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EP0218807A2 - Attenuation and delay equalizer for a waveguide filter - Google Patents

Attenuation and delay equalizer for a waveguide filter Download PDF

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Publication number
EP0218807A2
EP0218807A2 EP86109680A EP86109680A EP0218807A2 EP 0218807 A2 EP0218807 A2 EP 0218807A2 EP 86109680 A EP86109680 A EP 86109680A EP 86109680 A EP86109680 A EP 86109680A EP 0218807 A2 EP0218807 A2 EP 0218807A2
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Prior art keywords
waveguide
coupling
section
coupling opening
filter
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Granted
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EP86109680A
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German (de)
French (fr)
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EP0218807B1 (en
EP0218807A3 (en
Inventor
Franz-Josef Dipl.-Ing. Görtz
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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
    • H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide

Definitions

  • the present invention relates to an arrangement for equalizing the attenuation and the transit time of a microwave filter embodied in waveguide technology, wherein an at least two-circuit cavity resonator is coupled to the filter waveguide via a coupling opening, the individual waveguide sections of which are also coupled to one another via coupling openings, and the coupling openings are dimensioned in such a way that that the cavity resonator is critically coupled with respect to the runtime behavior.
  • the invention is based on the object of specifying an equalizer arrangement of the type mentioned at the beginning, the damping and transit time of which can be set independently of one another.
  • FIG. 1 shows a section through the broad sides of a rectangular waveguide 1 belonging to a microwave filter, to the one broad side 2 of which a double-circuit cavity resonator 3 serving as an equalizer is coupled.
  • This dual-circuit cavity resonator 3 has the task of influencing the transit time and amplitude of the field passing through the filter waveguide 1. Specifically, the runtime behavior ⁇ shown in FIG. 2 and the damping behavior ⁇ shown in FIG. 3 of the filter, whose curves ⁇ are only flat in an extremely narrow frequency range without equalizer, are to be changed by the equalizer so that they have a wider frequency range show behavior that is as independent of frequency as possible (see curves b). This goal is achieved with an equalizer whose runtime curve (see curve c in FIG. 2) and its damping curve (see curve c in FIG. 3) have no drops in the region around the center frequency f o of the equalizer. Such an ideal transit time behavior of the equalizer occurs when the cavity resonator 3 is critically coupled with respect to the transit time.
  • the equalizer consists of two circular waveguide sections 5 and 6, which are arranged one behind the other in the axial direction and separated from one another by an intermediate wall 4.
  • the first of the two circular waveguide sections 5 is connected to the via a coupling opening 7 inserted into the broad waveguide side 2 Filter waveguide 1 coupled.
  • the coupling opening 7 is located at a point on the filter waveguide 1 where two components aligned perpendicular to one another of the magnetic field (H x , H y ) are equal, so that a circularly polarized field is coupled into the first circular waveguide section 5.
  • Both circular waveguide sections 5 and 6 are coupled to one another via a second coupling opening 8 provided in the intermediate wall 4.
  • Both coupling openings 7, 8 can, for example, be rectangular, round or designed as cross slots, they only have to be dimensioned such that the entire cavity 3, as already mentioned, is critically coupled with respect to the propagation time behavior.
  • the coupling opening 7 in the wall 2 of the filter waveguide 1 is larger than the coupling opening 8 in the intermediate wall 4, because the coupling degree between the filter waveguide 1 and the first circular waveguide section 5 should be greater than the coupling degree between the first and the second circular waveguide section.
  • the coupling degree of the larger coupling opening 7 is e.g. in the range of 0.2 - 0.3 and the coupling degree of the smaller coupling opening 8 e.g. in the range of 0.014 - 0.025.
  • the attenuation curve of the cavity resonator 3 like its transit time curve, has no dips in the vicinity of the resonance frequency f o is that the qualities of the two resonator circuits are almost the same size.
  • the resonator circuit formed by the first circular waveguide section 5 is of a lower quality than the resonator circuit formed by the second circular waveguide section 6.
  • the first resonator circuit has larger openings in the walls delimiting it, namely the large coupling opening 7 and the small coupling opening 8, than the second resonator circuit, which is broken through in its wall only by the small coupling opening 8.
  • the short-circuit wall 9 of the second circular waveguide is down Section 6 uses a tuning screw 10, which consists of a power-absorbing material, for example epoxy filled with magnetic powder.
  • This power-absorbing tuning screw 10 only affects the damping ⁇ and thus the quality (Q ⁇ ) of the second resonator circuit, but not its propagation time behavior and does not change its resonance frequency.
  • the coupling opening 8 in the partition 4 between the two circular waveguide sections 5 and 6 has a cross-sectional jump. It is expedient to turn the area of the coupling opening with the smaller cross section to that resonator circuit which has the smaller quality of the two coupled to one another, in order not to further reduce this quality by enlarging the coupling opening. For this reason, in the exemplary embodiment described here, the area 11 of the coupling opening 8 with the smaller cross section faces the circular waveguide 5 with the smaller quality.
  • the coupling degree of the coupling opening 8 is approximately 0.014 if it has a small diameter of 4.8 mm and a large diameter of 12 mm, and the coupling degree of the coupling opening 7 is approximately 0.2 if it has a cross section of 8 mm.
  • the coupling degree of the coupling opening 8 is approximately 0.025 with a small diameter of 5.8 mm and a large diameter of 12 mm, and the coupling degree of the coupling opening 6 is approximately 0.3 with a cross section of 8.5 mm.

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Abstract

Eine Anordnung zum Entzerren der Dämpfung und der Laufzeit eines in Hohlleitertechnik ausgeführten Mikrowellenfilters, wobei an den Filterhohlleiter (1) über eine Koppelöffnung (7) ein mindestens zeikreisiger Hohlraumresonator (3) angekoppelt ist, ist so ausgebildet, daß der mehrkreisige Hohlraumresonator (3) mit leistungsabsorbierenden Abstimmelementen (10) versehen ist, mittels derer alle Resonatorkreise auf nahezu die gleiche Güte abgestimmt sind, daß mindestens eine der die Hohlleiterabschnitte (5, 6) des Hohlraumresonators (3) miteinander koppelnden Koppelöffnungen (7, 8) einen gestuften Querschnitt hat, daß seitlich in die Koppelöffnung (8) im Bereich (12) des größeren Querschnitts mindestens zwei bezüglich der Hohlleiterlängsachse symmetrisch angeordnete Schrauben (13, 14) hineinragen, welche in Abhängigkeit von ihrer Eindringtiefe das Laufzeitverhalten des Entzerrers beeinflussen.An arrangement for equalizing the damping and the transit time of a microwave filter implemented in waveguide technology, wherein an at least zic-circle cavity resonator (3) is coupled to the filter waveguide (1) via a coupling opening (7) is designed in such a way that the multi-circuit cavity resonator (3) is included Power-absorbing tuning elements (10) is provided, by means of which all resonator circuits are tuned to almost the same quality that at least one of the coupling openings (7, 8) coupling the waveguide sections (5, 6) of the cavity resonator (3) has a stepped cross section that At least two screws (13, 14) protrude laterally into the coupling opening (8) in the area (12) of the larger cross-section and influence the runtime behavior of the equalizer depending on their penetration depth.

Description

Die vorliegende Erfindung betrifft eine Anordnung zum Ent­zerren der Dämpfung und der Laufzeit eines in Hohlleiter­technik ausgeführten Mikrowellenfilters, wobei an den Fil­terhohlleiter über eine Koppelöffnung ein mindestens zwei­kreisiger Hohlraumresonator angekoppelt ist, dessen einzel­ne Hohlleiterabschnitte ebenfalls über Koppelöffnungen mit­einander gekoppelt sind, und die Koppelöffnungen so dimen­sioniert sind, daß der Hohlraumresonator bezüglich des Laufzeitverhaltens kritisch gekoppelt ist.The present invention relates to an arrangement for equalizing the attenuation and the transit time of a microwave filter embodied in waveguide technology, wherein an at least two-circuit cavity resonator is coupled to the filter waveguide via a coupling opening, the individual waveguide sections of which are also coupled to one another via coupling openings, and the coupling openings are dimensioned in such a way that that the cavity resonator is critically coupled with respect to the runtime behavior.

Ein derartiger Entzerrer ist aus "Journal of the Franklin Institute", Vol. 292, Nr. 3, September 1971, S. 179 bis 192 bekannt. In dieser Literaturstelle ist dargelegt, wie der Verlauf der Dämpfung des Entzerrers von den Güten der ein­zelnen Resonatorkreise abhängt. Es sind dort aber keine Mittel angegeben, mit denen Dämpfung und Laufzeit des Ent­zerrers unabhängig voneinander eingestellt werden können.Such an equalizer is known from "Journal of the Franklin Institute", Vol. 292, No. 3, September 1971, pp. 179 to 192. In this reference it is shown how the course of the attenuation of the equalizer depends on the quality of the individual resonator circuits. However, there are no means specified with which the attenuation and delay time of the equalizer can be set independently of one another.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Entzer­reranordnung der eingangs genannten Art anzugeben, deren Dämpfung und Laufzeit unabhängig voneinander einstellbar sind.The invention is based on the object of specifying an equalizer arrangement of the type mentioned at the beginning, the damping and transit time of which can be set independently of one another.

Erfindungsgemäß wird diese Aufgabe durch die im Patentan­spruch 1 angegebenen kennzeichnenden Merkmale gelöst.According to the invention, this object is achieved by the characterizing features specified in patent claim 1.

Zweckmäßige Ausbildungen der Erfindung gehen aus den Un­teransprüchen hervor.Appropriate embodiments of the invention emerge from the subclaims.

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

  • Fig. 1 zeigt einen Schnitt durch einen Entzerrer,
  • Fig. 2 zeigt Laufzeitverläufe und
  • Fig. 3 Dämpfungsverläufe eines Filters mit und ohne Ent­zerrer.
Based on an embodiment shown in the drawing, the invention is explained in more detail below.
  • 1 shows a section through an equalizer,
  • Fig. 2 shows runtime profiles and
  • Fig. 3 attenuation curves of a filter with and without equalizer.

In der Fig. 1 ist ein Schnitt durch die Breitseiten eines zu einem Mikrowellenfilter gehörenden Rechteckhohlleiters 1 dargestellt, an dessen eine Breitseite 2 ein als Entzerrer dienender zweikreisiger Hohlraumresonator 3 angekoppelt ist.1 shows a section through the broad sides of a rectangular waveguide 1 belonging to a microwave filter, to the one broad side 2 of which a double-circuit cavity resonator 3 serving as an equalizer is coupled.

Dieser zweikreisige Hohlraumresonator 3 hat die Aufgabe, Laufzeit und Amplitude des den Filterhohlleiter 1 durchlau­fenden Feldes zu beeinflussen. Und zwar sollen das in Fig. 2 dargestellte Laufzeitverhalten β und das in Fig. 3 darge­stellte Dämpfungsverhalten α des Filters, deren Verläufe α ohne Entzerrer nur in einen sehr schmalen Frequenzbereich eben sind, durch den Entzerrer so geändert werden, daß sie über einen breiteren Frequenzbereich ein möglichst weitge­hend frequenzunabhängiges Verhalten (s. Kurven b) zeigen. Dieses Ziel erreicht man mit einem Entzerrer, dessen Lauf­zeitverlauf (s. Kurve c in Fig. 2) und dessen Dämpfungsver­lauf (s. Kurve c in Fig. 3) im Bereich um die Mittenfrequenz fo des Entzerrers keine Einbrüche aufweisen. Ein solches ideales Laufzeitverhalten des Entzerrers stellt sich ein, wenn der Hohlraumresonator 3 bezgl. der Laufzeit kritisch gekoppelt ist.This dual-circuit cavity resonator 3 has the task of influencing the transit time and amplitude of the field passing through the filter waveguide 1. Specifically, the runtime behavior β shown in FIG. 2 and the damping behavior α shown in FIG. 3 of the filter, whose curves α are only flat in an extremely narrow frequency range without equalizer, are to be changed by the equalizer so that they have a wider frequency range show behavior that is as independent of frequency as possible (see curves b). This goal is achieved with an equalizer whose runtime curve (see curve c in FIG. 2) and its damping curve (see curve c in FIG. 3) have no drops in the region around the center frequency f o of the equalizer. Such an ideal transit time behavior of the equalizer occurs when the cavity resonator 3 is critically coupled with respect to the transit time.

Im vorliegenden Ausführungsbeispiel besteht der Entzerrer aus zwei in axialer Richtung hintereinander angeordneten und durch eine Zwischenwand 4 voneinander getrennten etwa n · λ/2 langen Rundhohlleiterabschnitten 5 und 6. Der erste der beiden Rundhohlleiterabschnitte 5 ist über eine in die Hohlleiterbreitseite 2 eingelassene Koppelöffnung 7 an den Filterhohlleiter 1 angekoppelt. Die Koppelöffnung 7 befindet sich an einer Stelle des Filterhohlleiters 1, wo zwei senkrecht zueinander ausgerichtete Komponenten des Magnetfeldes (Hx, Hy) gleich groß sind, so daß in den ersten Rundhohlleiterabschnitt 5 ein zirkular polarisier­tes Feld einkoppelt. Beide Rundhohlleiterabschnitte 5 und 6 sind über eine zweite in der Zwischenwand 4 vorhandene Koppelöffnung 8 miteinander gekoppelt. Beide Koppelöffnun­gen 7, 8 können z.B. rechteckig, rund oder als Kreuzschlit­ze ausgebildet sein, sie müssen nur so dimensioniert sein, daß der gesamte Hohlraumresonator 3, wie bereits gesagt, bezgl. des Laufzeitverhaltens kritisch gekoppelt ist.In the present exemplary embodiment, the equalizer consists of two circular waveguide sections 5 and 6, which are arranged one behind the other in the axial direction and separated from one another by an intermediate wall 4. The first of the two circular waveguide sections 5 is connected to the via a coupling opening 7 inserted into the broad waveguide side 2 Filter waveguide 1 coupled. The coupling opening 7 is located at a point on the filter waveguide 1 where two components aligned perpendicular to one another of the magnetic field (H x , H y ) are equal, so that a circularly polarized field is coupled into the first circular waveguide section 5. Both circular waveguide sections 5 and 6 are coupled to one another via a second coupling opening 8 provided in the intermediate wall 4. Both coupling openings 7, 8 can, for example, be rectangular, round or designed as cross slots, they only have to be dimensioned such that the entire cavity 3, as already mentioned, is critically coupled with respect to the propagation time behavior.

Die Koppelöffnung 7 in der Wand 2 des Filterhohlleiters 1 ist größer als die Koppelöffnung 8 in der Zwischenwand 4, weil der Koppelgrad zwischen dem Filterhohlleiter 1 und dem ersten Rundhohlleiterabschnitt 5 größer sein soll als der Koppelgrad zwischen dem ersten und dem zweiten Rund­hohlleiterabschnitt. Der Koppelgrad der größeren Koppel­öffnung 7 liegt z.B. im Bereich von 0,2 - 0,3 und der Kop­pelgrad der kleineren Koppelöffnung 8 z.B. im Bereich von 0,014 - 0,025.The coupling opening 7 in the wall 2 of the filter waveguide 1 is larger than the coupling opening 8 in the intermediate wall 4, because the coupling degree between the filter waveguide 1 and the first circular waveguide section 5 should be greater than the coupling degree between the first and the second circular waveguide section. The coupling degree of the larger coupling opening 7 is e.g. in the range of 0.2 - 0.3 and the coupling degree of the smaller coupling opening 8 e.g. in the range of 0.014 - 0.025.

Voraussetzung dafür, daß der Dämpfungsverlauf des Hohl­raumresonators 3 ebenso wie sein Laufzeitverlauf keine Einbrüche in der Umgebung der Resonanzfrequenz fo auf­weist, ist, daß die Güten der beiden Resonatorkreise nahezu gleich groß sind. Der durch den ersten Rundhohl­leiterabschnitt 5 gebildete Resonatorkreis besitzt aber eine kleinere Güte als der durch den zweiten Rundhohl­leiterabschnitt 6 gebildete Resonatorkreis. Das liegt daran, daß der erste Resonatorkreis in den ihn begren­zenden Wandungen größere Öffnungen aufweist, nämlich die große Koppelöffnung 7 und die kleine Koppelöffnung 8, als der zweite Resonatorkreis, welcher in seiner Wandung nur von der kleinen Koppelöffnung 8 durchbrochen ist. Um nun die Güte des zweiten Resonatorkreises auf die Güte des ersten Resonatorkreises abstimmen zu können, ist in die Kurzschlußwand 9 des zweiten Rundhohlleiterab­ schnitts 6 eine Abstimmschraube 10 eingesetzt, welche aus einem leistungsabsorbierenden Material, z.B. mit ma­gnetischem Pulver gefüllte Epoxyd, besteht. Diese lei­stungsabsorbierende Abstimmschraube 10 beeinflußt nur die Dämpfung α und damit die Güte (Q∼

Figure imgb0001
) des zweiten Resona­torkreises, aber nicht dessen Laufzeitverhalten und ver­ändert auch nicht dessen Resonanzfrequenz.A prerequisite for the fact that the attenuation curve of the cavity resonator 3, like its transit time curve, has no dips in the vicinity of the resonance frequency f o is that the qualities of the two resonator circuits are almost the same size. However, the resonator circuit formed by the first circular waveguide section 5 is of a lower quality than the resonator circuit formed by the second circular waveguide section 6. The reason for this is that the first resonator circuit has larger openings in the walls delimiting it, namely the large coupling opening 7 and the small coupling opening 8, than the second resonator circuit, which is broken through in its wall only by the small coupling opening 8. In order to be able to match the quality of the second resonator circuit to the quality of the first resonator circuit, the short-circuit wall 9 of the second circular waveguide is down Section 6 uses a tuning screw 10, which consists of a power-absorbing material, for example epoxy filled with magnetic powder. This power-absorbing tuning screw 10 only affects the damping α and thus the quality (Q∼
Figure imgb0001
) of the second resonator circuit, but not its propagation time behavior and does not change its resonance frequency.

Bei dem vorliegenden Entzerrer ist neben der Abstimmung für die Dämpfung auch eine Abstimmung für die Laufzeit vorgesehen, welche so konzipiert ist, daß sie keinen Ein­fluß auf die Dämpfung hat. Die Laufzeitabstimmung ist fol­gendermaßen realisiert:
Die Koppelöffnung 8 in der Trennwand 4 zwischen den beiden Rundhohlleiterabschnitten 5 und 6 weist einen Querschnitts­sprung auf. Es ist dabei zweckmäßig, den Bereich der Koppel­öffnung mit dem kleineren Querschnitt demjenigen Resonator­kreis zuzuwenden, der von beiden miteinander gekoppelten die kleinere Güte besitzt, um diese Güte nicht durch eine Vergrößerung der Koppelöffnung noch weiter zu verringern. Aus diesem Grund ist beim hier beschriebenen Aufführungs­beispiel der Bereich 11 der Koppelöffnung 8 mit dem klei­neren Querschnitt dem Rundhohlleiter 5 mit der kleineren Güte zugewandt. Im Bereich 12 der Koppelöffnung 8 mit dem größeren Durchmesser ragen durch die Wandung des zweiten Rundhohlleiterabschnitts 6 senkrecht zu dessen Längsachse mindestens zwei symmetrisch zu der Achse ausgerichtete Schrauben 13, 14. Von der Eindringtiefe dieser Schrauben 13, 14 in das Innere des Rundhohlleiterabschnitts 6 hängt das Laufzeitverhalten des Entzerrers ab. Je tiefer die Schrauben 13, 14 in den Rundhohlleiter 6 hineingedreht werden, desto breiter wird der Laufzeitverlauf (s. Kur­ve c in Fig. 2) um die Resonanzfrequenz fo.In the present equalizer, in addition to the tuning for the damping, there is also a tuning for the running time, which is designed in such a way that it has no influence on the damping. The runtime coordination is implemented as follows:
The coupling opening 8 in the partition 4 between the two circular waveguide sections 5 and 6 has a cross-sectional jump. It is expedient to turn the area of the coupling opening with the smaller cross section to that resonator circuit which has the smaller quality of the two coupled to one another, in order not to further reduce this quality by enlarging the coupling opening. For this reason, in the exemplary embodiment described here, the area 11 of the coupling opening 8 with the smaller cross section faces the circular waveguide 5 with the smaller quality. In the area 12 of the coupling opening 8 with the larger diameter, at least two screws 13, 14 protrude through the wall of the second circular waveguide section 6 perpendicular to the longitudinal axis of the latter Runtime behavior of the equalizer. The deeper the screws 13, 14 are screwed into the circular waveguide 6, the wider the runtime profile (see curve c in FIG. 2) about the resonance frequency f o .

Bei einem Entzerrer für ein Bandpaßfilter mit z.B. 55 MHz Bandbreite beträgt der Koppelgrad der Koppelöffnung 8 ca. 0,014, wenn sie einen kleinen Durchmesser von 4,8 mm und einen großen Durchmesser von 12 mm hat, und der Koppelgrad der Koppelöffnung 7 ca. 0,2, wenn sie einen Querschnitt von 8 mm hat. Für ein Bandpaßfilter mit z.B. 110 MHz Bandbreite beträgt der Koppelgrad der Koppelöffnung 8 ca. 0,025 bei einem kleinen Durchmesser von 5,8 mm und einem großen Durchmesser von 12 mm, und der Koppelgrad der Koppelöff­nung 6 beträgt ca. 0,3 bei einem Querschnitt von 8,5 mm.In the case of an equalizer for a bandpass filter with a bandwidth of 55 MHz, for example, the coupling degree of the coupling opening 8 is approximately 0.014 if it has a small diameter of 4.8 mm and a large diameter of 12 mm, and the coupling degree of the coupling opening 7 is approximately 0.2 if it has a cross section of 8 mm. For a bandpass filter with a bandwidth of 110 MHz, for example, the coupling degree of the coupling opening 8 is approximately 0.025 with a small diameter of 5.8 mm and a large diameter of 12 mm, and the coupling degree of the coupling opening 6 is approximately 0.3 with a cross section of 8.5 mm.

[(Angaben über Abmessungen der Koppelschlitze sind fre­quenzabhängig und gelten nur für ein bestimmtes Verhält­nis von α/λgr bzw. d/λgc
α

Figure imgb0002
Breite des Rechteckhohlleiters
λgr
Figure imgb0003
Wellenlänge im Rechteckhohlleiter
d
Figure imgb0004
Durchmesser im Rundhohlleiter
λgc
Figure imgb0005
Wellenlänge im Rundhohlleiter.)][(The dimensions of the coupling slots are frequency-dependent and only apply to a specific ratio of α / λ gr or d / λ gc
α
Figure imgb0002
Width of the rectangular waveguide
λ gr
Figure imgb0003
Wavelength in the rectangular waveguide
d
Figure imgb0004
Diameter in the round waveguide
λ gc
Figure imgb0005
Wavelength in the round waveguide.)]

Claims (4)

1. Anordnung zum Entzerren der Dämpfung und der Laufzeit eines in Hohlleitertechnik ausgeführten Mikrowellen­filters, wobei an den Filterhohlleiter über eine Kop­pelöffnung ein mindestens zweikreisiger Hohlraumreso­nator angekoppelt ist, dessen einzelne Hohlleiterab­schnitte ebenfalls über Koppelöffnungen miteinander gekoppelt sind, und die Koppelöffnungen so dimensio­niert sind, daß der Hohlraumresonator bezüglich des Laufzeitverhaltens kritisch gekoppelt ist, dadurch gekennzeichnet, daß der mehrkreisige Hohlraumresona­tor (3) mit leistungsabsorbierenden Abstimmelementen (10) versehen ist, mittels derer alle Resonatorkreise auf nahezu die gleiche Güte abgestimmt sind, daß min­destens eine der die Hohlleiterabschnitte (5, 6) mit­einander koppelnden Koppelöffnungen (7, 8) einen ge­stuften Querschnitt hat, daß seitlich in die Koppel­öffnung (8) im Bereich (12) des größeren Querschnitts mindestens zwei bezüglich der Hohlleiterlängsachse symmetrisch angeordnete Schrauben (13, 14) hineinra­gen, welche in Abhängigkeit von ihrer Eindringtiefe das Laufzeitverhalten des Entzerrers beeinflussen.1. Arrangement for equalizing the attenuation and the transit time of a microwave filter implemented in waveguide technology, wherein an at least two-circuit cavity resonator is coupled to the filter waveguide via a coupling opening, the individual waveguide sections of which are also coupled to one another via coupling openings, and the coupling openings are dimensioned such that the cavity resonator is critically coupled with regard to the propagation time behavior, characterized in that the multi-circuit cavity (3) is provided with power-absorbing tuning elements (10), by means of which all resonator circuits are tuned to almost the same quality, that at least one of the waveguide sections (5, 6) with one another Coupling coupling openings (7, 8) has a stepped cross-section such that at least two screws (13, 14) project laterally into the coupling opening (8) in the region (12) of the larger cross-section, which screws (13, 14) are arranged symmetrically e depending on their penetration depth influence the runtime behavior of the equalizer. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß in den dem Filterhohlleiter (1) am entferntest liegen­den Hohlleiterabschnitt (6) des Entzerrers und zwar durch eine diesen abschließende Kurzschlußwand (9) eine Abstimmschraube (10) hineinragt, welche aus einem mit magnetischem Pulver gefüllten Epoxyd besteht.2. Arrangement according to claim 1, characterized in that in the filter waveguide (1) at the most distant waveguide section (6) of the equalizer through a short circuit wall (9) terminating this, a tuning screw (10) protrudes, which consists of a magnetic powder filled epoxy. 3. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß bei einem zweikreisigen Hohlraumresonator (3) die Kop­pelöffnung (7) zwischen dem Filterhohlleiter (1) und dem ersten Hohlleiterabschnitt (5) so dimensioniert ist, daß dort der Kopplungsgrad im Bereich von 0,2 - 0,3 liegt, und daß die Koppelöffnung (8) zwischen dem ersten Hohlleiterabschnitt (5) und dem zweiten Hohllei­terabschnitt (6) so dimensioniert ist, daß dort der Kopplungsgrad im Bereich von 0,014 - 0,025 liegt.3. Arrangement according to claim 1, characterized in that in a double-circuit cavity (3), the coupling opening (7) between the filter waveguide (1) and the first waveguide section (5) is dimensioned such that the degree of coupling there in the range of 0.2 - 0.3, and that the coupling opening (8) between the first waveguide section (5) and the second waveguide section (6) is dimensioned such that the degree of coupling there is in the range of 0.014 - 0.025. 4. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß bei einer zwischen zwei Hohlleiterabschnitten (5, 6) vorhandenen Koppelöffnung (8) mit gestuftem Querschnitt der Bereich (11) der Koppelöffnung mit dem kleineren Querschnitt demjenigen Hohlleiterabschnitt (5) zuge­wandt ist, der von beiden die geringere Güte besitzt.4. Arrangement according to claim 1, characterized in that at a between two waveguide sections (5, 6) existing coupling opening (8) with a stepped cross-section, the area (11) of the coupling opening with the smaller cross-section faces that waveguide section (5) that of both are of lower quality.
EP86109680A 1985-10-09 1986-07-15 Attenuation and delay equalizer for a waveguide filter Expired - Lifetime EP0218807B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853536001 DE3536001A1 (en) 1985-10-09 1985-10-09 DAMPING AND RUNTIME EQUALIZER FOR A SEMICONDUCTOR FILTER
DE3536001 1985-10-09

Publications (3)

Publication Number Publication Date
EP0218807A2 true EP0218807A2 (en) 1987-04-22
EP0218807A3 EP0218807A3 (en) 1988-11-30
EP0218807B1 EP0218807B1 (en) 1992-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109680A Expired - Lifetime EP0218807B1 (en) 1985-10-09 1986-07-15 Attenuation and delay equalizer for a waveguide filter

Country Status (5)

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US (1) US4731593A (en)
EP (1) EP0218807B1 (en)
JP (1) JPS6292601A (en)
CA (1) CA1258892A (en)
DE (2) DE3536001A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0736923A1 (en) * 1995-04-03 1996-10-09 Com Dev Ltd. Dispersion compensation technique and apparatus for microwave filters

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715286A1 (en) * 1987-05-08 1988-11-17 Ant Nachrichtentech DEVICE FOR COUPLING TWO SEMICONDUCTOR COMPONENTS
JPH073921B2 (en) * 1987-12-10 1995-01-18 日本電気株式会社 Waveguide bandpass filter
EP1017122A3 (en) * 1998-12-28 2003-05-28 Alcatel Microwave equaliser with internal amplitude correction
FI114251B (en) * 2000-09-22 2004-09-15 Filtronic Lk Oy resonator filter
US7569971B2 (en) 2007-10-02 2009-08-04 Delaware Capital Formation, Inc. Compensation of resonators for substrate and transducer asymmetry
US8576027B2 (en) 2007-12-25 2013-11-05 Nec Corporation Differential-common mode resonant filters
JP7255143B2 (en) * 2018-11-07 2023-04-11 富士通株式会社 Group delay compensation filter

Citations (10)

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US2485030A (en) * 1944-08-30 1949-10-18 Philco Corp High-frequency transmission system
US3289113A (en) * 1963-03-21 1966-11-29 Comp Generale Electricite Non-reciprocal attenuation equalization network using circulator having plural mismatched ports between input and output port
GB1080144A (en) * 1965-08-16 1967-08-23 English Electric Valve Co Ltd Improvements in or relating to drive arrangements for high power microwave valves
DE1278571B (en) * 1966-03-29 1968-09-26 Siemens Ag Microwave component with adjustment screw
US3699480A (en) * 1969-12-15 1972-10-17 Microwave Ass Variable rf group delay equalizer
DE2143598A1 (en) * 1971-08-31 1973-03-15 Tesla Np MICROWAVE COMPONENTS AND METHOD FOR THEIR PRODUCTION
FR2340628A1 (en) * 1976-02-04 1977-09-02 Thomson Csf Gain equaliser for UHF band waveguides - comprises lossy resonant cylindrical cavities with adjusting blade attached to waveguide
JPS5535579A (en) * 1978-09-05 1980-03-12 Nec Corp Amplitude equalizing circuit
US4251787A (en) * 1979-03-19 1981-02-17 Hughes Aircraft Company Adjustable coupling cavity filter
US4437073A (en) * 1982-02-09 1984-03-13 The United States Of America As Represented By The Secretary Of The Air Force Equalizer cavity with independent amplitude control

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485030A (en) * 1944-08-30 1949-10-18 Philco Corp High-frequency transmission system
US3289113A (en) * 1963-03-21 1966-11-29 Comp Generale Electricite Non-reciprocal attenuation equalization network using circulator having plural mismatched ports between input and output port
GB1080144A (en) * 1965-08-16 1967-08-23 English Electric Valve Co Ltd Improvements in or relating to drive arrangements for high power microwave valves
DE1278571B (en) * 1966-03-29 1968-09-26 Siemens Ag Microwave component with adjustment screw
US3699480A (en) * 1969-12-15 1972-10-17 Microwave Ass Variable rf group delay equalizer
DE2143598A1 (en) * 1971-08-31 1973-03-15 Tesla Np MICROWAVE COMPONENTS AND METHOD FOR THEIR PRODUCTION
FR2340628A1 (en) * 1976-02-04 1977-09-02 Thomson Csf Gain equaliser for UHF band waveguides - comprises lossy resonant cylindrical cavities with adjusting blade attached to waveguide
JPS5535579A (en) * 1978-09-05 1980-03-12 Nec Corp Amplitude equalizing circuit
US4251787A (en) * 1979-03-19 1981-02-17 Hughes Aircraft Company Adjustable coupling cavity filter
US4437073A (en) * 1982-02-09 1984-03-13 The United States Of America As Represented By The Secretary Of The Air Force Equalizer cavity with independent amplitude control

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 67 (E-11)[549], 20. Mai 1980, Seite 77 E 11; & JP-A-55 35 579 (NIPPON DENKI K.K.) 12-03-1980 *
R.D. WANSELOW:"Direct coupled Waveguide Resonator Equalizer Networks", Journal of the Franklin Institute, Vol.292, Nr.3, September 1971, Seiten 179-192 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0736923A1 (en) * 1995-04-03 1996-10-09 Com Dev Ltd. Dispersion compensation technique and apparatus for microwave filters

Also Published As

Publication number Publication date
US4731593A (en) 1988-03-15
JPS6292601A (en) 1987-04-28
DE3536001A1 (en) 1987-04-09
CA1258892A (en) 1989-08-29
EP0218807B1 (en) 1992-06-03
EP0218807A3 (en) 1988-11-30
DE3685540D1 (en) 1992-07-09

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