EP0114140B1 - Abstimmbarer Mikrowellenfilter mit dielektrischen Resonatoren im TM010 Modus - Google Patents

Abstimmbarer Mikrowellenfilter mit dielektrischen Resonatoren im TM010 Modus Download PDF

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Publication number
EP0114140B1
EP0114140B1 EP84400077A EP84400077A EP0114140B1 EP 0114140 B1 EP0114140 B1 EP 0114140B1 EP 84400077 A EP84400077 A EP 84400077A EP 84400077 A EP84400077 A EP 84400077A EP 0114140 B1 EP0114140 B1 EP 0114140B1
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EP
European Patent Office
Prior art keywords
resonators
filter
base
dielectric
guide
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Expired
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EP84400077A
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English (en)
French (fr)
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EP0114140A1 (de
Inventor
Jean-Luc Etienne
Jean-Claude Cruchon
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Alcatel Thomson Faisceaux Hertziens SA
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Alcatel Thomson Faisceaux Hertziens SA
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Priority to AT84400077T priority Critical patent/ATE41271T1/de
Publication of EP0114140A1 publication Critical patent/EP0114140A1/de
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    • 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
    • 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
    • H01P1/219—Evanescent mode filters

Definitions

  • the invention relates to the field of tunable microwave filters, and more particularly relates to a filter of this type with dielectric resonators, in which the resonators resonate according to the TM010 mode.
  • Tunable microwave filters with dielectric resonators developed up to now, however, have a certain number of drawbacks.
  • parasitic modes in these filters which can disturb their frequency responses.
  • tuning systems are provided for varying the tuning frequency of the resonators.
  • These systems generally comprise, associated with the resonators themselves, adjustable sinking dielectric rods. These elements allow tuning but they can degrade the overvoltage coefficient obtained when the resonator is alone.
  • these filters have always used selected modes TE018 or TM018 which have good no-load overvoltage coefficients. However, as indicated above these coefficients decrease in the complete system, with its means of agreement. Contrary to the generally accepted idea, these modes are not the only ones that can be implemented in dielectric resonators to produce filters with acceptable characteristics.
  • the subject of the invention is in fact a tunable microwave filter, with dielectric resonators operating according to the TM010 resonance mode.
  • a document of known art FR-A-1 496 177 describes a high frequency filter comprising a tube constituted by a conductive part at least at its inner surface part, and by several rods which are constituted by at least one conductive part to their surface parts and which have an electrical length equal to an integer multiple of a quarter wavelength chosen from the cut-off frequency band of the tube and which are arranged in the tube along the axis of that -this by cutting the axis.
  • the invention relates to a tunable microwave filter, with cylindrical resonators comprising a metal housing associated with a base also metallic forming a waveguide said under the cut-off and a series of cylindrical resonators arranged inside the housing, input and output coupling with the extreme resonators, these resonators having one of their ends in contact with the metal base, their other ends being at an adjustable distance from a ground plane formed by the bottom of the housing for achieve frequency tuning, characterized in that these resonators are dielectric resonators resonating according to the TM010 mode, in that the ends of these dielectric resonators in contact with the base are movable by sliding in first fixing holes provided for this effect in the base, and in that screws with adjustable penetration are arranged in second fixing holes provided in the base, in alternating with the first holes, to adjust the coupling between resonators.
  • the sub-assemblies which fit into a specific microwave material must be at low cost while retaining high performance.
  • the dielectric resonators in TM010 mode integrated to perform a filtering function, make it possible to obtain a gain compared to filters in evanescent, coaxial guided structure (comb filter or cross-digital filter), and compared to filters with dielectric resonators in TE01 ⁇ and TMOL X modes.
  • dielectric resonators in TM010 0 mode can be used in a very simple manner and associated with various but always simple tuning means which do not introduce disturbance in the resonance mode. In addition, there is no need for supports for the dielectric resonators.
  • FIG. 1 shows an embodiment of the microwave filter according to the invention in longitudinal section, this filter having a bandpass function.
  • This filter consists of three coupled dielectric resonators, 1, 2, 3, of cylindrical shape, the first and the last of these resonators being coupled to input 4 and output 5 means respectively.
  • these resonators are in contact with a metal base 6 to which they are fixed.
  • holes are provided in the base, the dielectric resonators being provided to slide in these holes.
  • holes can be lined with a small thickness of dielectric, for example polytetrafluoroethylene (teflon, under its trade name) from 2 to 7/100 e mm thick to avoid deterioration of the surface conditions during the sliding of the resonator.
  • dielectric for example polytetrafluoroethylene (teflon, under its trade name) from 2 to 7/100 e mm thick to avoid deterioration of the surface conditions during the sliding of the resonator.
  • a cover 7 forms, with the fixing base 6, a housing constituting a metal shielding enclosure forming a guide, the section of which can be any, for example rectangular, circular or reentrant.
  • the part of the resonator external to the guide can be coated with a coating of the glue or silver paint type.
  • the bottom of the housing is at a relatively small distance x from the ends of the resonators 1, 2 and 3, this distance being adjustable by driving the dielectric resonators 1, 2 and 3 inside the guide. The resonators can be blocked when the tuning frequency is obtained.
  • the dimensions of the housing are such that the guide thus formed has a cutoff frequency greater than the frequency at which the filter is used.
  • the guide which does not allow guided propagation, is said to be "under the cut".
  • the filtering function of this filter is obtained by locating the electromagnetic field in and near the dielectric resonators in the TM010 mode.
  • the coupling between successive resonators, which determines the passband of the filter, is obtained by an adequate distance of two successive resonators in the guide, and this coupling can be adjusted by metal screws, such as 8, for the adjustment of the susceptance of coupling between adjacent resonators.
  • the guide enters and exits through coaxial sockets, the external cylindrical end being fixed to the fixing base, and the internal conductor passing through this fixing base to form inside the guide an adjustable loop coupled on the magnetic field of each extreme resonator.
  • the tuning of this filter to the minimum frequency of the tuning frequency adjustment band takes place when the resonators are in contact with the bottom of the case.
  • Figure 2 is a cross-sectional representation of the microwave filter shown in Figure 1 at the dielectric resonator 1.
  • the field lines have been shown in this figure.
  • the electric field is located in and near the dielectric resonators, the magnetic field lines, orthogonal to the electric field lines forming circles whose centers are on the axis of the resonator, inside and outside the resonator.
  • the accesses 4 and 5 are made by coaxial sockets.
  • the coupling between these coaxial sockets and the resonators of the ends can also be achieved by antennas. Adjusting metal screws 8 make it possible to adjust the coupling between adjacent resonators.
  • the microwave resonators consist of zirconium titanate ZrTi0 4 to which tin Sn is added, in order to improve the temperature coefficient.
  • the first spurious response is rejected around 3.4 to 3.7 GHz.
  • the frequency tuning is obtained by varying the effective length of the resonator inside the guide and this frequency can vary between 2 and 2.5 GHz for example.
  • This structure also makes it possible to produce notch filters. In this case the coupling of the resonators with an electric line provided inside the guide, longitudinally, is carried out by the ends of the resonators.
  • the input and output couplings can be carried out by guide, the ends of the guide forming the enclosure of the filter being open to make the connection.
  • the input and output can be coupled differently, one by guide, the other by coaxial socket.
  • the shape of the guide can be any, line guide, U-shaped guide or guide having the shape of a crown.
  • the arrangement in U allows for example to provide retro-couplings between nonadjacent resonators to modulate the response of the filter. It is also possible to associate several filters, for example in parallel, coupled to a common access as a guide for producing a diplexer or a multiplexer.
  • the main advantage of the microwave filter according to the invention is the simplicity of its structure.
  • due to the mode itself there is no parasitic mode close to the response of the filter.

Claims (6)

1. Abstimmbares Mikrowellenfilter mit zylindrischen Resonatoren, welches ein metallisches Gehäuse (7), das mit einem ebenfalls metallischen Sockel (6) verbunden ist und einen Wellenleiter "unter der Grenzfrequenz" bildet, eine Reihe zylindrischer Resonatoren (1, 2, 3) im Inneren des Gehäuses und Eingangs- und Ausgangskopplungsmittel (4 bzw. 5) für die äußersten Resonatoren aufweist, wobei diese Resonatoren (1, 2, 3) mit einem ihrer Enden in Kontakt mit dem Metallsockel (6) stehen, während sich ihre anderen Enden in einem zur Frequenzabs timmung eins teilbaren Abstand x zu einer Massefläche befinden, die durch den Boden des Gehäuses gebildet wird, dadurch gekennzeichnet, daß diese Resonatoren (1, 2, 3) dielektrische Resonatoren sind, die im TM010-Modus schwingen, daß die Enden dieser mit dem Sockel in Kontakt stehenden dielektrischen Resonatoren (1, 2, 3) durch Verschiebung in ersten, zu diesem Zweck im Sockel (6) angebrachten Löchern verstellbar sind, und daß Schrauben (8) mit einstellbarer Eindringtiefe in zweiten, im Sockel vorgesehenen Löchern angebracht sind, die mit den ersten Löchern abwechseln und der Abstimmung der Kopplung zwischen den Resonatoren dienen.
2. Filter nach Anspruch 1, dadurch gekennzeichnet, daß die Partie jedes Resonators außerhalb des Wellenleiters mit einer Schicht aus Leim oder Silberfarbe bestrichen ist, um die Mikrowellenverluste zu verringern.
3. Filter nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die dielektrischen Resonatoren aus Zirkoniumtitanat (ZrTi04) bestehen, dem Zinn Sn zur Verbesserung des Temperaturkoeffizienten beigefügt ist.
4. Filter nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet daß die ersten Befestigungslöcher mit einer dielektrischen Beschichtung geringer Dicke ausgekleidet sind, um eine Verschlechterung der Oberflächenqualität aufgrund der Verschiebung des Resonators zu verhindern.
5. Filter nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kopplungsmittel zu den äußeren Resonatoren aus Drahtkoppelschleifen (9) einstellbarer Länge bestehen.
6. Filter nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß es eine im Inneren des Wellenleiters in Längsrichtung laufende elektrische Leitung besitzt, die an die Enden der Resonatoren derart angekoppelt ist, daß ein Sperrfilter gebildet wird.
EP84400077A 1983-01-19 1984-01-13 Abstimmbarer Mikrowellenfilter mit dielektrischen Resonatoren im TM010 Modus Expired EP0114140B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400077T ATE41271T1 (de) 1983-01-19 1984-01-13 Abstimmbarer mikrowellenfilter mit dielektrischen resonatoren im tm010 modus.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8300755 1983-01-19
FR8300755A FR2539565A1 (fr) 1983-01-19 1983-01-19 Filtre hyperfrequence accordable, a resonateurs dielectriques en mode tm010

Publications (2)

Publication Number Publication Date
EP0114140A1 EP0114140A1 (de) 1984-07-25
EP0114140B1 true EP0114140B1 (de) 1989-03-08

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EP84400077A Expired EP0114140B1 (de) 1983-01-19 1984-01-13 Abstimmbarer Mikrowellenfilter mit dielektrischen Resonatoren im TM010 Modus

Country Status (6)

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US (1) US4578655A (de)
EP (1) EP0114140B1 (de)
AT (1) ATE41271T1 (de)
CA (1) CA1207853A (de)
DE (1) DE3477104D1 (de)
FR (1) FR2539565A1 (de)

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JPS62204601A (ja) * 1986-03-04 1987-09-09 Murata Mfg Co Ltd 二重モ−ドフイルタ
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FR2661042B1 (fr) * 1990-04-12 1992-08-14 Tekelec Airtronic Sa Arrangement de filtre haute frequence comportant au moins un filtre a frequence variable.
US5532210A (en) * 1994-06-08 1996-07-02 E. I. Du Pont De Nemours And Company High temperature superconductor dielectric slow wave structures for accelerators and traveling wave tubes
DE19629593A1 (de) * 1996-07-23 1998-01-29 Endress Hauser Gmbh Co Anordnung zum Erzeugen und zum Senden von Mikrowellen, insb. für ein Füllstandsmeßgerät
US5808528A (en) * 1996-09-05 1998-09-15 Digital Microwave Corporation Broad-band tunable waveguide filter using etched septum discontinuities
JP3161343B2 (ja) * 1996-10-30 2001-04-25 株式会社村田製作所 フィルタ装置
EP1122807B1 (de) * 1999-08-20 2006-02-15 Kabushiki Kaisha Tokin Dielektrischer resonator und dielektrisches filter
JP3506124B2 (ja) * 2001-02-28 2004-03-15 株式会社村田製作所 フィルタ装置、デュプレクサおよび基地局用通信装置
US6507252B1 (en) 2001-06-21 2003-01-14 Thinh Q. Ho High rejection evanescent MIC multiplexers for multifunctional systems
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EP1372212A1 (de) * 2002-06-12 2003-12-17 Matsushita Electric Industrial Co., Ltd. Dielektrischer Resonator und zugehöriges Hochfrequenz-Schaltungselement
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CN112072259A (zh) * 2019-06-11 2020-12-11 中兴通讯股份有限公司 介质谐振器
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Also Published As

Publication number Publication date
DE3477104D1 (en) 1989-04-13
EP0114140A1 (de) 1984-07-25
ATE41271T1 (de) 1989-03-15
FR2539565A1 (fr) 1984-07-20
US4578655A (en) 1986-03-25
CA1207853A (en) 1986-07-15
FR2539565B1 (de) 1985-04-05

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