EP0871235A2 - Filtre hyperfréquence avec des éléments de couplage - Google Patents

Filtre hyperfréquence avec des éléments de couplage Download PDF

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Publication number
EP0871235A2
EP0871235A2 EP98400865A EP98400865A EP0871235A2 EP 0871235 A2 EP0871235 A2 EP 0871235A2 EP 98400865 A EP98400865 A EP 98400865A EP 98400865 A EP98400865 A EP 98400865A EP 0871235 A2 EP0871235 A2 EP 0871235A2
Authority
EP
European Patent Office
Prior art keywords
opening
coupling
cavities
probe
microwave 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.)
Withdrawn
Application number
EP98400865A
Other languages
German (de)
English (en)
Other versions
EP0871235A3 (fr
Inventor
José Luis Caceres Armendariz
Khosro Shamsaifar
Silvia Delgado Cabello
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 Lucent SAS
Original Assignee
Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
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 SA, Alcatel Alsthom Compagnie Generale dElectricite filed Critical Alcatel SA
Publication of EP0871235A2 publication Critical patent/EP0871235A2/fr
Publication of EP0871235A3 publication Critical patent/EP0871235A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention refers to a microwave filter and, in particular, to a microwave filter with multiple resonant cavities for use in communication systems, as applied especially, but not exclusively, to satellite communications.
  • Microwave filters with multiple resonant cavities which include specific coupling elements are known, for instance, through the patent application WO 95/27317, "DIELECTRIC RESONATOR FILTER" which, being referred to in the present patent application, is included in it.
  • a monomode microwave filter with multiple resonant cavities which includes two rows of resonant cavities is described, the electromagnetic energy between successive or adjacent cavity resonators being coupled by means of slots -in the walls that separate said cavities, or by means of probes located in said walls; the purpose of said couplings is to obtain a filter-type response of determined characteristics.
  • the probe is usually situated in an opening made in a wall that separates two cavities by means of an insulating material which serves as a mechanical support and at the same time prevents electrical contact between the wall and the probe.
  • an insulating material which serves as a mechanical support and at the same time prevents electrical contact between the wall and the probe.
  • the coupling produced by the slot is mathematically defined as positive, usually the coupling is made through the probe of the opposite sign.
  • the sign and the coupling value that correspond to the probe depend on its length, geometry and relative position with respect to the electromagnetic fields within the resonant cavities.
  • the adjustment of the coupling value produced by a probe is complicated since the effect produced by said probe cannot easily be formulated as a mathematical model. Therefore, the filter adjustment process requires several probes to be tested in order to obtain the desired output characteristics. Consequently, the microwave filter adjustment process requires a long time and this process is expensive.
  • One object of the invention is to provide a microwave filter with multiple resonant cavities which features couplings between adjacent cavities, so that the process for obtaining the output characteristics of said filter is simple, fast and easily repeatable. Consequently, the cost of the process for adjusting the microwave filter is reduced.
  • the microwave filter with multiple resonant cavities of the invention is made up of resonant cavities delimited by conducting walls, said resonant cavities being arranged in such a way that they are ordered consecutively.
  • At least two adjacent cavities are coupled by means of a coupling element comprising at least one first opening in a common wall to said two adjacent cavities, producing a coupling that is mathematically defined as positive; a probe that is placed in said first opening which produces a coupling of opposite sign to that defined by said first opening and, also, includes movable adjustment means which penetrate in the first opening and whose function is to adjust the overall value of the coupling produced by the combination of said first opening and said probe.
  • Figure 1 shows a plan view of the body 11 of a microwave filter with multiple resonant cavities according to the invention, in which the cover of said filter has been removed, so that six consecutively arranged cavities 14,15,16,17,18,19, which are delimited by conducting walls, may be distinguished.
  • the microwave filter with six cavities 14 to 19 will be used, the cavities being arranged for instance, in two rows as an example for describing a preferred embodiment of the invention, without this restricting the use of same to said filter with six resonant cavities.
  • the signal which is filtered by the microwave filter is applied to an input terminal 12 and the filtered signal is available at an output terminal 13 of said filter.
  • the cavities 14 to 19 arranged in two rows, have common conducting walls so that in a conducting wall that is common to the two adjacent and consecutive cavities 14, 15 there is one slot 21 respectively, said slot 21 producing a coupling between the same, and said coupling being mathematically defined as positive.
  • a cross-coupling is one that is produced between two cavities, for example 15 and 18, which are attached but non-consecutive. Accordingly, the combination of positive and negative couplings together with the existence of cross-coupling produces zeros in transmission or equalization zeros, and thus the microwave filter with resonant cavities features a complex transfer function.
  • the cross-coupling between at least two adjacent non-consecutive cavities, for example 15, 18, is produced by means of a coupling element which comprises at least one first opening 22 which produces a coupling that is, for instance, mathematically defined as positive.
  • Said first opening 22 is carried out in a conducting wall 20 that is common to said cavities 15, 18.
  • said first opening 21 is centered in the conducting wall 20; however, in other embodiments it may be moved in relation to the centre of said conducting wall 20.
  • the insulating material 24 serves as a mechanical support and at the same time prevents electrical contact between the conducting wall 20 and said probe 23.
  • the probe 23 produces a coupling of opposite sign to that produced by the first opening 22.
  • movable adjustment means 33 for example a screw, which penetrates said opening 22, so that by moving them the overall value of the coupling is adjusted (see figures 2 and 3).
  • Said movable adjustment means 33 are accessible from outside the microwave filter body 11. Moreover, when moved in order to adjust the output characteristics of the filter, said movable adjustment means 33 can penetrate into the insulation material 24 through a hole 34.
  • the probe 23 is usually made of conductive materials and the coupling value produced by the same is a function of its geometry (symmetrical or asymmetrical) and of its physical dimensions (length).
  • the process for obtaining the output characteristics of the microwave filter will be carried out by moving the adjustable coupling means 33, which is a simple and easily repeatable operation as said means are accessible from outside the filter. Consequently, during the process of adjusting the filter, it will not be necessary to change the probe 23 which is defined theoretically in the design process of said microwave filter.
  • the insulating material 24 which serves as a mechanical support for the probe 23 has a perforation 34 which passes completely through it and in which said probe 23 is housed, protruding on both sides of said insulating material 23 (see figure 3).
  • the movable adjustment means 33 will change not only the overall value of the coupling, but also the sign of the same.
  • the couplings respectively produced by the first opening 22 and the probe 23 must be nearly equal.
  • the cross-coupling may be obtained as a combination of two openings, containing for instance, the first opening 22, the probe 23 with the adjustable coupling means 33 being placed in the second opening, or in the two openings, respectively. Therefore, said two openings will usually be moved in relation to the centre of the conducting wall 20 that is common to the two adjacent cavities 15, 18.
  • the coupling element will be situated, for instance, in the conducting wall that is common to the two adjacent and consecutive cavities 14, 15, producing a negative coupling, said conducting wall not presenting the slot 21.
  • the first opening 22 of the coupling element will usually be moved in relation to the centre of the conducting wall that is common to the two adjacent and consecutive cavities 14, 15.
  • the described coupling element has means for adjusting the overall value and the coupling sign it produces; positive and negative couplings may thus be obtained with said coupling element.

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EP98400865A 1997-04-11 1998-04-09 Filtre hyperfréquence avec des éléments de couplage Withdrawn EP0871235A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9700777 1997-04-11
ES9700777 1997-04-11

Publications (2)

Publication Number Publication Date
EP0871235A2 true EP0871235A2 (fr) 1998-10-14
EP0871235A3 EP0871235A3 (fr) 1999-03-24

Family

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Family Applications (1)

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EP98400865A Withdrawn EP0871235A3 (fr) 1997-04-11 1998-04-09 Filtre hyperfréquence avec des éléments de couplage

Country Status (2)

Country Link
EP (1) EP0871235A3 (fr)
CA (1) CA2231033A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6228870B1 (en) 1998-11-10 2001-05-08 Merck & Co., Inc. Oxazolidinones useful as alpha 1a adrenoceptor antagonists
US6319932B1 (en) 1998-11-10 2001-11-20 Merck & Co., Inc. Oxazolidinones useful as alpha 1A adrenoceptor antagonists
WO2023005651A1 (fr) * 2021-07-29 2023-02-02 中兴通讯股份有限公司 Filtre diélectrique multimode

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075498A1 (fr) * 1981-09-04 1983-03-30 Thomson-Csf Filtre à cavités, présentant un couplage entre cavités non adjacentes
WO1996029754A1 (fr) * 1995-03-23 1996-09-26 Bartley Machine & Manufacturing Company, Inc. Filtre a resonateurs dielectriques
EP0759645A2 (fr) * 1995-08-21 1997-02-26 Murata Manufacturing Co., Ltd. Appareil à résonateur diélectrique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075498A1 (fr) * 1981-09-04 1983-03-30 Thomson-Csf Filtre à cavités, présentant un couplage entre cavités non adjacentes
WO1996029754A1 (fr) * 1995-03-23 1996-09-26 Bartley Machine & Manufacturing Company, Inc. Filtre a resonateurs dielectriques
EP0759645A2 (fr) * 1995-08-21 1997-02-26 Murata Manufacturing Co., Ltd. Appareil à résonateur diélectrique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6228870B1 (en) 1998-11-10 2001-05-08 Merck & Co., Inc. Oxazolidinones useful as alpha 1a adrenoceptor antagonists
US6319932B1 (en) 1998-11-10 2001-11-20 Merck & Co., Inc. Oxazolidinones useful as alpha 1A adrenoceptor antagonists
WO2023005651A1 (fr) * 2021-07-29 2023-02-02 中兴通讯股份有限公司 Filtre diélectrique multimode

Also Published As

Publication number Publication date
EP0871235A3 (fr) 1999-03-24
CA2231033A1 (fr) 1998-10-11

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