EP0752732B1 - Mikrowellenfilter - Google Patents
Mikrowellenfilter Download PDFInfo
- Publication number
- EP0752732B1 EP0752732B1 EP96106998A EP96106998A EP0752732B1 EP 0752732 B1 EP0752732 B1 EP 0752732B1 EP 96106998 A EP96106998 A EP 96106998A EP 96106998 A EP96106998 A EP 96106998A EP 0752732 B1 EP0752732 B1 EP 0752732B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- resonators
- coupling
- filter
- cavity resonators
- 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
Definitions
- the present invention relates to a microwave filter, consisting of several rectangular ones arranged in one plane Cavity resonators connected to each other via inductive diaphragms are coupled, at least one overcoupling between two belonging to a main coupling route, but in it there are no adjacent cavity resonators.
- the invention has for its object a microwave filter with planar structure and inductive couplings Specify the type mentioned, the many possibilities for the implementation of filter characteristics.
- the invention is based on a filter in which all cavity resonators are arranged in one plane.
- a planar filter can remove all cavities from one Be milled out of one block. The cavities become then with a cover or the tuning elements closed a second half-shell. Manufacturing technology it is also particularly inexpensive if only inductive couplings are provided through openings realizable in the side walls of the cavity resonators are.
- H10m or Hm01- (m> 1) cavity within the main coupling path A planar filter configuration can indirectly determine the phase position a coupling on which this H10m- or Hm01 cavity resonator is not involved, so set that the filter characteristic below and above of the useful frequency band has damping poles.
- the nomenclature of the resonators R1 .... R4 corresponds to that Main coupling path of the filter.
- the drawing shows R1 ... R4 in all cavity resonators the magnetic field lines of the existing wave modes indicated by dashed lines. Between Input and output waveguides I and O and the resonators R1, R4 there are apertures Kil or K4o. Also located aperture openings for the realization of the main couplings between the resonators R1 ... R4 in sequential Signal path.
- the aperture is K12 in the side wall between the cavity resonators R1 and R2, the Aperture K231 in the side wall between the cavity resonators R2 and R3 and the aperture K34 in the side walls arranged between the cavity resonators R3 and R4.
- Another aperture K14 is between the electrically non-adjacent resonators R1 and R4, which is the coupling of part of the signal energy allowed from cavity resonator R1 to cavity resonator R4. All couplings are inductive in this planar filter structure.
- phase positions (signs) of the couplings between Cavity resonators that lead to an over-coupled Include filter section In the embodiment shown in Figure 1 it is the phase positions of the couplings between the cavity resonators R1 and R2, R2 and R3, R3 and R4.
- a cavity resonator in the main coupling path provides a resonance circuit and an ideal transformer with the transmission ratio -1. This means physically that the Direction of rotation of the field components involved in a main coupling is opposed to two resonators.
- the transmission ratio for the couplings in one such planar structure results from the sense of rotation of the magnetic involved in the corresponding coupling Field components. This results in the coupling between the cavity resonators R1 and R4 through the aperture K14 a gear ratio of -1 due to the also opposite direction of rotation of the magnetic field components in the two cavity resonators R1 and R4 and thus a negative coupling value.
- the filter structure set out above can be describe the coupling scheme shown in Figure 1. So that is a filter characteristic with constant group delay in Realizable frequency band.
- the transformation through the cavity resonator R2 is special important for the coupling K14, because in the filter structure shown in Figure 2 a positive Coupling in contrast to Figure 1 results.
- the in Figure 2 filter configuration shown, which in contrast to the Filter configuration of Figure 1 a positive coupling has, that is, the magnetic field lines of the cavity resonators R1 and R4 have the same direction of rotation, e.g. a Cauer characteristic, both above and below one or more of the filter transmission range Has damping poles.
- a four-circle filter e.g. such a Cauer filter characteristic arises, when the first cavity R1 and the fourth cavity R4 coupled (i.e.
- the cavity resonators R2 and R3 are coupled) and if the following applies to all couplings: (K12 * K34) / (K23 * K14) ⁇ 0.Filter characteristics with Attenuation poles below and above the transmission range can also be used with more than four cavity resonators realize.
- the decisive factor here is the phase position of one or more couplings, but on simple Way, as described above, by appropriate coupling an Hm01- or H10m- (m> 1) resonator adjustable is.
- the Apertures for the inductive couplings between the individual cavity resonators R5 ... R8 and the input and Output waveguides I, O are with Ki5, K56, K67, K78, K58 and K8o designated.
- This filter can also be changed the coupling of the cavity resonator R7 to the neighboring ones Cavity resonators R6 and R8 the sign of the coupling between the cavity resonators R5 and R8 (Aperture K58) can be reversed. So with the filter 3 the positive coupling, with which a Cauer filter characteristics with damping poles above and arises below the transmission area.
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Description
Claims (3)
- Mikrowellenfilter, bestehend aus mehreren in einer Ebene angeordneten rechteckigen Hohlraumresonatoren, die über induktive Blenden miteinander gekoppelt sind, wobei mindestens eine Überkopplung zwischen zwei zu einem Hauptkoppelweg gehörenden, darin aber elektrisch nicht benachbarten Hohlraumresonatoren vorhanden ist, dadurch gekennzeichnet, daß mindestens einer der im Hauptkoppelweg liegenden Hohlraumresonatoren (R1 ... R8) ein H10m- bzw. Hm01- (m > 1) Wellenmoderesonator (R2, R7) ist und daß die Blenden (K12, K231, K23c, K67, K78) für die Ankopplung des H10m- bzw. Hm01-Hohlraumresonators (R2, R7) an seine beiden im Hauptkoppelweg direkt benachbarten Hohlraumresonatoren (R1, R3, R6, R8) im Bereich derjenigen Teilwelle(n) des H10m- bzw. Hm01-Wellenmodes plaziert sind, daß die Überkopplung eine solche Phasenlage erhält, daß eine Filtercharakteristik entsteht, die unterhalb und oberhalb des Filter-Transmissionsbereichs mindestens einen Dämpfungspol aufweist.
- Mikrowellenfilter nach Anspruch 1, dadurch gekennzeichnet, daß alle im Hauptkoppelweg liegenden Hohlraumresonatoren außer dem (den) die Phasenlage der Überkopplung bestimmenden Hohlraumresonator(en) (R2) H101-Wellenmoderesonatoren (R1, R3, R4) sind.
- Mikrowellenfilter nach Anspruch 1, dadurch gekennzeichnet, daß alle im Hauptkoppelweg liegenden Hohlraumresonatoren (R5 ... R8) H10m- bzw. Hm01-(m > 1) Wellenmoderesonatoren sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19524263 | 1995-07-04 | ||
DE19524263A DE19524263C1 (de) | 1995-07-04 | 1995-07-04 | Mikrowellenfilter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0752732A1 EP0752732A1 (de) | 1997-01-08 |
EP0752732B1 true EP0752732B1 (de) | 2001-05-30 |
Family
ID=7765934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96106998A Expired - Lifetime EP0752732B1 (de) | 1995-07-04 | 1996-05-03 | Mikrowellenfilter |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0752732B1 (de) |
DE (2) | DE19524263C1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10123318A1 (de) * | 2001-05-14 | 2002-12-05 | Marconi Comm Gmbh | Mikrowellenfilter |
JP2009111633A (ja) * | 2007-10-29 | 2009-05-21 | Shimada Phys & Chem Ind Co Ltd | 有極形帯域通過フィルタ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3621298A1 (de) * | 1986-06-25 | 1988-01-07 | Ant Nachrichtentech | Mikrowellenfilter mit vielfach gekoppelten hohlraumresonatoren |
-
1995
- 1995-07-04 DE DE19524263A patent/DE19524263C1/de not_active Expired - Fee Related
-
1996
- 1996-05-03 EP EP96106998A patent/EP0752732B1/de not_active Expired - Lifetime
- 1996-05-03 DE DE59606982T patent/DE59606982D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0752732A1 (de) | 1997-01-08 |
DE19524263C1 (de) | 1996-10-17 |
DE59606982D1 (de) | 2001-07-05 |
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