EP1004149B1 - Waveguide filter - Google Patents
Waveguide filter Download PDFInfo
- Publication number
- EP1004149B1 EP1004149B1 EP98947357A EP98947357A EP1004149B1 EP 1004149 B1 EP1004149 B1 EP 1004149B1 EP 98947357 A EP98947357 A EP 98947357A EP 98947357 A EP98947357 A EP 98947357A EP 1004149 B1 EP1004149 B1 EP 1004149B1
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- Prior art keywords
- waveguide
- filter according
- region
- filter
- waveguide filter
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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
- H01P1/211—Waffle-iron filters; Corrugated structures
Definitions
- the invention is based on a waveguide filter with a input side or output side Step transformer area as well as an area in the Height of alternating waveguide sections.
- Such a waveguide filter is known from Microwave-Filters Impedance-Matching Networks and Coupling Structures, Matthaei, Young, Jones, Mc Graw Hill Book Company 1964, pages 398 to 408, in particular Figure 7.05-8 on page 405.
- the area increases in height alternating waveguide sections there consists of a waffle iron filter structure.
- step transformers are arranged with step areas, the length of each of which is ⁇ g / 4, where ⁇ g denotes the waveguide wavelength in the pass band.
- a waveguide filter is known with step transformers on the input and output side and an intermediate area coupled Resonators in the form of a "corrugated waveguide filter" (Matthaei, Young, Jones, p. 358, 2nd paragraph) with Low pass behavior.
- US-A-3597710 shows a waveguide filter which in Step transformer area on the input and output side resonators separated by capacitive shutters has different heights that are dense successive. Between these Step transformer areas are in height alternating waveguide sections are provided.
- the waveguide filter with the measures of claim 1 allows the construction of waveguide filters with high Slope slopes and short overall length.
- waveguide filters with a high slope are used with conventional "corrugated waveguide" filter structures realize.
- the high number of elements would also increase a very high attenuation in the pass band, the especially unacceptable when used in satellites is.
- Edge steepness consists in the use of additional relatively narrow-band notch filters.
- waveguide band barriers either cavity resonators branching off from the waveguide are used, or ⁇ g '/ 4 long ( ⁇ g ' waveguide wavelength in the blocked region) and short-circuited stub lines at the end (Matthaei, Young, Jones; pages 725 to 768).
- the distance between the resonators or stub lines is odd multiples of ⁇ g '/ 4. If, for example, three filter circuits were used, at least ⁇ g '/ 2 would be added to the total length of a conventional low-pass filter.
- the width and depth of the restricted area in a more flexible manner Be adjusted in ways.
- the waveguide filter according to the invention has a very short overall length.
- the entire structure can be manufactured using cost-effective milling technology and, with suitable dimensions, does not require any adjustment elements.
- the filter according to the invention is particularly suitable for the suppression of unwanted secondary signals from Wandering tubes in communications satellites as it is short Overall length both immediately above the pass band as well as in a very large frequency spacing Barrier damping delivers.
- Waveguide sections can be called "corrugated waveguide” Web waveguide filter area (ridged waveguide) or as Waffle iron filter area can be designed.
- the Design as a waffle iron filter area has the additional advantage that in the area of the second and third Harmonics are also attenuated signal components that spread in the form of higher waveguide modes.
- the signals of the individual are in communication satellites Broadcast channels with the help of suitably connected narrowband Channel filter routed to a common busbar (Output multiplexer) and from there to the antenna guided.
- Those used as transmit amplifiers However, traveling wave tubes produce in addition to the useful signal unwanted secondary signals (noise or harmonic of the Transmission signal), which is only in a greatly weakened form Antenna.
- the channel filter is a bad one Have wide selection, additional low-pass filters be inserted in the transmission branch. Particularly high There are requirements for the blocking attenuation of these filters in the reception bands of the satellite, e.g. tapes II and III at 14 or 18 Ghz ( Figure 3).
- Volume II is with current generation of satellites very close above Transmission band I, in which the low-pass filter its Passband has. At the transition to the restricted area an extremely high slope is therefore required. At the same time, the filter must also be used for the second one and third harmonics (bands IV and V) at 24 and 35 Ghz have a high blocking attenuation. All of these demands are to be observed with the filter according to the invention.
- the filter according to the invention provides an optimal one Compromise between electrical and mechanical (mass, Volume) properties.
- Figure 1 shows an example of a waveguide filter according to the invention in a longitudinal section. It consists of an input and an output-side step transformer area 1 or 3 and an intermediate area 2 consisting of a chain of short rectangular waveguide sections with alternating small and large heights, the small sections acting as parallel capacitors and the large ones as series inductors.
- the step transformer areas 1 and 3 serve to adapt the waveguide to be connected, the dimensions of which are designed for the useful band.
- a bandstop 4 or 5 is integrated according to the invention, which is preferably at a jump point of a step transformer - in the exemplary embodiment between the waveguide section of height b2 and the waveguide section b3, or accordingly between the waveguide section of height b5 and b6 - is arranged.
- Such a bandstop preferably consists of geometrically closely spaced blocking members 41, 42, 43 or 51, 52, 53, here in the form of stub lines short-circuited at the end with a length of approximately ⁇ g '/ 4.
- the waveguide low-pass filter shown in FIG. 1 can be, for example, an ordinary "corrugated filter” or preferably - as shown in Figure 2 - a waffle iron filter.
- the waffle iron filter has the additional advantage that it also dampens signal components in the region of the second and third harmonics (bands IV and V in FIG. 3) which propagate in the form of higher waveguide modes.
- Both filter types generally have a low input impedance, ie they are designed for the connection cross section ax b4, with b4 being significantly smaller than the further connection heights b1 and b6.
- b4 being significantly smaller than the further connection heights b1 and b6.
- the input and output locking elements each exhibit symmetrical locking behavior in pairs.
- the lengths of the stub lines are shown asymmetrical.
- Waffle iron filters can also be a Web waveguide filter structure (ridged waveguide) provided his.
- the measures of the invention are not on applications limited for rectangular waveguides. So the invention also with filters in coaxial line technology, for example, the one from ANT messages Reports, Issue 2, December 1984, pages 36 to 41, in particular Figure 10, known filter type can be used.
- Step transformer area are omitted, especially if the desired connecting waveguide in height with the input or Initial height of area 2 matches.
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Description
Die Erfindung geht aus von einem Hohlleiterfilter mit einem eingangsseitigen oder ausgangsseitigen Stufentransformatorbereich sowie einem Bereich sich in der Höhe abwechselnder Hohlleiterabschnitte.The invention is based on a waveguide filter with a input side or output side Step transformer area as well as an area in the Height of alternating waveguide sections.
Ein solches Hohlleiterfilter ist bekannt aus Microwave-Filters Impedance-Matching Networks and Coupling Structures, Matthaei, Young, Jones, Mc Graw Hill Book Company 1964, Seiten 398 bis 408, insbesondere Figur 7.05-8 auf Seite 405. Der Bereich sich in der Höhe abwechselnder Hohlleiterabschnitte besteht dort aus einer Waffeleisenfilterstruktur. Jeweils eingangs-und ausgangsseitig dieser Struktur sind Stufentransformatoren angeordnet mit Stufenbereichen, deren Länge jeweils λg/4 beträgt, wobei λg die Hohlleiterwellenlänge im Durchlaßbereich bezeichnet.Such a waveguide filter is known from Microwave-Filters Impedance-Matching Networks and Coupling Structures, Matthaei, Young, Jones, Mc Graw Hill Book Company 1964, pages 398 to 408, in particular Figure 7.05-8 on page 405. The area increases in height alternating waveguide sections there consists of a waffle iron filter structure. On the input and output sides of this structure, step transformers are arranged with step areas, the length of each of which is λ g / 4, where λ g denotes the waveguide wavelength in the pass band.
Aus ANT Nachrichtentechnische Berichte, Heft 5, November
1988, Seiten 114 bis 120 ist ein Hohlleiterfilter bekannt
mit eingangs- und ausgangsseitigen Stufentransformatoren
sowie einem dazwischenliegendem Bereich gekoppelter
Resonatoren in Form eines "corrugated waveguide filters"
(Matthaei, Young, Jones, S. 358, 2. Absatz) mit
Tiefpaßverhalten.From ANT Nachrichtenentechnischeberichte,
Die US-A-3597710 zeigt einen Hohlleiterfilter, der im eingangs- und ausgangsseitigen Stufentransformatorbereich durch kapazitive Blenden getrennte Resonatoren unterschiedlicher Höhe aufweist, die dicht aufeinanderfolgen. Zwischen diesen Stufentransformatorenbereichen sind sich in der Höhe abwechselnde Hohlleiterabschnitte vorgesehen.US-A-3597710 shows a waveguide filter which in Step transformer area on the input and output side resonators separated by capacitive shutters has different heights that are dense successive. Between these Step transformer areas are in height alternating waveguide sections are provided.
Das Hohlleiterfilter mit den Maßnahmen des Anspruchs 1
gestattet den Aufbau von Hohlleiterfiltern mit hohen
Flankensteilheiten und geringer Baulange.The waveguide filter with the measures of
Hohlleiterfilter mit hoher Flankensteilheit sind prinzipiell mit herkömmlichen "corrugated waveguide"-Filterstrukturen zu realisieren. Dies würde jedoch eine sehr hohe Zahl von Elementen, d.h. in Kette geschalteten kurzen Rechteckhohlleiterabschnitten mit abwechselnd kleiner und großer Höhe und damit eine große Baulänge und Masse erfordern. Die hohe Elementezahl würde darüberhinaus zu einer sehr hohen Dämpfung im Durchlaßbereich führen, die insbesondere beim Einsatz in Satelliten nicht vertretbar ist.In principle, waveguide filters with a high slope are used with conventional "corrugated waveguide" filter structures realize. However, this would be a very high number of Elements, i.e. short connected in chain Rectangular waveguide sections with alternately smaller and great height and thus a great length and mass require. The high number of elements would also increase a very high attenuation in the pass band, the especially unacceptable when used in satellites is.
Eine andere Möglichkeit zur Erzeugung hoher. Flankensteilheiten besteht im Einsatz zusätzlicher relativ schmalbandiger Bandsperrfilter. Bei bekannten Ausführungsformen von Hohlleiterbandsperren werden entweder vom Hohlleiter abzweigende Hohlraumresonatoren verwendet oder λg'/4 lange (λg' Hohlleiterwellenlänge im Sperrbereich) und am Ende kurzgeschlossene Stichleitungen (Matthaei, Young, Jones; Seiten 725 bis 768). Der Abstand zwischen den Resonatoren bzw. Stichleitungen beträgt dabei ungerade Vielfache von λg'/4. Beim Einsatz von z.B. drei Filterkreisen würden damit zu der Gesamtlänge eines herkömmlichen Tiefpaßfilters noch mindestens λg'/2 hinzukommen.Another way to generate high. Edge steepness consists in the use of additional relatively narrow-band notch filters. In known embodiments of waveguide band barriers, either cavity resonators branching off from the waveguide are used, or λ g '/ 4 long (λ g ' waveguide wavelength in the blocked region) and short-circuited stub lines at the end (Matthaei, Young, Jones; pages 725 to 768). The distance between the resonators or stub lines is odd multiples of λ g '/ 4. If, for example, three filter circuits were used, at least λ g '/ 2 would be added to the total length of a conventional low-pass filter.
Bei der Erfindung werden hingegen geometrisch dicht aufeinanderfolgende Sperrglieder verwendet, die darüber hinaus noch in den/die Stufentransformator/en integriert sind. Diese beiden Maßnahmen liefern unmittelbar oberhalb des Durchlaßbereiches einen Sperrbereich mit sehr hoher Sperrdämpfung und reduzieren gleichzeitig die Anzahl der erforderlichen Stufen. Damit lassen sich insbesondere Hohlleitertiefpaßfilter mit sehr kurzer Baulänge aufbauen.In the invention, however, are geometrically tight successive locking members used above it also integrated in the step transformer / s are. These two measures deliver immediately above the passband is a very high Barrier damping while reducing the number of required levels. This can be used in particular Install a waveguide low-pass filter with a very short overall length.
Wenn die Stichleitungen einer Bandsperre voneinander unterschiedliche Längen aufweisen, kann die Breite und Tiefe des Sperrbereiches den jeweiligen Anforderungen in flexibler Weise angepaßt werden.When the stubs of a bandstop from each other can have different lengths, the width and depth of the restricted area in a more flexible manner Be adjusted in ways.
Da die bei Bandsperren bekannter Ausführung üblichen Zwischenlängen von λg'/4 zwischen den Sperrgliedern/am Ende kurzgeschlossenen Stichleitungen wegfallen und darüber hinaus weniger Anpaßstufen benötigt werden, weist das erfindungsgemäße Hohlleiterfilter eine sehr kurze Baulänge auf. Die ganze Struktur kann in kostengünstiger Frästechnik hergestellt werden und erfordert bei geeigneter Dimensionierung keine Abgleichelemente.Since the intermediate lengths of λ g '/ 4 between the blocking elements / short-circuited stub lines, which are common in tape locks of known design, are eliminated and, moreover, fewer adaptation stages are required, the waveguide filter according to the invention has a very short overall length. The entire structure can be manufactured using cost-effective milling technology and, with suitable dimensions, does not require any adjustment elements.
Das Filter nach der Erfindung eignet sich insbesondere für die Unterdrückung unerwünschter Nebensignale von Wanderfeldröhren in Nachrichtensatelliten, da es bei kurzer Baulänge sowohl unmittelbar oberhalb des Durchlaßbereichs als auch in sehr großem Frequenzabstand eine hohe Sperrdämpfung liefert.The filter according to the invention is particularly suitable for the suppression of unwanted secondary signals from Wandering tubes in communications satellites as it is short Overall length both immediately above the pass band as well as in a very large frequency spacing Barrier damping delivers.
Der Bereich sich in der Höhe abwechselnder Hohlleiterabschnitte kann als "corrugated waveguide", als Steghohlleiterfilterbereich (ridged waveguide) oder als Waffeleisenfilterbereich ausgestaltet sein. Die Ausgestaltung als Waffeleisenfilterbereich hat den zusätzlichen Vorteil, daß im Bereich der zweiten und dritten Harmonischen auch noch Signalanteile gedämpft werden, die sich in Gestalt höherer Hohlleitermoden ausbreiten.The area varies in height Waveguide sections can be called "corrugated waveguide" Web waveguide filter area (ridged waveguide) or as Waffle iron filter area can be designed. The Design as a waffle iron filter area has the additional advantage that in the area of the second and third Harmonics are also attenuated signal components that spread in the form of higher waveguide modes.
In Nachrichtensatelliten werden die Signale der einzelnen Sendekanäle mit Hilfe geeignet verschalteter schmalbandiger Kanalfilter auf eine gemeinsame Sammelschiene geleitet (Ausgangsmultiplexer) und von dort weiter zur Antenne geführt. Die als Sendeverstärker eingesetzten Wanderfeldröhren produzieren jedoch neben dem Nutzsignal noch unerwünschte Nebensignale (Rauschen bzw.Harmonische des Sendesignals), die nur in stark abgeschwächter Form zur Antenne gelangen dürfen. Da die Kanalfilter eine schlechte Weitabselektion aufweisen, müssen zusätzliche Tiefpaßfilter in deri Sendezweig eingefügt werden. Besonders hohe Anforderungen an die Sperrdämpfung dieser Filter bestehen in den Empfangsbändern des Satelliten, z.B. die Bänder II und III bei 14 bzw. 18 Ghz (Figur 3). Das Band II liegt bei der derzeitigen Satellitengeneration sehr dicht oberhalb des Sendebandes I, in dem das Tiefpaßfilter seinen Durchlaßbereich aufweist. Beim Übergang in den Sperrbereich ist daher eine extrem hohe Flankensteilheit gefordert. Gleichzeitig muß das Filter aber auch noch bei der zweiten und dritten Harmonischen (Bänder IV und V) bei 24 und 35 Ghz eine hohe Sperrdämpfung aufweisen. Alle diese Forderungen sind mit dem Filter nach der Erfindung einzuhalten.The signals of the individual are in communication satellites Broadcast channels with the help of suitably connected narrowband Channel filter routed to a common busbar (Output multiplexer) and from there to the antenna guided. Those used as transmit amplifiers However, traveling wave tubes produce in addition to the useful signal unwanted secondary signals (noise or harmonic of the Transmission signal), which is only in a greatly weakened form Antenna. Because the channel filter is a bad one Have wide selection, additional low-pass filters be inserted in the transmission branch. Particularly high There are requirements for the blocking attenuation of these filters in the reception bands of the satellite, e.g. tapes II and III at 14 or 18 Ghz (Figure 3). Volume II is with current generation of satellites very close above Transmission band I, in which the low-pass filter its Passband has. At the transition to the restricted area an extremely high slope is therefore required. At the same time, the filter must also be used for the second one and third harmonics (bands IV and V) at 24 and 35 Ghz have a high blocking attenuation. All of these demands are to be observed with the filter according to the invention.
Weitere wesentliche Eigenschaften eines solchen Eingangtiefpaßfilters sind die Abmessungen und die Masse. Das erfindungsgemäße Filter liefert einen optimalen Kompromiß zwischen den elektrischen und mechanischen (Masse, Volumen) Eigenschaften.Other essential properties of such Input low pass filters are the dimensions and the mass. The filter according to the invention provides an optimal one Compromise between electrical and mechanical (mass, Volume) properties.
Zeichnungen
Anhand der Zeichnungen werden Ausführungsbeispiele der
Erfindung näher erläutert. Es zeigen:
Figur 1 zeigt ein Beispiel für ein erfindungsgemäßes
Hohlleiterfilter in einem Längsschnitt. Es besteht aus einem
eingangs- und einem ausgangsseitigen
Stufentransformatorbereich 1 bzw. 3 sowie einem
Zwischenbereich 2 bestehend aus einer Kette von kurzen
Rechteckhohlleiterabschnitten mit abwechselnd kleiner und
großer Höhe, wobei die kleinen Abschnitte als
Parallelkapazitäten und die großen als Serieninduktivitäten
wirken. Die Stufentransformatorbereiche 1 und 3 dienen zur
Anpassung der anzuschließenden Hohlleiter, deren Abmessungen
für das Nutzband ausgelegt sind. In den
Stufentransformatorbereichen 1 und 3 ist erfindungsgemäß
jeweils eine Bandsperre 4 bzw. 5 integriert, die
vorzugsweise an einer Sprungstelle eines
Stufentransformators - im Ausführungsbeispiel zwischen dem
Hohlleiterabschnitt der Höhe b2 und dem Hohlleiterabschnitt
b3, bzw. entsprechend zwischen den Hohlleiterabschnitt der
Höhe b5 und b6 - angeordnet ist. Eine solche Bandsperre
besteht vorzugsweise aus geometrisch dicht
aufeinanderfolgenden Sperrgliedern 41, 42, 43 bzw. 51, 52,
53, hier in Form von am Ende kurzgeschlossenen
Stichleitungen mit einer Länge von etwa λg'/4. Geometrisch
dicht aufeinanderfolgend bedeutet hier, daß die sonst
üblichen Zwischenlängen von mindestens λg'/4 wegfallen,
d.h., der Abstand der Sperrglieder untereinander klein
gegenüber λg'/4 ist. Diese Stichleitungen erscheinen in der
Draufsicht gemäß Figur 2 als über die gesamte
Hohlleiterbreite verlaufende Stege. Bei dem in Figur 1
dargestellten Hohlleitertiefpaßfilter kann es sich z.B. um
ein gewöhnliches "corrugated filter" oder vorzugsweise - wie
in Figur 2 dargestellt - um ein Waffeleisenfilter handeln.
Das Waffeleisenfilter hat den zusätzlichen Vorteil, daß es
im Bereich der zweiten und dritten Harmonischen (Bänder IV,
und V in Figur 3) auch noch Signalanteile dämpft, die sich
in Gestalt höherer Hohlleitermoden ausbreiten. Beide
Filtertypen haben im allgemeinen eine niedrige
Eingangsimpedanz, d.h. sie sind für den Anschlußquerschnitt
a x b4 ausgelegt, wobei b4 deutlich kleiner ist als die
weiteren Anschlußhöhen b1 bzw. b6. Zur Anpassung an die
äußeren Querschnitte sind daher normalerweise - je nach
gewünschter Durchlaßbandbreite und Querschnittsverhältnis-auf
jeder Seite mehrere Transformationsstufen erforderlich.
Die Integration einer Bandsperre mit n (hier n =3) sehr
dicht aufeinanderfolgenden Stichleitungen ergibt bei
geeigneter Dimensionierung eine hohe Durchlaßbandbreite bei
geringerer Stufenzahl und liefert gleichzeitig unmittelbar
oberhalb des Durchlaßbereiches (Band II) die geforderte hohe
Sperrdämpfung. Im dargestellten Beispiel benötigt man für
das Höhenverhältnis b1/b4 nur zwei Stufen der Höhen b2 und
b3 und für das Verhältnis b6/b4 nur eine Stufe der Höhe b5.
Die Länge der Stufen beträgt ebenso wie bei normalen
Stufentransformatoren ungefähr λg/4, wobei λg die
Hohlleiterwellenlänge im Durchlaßbereich bezeichnet. Aus
Figur 3, die den Dämpfungs- und Anpassungsverlauf a über der
Frequenz f zusammen mit den für die Übertragung vorgesehenen
Frequenzbändern I bis V zeigt, ist die extrem hohe
Flankensteilheit beim Übergang vom Durchlaß -in den
Sperrbereich ersichtlich. Figure 1 shows an example of a waveguide filter according to the invention in a longitudinal section. It consists of an input and an output-side
Um gute Übertragungseigenschaften zu erzielen, sollten die eingangs- und ausgangsseitigen Sperrglieder jeweils paarweise symmetrisches Sperrverhalten aufweisen. Bei unterschiedlichen Hohlleiterhöhen, wie in Figur 1 dargestellt, sind die Längen der Stichleitungen allerdings unsymmetrisch.To achieve good transmission properties, the input and output locking elements each exhibit symmetrical locking behavior in pairs. At different waveguide heights, as in FIG. 1 the lengths of the stub lines are shown asymmetrical.
Anstelle eines "corrugated waveguide-filters" oder eines
Waffeleisenfilters kann auch eine
Steghohlleiterfilterstruktur (ridged waveguide) vorgesehen
sein. Die Maßnahmen der Erfindung sind nicht auf Anwendungen
bei Rechteckhohlleitern beschränkt. So kann die Erfindung
auch bei Filtern in koaxialer Leitungstechnik,
beispielsweise bei dem aus ANT-Nachrichtentechnische
Berichte, Heft 2, Dezember 1984, Seiten 36 bis 41,
insbesondere Bild 10, bekannten Filtertyp angewendet werden.Instead of a "corrugated waveguide filter" or one
Waffle iron filters can also be a
Web waveguide filter structure (ridged waveguide) provided
his. The measures of the invention are not on applications
limited for rectangular waveguides. So the invention
also with filters in coaxial line technology,
for example, the one from ANT messages
Reports,
Es kann auch der eingangsseitige oder ausgangsseitige
Stufentransformatorbereich entfallen, insbesondere wenn der
gewünschte Anschlußhohlleiter in der Höhe mit der Eingangs-oder
Ausgangshöhe des Bereiches 2 übereinstimmt.It can also be the input or output side
Step transformer area are omitted, especially if the
desired connecting waveguide in height with the input or
Initial height of
Das Vorsehen von Sperrgliedern kann natürlich zusätzlich
auch an weiteren Sprungstellen des/der
Stufentransformators/Stufentransformatoren 1 bzw. 3
erfolgen.The provision of locking members can of course be additional
also at other jump points of the
Step transformers /
Claims (12)
- Waveguide filter having a stepped transformer region (1, 3) on the input or output side and having a region of waveguide sections (2) of alternating height, characterized in that at least one bandstop filter (4, 5) in the form of at least two blocking elements (41, 42, 43; 51, 52, 53) which follow one another closely is integrated in the stepped transformer region (1, 3), the interval between which blocking elements is small in comparison to one quarter of the waveguide wavelength λg in the pass band.
- Waveguide filter according to Claim 1, characterized in that the bandstop filter (4, 5) is composed of spur lines, which follow one another closely and are short-circuited at the end.
- Waveguide filter according to Claim 2, characterized in that the spur lines of the blocking elements (41, 42, 43; 51, 52, 53) of a bandstop filter have different lengths to one another.
- Waveguide filter according to one of Claims 1 to 3, characterized in that the blocking elements (41, 42, 43; 51, 52, 53) are provided in the stepped transformer regions (1, 3) on both the input and output sides.
- Waveguide filter according to one of Claims 2 to 4, characterized in that the spur lines which are short-circuited at the end have a length of approximately λg'/4 where λg' denotes the waveguide wavelength in the blocking band of the bandstop filter.
- Waveguide filter according to one of Claims 1 to 5, characterized in that the blocking elements (41, 42, 43; 51, 52, 53) are arranged on both the input side and the output side of the region of the waveguide sections (2) of alternating height, and are each at a distance of approximately λg/4. away from this region.
- Waveguide filter according to one of Claims 1 to 6, characterized in that the region of waveguide sections (2) of alternating height is in the form of a ridge waveguide filter region or a waffle-iron filter region.
- Waveguide filter according to one of Claims 6 or 7, characterized in that the blocking elements (41, 42, 43; 51, 52, 53) on the input and output sides of the bandstop filters each have a blocking response which is symmetrical in pairs.
- Waveguide filter according to one of Claims 1 to 8, characterized in that the blocking elements (41, 42, 43; 51, 52, 53) of a bandstop filter (4) are arranged at a step-change point on the stepped transformer region (1, 3) on the input or output side.
- Waveguide filter according to one of Claims 1 to 8, characterized in that the blocking elements (41, 42, 43; 51, 52, 53) of a bandstop filter (4) are arranged at a step-change point on the stepped transformer region (1, 3) on the input and on the output side.
- Use of the waveguide filter according to one of Claims 1 to 10 as a low-pass filter in the transmission path of a radio-frequency power amplifier.
- Use of the waveguide filter according to Claim 11 in a travelling wave tube amplifier for a satellite, whose transmission and reception bands are relatively close to one another.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19736367 | 1997-08-21 | ||
| DE19736367A DE19736367A1 (en) | 1997-08-21 | 1997-08-21 | Waveguide filter for HF power amplifier |
| PCT/DE1998/002133 WO1999010947A1 (en) | 1997-08-21 | 1998-07-28 | Waveguide filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1004149A1 EP1004149A1 (en) | 2000-05-31 |
| EP1004149B1 true EP1004149B1 (en) | 2001-11-21 |
Family
ID=7839709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98947357A Expired - Lifetime EP1004149B1 (en) | 1997-08-21 | 1998-07-28 | Waveguide filter |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6285267B1 (en) |
| EP (1) | EP1004149B1 (en) |
| CA (1) | CA2300937C (en) |
| DE (2) | DE19736367A1 (en) |
| WO (1) | WO1999010947A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6169466B1 (en) * | 1999-05-10 | 2001-01-02 | Com Dev Limited | Corrugated waveguide filter having coupled resonator cavities |
| US7009469B2 (en) * | 2002-06-28 | 2006-03-07 | Harris Corporation | Compact waveguide filter and method |
| JP2004164904A (en) * | 2002-11-11 | 2004-06-10 | Nec Micro Hakan Kk | Electron tube for communication |
| FR2889358B1 (en) * | 2005-07-27 | 2009-06-05 | Agence Spatiale Europeenne | MICROWAVE BAND REMOVAL FILTER FOR OUTPUT MULTIPLEXER |
| JP4671905B2 (en) * | 2006-05-16 | 2011-04-20 | 日本無線株式会社 | Combined waveguide filter |
| ES2335633B1 (en) | 2008-01-21 | 2011-01-17 | Tafco Metawireless, S.L. | PASS-LOW FILTER FOR ELECTROMAGNETIC SIGNS. |
| US8598960B2 (en) | 2009-01-29 | 2013-12-03 | The Boeing Company | Waveguide polarizers |
| EP2618421A1 (en) * | 2012-01-19 | 2013-07-24 | Huawei Technologies Co., Ltd. | Surface Mount Microwave System |
| CN102709680B (en) * | 2012-06-19 | 2014-08-06 | 成都赛纳赛德科技有限公司 | Waveguide fed slot antenna |
| DE102012020576B4 (en) * | 2012-10-22 | 2018-02-15 | Tesat-Spacecom Gmbh & Co.Kg | Microwave filter with adjustable bandwidth |
| RU2517397C1 (en) * | 2013-01-09 | 2014-05-27 | Алексей Валентинович Палицин | Higher frequencies waveguide filter |
| US9531048B2 (en) * | 2013-03-13 | 2016-12-27 | Space Systems/Loral, Llc | Mode filter |
| CN103531876A (en) * | 2013-10-25 | 2014-01-22 | 东南大学 | Efficient transmission line of surface plasmon |
| DE102015122895A1 (en) | 2015-12-29 | 2017-06-29 | Mician Global Engineering GbR (vertretungsberechtigter Gesellschafter Dr. Ralf Beyer, 28203 Bremen) | Waveguide filter, multiplexer or demultiplexer with a waveguide filter, method for adjusting a waveguide filter and method for splitting or combining frequency ranges |
| CN108550968B (en) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | Waveguide low-pass harmonic suppressor with pits |
| CN108493545B (en) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | Take waffle mode harmonic suppressor of rectangle post |
| CN108808187A (en) * | 2018-06-05 | 2018-11-13 | 电子科技大学中山学院 | Unilateral short circuit stub filter |
| CN112713371B (en) * | 2020-12-10 | 2022-03-04 | 北京无线电测量研究所 | Waveguide filter and use method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3271706A (en) * | 1964-12-07 | 1966-09-06 | Gen Electric | Microwave filter |
| US3597710A (en) * | 1969-11-28 | 1971-08-03 | Microwave Dev Lab Inc | Aperiodic tapered corrugated waveguide filter |
| US3845422A (en) * | 1973-04-17 | 1974-10-29 | Microwave Dev Labor | Stop band filter |
| DE3483681D1 (en) * | 1983-11-24 | 1991-01-10 | Ant Nachrichtentech | MICROWAVE COUNTERFLOW CONVERTER. |
| CA1259676A (en) | 1986-12-04 | 1989-09-19 | Chuck K. Mok | 14/12 ghz duplexer |
| US5142255A (en) * | 1990-05-07 | 1992-08-25 | The Texas A&M University System | Planar active endfire radiating elements and coplanar waveguide filters with wide electronic tuning bandwidth |
| US6169466B1 (en) * | 1999-05-10 | 2001-01-02 | Com Dev Limited | Corrugated waveguide filter having coupled resonator cavities |
-
1997
- 1997-08-21 DE DE19736367A patent/DE19736367A1/en not_active Withdrawn
-
1998
- 1998-07-28 DE DE59802752T patent/DE59802752D1/en not_active Expired - Fee Related
- 1998-07-28 CA CA002300937A patent/CA2300937C/en not_active Expired - Fee Related
- 1998-07-28 US US09/486,179 patent/US6285267B1/en not_active Expired - Fee Related
- 1998-07-28 WO PCT/DE1998/002133 patent/WO1999010947A1/en active IP Right Grant
- 1998-07-28 EP EP98947357A patent/EP1004149B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6285267B1 (en) | 2001-09-04 |
| DE59802752D1 (en) | 2002-02-21 |
| DE19736367A1 (en) | 1999-02-25 |
| CA2300937A1 (en) | 1999-03-04 |
| CA2300937C (en) | 2004-05-11 |
| WO1999010947A1 (en) | 1999-03-04 |
| EP1004149A1 (en) | 2000-05-31 |
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