EP1045470B1 - Bandpass filter with multiple coaxial cavities - Google Patents
Bandpass filter with multiple coaxial cavities Download PDFInfo
- Publication number
- EP1045470B1 EP1045470B1 EP20000103911 EP00103911A EP1045470B1 EP 1045470 B1 EP1045470 B1 EP 1045470B1 EP 20000103911 EP20000103911 EP 20000103911 EP 00103911 A EP00103911 A EP 00103911A EP 1045470 B1 EP1045470 B1 EP 1045470B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- negative feedback
- coupled
- loop
- resonators
- circles
- Prior art date
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
Definitions
- the invention relates to a multi-circuit band filter coupled circles, of which at least two HF circles not consecutive in terms of HF over one Coupling pipe section dipping into both pot circles are.
- Such band filters are known. Through the negative feedback Distribute from HF circles not consecutive pot circles the edges of the transmission curve and increases thus the selectivity of the band filter. You take in Buy that the filter's pass curve in the stop band too has lower and higher frequencies attenuation minima (so-called CAUER characteristic), while the transmission curve non-negative band filter to the bottom and the a monotonically increasing damping curve towards the upper blocking area (TSCHEBYSCHEFF characteristic) has.
- negative feedback band filters are the counter-circles to be coupled via a coaxial Line piece connected, the inner conductor for decoupling and for coupling the HF in the two connected pot circles forms an inductive loop into the short-short circuit or high current zone of the relevant pot circle dips.
- the degree of negative feedback is determined by the size of the determines the respective loop area, because the larger this the larger the magnetic field enclosed by the loop and thus the amplitude of the coupled wave.
- the mechanical length of the coaxial cable chosen so that its electrical length equal to ⁇ / 2 or an odd number Multiples of it is.
- Such negative feedback bandpass filters are however not usable for higher HF powers, because because the coaxial cable goes through the loops at its beginning and its end is short-circuited, forms along the Cable a standing wave, so that on the cable At least one point creates a pronounced current maximum.
- DE-A-2 161 792 discloses a multi-circuit band filter consisting of coupled pot circles, of which two HF circles which are not successive in terms of HF are mutually coupled via a line piece immersed in both pot circles (capacitive pin couplings c 1.4 and c 4.7 ), and Pot circles are arranged so that at least the pot circles to be coupled adjoin each other.
- EP-A-101 369 is a multi-circuit cavity filter with dielectric resonators and one Negative feedback in the form of a line piece is known, which has a slot in a partition engages and causes an inductive and capacitive coupling at the same time.
- the invention has for its object a band filter type mentioned at the beginning with a high-performance negative feedback to provide.
- the immersion depth of the pipe section in the both pot circles are adjustable. On the one hand, this enables the setting of the degree of negative feedback, on the other hand the simple change in the degree of negative feedback after a change the frequency tuning of the filter.
- the This proposal has the further advantage that the Amounts of inductive and capacitive coupling in coordination the filter to another frequency in the same way to change. For example, if the filter is known per se Way tuned to a lower center frequency the negative feedback of the relevant pot circles is constant The area in the one circle of the pot must remain immersing loop can be enlarged. this happens by increasing the immersion depth of the pipe section. With the one causing the capacitive coupling is also shifted Stamp in the other circle. Because at the same time the immersion depth of the inner conductor of this pot circle enlarged to tune to the desired, lower frequency capacitive coupling remains constant. The proposed negative feedback is therefore over a wide range Frequency range effective.
- the band filter comprises six pot circles in the form of resonators A1 to A6 in a U-shaped arrangement.
- the HF is over the Connection 1 coupled into the first resonator A1 and via the connection 2 is coupled out of the resonator A6.
- RF- successive resonators are known per se Way over bridges 3 to be seen only in Fig. 2 with each other coupled, their immersion depth in the respective resonators is adjustable for setting the degree of coupling and the can be fixed using locking screws 4. Also the immersion depth the inner resonator is for frequency tuning adjustable.
- the resonators A2 and A5 are according to the present proposal HF-fed back. To do this, dive into the resonator A2 a line piece 21, one hand in the Short circuit or high current zone near the wall in the resonator A2 forms a line loop and on the other hand by one Slot 41 in the common partition 40 of these two Is passed through resonators and in the resonator A5 in a stamp 22 ends.
- This arrangement turns the Resonator A2 RF energy inductively coupled and capacitive and therefore with a phase rotation of 180 ° to achieve the desired negative feedback is coupled into the resonator A5.
- the immersion depth of the line piece 21 is by means of the rod 23 changeable. At the set immersion depth is the pipe section through the locking screw 24 fixable.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Die Erfindung betrifft ein mehrkreisiges Bandfilter aus miteinander gekoppelten Topfkreisen, von denen mindestens zwei HF-mäßig nicht aufeinanderfolgende Topfkreise über ein in beide Topfkreise eintauchendes Leitungsstück gegengekoppelt sind.The invention relates to a multi-circuit band filter coupled circles, of which at least two HF circles not consecutive in terms of HF over one Coupling pipe section dipping into both pot circles are.
Derartige Bandfilter sind bekannt. Durch die Gegenkopplung von HF-mäßig nicht aufeinanderfolgenden Topfkreisen versteilern sich die Flanken der Durchlaßkurve und erhöht sich damit die Selektivität des Bandfilters. Dabei nimmt man in Kauf, daß die Durchlaßkurve des Filters im Sperrbereich zu niedrigeren und höheren Frequenzen Dämpfungsminima aufweist (sogenannte CAUER-Charakteristik), während die Durchlaßkurve nicht gegengekoppelter Bandfilter zu dem unteren und dem oberen Sperrbereich hin einen monoton wachsenden Dämpfungsverlauf (TSCHEBYSCHEFF-Charakteristik) hat. Bei mehrkreisigen, gegengekoppelten Bandfiltern nach dem Stand der Technik sind die gegenzukoppelnden Topfkreise über ein koaxiales Leitungsstück verbunden, dessen Innenleiter zur Auskopplung und zur Einkopplung der HF in den beiden verbundenen Topfkreisen eine induktive Schleife bildet, die in die Kurz-Kurzschluß- bzw. Hochstromzone des betreffenden Topfkreises eintaucht. Der Gegenkopplungsgrad wird durch die Größe der jeweiligen Schleifenfläche bestimmt, denn je größer diese ist, desto größer ist das von der Schleife umschlossene Magnetfeld und damit die Amplitude der übergekoppelten Welle. Um die notwendige Phasendrehung von 180° zu erhalten, wird die mechanische Länge des Koaxialkabels so gewählt, daß seine elektrische Länge gleich λ/2 oder ein ungradzahliges Vielfaches davon ist. Derartige gegengekoppelte Bandfilter sind jedoch für höhere HF-Leistungen nicht verwendbar, denn weil das Koaxialkabel durch die Schleifen an seinem Anfang und seinem Ende kurzgeschlossen ist, bildet sich längs des Kabels eine stehende Welle aus, so daß auf dem Kabel an zumindest einer Stelle ein ausgeprägtes Strommaximum entsteht.Such band filters are known. Through the negative feedback Distribute from HF circles not consecutive pot circles the edges of the transmission curve and increases thus the selectivity of the band filter. You take in Buy that the filter's pass curve in the stop band too has lower and higher frequencies attenuation minima (so-called CAUER characteristic), while the transmission curve non-negative band filter to the bottom and the a monotonically increasing damping curve towards the upper blocking area (TSCHEBYSCHEFF characteristic) has. With multi-circuit, negative feedback band filters according to the state of the art are the counter-circles to be coupled via a coaxial Line piece connected, the inner conductor for decoupling and for coupling the HF in the two connected pot circles forms an inductive loop into the short-short circuit or high current zone of the relevant pot circle dips. The degree of negative feedback is determined by the size of the determines the respective loop area, because the larger this the larger the magnetic field enclosed by the loop and thus the amplitude of the coupled wave. In order to obtain the necessary phase rotation of 180 ° the mechanical length of the coaxial cable chosen so that its electrical length equal to λ / 2 or an odd number Multiples of it is. Such negative feedback bandpass filters are however not usable for higher HF powers, because because the coaxial cable goes through the loops at its beginning and its end is short-circuited, forms along the Cable a standing wave, so that on the cable At least one point creates a pronounced current maximum.
DE-A- 2 161 792 offenbart ein mehrkreisiges Bandfilter aus miteinander gekoppelten Topfkreisen, von denen zwei HF-mäßig nicht aufeinanderfolgende Topfkreise über ein in beide Topfkreise eintauchendes Leitungsstück gegengekoppelt sind (kapazitive Stiftkopplungen c1,4 und c4,7), und die Topfkreise so angeordnet sind, daß zumindest die gegenzukoppelnden Topfkreise aneinandergrenzen.DE-A-2 161 792 discloses a multi-circuit band filter consisting of coupled pot circles, of which two HF circles which are not successive in terms of HF are mutually coupled via a line piece immersed in both pot circles (capacitive pin couplings c 1.4 and c 4.7 ), and Pot circles are arranged so that at least the pot circles to be coupled adjoin each other.
Aus EP-A-101 369 ist ein mehrkreisiges Hohlraumfilter mit dielektrischen Resonatoren und einer Gegenkopplung in Form eines Leitungsstücks bekannt, das einen Schlitz in einer Trennwand durchgreift und eine induktive und kapazitive Kopplung gleichzeitig bewirkt.From EP-A-101 369 is a multi-circuit cavity filter with dielectric resonators and one Negative feedback in the form of a line piece is known, which has a slot in a partition engages and causes an inductive and capacitive coupling at the same time.
Der Erfindung liegt die Aufgabe zugrunde, ein Bandfilter der eingangs genannten Gattung mit einer leistungsfesten Gegenkopplung zu versehen.The invention has for its object a band filter type mentioned at the beginning with a high-performance negative feedback to provide.
Diese Aufgabe ist erfindungsgemäß durch ein Filter nach dem Anspruch gelöst,This object is achieved according to the invention by a filter according to the claim
Auf diese Weise wird ein außerhalb des Filters verlaufendes, die gegengekoppelte HF-Leistung führendes Koaxialkabel und das dadurch verursachte Erwärmungsproblem vermieden. Stattdessen ist das Leitungsstück auf eine Schleife, die eine induktive Kopplung bewirkt und auf einen Stempel, der eine kapazitive Kopplung bewirkt, reduziert. Der Übergang von der induktiven zu der kapazitiven Kopplung bewirkt gleichzeitig die notwendige Phasendrehung um 180°. Voraussetzung für diese Art der Gegenkopplung ist allerdings, daß die gegenzukoppelnden Topfkreise mechanisch benachbart liegen. Das läßt sich in der Regel leicht durch eine U-förmige Anordnung der Topfkreise erzielen.In this way, a running outside the filter the negative feedback RF power leading coaxial cable and avoided the heating problem caused thereby. Instead is the line piece on a loop, the one inductive coupling and on a stamp that a capacitive coupling causes, reduced. The transition from the inductive to capacitive coupling causes at the same time the necessary phase rotation by 180 °. requirement for this type of negative feedback is, however, that the negative feedback Pot circles are mechanically adjacent. The can usually be easily by a U-shaped arrangement of the pot circles.
Die Eintauchtiefe des Leitungsstücks in die beiden Topfkreise ist einstellbar. Das ermöglicht einerseits die Einstellung des Gegenkopplungsgrads, andererseits die einfache Veränderung des Gegenkopplungsgrads bei Änderung der Frequenzabstimmung des Filters. In beiden Fällen hat der vorliegende Vorschlag den weiteren Vorteil, daß sich die Beträge von induktiver und kapazitiver Kopplung bei Abstimmung des Filters auf eine andere Frequenz in gleicher Weise ändern. Wird beispielsweise das Filter in an sich bekannter Weise auf eine niedrigere Mittenfrequenz abgestimmt und soll dabei die Gegenkopplung der betreffenden Topfkreise konstant bleiben, so muß hierzu die Fläche der in den einen Topfkreis eintauchenden Schleife vergrößert werden. Dies geschieht durch Vergrößerung der Eintauchtiefe des Leitungsstücks. Mit diesem verschiebt sich auch der die kapazitive Kopplung bewirkende Stempel in dem anderen Topfkreis. Weil sich gleichzeitig die Eintauchtiefe des Innenleiters dieses Topfkreises zur Abstimmung auf die gewünschte, niedrigere Frequenz vergrößert hat, bleibt die kapazitive Kopplung konstant. Die vorgeschlagene Gegenkopplung ist deshalb über einen weiten Frequenzbereich wirksam.The immersion depth of the pipe section in the both pot circles are adjustable. On the one hand, this enables the setting of the degree of negative feedback, on the other hand the simple change in the degree of negative feedback after a change the frequency tuning of the filter. In both cases the This proposal has the further advantage that the Amounts of inductive and capacitive coupling in coordination the filter to another frequency in the same way to change. For example, if the filter is known per se Way tuned to a lower center frequency the negative feedback of the relevant pot circles is constant The area in the one circle of the pot must remain immersing loop can be enlarged. this happens by increasing the immersion depth of the pipe section. With the one causing the capacitive coupling is also shifted Stamp in the other circle. Because at the same time the immersion depth of the inner conductor of this pot circle enlarged to tune to the desired, lower frequency capacitive coupling remains constant. The The proposed negative feedback is therefore over a wide range Frequency range effective.
In der Zeichnung ist ein Ausführungsbeispiel eines Bandfilters nach der Erfindung schematisch vereinfacht dargestellt. Es zeigt:
- Figur 1
- das Bandfilter im Schnitt längs der Linie A-A in Fig. 2 und
- Figur 2
- eine Aufsicht auf das Bandfilter.
- Figure 1
- the band filter on average along the line AA in Fig. 2 and
- Figure 2
- a supervision of the band filter.
Das Bandfilter umfaßt sechs Topfkreise in Form von Resonatoren
A1 bis A6 in U-förmiger Anordnung. Die HF wird über den
Anschluß 1 in den ersten Resonator A1 eingekoppelt und über
den Anschluß 2 aus dem Resonator A6 ausgekoppelt. HF-mäßig
aufeinanderfolgende Resonatoren sind in an sich bekannter
Weise über nur in Fig. 2 zu sehende Brücken 3 miteinander
gekoppelt, deren Eintauchtiefe in die jeweiligen Resonatoren
zur Einstellung des Kopplungsgrades veränderbar ist und die
über Feststellschrauben 4 festsetzbar sind. Auch die Eintauchtiefe
der Resonatorinnenleiter ist zur Frequenzabstimmung
einstellbar. Wie der Schnitt in Fig. 1 zeigt, bestehen
die Resonatorinnenleiter hierzu aus einem feststehenden
Stück 11 und einem in diesem teleskopisch geführten und mit
diesem kontaktierten Stück 12, das über eine Stange 13
verschiebbar ist, die mittels einer Feststellschraube 14
festsetzbar ist.The band filter comprises six pot circles in the form of resonators
A1 to A6 in a U-shaped arrangement. The HF is over the
Connection 1 coupled into the first resonator A1 and via
the connection 2 is coupled out of the resonator A6. RF-
successive resonators are known per se
Way over bridges 3 to be seen only in Fig. 2 with each other
coupled, their immersion depth in the respective resonators
is adjustable for setting the degree of coupling and the
can be fixed using locking screws 4. Also the immersion depth
the inner resonator is for frequency tuning
adjustable. As the section in Fig. 1 shows, exist
the resonator inner conductor from a
Infolge der U-förmigen mechanischen Anordnung der Resonatoren
A1 bis A6 sind die HF-mäßig nicht aufeinanderfolgenden
Resonatoren A1 und A6 sowie A2 und A5 mechanisch benachbart.
Die Resonatoren A2 und A5 sind nach dem vorliegenden Vorschlag
HF-mäßig gegengekoppelt. Hierzu taucht in den Resonator
A2 ein Leitungsstück 21 ein, das einerseits in der
wandnahen Kurzschluß- bzw. Hochstromzone in dem Resonator A2
eine Leitungsschleife bildet und andererseits durch einen
Schlitz 41 in der gemeinsamen Trennwand 40 dieser beiden
Resonatoren hindurchgeführt ist und in dem Resonator A5 in
einem Stempel 22 endet. Durch diese Anordnung wird aus dem
Resonator A2 HF-Energie induktiv ausgekoppelt und kapazitiv
und deshalb mit einer Phasendrehung von 180° zur Erzielung
der gewünschten Gegenkopplung in den Resonator A5 eingekoppelt.
Die Eintauchtiefe des Leitungsstücks 21 ist mittels
der Stange 23 veränderbar. In der eingestellten Eintauchtiefe
ist das Leitungsstück durch die Feststellschraube 24
festsetzbar.As a result of the U-shaped mechanical arrangement of the resonators
A1 to A6 are the RF not consecutive
Resonators A1 and A6 as well as A2 and A5 mechanically adjacent.
The resonators A2 and A5 are according to the present proposal
HF-fed back. To do this, dive into the resonator
A2 a
Claims (1)
- A multiple-circuit band-pass filter made of mutually coupled cavity resonators (A1 to A6), of which at least two cavity resonators (A2, A5) which are not mutually successive in respect of high frequency are coupled by negative feedback via a line element (21) immersing in both cavity resonators, with the cavity resonators (A1 through A6) being arranged in such a way that at least the cavity resonators (A2, A5) to be coupled by negative feedback are adjacent to each other, characterized in that the line element (21) is arranged as a loop immersing into the one cavity resonator, which loop is connected with the stamp (22) in the other cavity resonator (A5) through a slot (41) formed in the separating wall (40) of the adjacent cavity resonators, and that the immersion depth of the line element (21) comprising the loop and the stamp is changeable.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19916605A DE19916605C1 (en) | 1999-04-13 | 1999-04-13 | Multi-circuit band filter made of pot circles |
DE19916605 | 1999-04-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1045470A2 EP1045470A2 (en) | 2000-10-18 |
EP1045470A3 EP1045470A3 (en) | 2001-11-07 |
EP1045470B1 true EP1045470B1 (en) | 2004-03-03 |
Family
ID=7904372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000103911 Expired - Lifetime EP1045470B1 (en) | 1999-04-13 | 2000-02-24 | Bandpass filter with multiple coaxial cavities |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1045470B1 (en) |
DE (1) | DE19916605C1 (en) |
ES (1) | ES2215503T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8143973B2 (en) * | 2007-12-27 | 2012-03-27 | Pl Technologies Ag | Cavity filter coupling system |
DE102011016487A1 (en) | 2011-04-08 | 2012-10-11 | Spinner Gmbh | RF filter arrangement and method for varying an electromagnetic coupling strength between two cup-circle resonators |
DE102013020428A1 (en) | 2013-12-05 | 2015-06-11 | Kathrein-Werke Kg | High frequency filter in coaxial design |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2325401C3 (en) * | 1973-05-18 | 1985-05-15 | Georg Dr.-Ing. 8152 Feldkirchen-Westerham Spinner | Coupling arrangement between high frequency circuits |
FR2531815B1 (en) * | 1982-08-10 | 1985-08-02 | Thomson Csf | BANDPASS FILTER WITH DIELECTRIC RESONATORS, HAVING NEGATIVE COUPLING BETWEEN RESONATORS |
DE3329057A1 (en) * | 1983-08-11 | 1985-02-28 | Siemens AG, 1000 Berlin und 8000 München | Coaxial-lead filter, comb-lead filter or interdigital filter having at least four resonators |
US4890078A (en) * | 1988-04-12 | 1989-12-26 | Phase Devices Limited | Diplexer |
-
1999
- 1999-04-13 DE DE19916605A patent/DE19916605C1/en not_active Expired - Fee Related
-
2000
- 2000-02-24 EP EP20000103911 patent/EP1045470B1/en not_active Expired - Lifetime
- 2000-02-24 ES ES00103911T patent/ES2215503T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2215503T3 (en) | 2004-10-16 |
DE19916605C1 (en) | 2001-01-18 |
EP1045470A2 (en) | 2000-10-18 |
EP1045470A3 (en) | 2001-11-07 |
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