EP0395888A2 - Coupling iris - Google Patents

Coupling iris Download PDF

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Publication number
EP0395888A2
EP0395888A2 EP90106107A EP90106107A EP0395888A2 EP 0395888 A2 EP0395888 A2 EP 0395888A2 EP 90106107 A EP90106107 A EP 90106107A EP 90106107 A EP90106107 A EP 90106107A EP 0395888 A2 EP0395888 A2 EP 0395888A2
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EP
European Patent Office
Prior art keywords
coupling
openings
wave mode
wave
coupling openings
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Granted
Application number
EP90106107A
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German (de)
French (fr)
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EP0395888A3 (en
EP0395888B1 (en
Inventor
Uwe Dipl.-Ing. Rosenberg
Dieter Dipl.-Ing. Wolk
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Bosch Telecom GmbH
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ANT Nachrichtentechnik GmbH
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Publication of EP0395888A2 publication Critical patent/EP0395888A2/en
Publication of EP0395888A3 publication Critical patent/EP0395888A3/en
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Publication of EP0395888B1 publication Critical patent/EP0395888B1/en
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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
    • H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion

Definitions

  • the present invention relates to a coupling diaphragm which is arranged between two cavity resonators of a microwave filter and has at least two coupling openings which are dimensioned and placed in such a way that coupling between the same wave types occurs in the two cavity resonators.
  • Such a coupling aperture is from IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-35, No. 12, Dec. 1987, pp. 1143-1149.
  • the coupling openings are arranged in the coupling aperture in such a way that, if possible, only one single wave mode is coupled in the two cavity resonators separated from one another by the coupling aperture.
  • the coupling openings are placed according to the prior art in such a way that the wave mode not to be coupled has the lowest possible field strength there.
  • the invention is based on the object of specifying a coupling panel of the type mentioned in the the coupling openings are arranged so that the desired coupling is very strong, but each parasitic coupling is reduced as much as possible.
  • the implementation of the coupling aperture carried out according to the invention brings about a very strong coupling of a first wave mode existing in both adjacent cavity resonators and at the same time still a second wave mode also existing in both cavity resonators via a plurality of coupling openings.
  • parasitic coupling between non-similar wave modes is largely reduced.
  • coupling orifices which can be used between the two adjacent cavity resonators is shown in FIG
  • coupling orifices have two coupling openings K1 and K2 of identical dimensions.
  • the locations for the coupling openings K1 and K2 are selected such that the magnetic field or a magnetic field component of the TE 11n wave mode existing in both adjacent cavity resonators at the coupling opening K1 is oriented in the same direction as with the coupling opening K2.
  • the magnetic field, or a magnetic field component, of the TM 01m wave mode existing in both cavity resonators is also oriented at least almost parallel to the field of the TE 11n wave mode.
  • the magnetic field or a magnetic field component of the TM 01m wave mode is aligned antiparallel to the magnetic field component of the TE 11n wave mode located there.
  • the magnetic field component of the TM 01m wave mode is oriented in opposite directions, but it has the same field strength there.
  • the coupling openings K1 and K2 have a greater extent in the direction of the magnetic fields or field tangents than transversely to them.
  • the coupling openings can also have a different shape, deviating from the slot shape shown in FIG. 2.
  • the wave modes are coupled via the magnetic field.
  • coupling via the electric field can be realized.

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Abstract

1. Coupling aperture 2.1 It is intended to specify a coupling aperture in which the coupling openings are arranged such that desired couplings are effected while very heavily parasitic couplings are reduced as much as possible. 2.2 This object is achieved in that coupling openings (K1, K2) are arranged in the coupling aperture (KB) such that couplings take place via said openings for two mutually independent wave modes and such that coupling of the two wave modes takes place via at least one of the coupling openings and a coupling of equal magnitude, but in the opposite sense, likewise takes place via at least one of the other coupling openings, so that these two couplings in opposite senses cancel one another out. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Koppelblende, die zwischen zwei Hohlraumresonatoren eines Mikrowellenfilters angeordnet ist und mindestens zwei Koppelöffnungen aufweist, welche so dimensioniert und plaziert sind, daß eine Kopplung zwischen gleichen Wellentypen in den beiden Hohlraumresonatoren eintritt.The present invention relates to a coupling diaphragm which is arranged between two cavity resonators of a microwave filter and has at least two coupling openings which are dimensioned and placed in such a way that coupling between the same wave types occurs in the two cavity resonators.

Eine solche Koppelblende ist aus IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-35, No. 12, Dec. 1987, S. 1143 - 1149 bekannt. Dabei sind die Koppelöffnungen in der Koppelblende so angeordnet, daß damit die Kopplung möglichst nur eines einzigen Wellenmodes in den beiden durch die Koppelblende voneinander getrennten Hohlraumresonatoren erfolgt. Um zu vermeiden, daß über die Koppelöffnungen ein Wellenmode in einem der beiden Hohlraumresonatoren mit einem andersartigen Wellenmode in dem benachbarten Hohlraumresonator koppelt, werden gemäß dem Stand der Technik die Koppelöffnungen so plaziert, daß dort der nicht zu koppelnde Wellenmode eine möglichst geringe Feldstärke aufweist. Ideal wären Orte für die Koppelöffnungen, wo der zu koppelnde Wellenmode ein Feldstärkemaximum und der nicht zu koppelnde Wellenmode ein Feldstärkeminimierung besäße. Solche Orte existieren in der Regel nicht, so daß es neben der gewünschten Kopplung immer auch eine parasitäre Kopplung geben wird.Such a coupling aperture is from IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-35, No. 12, Dec. 1987, pp. 1143-1149. The coupling openings are arranged in the coupling aperture in such a way that, if possible, only one single wave mode is coupled in the two cavity resonators separated from one another by the coupling aperture. In order to prevent a wave mode in one of the two cavity resonators from coupling with a different wave mode in the adjacent cavity resonator via the coupling openings, the coupling openings are placed according to the prior art in such a way that the wave mode not to be coupled has the lowest possible field strength there. Ideal locations would be for the coupling openings, where the wave mode to be coupled would have a field strength maximum and the wave mode not to be coupled would have a field strength minimization. Such places generally do not exist, so that there will always be a parasitic coupling in addition to the desired coupling.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Koppelblende der eingangs genannten Art anzugeben, in der die Koppelöffnungen so angeordnet sind, daß die jeweils gewollte Kopplung sehr stark ist, jede parasitäre Kopplung aber möglichst weitgehend reduziert wird.The invention is based on the object of specifying a coupling panel of the type mentioned in the the coupling openings are arranged so that the desired coupling is very strong, but each parasitic coupling is reduced as much as possible.

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

Die nach der Erfindung vorgenommene Realisierung der Koppelblende bewirkt über mehrere Koppelöffnungen eine sehr starke Kopplung eines ersten in beiden benachbarten Hohlraumresonatoren existenten Wellenmodes und gleichzeitig noch eines zweiten, ebenfalls in beiden Hohlraumresonatoren existenten Wellenmodes. Dabei wird aber eine parasitäre Kopplung zwischen nicht gleichartigen Wellenmoden weitgehend reduziert.The implementation of the coupling aperture carried out according to the invention brings about a very strong coupling of a first wave mode existing in both adjacent cavity resonators and at the same time still a second wave mode also existing in both cavity resonators via a plurality of coupling openings. However, parasitic coupling between non-similar wave modes is largely reduced.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels wird nachfolgend die Erfindung näher erläutert.

  • Fig. 1 zeigt Feldbilder eines TM01M und eines TE11n Wellenmodes und
  • Fig. 2 zeigt eine Koppelblende mit zwei Koppelöffnungen.
Based on an embodiment shown in the drawing, the invention is explained in more detail below.
  • 1 shows field images of a TM 01M and a TE 11n wave mode and
  • Fig. 2 shows a coupling aperture with two coupling openings.

In dem hier beschriebenen Ausführungsbeispiel wird von zwei zu einem Mikrowellenfilter gehörenden Hohlraumresonatoren (mit rundem Querschnitt) ausgegangen, in denen jeweils ein TM01m (m = 0,1,2,...) Wellenmode und ein TE11n (n = 1,2,3,...) Wellenmode existent sind. Die Feldbilder dieser beiden Wellenmoden sind der Fig. 1 zu entnehmen.In the exemplary embodiment described here, two cavity resonators (with a round cross section) belonging to a microwave filter are assumed, in each of which a TM 01m (m = 0.1.2, ...) wave mode and a TE 11n (n = 1.2 , 3, ...) wave fashion exist. The field images of these two wave modes can be seen in FIG. 1.

Eine zwischen den beiden benachbarten Hohlraumresonatoren einsetzbare Koppelblende KB zeigt die Fig. 2. In der Koppelblende sind bei der dargestellten Ausführung zwei gleichdimensionierte Koppelöffnungen K1 und K2 vorhanden. Die Orte für die Koppelöffnungen K1 und K2 sind so gewählt, daß das magnetische Feld bzw. eine magnetische Feldkomponente des in beiden benachbarten Hohlraumresonatoren existenten TE11n Wellenmodes bei der Koppelöffnung K1 in die gleiche Richtung orientiert ist wie bei der Koppelöffnung K2. Am Ort der Koppelöffnung K1 ist zudem das magnetische Feld, bzw. eine magnetische Feldkomponente, des in beiden Hohlraumresonatoren existenten TM01m Wellenmodes zumindest nahezu parallel zum Feld des TE11n Wellenmodes orientiert. Und am Ort der anderen Koppelöffnung K2 ist das magnetische Feld bzw. eine magnetische Feldkomponente des TM01m Wellenmodes antiparallel zu der dort befindlichen magnetischen Feldkomponente des TE11n Wellenmodes ausgerichtet. An den Orten der beiden Koppelöffnungen K1 und K2 ist also die magnetische Feldkomponente des TM01m Wellenmodes in entgegegesetzte Richtungen orientiert, sie hat aber dort die gleiche Feldstärke.A coupling orifice KB which can be used between the two adjacent cavity resonators is shown in FIG In the embodiment shown, coupling orifices have two coupling openings K1 and K2 of identical dimensions. The locations for the coupling openings K1 and K2 are selected such that the magnetic field or a magnetic field component of the TE 11n wave mode existing in both adjacent cavity resonators at the coupling opening K1 is oriented in the same direction as with the coupling opening K2. At the location of the coupling opening K1, the magnetic field, or a magnetic field component, of the TM 01m wave mode existing in both cavity resonators is also oriented at least almost parallel to the field of the TE 11n wave mode. And at the location of the other coupling opening K2, the magnetic field or a magnetic field component of the TM 01m wave mode is aligned antiparallel to the magnetic field component of the TE 11n wave mode located there. At the locations of the two coupling openings K1 and K2, the magnetic field component of the TM 01m wave mode is oriented in opposite directions, but it has the same field strength there.

Unter diesen Voraussetzungen finden über die Koppelöffnungen K1, K2 eine Kopplung zwischen den TE11n Wellenmoden und eine Kopplung zwischen den TM01m Wellenmoden der beiden Hohlraumresonatoren statt. Allerdings koppelt ebenso der TM01m Wellenmode eines Hohlraumresonators mit dem TE11n Wellenmode des benachbarten Hohlraumresonators. Hierbei handelt es sich um eine unerwünschte parasitäre Kopplung. Da aber über die beiden Koppelöffnungen K1 und K2 zwei betragsmäßig gleich große antiparallel gerichtete Feldkomponenten des TM01m Wellenmodes mit dem TE11n Wellenmode koppeln, kompensiert eine Kopplung die andere, so daß die parasitäre Kopplung sich insgesamt auslöscht.Under these conditions there is a coupling between the TE 11n wave modes and a coupling between the TM 01m wave modes of the two cavity resonators via the coupling openings K1, K2. However, the TM 01m wave mode of one cavity resonates with the TE 11n wave mode of the neighboring cavity. This is an undesirable parasitic coupling. However, since two coupling components K1 and K2 with the same magnitude are coupled via the two coupling openings K1 and K2 of the TM 01m wave mode to the TE 11n wave mode, one coupling compensates the other, so that the parasitic coupling is canceled out overall.

Damit es zu Kopplungen zwischen den genannten Wellenmoden kommt, haben die Koppelöffnungen K1 und K2 in Richtung der magnetischen Felder bzw. Feldtangenten eine größere Ausdehnung als quer dazu. Die Koppelöffnungen können auch abweichend von der in Fig. 2 dargestellten Schlitzform eine andere Formgebung haben. Gemäß dem beschriebenen Ausführungsbeispiel erfolgt die Kopplung der Wellenmoden über das magnetische Feld. Genauso läßt sich bei entsprechender Lage und Form der Koppelöffnungen eine Kopplung über das elektrische Feld realisieren.So that there are couplings between the wave modes mentioned, the coupling openings K1 and K2 have a greater extent in the direction of the magnetic fields or field tangents than transversely to them. The coupling openings can also have a different shape, deviating from the slot shape shown in FIG. 2. According to the exemplary embodiment described, the wave modes are coupled via the magnetic field. In the same way, with the appropriate position and shape of the coupling openings, coupling via the electric field can be realized.

Anstatt, wie beschrieben, nur zwei Koppelöffnungen in der Koppelblende vorzusehen, kann sie auch mit mehr als zwei Koppelöffnungen versehen werden. Prinzipiell ist bei der Anordnung der Koppelöffnungen darauf zu achten, daß sie so plaziert sind, daß darüber für zwei voneinander unabhängige Wellenmoden Kopplungen stattfinden und daß über mindestens eine der Koppelöffnungen eine Verkopplung der beiden Wellenmoden und über mindestens eine der anderen Koppelöffnungen ebenfalls eine gleich große, aber entgegengesetzte Verkopplung erfolgt, so daß sich diese beiden entgegengesetzten Verkopplungen in der Summe gegenseitig aufheben.Instead of providing only two coupling openings in the coupling screen, as described, it can also be provided with more than two coupling openings. In principle, when arranging the coupling openings, care must be taken that they are placed in such a way that couplings take place above them for two mutually independent wave modes and that at least one of the coupling openings couples the two wave modes and at least one of the other coupling openings also has the same size, but opposite coupling takes place, so that these two opposite couplings cancel each other out in total.

Claims (4)

1. Koppelblende, die zwischen zwei Hohlraumresonatoren eines Mikrowellenfilters angeordnet ist und mindestens zwei Koppelöffnungen aufweist, welche so dimensioniert und plaziert sind, daß eine Kopplung zwischen gleichen Wellentypen in den beiden Hohlraumresonatoren eintritt,
dadurch gekennzeichnet,
daß die Koppelöffnungen (K1, K2) so angeordnet sind, daß darüber für zwei voneinander unabhängige Wellenmoden Kopplungen stattfinden und daß über mindestens eine der Koppelöffnungen eine Verkopplung der beiden Wellenmoden und über mindestens eine der anderen Koppelöffnungen ebenfalls eine gleich große, aber entgegengesetzte Verkopplung erfolgt, so daß sich diese beiden entgegengesetzten Verkopplungen in der Summe gegenseitig aufheben.1. coupling aperture, which is arranged between two cavity resonators of a microwave filter and has at least two coupling openings, which are dimensioned and placed so that a coupling between the same wave types occurs in the two cavity resonators,
characterized,
that the coupling openings (K1, K2) are arranged in such a way that couplings take place for two mutually independent wave modes and that at least one of the coupling openings is coupled to the two wave modes and at least one of the other coupling openings is also of equal size but opposite coupling, so that these two opposite couplings cancel each other out in total. 2. Koppelblende nach Anspruch 1, dadurch gekennzeichnet, daß zwei Koppelöffnungen (K1, K2) so angeordnet sind, daß eine elektrische oder magnetische Feldkomponente eines ersten Wellenmodes am Ort einer der beiden Koppelöffnungen (K1, K2) in die gleiche Richtung orientiert ist wie am Ort der anderen Koppelöffnung und
daß außerdem eine elektrische oder magnetische Feldkomponente eines zweiten Wellenmodes am Ort eines der beiden Koppelöffnungen die zumindest nahezu gleiche Feldstärke aufweist wie am Ort der anderen Koppelöffnung, aber diese Feldkoponente an den Orten der Koppelöffnungen (K1, K2) in entgegengesetze Richtung orientiert ist.2. Coupling aperture according to claim 1, characterized in that two coupling openings (K1, K2) are arranged so that an electrical or magnetic field component of a first wave mode at the location of one of the two coupling openings (K1, K2) is oriented in the same direction as on Location of the other coupling opening and
that in addition an electrical or magnetic field component of a second wave mode at the location of one of the two coupling openings has at least almost the same field strength as at the location of the other coupling opening, but this field component at the locations of the coupling openings (K1, K2) is oriented in the opposite direction. 3. Koppelblende nach Anspruch 2, dadurch gekennzeichnet, daß in beiden durch die Koppelblende (KB) voneinander getrennten Hohlraumresonatoren ein TE11n(n = 1,2,...) Wellenmode und ein TM01m (m= 0,1,2,...) Wellenmode existent sind und
daß die Koppelöffnungen (K1, K2) in der Koppelblende (KB) sich an Orten befinden, wo eine magnetische Feldkomponente des TE11n Wellenmodes in die gleiche Richtung orientiert ist, und wo eine magnetische Feldkomponente des TM01m Wellenmodes von gleicher Feldstärke aber in entgegengesetzte Richtung orientiert ist.3. Coupling diaphragm according to claim 2, characterized in that a TE 11n (n = 1,2, ...) in both cavity resonators separated from one another by the coupling diaphragm (KB). Wave mode and a TM 01m (m = 0,1,2, ...) wave mode exist and
that the coupling openings (K1, K2) in the coupling aperture (KB) are located at locations where a magnetic field component of the TE 11n wave mode is oriented in the same direction and where a magnetic field component of the TM 01m wave mode of the same field strength but in the opposite direction is oriented. 4. Koppelblende nach Anspruch 2 oder 3, dadurch gekennzeichnet,
daß am Ort einer der zwei Koppelöffnungen (K1, K2) die Feldkomponeneten der beiden Wellenmoden parallel und am Ort der anderen Koppelöffnung antiparallel zueinander orientiert sind und
daß die Koppelöffnungen (K1, K2) in Orientierungsrichtung der Feldkomponenten der beiden Wellenmoden eine größere Ausdehnung haben als quer dazu.4. coupling panel according to claim 2 or 3, characterized in
that the field components of the two wave modes are oriented parallel to one another at the location of one of the two coupling openings (K1, K2) and antiparallel to one another at the location of the other coupling opening and
that the coupling openings (K1, K2) have a greater extent in the orientation direction of the field components of the two wave modes than transversely thereto.
EP90106107A 1989-04-29 1990-03-30 Coupling iris Expired - Lifetime EP0395888B1 (en)

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DE3914246 1989-04-29
DE3914246 1989-04-29

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EP0395888A2 true EP0395888A2 (en) 1990-11-07
EP0395888A3 EP0395888A3 (en) 1991-09-25
EP0395888B1 EP0395888B1 (en) 1995-03-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1187248A2 (en) * 2000-08-29 2002-03-13 Com Dev Ltd. A side-coupled microwave filter with circumferentially-spaced irises

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230481A (en) * 1959-09-30 1966-01-18 David J Lewis Method for segregating harmonic power in a waveguide system
US3715688A (en) * 1970-09-04 1973-02-06 Rca Corp Tm01 mode exciter and a multimode exciter using same
JPS5499547A (en) * 1978-01-24 1979-08-06 Mitsubishi Electric Corp Resonant cavity type band pass filter
US4742317A (en) * 1986-05-23 1988-05-03 General Electric Company Mode coupler for monopulse antennas and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230481A (en) * 1959-09-30 1966-01-18 David J Lewis Method for segregating harmonic power in a waveguide system
US3715688A (en) * 1970-09-04 1973-02-06 Rca Corp Tm01 mode exciter and a multimode exciter using same
JPS5499547A (en) * 1978-01-24 1979-08-06 Mitsubishi Electric Corp Resonant cavity type band pass filter
US4742317A (en) * 1986-05-23 1988-05-03 General Electric Company Mode coupler for monopulse antennas and the like

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Band 32, Nr. 11, November 1984, Seiten 1449-1454, New York, US; W.-C. TANG et al.: "A true elliptic-function filter using triple-mode degenerate cavities" *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Band 35, Nr. 12, Dezember 1987, Seiten 1143-1149, New York, US; R. BONETTI et al.: "Application of dual TM modes to triple- and quadruple-mode filters" *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Band 37, Nr. 12, Dezember 1989, Seiten 2011-2019, New York, US; U. ROSENBERG et al.: "Filter design using in-line triple-mode cavities and novel iris couplings" *
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 121 (E-143), 11. Oktober 1979; & JP-A-54 99 547 (MITSUBISHI DENKI K.K.) 06-08-1979 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1187248A2 (en) * 2000-08-29 2002-03-13 Com Dev Ltd. A side-coupled microwave filter with circumferentially-spaced irises
EP1187248A3 (en) * 2000-08-29 2003-07-02 Com Dev Ltd. A side-coupled microwave filter with circumferentially-spaced irises

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Publication number Publication date
DE59008563D1 (en) 1995-04-06
EP0395888A3 (en) 1991-09-25
EP0395888B1 (en) 1995-03-01

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