EP0346806A1 - Bandpassfilter mit dielektrischen Resonatoren - Google Patents

Bandpassfilter mit dielektrischen Resonatoren Download PDF

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Publication number
EP0346806A1
EP0346806A1 EP89110612A EP89110612A EP0346806A1 EP 0346806 A1 EP0346806 A1 EP 0346806A1 EP 89110612 A EP89110612 A EP 89110612A EP 89110612 A EP89110612 A EP 89110612A EP 0346806 A1 EP0346806 A1 EP 0346806A1
Authority
EP
European Patent Office
Prior art keywords
guide
filter according
resonators
dielectric
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.)
Granted
Application number
EP89110612A
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English (en)
French (fr)
Other versions
EP0346806B1 (de
Inventor
Marc Sauvage
Catherine Simon
Robert Le Roux
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 Transmission par Faisceaux Hertziens 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 Transmission par Faisceaux Hertziens SA, Alcatel NV filed Critical Alcatel Telspace SA
Publication of EP0346806A1 publication Critical patent/EP0346806A1/de
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Publication of EP0346806B1 publication Critical patent/EP0346806B1/de
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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

Definitions

  • the invention relates to a bandpass filter with dielectric resonators.
  • the invention relates more particularly to a microwave bandpass filter using dielectric resonators resonating in TE011 mode: These dielectric resonators are placed in a guide used at its cutoff frequency.
  • connection filters are needed to select the different channels in a given band (for example from 7.1 to 7.7 GHz).
  • the filters must therefore be tunable in each of the channels included in the band.
  • EP-0 176 966 describes a bandpass filter in which several dielectric resonators are arranged in alignment, two metal studs of length little different from a quarter of the wavelength of the central frequency of the filter being positioned at two ends of the filter; one between the first resonator and the input connector, the other between the last resonator and the output connector.
  • EP-0 209 878 describes a microwave filter with dielectric resonators in which a metal base plate supports several resonators, an input coupling element and an output coupling element, an input connector and an output connector, this plate being protected by a cover provided with a cavity to thereby form a waveguide.
  • the object of the invention is to eliminate these various drawbacks as much as possible.
  • the invention provides for this purpose a bandpass filter with dielectric resonators comprising a microwave guide, in which the dielectric resonators are arranged, characterized in that each dielectric resonator is integral with a support made of dielectric material making it possible to modify the position of the corresponding resonator in the guide, and in that said filter comprises at least one screw producing an adjustable "mode suppressor" placed parallel to the supports of the dielectric resonators.
  • the same mechanics are used for each of the channels, by only changing the height of the dielectric resonators. Indeed, their diameter remains constant whatever the channels to be covered in the strip, only their height varies according to the channel used. The overvoltage of the resonators is no longer optimum but the differences observed in the losses of the filters, according to the channels, are negligible.
  • the filter according to the invention is composed: - a one-piece guide, - guide access, - at least two dielectric resonators, - of resonator supports, of threaded dielectric material, - elastic washers and nuts for locking the position of each support, - threaded metal sleeves allowing the passage of the dielectric resonators in the guide, - locking nuts to hold the sleeves, - a metal bottom closing the guide, held by screws, - screws with locking nut allowing adjustment of the coupling between resonators, placed perpendicular to the supports of dielectric resonators, - a coaxial access forming an antenna in order to excite the adjacent resonator, - and a screw with its locking nut to adjust the coupling between the antenna and the adjacent resonator.
  • the filter according to the invention is composed: a guide 10, for example in one piece, made for example from extruded aluminum covered with a thin layer of silver (around 10 ⁇ m) to reduce electrical losses, - access to guide 11, for example a standard flange screwed onto guide 10 using screws 9, - at least two dielectric resonators 13, - supports 14 of resonators, made of dielectric material such as polypenco or rexolite, threaded, - elastic washers 15 and locking nuts 16 for the position of each support 14, - threaded metal sleeves 17 allowing the passage of the dielectric resonators 13 in the guide 10, - locking nuts 18 to hold the sleeves 17, - a metal bottom 19 closing the guide, held by screws 20, - At least one screw 21 with its locking nut 22 making a "mode suppressor", placed parallel to the supports 14 of the dielectric resonators, - of screw 23 with locking nut 24 allowing adjustment of the coupling between resonators, placed perpendicular to
  • the frequency difference ( ⁇ f) corresponding to the resonance of the two dielectric resonators is measured.
  • the ⁇ f is directly linked to the value of the coupling coefficient: (see “MICROWAVE FILTERS IMPEDANCE-MATCHING, NETWORKS AND COUPLING STRUCTURES" by: G. MATTHAEI, L. YOUNG, E.N.T. JONES ARTECH HOUSE BOOKS pages 666-667).
  • the dielectric resonators 13 are fixed on their support 14, for example by gluing.
  • the latter is made of dielectric material, having a low relative permittivity ⁇ r as well as a good loss tangent ⁇ ; it can be for example: polypenco, rexolite ...
  • This support 14 is threaded, which makes it possible to modify the position of the dielectric resonators 13 in the guide 10. It is thus possible to adjust the resonant frequency of each dielectric resonator by keeping him away or by bringing it closer to a wall of the guide.
  • the support 14 is screwed into a metal sleeve 17 itself threaded and screwed into the wall of the guide 10.
  • the wall of the guide is artificially removed and, thus, the resonance frequency of the dielectric resonator is reduced.
  • a locking nut 18 comes to hold the sleeve 17, once the filter has been adjusted. In this way, the filter tuning frequency can be varied from fo ⁇ 20 MHz, without degrading the characteristics of the filter. Under no circumstances should the sleeve 17 enter the guide 10.
  • this sleeve 17 has a diameter greater than that of the dielectric resonators, making it possible to mount them in the guide 10.
  • the guide 10 can therefore be in one piece and all the problems inherent in the two-part guide are eliminated, with regard in particular to : - bad contacts between the guide and its cover, - additional losses, - the additional manufacturing cost.
  • Another aspect of the invention relates to the suppression of parasitic responses (or higher modes). Indeed, although one does not introduce metal adjusting screws into the guide to adjust the resonant frequency of the dielectric resonators, the latter resonate in many modes beyond the TE011 mode. To overcome this defect, it is known to reduce the interior height of the guide in order to have the highest possible cutoff frequency. However, if one does not want to degrade the filter overvoltage, the interior height of the guide must be approximately twice the height of the dielectric resonators. Under these conditions, the parasitic modes are not sufficiently attenuated.
  • mode suppressors ("Mode suppressor for dielectric resonator filter” of CL REN, IEEE MTTS DIGEST 1982 p. 389), which consist in inserting a thin metal plate between two dielectric resonators crossing the guide in his height. Such a plate is held by dielectric supports.
  • This system has two drawbacks: - It is very difficult to introduce these "mode suppressors” into the guide during mass production, - the dielectric for holding plates inevitably creates additional losses.
  • this plate is replaced by at least one screw 21 placed between two dielectric resonators, in an axis parallel to their supports ,.
  • This assembly is simple, inexpensive and does not introduce a dielectric in the guide.
  • the effectiveness of the attenuation of the higher modes can be increased by creating an end capacitance between the end of the screw 21 and the top of the guide 10.
  • the filter 10 has a guide access 11 and a coaxial access 25. These two accesses can be either in guide or in coaxial.
  • the height of the adjacent dielectric resonator must be increased so that its resonant frequency is approximately 20 MHz lower than the filter adjustment frequency.
  • the antenna 26 has the effect of increasing the resonant frequency of this dielectric resonator because it approaches the metal near the latter.
  • a screw 27 is introduced into the flange, in order to adjust the input coupling. This screw 27 is in the same plane as the other coupling screws 23 ..
  • the guide 10 is in one piece but can also be produced in several parts, in different metals.
  • the maximum number of 21 "mode suppressor screws is n-1 if n is the number of dielectric resonators making up the filter. But such a number is not necessary because the influence of the additional screws becomes negligible on the attenuation parasitic responses while the level of losses due to these screws tends to become significant.
  • the curve, shown in Figure 9, shows this filter with three "mode suppressor” screws, without contact with the top of the guide: this time we adjust the "mode suppressor” screws to further reduce spurious responses, we use the end capacity of these screws.
  • the responses between 10 GHz and 12 GHz are attenuated by 10dB compared to the case of FIG. 8, those around 13.2 GHz are attenuated by 40dB and those around 15.5 GHz are attenuated by 20dB. Note that the attenuation of the two harmony in the band 7.1-7.9 GHz is greater than 60dB (band 14 to 16 GHz).

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EP19890110612 1988-06-17 1989-06-12 Bandpassfilter mit dielektrischen Resonatoren Expired - Lifetime EP0346806B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808140 1988-06-17
FR8808140A FR2633118A1 (fr) 1988-06-17 1988-06-17 Filtre passe-bande a resonateurs dielectriques

Publications (2)

Publication Number Publication Date
EP0346806A1 true EP0346806A1 (de) 1989-12-20
EP0346806B1 EP0346806B1 (de) 1993-12-29

Family

ID=9367417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890110612 Expired - Lifetime EP0346806B1 (de) 1988-06-17 1989-06-12 Bandpassfilter mit dielektrischen Resonatoren

Country Status (3)

Country Link
EP (1) EP0346806B1 (de)
DE (1) DE68911760D1 (de)
FR (1) FR2633118A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001658A1 (en) * 1993-07-02 1995-01-12 Siemens Telecomunicazioni S.P.A. Tunable resonator for microwave oscillators and filters
US5808528A (en) * 1996-09-05 1998-09-15 Digital Microwave Corporation Broad-band tunable waveguide filter using etched septum discontinuities
ES2124183A1 (es) * 1996-12-20 1999-01-16 Alsthom Cge Alcatel Filtro de microondas con resonador dielectrico

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1190495A (en) * 1968-05-23 1970-05-06 Standard Telephones Cables Ltd Improvements in or relating to Waveguide Filters
FR2355403A1 (fr) * 1976-06-14 1978-01-13 Murata Manufacturing Co Filtre electrique de branchement
EP0035922A1 (de) * 1980-03-04 1981-09-16 Thomson-Csf Abstimmungsvorrichtung mit veränderbarer Kapazität und abstimmbares Mikrowellenfilter mit wenigstens einer solchen Vorrichtung
EP0047203A1 (de) * 1980-08-29 1982-03-10 Thomson-Csf Über eine grosse Bandbreite abstimmbares Mikrowellenfilter mit einem dielektrischen Resonator
WO1987000350A1 (en) * 1985-07-08 1987-01-15 Ford Aerospace & Communications Corporation Narrow bandpass dielectric resonator filter
EP0209878A1 (de) * 1985-07-22 1987-01-28 Nec Corporation Filter mit dielektrischen Resonatoren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1190495A (en) * 1968-05-23 1970-05-06 Standard Telephones Cables Ltd Improvements in or relating to Waveguide Filters
FR2355403A1 (fr) * 1976-06-14 1978-01-13 Murata Manufacturing Co Filtre electrique de branchement
EP0035922A1 (de) * 1980-03-04 1981-09-16 Thomson-Csf Abstimmungsvorrichtung mit veränderbarer Kapazität und abstimmbares Mikrowellenfilter mit wenigstens einer solchen Vorrichtung
EP0047203A1 (de) * 1980-08-29 1982-03-10 Thomson-Csf Über eine grosse Bandbreite abstimmbares Mikrowellenfilter mit einem dielektrischen Resonator
WO1987000350A1 (en) * 1985-07-08 1987-01-15 Ford Aerospace & Communications Corporation Narrow bandpass dielectric resonator filter
EP0209878A1 (de) * 1985-07-22 1987-01-28 Nec Corporation Filter mit dielektrischen Resonatoren

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001658A1 (en) * 1993-07-02 1995-01-12 Siemens Telecomunicazioni S.P.A. Tunable resonator for microwave oscillators and filters
AU681900B2 (en) * 1993-07-02 1997-09-11 Siemens Telecomunicazioni S.P.A. Tunable resonator for microwave oscillators and filters
US5691677A (en) * 1993-07-02 1997-11-25 Italtel Spa Tunable resonator for microwave oscillators and filters
CN1039266C (zh) * 1993-07-02 1998-07-22 西门子电信公司 用于微波滤波器的可调谐振腔
US5808528A (en) * 1996-09-05 1998-09-15 Digital Microwave Corporation Broad-band tunable waveguide filter using etched septum discontinuities
ES2124183A1 (es) * 1996-12-20 1999-01-16 Alsthom Cge Alcatel Filtro de microondas con resonador dielectrico

Also Published As

Publication number Publication date
FR2633118A1 (fr) 1989-12-22
EP0346806B1 (de) 1993-12-29
DE68911760D1 (de) 1994-02-10

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