not limited to the exemplary embodiments which have just been described.
  • the relative dimensions of the resonators and of the guide could be different.
  • Other input and output coupling modes for example produced using iris, could be used, in which case the guide used could not operate in evanescent mode, etc.
  • the circuits electromagnets can, without departing from the scope of the invention, include permanent magnets contributing to the creation of the magnetic field.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Gyroscopes (AREA)

Claims (4)

  1. Justierbares Mikrowellenfilter, das mindestens einen Resonator (1, 15, 16) mit dielektrischer Einschließung enthält, der am Grund eines im abklingenden Modus betriebenen Wellenleiters liegt, sowie Mittel (11, 11A, 11B, 17) aufweist, um magnetische Felder (H1, H2, H3) justierbarer Stärke anlegen zu können, dadurch gekennzeichnet, daß der Resonator (1, 15, 16) mit dielektrischer Einschließung aus Ferritmaterial gebildet wird, um eine Verschiebung der Mittenfrequenz dieses Filters durch Regelung der Stärke dieser Magnetfelder zu erzielen.
  2. Justierbares Filter nach Anspruch 1, dadurch gekennzeichnet, daß es außerdem ein dünnes dielektrisches Plättchen (14) aufweist und daß der aus Ferritmaterial bestehende Resonator (1, 15, 16) mit dielektrischer Einschließung auf dem dünnen dielektrischen Plättchen liegt, das seinerseits auf dem Grund des Wellenleiters liegt.
  3. Justierbares Filter nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß der Ferritresonator (1, 15, 16) auf dem Grund des Wellenleiters (2) liegt.
  4. Justierbares Filter nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß der Ferritresonator (1) auf einem dünnen dielektrischen Plättchen (14) liegt, das seinerseits auf dem Grund des Wellenleiters (2) liegt.
EP91102262A 1990-02-23 1991-02-18 Abstimmbarer Mikrowellenfilter Expired - Lifetime EP0443481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9002280 1990-02-23
FR9002280A FR2658954B1 (fr) 1990-02-23 1990-02-23 Filtre agile hyperfrequence.

Publications (2)

Publication Number Publication Date
EP0443481A1 EP0443481A1 (de) 1991-08-28
EP0443481B1 true EP0443481B1 (de) 1995-06-21

Family

ID=9394080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102262A Expired - Lifetime EP0443481B1 (de) 1990-02-23 1991-02-18 Abstimmbarer Mikrowellenfilter

Country Status (8)

Country Link
US (1) US5184097A (de)
EP (1) EP0443481B1 (de)
JP (1) JPH0537202A (de)
CA (1) CA2036829C (de)
DE (1) DE69110494T2 (de)
ES (1) ES2074180T3 (de)
FR (1) FR2658954B1 (de)
IL (1) IL97205A (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694452B1 (fr) * 1992-07-30 1994-09-02 Alcatel Telspace Filtre passe-bande agile pour hyperfréquences.
US5440278A (en) * 1994-03-25 1995-08-08 Bartholomew; Darin Ferrite system for modulating, phase shifting, or attenuating radio frequency energy
ES2148042B1 (es) 1997-07-30 2001-05-01 Mecanismos Aux Es Ind S L Perfeccionamientos en las maquinas encintadoras.
US5959512A (en) * 1997-09-19 1999-09-28 Raytheon Company Electronically tuned voltage controlled evanescent mode waveguide filter
EP0915528A3 (de) * 1997-11-07 1999-08-11 Nec Corporation Hochfrequenzfilter und Verfahren zur Regelung seiner Frequenzcharakteristika
US8149073B2 (en) * 2007-08-03 2012-04-03 Murata Manufacturing Co., Ltd. Band-pass filter and method for making photonic crystal for the band-pass filter
US10181632B2 (en) * 2013-12-18 2019-01-15 Skyworks Solutions, Inc. Tunable resonators using high dielectric constant ferrite rods
CN114361754B (zh) * 2022-01-10 2022-10-14 电子科技大学 一种x波段磁控频率可调的定向耦合器

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2948868A (en) * 1955-11-14 1960-08-09 Bell Telephone Labor Inc Frequency sensitive electromagnetic wave device
US3001154A (en) * 1959-01-22 1961-09-19 Reggia Frank Electrically tuned microwave bandpass filter using ferrites
GB1190547A (en) * 1969-03-05 1970-05-06 Standard Telephones Cables Ltd Improvements in Electrical Waveguide Arrangements
SU1319117A1 (ru) * 1971-07-20 1987-06-23 Предприятие П/Я А-1216 Гиромагнитный полосовой фильтр
GB1340162A (en) * 1972-02-10 1973-12-12 Standard Telephones Cables Ltd Waveguide filter
US3919673A (en) * 1974-06-05 1975-11-11 Bell Telephone Labor Inc Nonreciprocal absorption filter
US4122418A (en) * 1975-05-10 1978-10-24 Tsukasa Nagao Composite resonator
JPS52153360A (en) * 1976-06-14 1977-12-20 Murata Manufacturing Co Filter using dielectric resonator
FR2521786A2 (fr) * 1981-02-27 1983-08-19 Thomson Csf Filtre passe-bande a resonateurs dielectriques
FR2539565A1 (fr) * 1983-01-19 1984-07-20 Thomson Csf Filtre hyperfrequence accordable, a resonateurs dielectriques en mode tm010
JPS61201503A (ja) * 1985-03-05 1986-09-06 Tdk Corp 磁性体共振器
JPH06105844B2 (ja) * 1985-03-29 1994-12-21 富士通株式会社 誘電体フイルタ
JPS6276301A (ja) * 1985-09-27 1987-04-08 Murata Mfg Co Ltd 共振装置
SU1385164A1 (ru) * 1986-01-14 1988-03-30 Новосибирский электротехнический институт связи им.Н.Д.Псурцева Перестраиваемый фильтр
FR2610766B1 (fr) * 1987-02-11 1989-02-17 Alcatel Thomson Faisceaux Filtre hyperfrequence, accordable electroniquement
JPH02186802A (ja) * 1989-01-13 1990-07-23 Murata Mfg Co Ltd 静磁波フィルタ

Also Published As

Publication number Publication date
CA2036829C (fr) 1994-09-20
US5184097A (en) 1993-02-02
FR2658954A1 (fr) 1991-08-30
IL97205A (en) 1994-01-25
IL97205A0 (en) 1992-05-25
EP0443481A1 (de) 1991-08-28
ES2074180T3 (es) 1995-09-01
DE69110494T2 (de) 1995-11-09
CA2036829A1 (fr) 1991-08-24
DE69110494D1 (de) 1995-07-27
FR2658954B1 (fr) 1992-10-02
JPH0537202A (ja) 1993-02-12

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