EP0339404A1 - Device for tuning the coupling between two waveguides - Google Patents

Device for tuning the coupling between two waveguides Download PDF

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Publication number
EP0339404A1
EP0339404A1 EP89106761A EP89106761A EP0339404A1 EP 0339404 A1 EP0339404 A1 EP 0339404A1 EP 89106761 A EP89106761 A EP 89106761A EP 89106761 A EP89106761 A EP 89106761A EP 0339404 A1 EP0339404 A1 EP 0339404A1
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EP
European Patent Office
Prior art keywords
coupling
tuning
waveguides
waveguide
aperture
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Granted
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EP89106761A
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German (de)
French (fr)
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EP0339404B1 (en
Inventor
Franz-Josef Dipl.-Ing. Görtz
Helmuth Dipl.-Ing. Zeh
Bernhard Dipl.-Ing. Ludwig
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Bosch Telecom GmbH
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ANT Nachrichtentechnik GmbH
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    • 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 in the vicinity of the waveguide wall.
  • Such a device is known from EP 0131 754 A2.
  • 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 coupling aperture has two mutually opposite coupling openings 4 and 4 ', via which a coupling of the electromagnetic fields in the waveguides 1 and 2 arranged on both sides of the coupling aperture 3 he follows.
  • tuning screws 5 and 5 ' are provided. Namely, the tuning screws 5, 5 'penetrate the wall of the waveguide 2 in front of the coupling aperture 3 in the area of the coupling openings 4 and 4', which are located near the waveguide wall in the edge region of the coupling aperture 3.
  • the distance between the tuning screws 5 and 5 'of the coupling aperture 3 should be less than a quarter of the waveguide wavelength.
  • the tuning screws 5 and 5 ' should never be 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' have.
  • the shapes of the coupling openings can be very different, as shown in FIGS. B. round or slit-like.
  • the coupling openings 7, 7 ', 10, 10', 11, 11 'round cross-section shown in Figures 3 and 5, located at the edge of the coupling screen (3) cause a very low-loss coupling.
  • the slot-like coupling openings 6, 6 ', 8, 8', 9, 9 'shown in FIGS. 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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Abstract

The tuning of the coupling between two waveguides which are separated from one another by a coupling aperture is very tedious with known devices, since no defined change in the coupling level can be achieved with them. A defined tuning of the coupling is ensured by arranging at least one tuning screw (5, 5'), penetrating through the waveguide wall, in front of the coupling aperture (3) in the region of the coupling opening (4, 4'). The device according to the invention is suitable, for example, for use in waveguide filters in order to tune these to a desired characteristic with little effort. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Abstimmen der Kopplung zwischen zwei durch eine Koppelblende voneinander getrennten Hohlleitern, wobei die Koppelblende mindestens eine in der Nähe der Hohlleiterwandung gelegene Koppelöffnung aufweist.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 in the vicinity of the waveguide wall.

Eine derartige Vorrichtung ist aus der EP 0131 754 A2 bekannt. Bei dieser Vorrichtung wird die elektromagnetische Kopplung zwischen zwei Hohlraumresonatoren eines Filters mittels Schrauben, die in der Blendenebene angeordnet sind und in die Koppelöffnung eindringen, auf einen gewünschten Wert abgestimmt.Such a device is known from EP 0131 754 A2. In this device, 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.

Die Schrauben in den Koppelöffnungen lassen störende Wellenmoden entstehen, wodurch sich die Charakteristik des Filters verschlechtert. Außerdem verschlechtert sich die Güte des Filters durch das Eindringen der Schrauben in die Koppelöffnungen. Mit den bekannten Mitteln ist keine definierte Abstimmung der Kopplung möglich, was den Abstimmvorgang erschwert und langwierig macht.The screws in the coupling openings create disturbing wave modes, which deteriorates the characteristics of the filter. In addition, the quality of the filter deteriorates due to the penetration of the screws into the coupling openings. With the known means, a defined tuning of the coupling is not possible, which makes the tuning process difficult and lengthy.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art anzugeben, mit der eine möglichst verlustarme und definierte Abstimmung der elektromagnetischen Kopplung zwischen zwei Hohlleitern vorgenommen werden kann.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.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruchs 1 gelöst, und zweckmäßige Ausführungen der Erfindung gehen aus den Unteransprüchen hervor.According to the invention, this object is achieved by the features of patent claim 1, and expedient embodiments of the invention emerge from the subclaims.

Dadurch daß sich in Abhängigkeit von der Eintauchtiefe einer Abstimmschraube vor einer Koppelöffnung einer Koppelblende der Kopplungsgrad sehr definiert verändern läßt, reduziert sich bei Einsatz der erfindungsgemäßen Vorrichtung z. B. in einem Hohlleiterfilter dessen Abgleichaufwand erheblich. Außerdem können hierbei sehr dünne Koppelblenden verwendet werden, wodurch die Masse eines Filters zum Vorteil für die Raumfahrtanwendung gering gehalten werden kann.The fact that, depending on the immersion depth of a tuning screw in front of a coupling opening of a coupling aperture, the degree of coupling can be changed in a very defined manner, reduces when using the device according to the invention, for. B. in a waveguide filter the adjustment effort significantly. In addition, very thin coupling diaphragms can be used, which means that the mass of a filter can be kept low for the benefit of space applications.

Anhand von in der Zeichnung dargestellten Ausführungsbeispielen wird nachfolgend die Erfindung näher erläutert.

  • Figur 1 zeigt einen Längsschnitt zweier durch eine Koppelblende getrennten Hohlleiter,
  • Figur 2 und 3 zeigen Koppelblenden mit einem Paar Koppelöffnungen und
  • Figur 4 und 5 zeigen Koppelblenden mit zwei Paar Koppelöffnungen.
The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawing.
  • FIG. 1 shows a longitudinal section of two waveguides separated by a coupling screen,
  • Figures 2 and 3 show coupling plates with a pair of coupling openings and
  • Figures 4 and 5 show coupling plates with two pairs of coupling openings.

In der Figur 1 sind zwei z. B. zu einem Mikrowellenfilter gehörende Hohlleiter 1 und 2, die durch eine Koppelblende 3 voneinander getrennt sind, dargestellt. Die Koppelblende weist in diesem Ausführungsbeispiel zwei einander gegenüberliegende Koppelöffungen 4 und 4′ auf, über die eine Kopplung der elektromagnetischen Felder in den zu beiden Seiten der Koppelblende 3 angeordneten Hohlleitern 1 und 2 erfolgt. Um die Kopplung verändern, d. h. so abstimmen zu können, daß das Hohlleiterfilter eine gewünschte Charakteristik zeigt, sind Abstimmschrauben 5 und 5′ vorgesehen. Und zwar durchdringen die Abstimmschrauben 5, 5′ die Wandung des Hohlleiters 2 vor der Koppelblende 3 im Bereich der Koppelöffnungen 4 und 4′, die sich nahe der Hohlleiterwandung im Randbereich der Koppelblende 3 befinden. Der Abstand der Abstimmschrauben 5 und 5′ von der Koppelblende 3 sollte kleiner als ein Viertel der Hohlleiterwellenlänge sein. Die Abstimmschrauben 5 und 5′ sollten aber keinesfalls so nah bei den Koppelöffnungen 4 und 4′ angeordnet sein, daß sie gar in sie hineinragen.In Figure 1, two z. B. belonging to a microwave filter waveguide 1 and 2, which are separated by a coupling aperture 3, shown. In this exemplary embodiment, the coupling aperture has two mutually opposite coupling openings 4 and 4 ', via which a coupling of the electromagnetic fields in the waveguides 1 and 2 arranged on both sides of the coupling aperture 3 he follows. In order to change the coupling, ie to be able to tune so that the waveguide filter shows a desired characteristic, tuning screws 5 and 5 'are provided. Namely, the tuning screws 5, 5 'penetrate the wall of the waveguide 2 in front of the coupling aperture 3 in the area of the coupling openings 4 and 4', which are located near the waveguide wall in the edge region of the coupling aperture 3. The distance between the tuning screws 5 and 5 'of the coupling aperture 3 should be less than a quarter of the waveguide wavelength. The tuning screws 5 and 5 'should never be so close to the coupling openings 4 and 4' that they even protrude into them.

Dadurch daß sich die Abstimmschrauben in der beschriebenen Weise in das Hohlleiterinnere hineinragen, bewirken sie bei den Koppelöffnungen eine gewisse Konzentration des Hohlleiterfeldes, wodurch eine starke Kopplung zustande kommt. Diese Kopplung läßt sich sehr gleichmäßig und definiert in Abhängigkeit von der Eindringtiefe der Abstimmschrauben verändern.Characterized in that the 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.

Beim in Figur 1 gezeigten Ausführungsbeispiel sind nur an einer Seite vor der Koppelblende 3 Abstimmschrauben 5, 5′ vorhanden. Es können auch zusätzlich auf der anderen Seite der Koppelblende 3 ein Hohlleiter 1 Abstimmschrauben installiert werden. Die Abstimmschrauben bestehen entweder aus einem leitenden oder einem dielektrischen Material.In the embodiment shown in Figure 1 3 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.

Zweckmäßigerweise sind die Koppelöffnungen in der Koppelblende und dementsprechend die Abstimmschrauben paarweise symmetrisch angeordnet, wodurch die Abstimmbarkeit der elektromagnetischen Kopplung zwischen den durch die Koppelblende getrennten Hohlleitern begünstigt wird. Den Figuren 2 bis 5 sind vier Koppelblenden 3 zu entnehmen, von denen zwei Koppelblenden gemäß Figur 2 und 3 jeweils ein Paar Koppelöffnungen 6, 6′ bzw. 7, 7′ und die anderen Koppelblenden gemäß Figur 4 und 5 zwei Paar Koppelöffnungen 8, 8′ und 9, 9′ bzw. 10, 10′ und 11, 11′ aufweisen. Dabei können die Formen der Koppelöffnungen sehr unterschiedlich sein, wie die Figuren 2-5 zeigen z. B. rund oder schlitzartig.The coupling openings in the coupling screen and, accordingly, the tuning screws are expediently arranged symmetrically in pairs, whereby the tunability of the electromagnetic coupling between the waveguides separated by the coupling screen is favored. 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' have. The shapes of the coupling openings can be very different, as shown in FIGS. B. round or slit-like.

Die in den Figuren 3 und 5 dargestellten, am Rand der Koppelblende (3) befindlichen Koppelöffnungen 7, 7′, 10, 10′, 11, 11′ runden Querschnitts bewirken eine sehr verlustarme Kopplung. Die in den Figuren 2 und 4 gezeigten schlitzartigen, entsprechend der Hohlleiterkontur (hier rund)gebogenen Koppelöffnungen 6, 6′, 8, 8′, 9, 9′ am Rand der Koppelblende 3 haben den Vorteil, daß parasitäre Querkopplungen zwischen - z. B. in Dual-Mode-Filtern auftretenden- Wellenmoden nur sehr gering sind.The coupling openings 7, 7 ', 10, 10', 11, 11 'round cross-section shown in Figures 3 and 5, located at the edge of the coupling screen (3) cause a very low-loss coupling. The slot-like coupling openings 6, 6 ', 8, 8', 9, 9 'shown in FIGS. B. occurring in dual mode filters- wave modes are only very low.

Die dargestellten Koppelblenden 3 haben einen runden Querschnitt und sind daher für den Einsatz bei Rundhohlleitern vorteilhaft. Die beschriebene Vorrichtung ist aber genauso für andere Hohlleiterquerschnittsformen anwendbar.The coupling diaphragms 3 shown have a round cross section and are therefore advantageous for use with round waveguides. However, the described device can also be used for other waveguide cross-sectional shapes.

Claims (8)

1. Vorrichtung zum Abstimmen der Kopplung zwischen zwei durch eine Koppelblende voneinander getrennten Hohlleitern, wobei die Koppelblende mindestens eine in der Nähe der Hohlleiterwandung gelegene Koppelöffnung aufweist, daurch gekennzeichnet, daß vor der Koppelblende (3) im Bereich der Koppelöffnung (4, 4′) mindestens eine die Hohlleiterwandung durchdringende Abstimmschraube (5, 5′) angeordnet ist.1. Device for coordinating the coupling between two waveguides separated from one another by a coupling orifice, the coupling orifice having at least one coupling opening located near the waveguide wall, characterized in that in front of the coupling orifice (3) in the region of the coupling opening (4, 4 ') at least one tuning screw (5, 5 ') penetrating the waveguide wall is arranged. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß in jeden der zwei durch die Koppelblende (3) voneinander getrennten Hohlleitern (1, 2) vor der Koppelblende (3) im Bereich der Koppelöffnung (4, 4′) eine Abstimmschraube 5, 5′) hineinragt.2. Device according to claim 1, characterized in that in each of the two by the coupling plate (3) separated from each other waveguides (1, 2) in front of the coupling plate (3) in the coupling opening (4, 4 '), a tuning screw 5, 5th ′) Protrudes. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Abstand der Abstimmschrauben (5, 5′) von der Koppelblende (3) kleiner als ein Viertel der Hohlleiterwellenlänge ist.3. Apparatus according to claim 1 or 2, characterized in that the distance between the tuning screws (5, 5 ') from the coupling aperture (3) is less than a quarter of the waveguide wavelength. 4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Koppelblende (3) mindestens ein Paar Koppelöffnungen (4, 4′; 6, 6′; 7, 7′; 8, 8′; 9, 9′; 10, 10′; 11, 11′ ) aufweist, die im Randbereich der Koppelblende (3) einander gegenüberliegend angeordnet sind.4. Apparatus according to claim 1 or 2, characterized in that the coupling aperture (3) at least one pair of coupling openings (4, 4 '; 6, 6'; 7, 7 '; 8, 8'; 9, 9 '; 10, 10 '; 11, 11'), which are arranged opposite each other in the edge region of the coupling panel (3). 5. Vorrichtung nach Anspruch 1 oder 4, dadurch gekennzeichnet, daß der Querschnitt der Koppelöffnung(en) (7, 7′; 10, 10′; 11, 11′) kreisförmig ist.5. Apparatus according to claim 1 or 4, characterized in that the cross section of the coupling opening (s) (7, 7 '; 10, 10'; 11, 11 ') is circular. 6. Vorrichtung nach Anspruch 1 oder 4, dadurch gekennzeichnet, daß die Koppelöffnung(en) (6, 6′; 8, 8′; 9, 9′) die Form eines sich entlang der Hohlleiterwandung erstreckenden Schlitzes hat (haben).6. The device according to claim 1 or 4, characterized in that the coupling opening (s) (6, 6 '; 8, 8'; 9, 9 ') has the shape of a slot extending along the waveguide wall (have). 7. Vorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Abstimmschrauben (5, 5′) aus einem leitenden Material bestehen.7. The device according to claim 1, 2 or 3, characterized in that the tuning screws (5, 5 ') consist of a conductive material. 8. Vorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Abstimmschrauben (5, 5′) aus einem dielektrischen Material bestehen.8. The device according to claim 1, 2 or 3, characterized in that the tuning screws (5, 5 ') consist of a dielectric material.
EP89106761A 1988-04-23 1989-04-15 Device for tuning the coupling between two waveguides Expired - Lifetime EP0339404B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3813812A DE3813812A1 (en) 1988-04-23 1988-04-23 DEVICE FOR TUNING THE COUPLING BETWEEN TWO WAVE LADDERS
DE3813812 1988-04-23

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EP0339404A1 true EP0339404A1 (en) 1989-11-02
EP0339404B1 EP0339404B1 (en) 1993-06-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675952A1 (en) * 1991-04-29 1992-10-30 Alcatel Telspace UHF filter with one or more resonant cavities

Citations (5)

* 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
US3748604A (en) * 1971-04-21 1973-07-24 Bell Telephone Labor Inc Tunable microwave bandstop resonant cavity apparatus
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
EP0131754A2 (en) * 1983-06-15 1985-01-23 TELETTRA Telefonia Elettronica e Radio S.p.A. Dual mode filters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969969C (en) * 1955-01-14 1958-08-14 Siemens Ag Coupling device for microwaves
DE2247803C3 (en) * 1972-09-29 1979-01-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Coupling arrangement

Patent Citations (5)

* 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
US3748604A (en) * 1971-04-21 1973-07-24 Bell Telephone Labor Inc Tunable microwave bandstop resonant cavity apparatus
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
EP0131754A2 (en) * 1983-06-15 1985-01-23 TELETTRA Telefonia Elettronica e Radio S.p.A. Dual mode filters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 121 (E-143), 144 E 143; & JP-A-54 99 547 (MITSUBISHI DENKI K.K.) 06-08-1979 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675952A1 (en) * 1991-04-29 1992-10-30 Alcatel Telspace UHF filter with one or more resonant cavities

Also Published As

Publication number Publication date
DE58904688D1 (en) 1993-07-22
DE3813812A1 (en) 1989-11-02
EP0339404B1 (en) 1993-06-16
DE3813812C2 (en) 1991-06-06

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