EP0339404B1 - Vorrichtung zum Abstimmen der Kopplung zwischen zwei Hohlleitern - Google Patents

Vorrichtung zum Abstimmen der Kopplung zwischen zwei Hohlleitern Download PDF

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Publication number
EP0339404B1
EP0339404B1 EP89106761A EP89106761A EP0339404B1 EP 0339404 B1 EP0339404 B1 EP 0339404B1 EP 89106761 A EP89106761 A EP 89106761A EP 89106761 A EP89106761 A EP 89106761A EP 0339404 B1 EP0339404 B1 EP 0339404B1
Authority
EP
European Patent Office
Prior art keywords
coupling
tuning
diaphragm
openings
waveguides
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
EP89106761A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0339404A1 (de
Inventor
Franz-Josef Dipl.-Ing. Görtz
Helmuth Dipl.-Ing. Zeh
Bernhard Dipl.-Ing. Ludwig
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.)
Bosch Telecom GmbH
Original Assignee
ANT Nachrichtentechnik GmbH
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 ANT Nachrichtentechnik GmbH filed Critical ANT Nachrichtentechnik GmbH
Publication of EP0339404A1 publication Critical patent/EP0339404A1/de
Application granted granted Critical
Publication of EP0339404B1 publication Critical patent/EP0339404B1/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

Definitions

  • the present invention relates to a device for tuning the coupling between two waveguides separated from one another by a coupling diaphragm, the coupling diaphragm having at least one coupling opening located near the waveguide wall and for tuning the coupling taking place via the coupling opening, at least one penetrating the waveguide wall in the region of the coupling opening Tuning screw is provided.
  • Such a device is e.g. known from EP-A-0131 754, US-A-4,028,651 or US-A-4,251,787.
  • the electromagnetic coupling between two cavity resonators of a filter is adjusted to a desired value by means of screws which are arranged in the diaphragm plane and penetrate into the coupling opening.
  • the screws in the coupling openings create disturbing wave modes, which deteriorates the characteristics of the filter.
  • the quality of the filter deteriorates due to the penetration of the screws into the coupling openings.
  • a defined tuning of the coupling is not possible, which makes the tuning process difficult and lengthy.
  • the invention is therefore based on the object of specifying a device of the type mentioned at the outset with which the electromagnetic coupling between two waveguides can be tuned with as little loss as possible and defined.
  • the degree of coupling can be changed in a very defined manner as a function of the immersion depth of a tuning screw in front of a coupling opening of a coupling aperture reduces, for example, when using the device according to the invention. in a waveguide filter, the adjustment effort considerably.
  • very thin coupling diaphragms can be used here, whereby the mass of a filter can be small to the advantage for space applications.
  • US-A-2,649,576 discloses a waveguide branch in which waveguides which are perpendicular to one another are coupled to one another via coupling plates.
  • screws are provided which, if the waveguide construction permits, are arranged directly in the diaphragm plane. In the event that this arrangement of the tuning screws is not possible due to the position of the waveguide, the screws are offset from the diaphragm plane. This offset of the tuning screws with respect to the aperture level is not carried out in the prior art in order to achieve the above-mentioned object or to achieve advantages.
  • the coupling aperture has two mutually opposite coupling openings 4 and 4 ′, via which the electromagnetic fields are coupled in the waveguides 1 and 2 arranged on both sides of the coupling aperture 3 he follows.
  • tuning screws 5 and 5 ' are provided in order to change the coupling, ie to be able to tune it so that the waveguide filter shows a desired characteristic. Namely, the tuning screws 5, 5 'penetrate the wall of the waveguide 2 in front of the coupling screen 3 in the area of the coupling openings 4 and 4', which are located near the waveguide wall in the edge area of the coupling screen 3.
  • the distance between the tuning screws 5 and 5 'from the coupling aperture 3 should be less than a quarter of the waveguide wavelength.
  • the tuning screws 5 and 5 ' should under no circumstances be arranged so close to the coupling openings 4 and 4' that they even protrude into them.
  • tuning screws protrude into the interior of the waveguide in the manner described, they bring about a certain concentration of the waveguide field at the coupling openings, as a result of which strong coupling occurs. This coupling can be changed very evenly and in a defined manner depending on the depth of penetration of the tuning screws.
  • tuning screws 5, 5 ' are only on one side in front of the coupling panel.
  • a waveguide 1 tuning screws can also be installed on the other side of the coupling panel 3.
  • the tuning screws are made of either a conductive or a dielectric material.
  • FIGS. 2 to 5 show four coupling plates 3, of which two coupling plates according to FIGS. 2 and 3 each have a pair of coupling openings 6, 6 'and 7, 7' and the other coupling plates according to FIGS. 4 and 5 show two pairs of coupling openings 8, 8 'and 9, 9' and 10, 10 'and 11, 11'.
  • the shapes of the coupling openings can be very different, as shown in FIGS. B. round or slit-like.
  • the slot-like coupling openings 6, 6 ', 8, 8', 9, 9 'shown in FIGS. 2 and 4 at the edge of the coupling aperture 3 have the advantage that parasitic cross-couplings between - e.g. B. occurring in dual mode filters- wave modes are only very low.
  • the coupling diaphragms 3 shown have a round cross section and are therefore advantageous for use with round waveguides.
  • the described device can also be used for other waveguide cross-sectional shapes.

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EP89106761A 1988-04-23 1989-04-15 Vorrichtung zum Abstimmen der Kopplung zwischen zwei Hohlleitern Expired - Lifetime EP0339404B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3813812A DE3813812A1 (de) 1988-04-23 1988-04-23 Vorrichtung zum abstimmen der kopplung zwischen zwei hohlleitern
DE3813812 1988-04-23

Publications (2)

Publication Number Publication Date
EP0339404A1 EP0339404A1 (de) 1989-11-02
EP0339404B1 true EP0339404B1 (de) 1993-06-16

Family

ID=6352773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89106761A Expired - Lifetime EP0339404B1 (de) 1988-04-23 1989-04-15 Vorrichtung zum Abstimmen der Kopplung zwischen zwei Hohlleitern

Country Status (2)

Country Link
EP (1) EP0339404B1 (enrdf_load_stackoverflow)
DE (2) DE3813812A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675952B1 (fr) * 1991-04-29 1993-10-22 Alcatel Telspace Filtre hyperfrequence a une ou plusieurs cavites resonnantes.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649576A (en) * 1949-10-07 1953-08-18 Bell Telephone Labor Inc Pseudohybrid microwave device
DE969969C (de) * 1955-01-14 1958-08-14 Siemens Ag Kopplungsvorrichtung fuer Mikrowellen
US3748604A (en) * 1971-04-21 1973-07-24 Bell Telephone Labor Inc Tunable microwave bandstop resonant cavity apparatus
DE2247803C3 (de) * 1972-09-29 1979-01-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Koppelanordnung
US4028651A (en) * 1976-05-06 1977-06-07 Hughes Aircraft Company Coupled-cavity microwave filter
US4251787A (en) * 1979-03-19 1981-02-17 Hughes Aircraft Company Adjustable coupling cavity filter
IT1163520B (it) * 1983-06-15 1987-04-08 Telettra Lab Telefon Filtri dual-mode

Also Published As

Publication number Publication date
DE3813812C2 (enrdf_load_stackoverflow) 1991-06-06
EP0339404A1 (de) 1989-11-02
DE3813812A1 (de) 1989-11-02
DE58904688D1 (de) 1993-07-22

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