EP0309850A2 - Spurious electromagnetic-mode suppression arrangement in a waveguide installation - Google Patents

Spurious electromagnetic-mode suppression arrangement in a waveguide installation Download PDF

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Publication number
EP0309850A2
EP0309850A2 EP88115332A EP88115332A EP0309850A2 EP 0309850 A2 EP0309850 A2 EP 0309850A2 EP 88115332 A EP88115332 A EP 88115332A EP 88115332 A EP88115332 A EP 88115332A EP 0309850 A2 EP0309850 A2 EP 0309850A2
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EP
European Patent Office
Prior art keywords
waveguide
mode
mode filter
cross
arrangement according
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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.)
Granted
Application number
EP88115332A
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German (de)
French (fr)
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EP0309850A3 (en
EP0309850B1 (en
Inventor
Wolfgang Dipl.-Ing. Löw
Uwe Dipl.-Ing. Leupelt
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Siemens AG
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Siemens AG
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Publication of EP0309850A3 publication Critical patent/EP0309850A3/en
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Publication of EP0309850B1 publication Critical patent/EP0309850B1/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
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/162—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion absorbing spurious or unwanted modes of propagation

Definitions

  • the invention relates to an arrangement for eliminating disturbing electromagnetic waveforms in waveguide systems with waveguide sections of the same or different rectangular cross-section, in which a surface resistance forming a mode filter is arranged in the waveguide from a plate-shaped metal-coated dielectric carrier element which is located in the cross-sectional center in the plane of the broadside extends over a suitable length in the axial direction to the waveguide.
  • a surface resistance forming a mode filter is arranged in the waveguide from a plate-shaped metal-coated dielectric carrier element which is located in the cross-sectional center in the plane of the broadside extends over a suitable length in the axial direction to the waveguide.
  • One way to reduce attenuation in waveguides is to operate the line above its uniqueness limit.
  • DE 31 30 209 A1 describes a line for the transmission of electromagnetic energy in the microwave range with a waveguide of rectangular or elliptical cross-section, which operates in a frequency range lying far above its unambiguity limit and in its end ranges is each connected to a pyramid-shaped waveguide transition, the free end of which has a cross section such that it lies in the unambiguous range for the electromagnetic wave to be transmitted.
  • This embodiment is directed in particular to a rectangular waveguide of the designation SIRAL, which is operated in the ambiguous low-damping frequency range and has a mode filter for damping higher wave types, consisting of a damping plate located in the middle of the plane of the broad side and held in a foam body that completely fills the cross section. Losses and transferable performance are strongly influenced by the foam material.
  • the invention has for its object to provide a solution for an arrangement of the type mentioned in the least possible loss, free of higher wave types energy transfer.
  • the mode filter is subdivided into two half-mode filters, one of which is inserted flush in the respective end region of two waveguide sections to be connected to one another, which are only made by narrow lateral webs made of foam which rest against their inner wall are held.
  • the mode filter according to the invention which attenuates excited wave types directly at the point at which they are generated and has almost no influence on the basic wave type modulated with the signal.
  • the mode filter as shown in FIGS. 1 to 3, consists of a damping plate with a wall thickness of 0.05 to 2 mm, preferably 0.2 mm, of a dielectric substrate, in particular of glass fiber reinforced epoxy resin with a vapor-deposited metal layer, the surface resistance of which is 100 is up to 600 ⁇ .
  • This damping plate is designated 2 in the mode filter 1 for a straight waveguide section according to FIG. 2, 5 for a mode filter 4 in the cone for a waveguide transition according to FIG. 3.
  • the damping plate 2.5 is in the rectangular waveguide (SIRAL) in the waveguide center parallel to the broad side of the waveguide arranged (perpendicular to the E-vector of the basic wave type) and is held only by small webs of foam 3 or 6, which rest on the narrow sides of the waveguide. These contribute very little to the damping of the basic wave type, since the high-performance cross-sectional area of the waveguide remains almost completely free of disturbing and damping carrier material. The losses of the mode filter are therefore very low.
  • the mode filter is inserted into the waveguide transitions at both ends of the line, which enable connection to devices and antennas, and into waveguide couplings when connecting waveguide sections of the same cross-sectional dimensions in order to dampen the wave types that arise due to the small inhomogeneities of the waveguide.
  • a particular advantage of the mode filter according to the invention is that a half-mode filter can be inserted flush into each waveguide part in a simple manner when producing a waveguide.
  • the assembly for this is shown in FIGS. 4 and 5, a semi-mode filter 1 being first inserted flush into the laterally offset waveguide ends 7, 8, and then the waveguide is connected when the waveguide ends are in the same position (FIG. 5).
  • FIGS. 4 and 5 The assembly for this is shown in FIGS. 4 and 5, a semi-mode filter 1 being first inserted flush into the laterally offset waveguide ends 7, 8, and then the waveguide is connected when the waveguide ends are in the same position (FIG. 5).
  • FIG. 6 shows a corresponding illustration of the connection of a waveguide 8 to a waveguide transition 9, a semi-mode filter 1 according to FIG. 2 being inserted in the end region at the interface in the waveguide end piece 8 and a semimode filter 4 in conical shape according to FIG. 3 being inserted in the waveguide transition 9.

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Abstract

In directional radio and satellite radio, energy lines which have as small a loss as possible are required between apparatuses and antennas. Waveguides are used for this purpose in the higher frequency bands (GHz band). In order to reduce their attenuation at frequencies above 10 GHz it is possible to operate them in a low attenuation manner in overmoded operation and to use a mode filter to attenuate higher wave-mode types. In order to achieve an energy transmission which has as little loss as possible and is free of higher wave-mode types, the invention provides a bisected mode filter, each half mode filter being inserted in a flush terminating manner in the respective end region of two waveguide sections which are to be connected to one another and being held only by narrow, lateral foam webs resting on their inner wall. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Anordnung zur Beseitigung störender elektromagnetischer Schwingungsformen in Hohlleiter­anlagen mit Hohlleiterabschnitten gleichen oder unterschiedli­chen Rechteck-Querschnitts, bei der im Hohlleiter ein ein Moden­filter bildender Flächenwiderstand aus einem plattenförmigen me­tallbeschichteten dielektrischen Trägerelement angeordnet ist, der sich in Querschnittsmitte in der Ebene der Breitseite über eine geeignete Länge in axialer Richtung zum Hohlleiter er­streckt. Eine solche Anordnung ist im wesentlichen aus der DE-AS 1 244 259 bekannt.The invention relates to an arrangement for eliminating disturbing electromagnetic waveforms in waveguide systems with waveguide sections of the same or different rectangular cross-section, in which a surface resistance forming a mode filter is arranged in the waveguide from a plate-shaped metal-coated dielectric carrier element which is located in the cross-sectional center in the plane of the broadside extends over a suitable length in the axial direction to the waveguide. Such an arrangement is essentially known from DE-AS 1 244 259.

Im Richtfunk und Satellitenfunk ist es wichtig, eine möglichst verlustarme Energieleitung zwischen Geräten und Antennen einzu­setzen. In Übertragungsbereichen oberhalb 3 GHz werden deshalb Hohlleiter verwendet, die im Grundwellenbereich arbeiten. Bei Frequenzen oberhalb 10 GHz ist auch die Dämpfung von Hohllei­tern, die im eindeutigen Frequenzbereich betrieben werden, meist zu hoch, so daß bei längeren Antennenzuleitungen ein erheblicher Verlust an Sende- und Empfangsenergie entsteht. So beträgt z. B. die Dämpfung der Hohlleitung R 220 im Bereich 18,7 GHz mehr als 50 dB/100m.In directional radio and satellite radio it is important to use a low-loss power line between devices and antennas. In transmission ranges above 3 GHz, waveguides are therefore used that work in the fundamental wave range. At frequencies above 10 GHz, the attenuation of waveguides that are operated in the clear frequency range is usually too high, so that there is a considerable loss of transmission and reception energy with longer antenna feed lines. So is z. B. the attenuation of the waveguide R 220 in the 18.7 GHz range more than 50 dB / 100m.

Eine Möglichkeit, die Dämpfung in Hohlleitern zu verringern, ist der Betrieb der Leitung oberhalb seiner Eindeutigkeitsgrenze.One way to reduce attenuation in waveguides is to operate the line above its uniqueness limit.

In der DE 31 30 209 A1 ist eine Leitung zur Übertragung von elektromagnetischer Energie im Mikrowellenbereich beschrieben mit einem Hohlleiter rechteckförmigen oder elliptischen Quer­schnitts, der in einem weit oberhalb seiner Eindeutigkeitsgren­ze liegenden Frequenzbereich arbeitet und in seinen Endbereichen jeweils mit einem pyramidenförmigen Hohlleiterübergang verbun­den ist, deren freies Ende einen Querschnitt solcher Abmessung aufweist, daß er für die zu übertragende elektromagnetische Welle im Eindeutigkeitsbereich liegt. Diese Ausführungsform ist im besonderen auf einen Rechteckhohlleiter der Bezeichnung SIRAL gerichtet, der im mehrdeutigen dämpfungsarmen Frequenzbe­reich betrieben wird und zur Dämpfung höherer Wellentypen ein Modenfilter aufweist, bestehend aus einer in der Ebene der Breitseite mittig liegenden, in einem den Querschnitt voll aus­füllenden Schaumstoffkörper gehaltenen Dämpfungsplatte. Ver­luste und übertragbare Leistung werden stark durch das Schaum­material mitbestimmt.DE 31 30 209 A1 describes a line for the transmission of electromagnetic energy in the microwave range with a waveguide of rectangular or elliptical cross-section, which operates in a frequency range lying far above its unambiguity limit and in its end ranges is each connected to a pyramid-shaped waveguide transition, the free end of which has a cross section such that it lies in the unambiguous range for the electromagnetic wave to be transmitted. This embodiment is directed in particular to a rectangular waveguide of the designation SIRAL, which is operated in the ambiguous low-damping frequency range and has a mode filter for damping higher wave types, consisting of a damping plate located in the middle of the plane of the broad side and held in a foam body that completely fills the cross section. Losses and transferable performance are strongly influenced by the foam material.

Der Erfindung liegt die Aufgabe zugrunde, für eine Anordnung der eingangs genannten Art eine Lösung für eine möglichst ver­lustarme, von höheren Wellentypen freie Energieübertragung zu schaffen.The invention has for its object to provide a solution for an arrangement of the type mentioned in the least possible loss, free of higher wave types energy transfer.

Diese Aufgabe wird gemäß der Erfindung in der Weise gelöst, daß das Modenfilter in zwei Halbmodenfilter unterteilt ist, von de­den je eines im jeweiligen Endbereich von zwei miteinander zu verbindenden Hohlleiterabschnitten bündig abschließend einge­setzt ist, die lediglich durch an deren Innenwandung anliegende schmale seitliche Stege aus Schaumstoff gehalten sind.This object is achieved according to the invention in such a way that the mode filter is subdivided into two half-mode filters, one of which is inserted flush in the respective end region of two waveguide sections to be connected to one another, which are only made by narrow lateral webs made of foam which rest against their inner wall are held.

Vorteilhafte Ausgestaltungen und Weiterbildungen des Erfindungs­gegenstandes sind in den Unteransprüchen angegeben.Advantageous refinements and developments of the subject matter of the invention are specified in the subclaims.

Nachstehend wird die Erfindung anhand von in der Zeichnung dar­gestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawing.

Es zeigen

  • Figuren 1 und 2 ein Halbmodenfilter für einen Hohlleiter in der Vorderansicht und Draufsicht,
  • Figur 3 ein Halbmodenfilter für einen Hohlleiterüber­gang in einer Draufsicht,
  • Figuren 4 und 5 in zwei Teildarstellungen die Montage von Halbmodenfiltern in zwei Hohlleiterenden und
  • Figur 6 die Verbindung eines Hohlleiterendstücks mit einem Hohlleiterübergang mit eingesetzten Halbmodenfiltern.
Show it
  • FIGS. 1 and 2 show a half-mode filter for a waveguide in a front view and a top view,
  • FIG. 3 shows a top view of a half-mode filter for a waveguide transition,
  • Figures 4 and 5 in two partial representations of the assembly of half-mode filters in two waveguide ends and
  • Figure 6 shows the connection of a waveguide end piece with a waveguide transition with inserted half-mode filters.

Höhere Wellentypen, die zusätzlich zum Grundwellentyp an inhomo­genen Stellen einer Hohlleitung entstehen können, bewirken reso­nanzartige Einbrüche der Durchgangsdämpfung, die die Übertra­gungseigenschaften der Leitung verschlechtern können. Zur Dämp­fung dieser höheren Wellentypen ist das erfindungsgemäße Moden­filter vorgesehen, das angeregte Wellentypen direkt am Ort ihrer Entstehung dämpft und den mit dem Signal modulierten Grundwellentyp fast nicht beeinflußt.Higher wave types, which can arise in addition to the basic wave type at inhomogeneous points of a hollow line, cause resonance-like drops in the transmission loss, which can impair the transmission properties of the line. To attenuate these higher wave types, the mode filter according to the invention is provided, which attenuates excited wave types directly at the point at which they are generated and has almost no influence on the basic wave type modulated with the signal.

Das Modenfilter, wie es in den Figuren 1 bis 3 dargestellt ist, besteht aus einer Dämpfungsplatte mit einer Wandstärke von 0,05 bis 2 mm, vorzugsweise 0,2 mm aus einem dielektrischen Substrat, insbesondere aus glasfaserverstärktem Epoxidharz mit aufgedampfter Metallschicht, dessen Oberflächenwiderstand 100 bis 600Ω beträgt. Diese Dämpfungsplatte ist beim Modenfilter 1 für einen geraden Hohlleiterabschnitt gemäß Figur 2 mit 2 be­zeichnet, für ein Modenfilter 4 im Konus für einen Hohlleiter­übergang gemäß Figur 3 mit 5. Die Dämpfungsplatte 2,5 ist im Rechteckhohlleiter (SIRAL) in Hohlleitermitte parallel zur Breit­seite des Hohlleiters angeordnet (senkrecht zum E-Vektor des Grundwellentyps) und wird lediglich durch kleine Stege aus Schaumstoff 3 bzw. 6 gehalten, die an den Schmalseiten des Hohl­leiters aufliegen. Diese tragen nur sehr wenig zur Dämpfung des Grundwellentyps bei, da der leistungsführende Querschnittsbe­reich des Hohlleiters fast völlig von störendem und dämpfendem Trägermaterial frei bleibt. Die Verluste des Modenfilters sind dadurch sehr gering.The mode filter, as shown in FIGS. 1 to 3, consists of a damping plate with a wall thickness of 0.05 to 2 mm, preferably 0.2 mm, of a dielectric substrate, in particular of glass fiber reinforced epoxy resin with a vapor-deposited metal layer, the surface resistance of which is 100 is up to 600Ω. This damping plate is designated 2 in the mode filter 1 for a straight waveguide section according to FIG. 2, 5 for a mode filter 4 in the cone for a waveguide transition according to FIG. 3. The damping plate 2.5 is in the rectangular waveguide (SIRAL) in the waveguide center parallel to the broad side of the waveguide arranged (perpendicular to the E-vector of the basic wave type) and is held only by small webs of foam 3 or 6, which rest on the narrow sides of the waveguide. These contribute very little to the damping of the basic wave type, since the high-performance cross-sectional area of the waveguide remains almost completely free of disturbing and damping carrier material. The losses of the mode filter are therefore very low.

Das Modenfilter wird in die Hohlleiterübergänge an beiden Enden der Leitung, die den Anschluß an Geräte und Antennen ermögli­chen, sowie in Hohlleiterkupplungen bei der Verbindung von Hohl­leiterabschnitten gleicher Querschnittsabmessungen eingescho­ben, um die an den kleinen Inhomogenitäten des Hohlleiters entstehenden Wellentypen wegzudämpfen.The mode filter is inserted into the waveguide transitions at both ends of the line, which enable connection to devices and antennas, and into waveguide couplings when connecting waveguide sections of the same cross-sectional dimensions in order to dampen the wave types that arise due to the small inhomogeneities of the waveguide.

Ein besonderer Vorteil des erfindungsgemäßen Modenfilters be­steht darin, daß beim Herstellen einer Hohlleiter in einfacher Weise in jedes Hohlleiterteil ein Halbmodenfilter bündig einge­schoben werden kann. Die Montage hierfür zeigen die Figuren 4 und 5, wobei zunächst in die seitlich versetzten Hohlleiter­enden 7, 8 jeweils ein Halbmodenfilter 1 bündig eingeschoben wird und dann bei achsengleicher Lage der Hohlleiterenden die Verbindung der Hohlleiter erfolgt (Figur 5). Damit wird also die bei der Montage erwünschte einfache Verbindung der beiden Hohlleiterschnittstellen durch seitliches Übereinanderschieben und anschließende Kupplungsmontage problemlos ermöglicht. Flan­sche zur Verbindung der beiden Hohlleiterabschnitte wurden in der vereinfachten Darstellung nicht mit eingezeichnet.A particular advantage of the mode filter according to the invention is that a half-mode filter can be inserted flush into each waveguide part in a simple manner when producing a waveguide. The assembly for this is shown in FIGS. 4 and 5, a semi-mode filter 1 being first inserted flush into the laterally offset waveguide ends 7, 8, and then the waveguide is connected when the waveguide ends are in the same position (FIG. 5). Thus, the simple connection of the two waveguide interfaces, which is desired during assembly, is made possible without any problems by sliding one over the other and subsequent coupling assembly. Flanges for connecting the two waveguide sections were not included in the simplified illustration.

Figur 6 zeigt eine entsprechende Darstellung der Verbindung eines Hohlleiters 8 mit einem Hohlleiterübergang 9, wobei in deren Endbereich an der Schnittstelle im Hohlleiterendstück 8 ein Halbmodenfilter 1 gemäß Figur 2 und im Hohlleiterübergang 9 ein Halbmodenfilter 4 in Konusform gemäß Figur 3 eingeschoben ist.FIG. 6 shows a corresponding illustration of the connection of a waveguide 8 to a waveguide transition 9, a semi-mode filter 1 according to FIG. 2 being inserted in the end region at the interface in the waveguide end piece 8 and a semimode filter 4 in conical shape according to FIG. 3 being inserted in the waveguide transition 9.

Claims (4)

1. Anordnung zur Beseitigung störender elektromagnetischer Schwingungsformen in Hohlleiteranlagen mit Hohlleiterabschnitten gleichen oder unterschiedlichen Rechteck-Querschnitts, bei der im Hohlleiter ein ein Modenfilter bildender Flächenwiderstand aus einem plattenförmigen metallbeschichteten dielektrischen Trägerelement angeordnet ist, der sich in Querschnittsmitte in der Ebene der Breitseite über eine geeignete Länge in axialer Richtung zum Hohlleiter erstreckt,
dadurch gekennzeichnet, daß das Modenfil­ter in zwei Halbmodenfilter unterteilt ist, von denen je eines im jeweiligen Endbereich von zwei miteinander zu verbindenden Hohlleiterabschnitten bündig abschließend eingesetzt ist, die lediglich durch an deren Innenwandung anliegende schmale seit­liche Stege aus Schaumstoff gehalten sind.1. Arrangement for eliminating disturbing electromagnetic waveforms in waveguide systems with waveguide sections of the same or different rectangular cross-section, in which a surface resistance forming a mode filter is arranged in the waveguide from a plate-shaped metal-coated dielectric carrier element, which is in the cross-sectional center in the plane of the broad side over a suitable length extends in the axial direction to the waveguide,
characterized in that the mode filter is subdivided into two half-mode filters, one of which is inserted flush in the respective end region of two waveguide sections to be connected to one another, which are only held by narrow lateral webs made of foam which rest against their inner walls. 2. Anordnung nach Anspruch 1,
dadurch gekennzeichnet, daß die Moden-bzw. Halbmodenfilter aus einer Dämpfungsplatte geringer Dicke (0,05 bis 2mm) aus einem dielektrischen Substrat, vorzugsweise aus glasfaserverstärktem Epoxidharz mit aufgedampfter Metallschicht bestehen, dessen Oberflächenwiderstand vorzugsweise zwischen 100 und 600Ω liegt.2. Arrangement according to claim 1,
characterized in that the mode or. Half-mode filters made of a damping plate of small thickness (0.05 to 2mm) made of a dielectric substrate, preferably made of glass fiber reinforced epoxy resin with an evaporated metal layer, the surface resistance of which is preferably between 100 and 600Ω. 3. Anordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Moden-bzw. Halbmodenfilter hinsichtlich der Form der Dämpfungsplatte ent­sprechend dem Hohlleiterlängsschnitt rechteckig oder mit koni­schem Verlauf ausgebildet sind.3. Arrangement according to claim 1 or 2,
characterized in that the mode or. Half-mode filters are rectangular or conical with respect to the shape of the damping plate according to the waveguide longitudinal section. 4. Anordnung nach einem der Ansprüche 1 bis 3,
gekennzeichnet durch seine Verwendung in einem Hohlleiter, der in Übertragungsbereichen oberhalb seiner Eindeutigkeitsgrenze in einem dämpfungsarmen Frequenzbereich arbeitet (übermodiert) und an seinen Enden Hohlleiterübergänge aufweist zum Anschluß an Hohlleiter solcher Querschnittsab­messungen, für die die zu übertragende elektromagnetische Welle im Eindeutigkeitsbereich liegt.4. Arrangement according to one of claims 1 to 3,
characterized by its use in a waveguide which operates in transmission ranges above its unambiguity limit in a low-attenuation frequency range (overmodified) and has waveguide transitions at its ends for connection to waveguides of such cross-sectional dimensions for which the electromagnetic wave to be transmitted lies in the uniqueness range.
EP88115332A 1987-09-28 1988-09-19 Spurious electromagnetic-mode suppression arrangement in a waveguide installation Expired - Lifetime EP0309850B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3732678 1987-09-28
DE3732678 1987-09-28

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EP0309850A2 true EP0309850A2 (en) 1989-04-05
EP0309850A3 EP0309850A3 (en) 1990-04-25
EP0309850B1 EP0309850B1 (en) 1993-08-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996038639A1 (en) * 1995-06-02 1996-12-05 Industrial Research Limited A damped element
DE19739589A1 (en) * 1997-09-10 1999-03-11 Alsthom Cge Alcatel Mode filter for connecting two electromagnetic waveguides
WO2009030778A1 (en) * 2007-09-06 2009-03-12 Becker Technologies Gmbh Shielding device for electromagnetic radiation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7893789B2 (en) 2006-12-12 2011-02-22 Andrew Llc Waveguide transitions and method of forming components

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760171A (en) * 1951-04-20 1956-08-21 Bell Telephone Labor Inc Wave-guide mode filter
US2981906A (en) * 1957-10-14 1961-04-25 Bell Telephone Labor Inc Resistance sheet microwave device
US3088082A (en) * 1959-10-05 1963-04-30 Philco Corp Bandpass waveguide filter having iris and posts for resonating fundamental and vanes for absorbing harmonics
US4344053A (en) * 1981-02-12 1982-08-10 Litton Systems, Inc. Mode suppressor for circular waveguides utilizing a plurality of resistance cards

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760171A (en) * 1951-04-20 1956-08-21 Bell Telephone Labor Inc Wave-guide mode filter
US2981906A (en) * 1957-10-14 1961-04-25 Bell Telephone Labor Inc Resistance sheet microwave device
US3088082A (en) * 1959-10-05 1963-04-30 Philco Corp Bandpass waveguide filter having iris and posts for resonating fundamental and vanes for absorbing harmonics
US4344053A (en) * 1981-02-12 1982-08-10 Litton Systems, Inc. Mode suppressor for circular waveguides utilizing a plurality of resistance cards

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996038639A1 (en) * 1995-06-02 1996-12-05 Industrial Research Limited A damped element
DE19739589A1 (en) * 1997-09-10 1999-03-11 Alsthom Cge Alcatel Mode filter for connecting two electromagnetic waveguides
US6130586A (en) * 1997-09-10 2000-10-10 Alcatel Mode filter for connecting two electromagnetic waveguides
WO2009030778A1 (en) * 2007-09-06 2009-03-12 Becker Technologies Gmbh Shielding device for electromagnetic radiation

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Publication number Publication date
DE3883127D1 (en) 1993-09-16
EP0309850A3 (en) 1990-04-25
EP0309850B1 (en) 1993-08-11

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