EP1172881A2 - Filtre à micro-ondes - Google Patents

Filtre à micro-ondes Download PDF

Info

Publication number
EP1172881A2
EP1172881A2 EP01305922A EP01305922A EP1172881A2 EP 1172881 A2 EP1172881 A2 EP 1172881A2 EP 01305922 A EP01305922 A EP 01305922A EP 01305922 A EP01305922 A EP 01305922A EP 1172881 A2 EP1172881 A2 EP 1172881A2
Authority
EP
European Patent Office
Prior art keywords
coupling
waveguide
filter according
microwave filter
cavity
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.)
Granted
Application number
EP01305922A
Other languages
German (de)
English (en)
Other versions
EP1172881A3 (fr
EP1172881B1 (fr
Inventor
Uwe Rosenberg
Konstantin Beis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson AB
Original Assignee
Marconi Communications GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Marconi Communications GmbH filed Critical Marconi Communications GmbH
Publication of EP1172881A2 publication Critical patent/EP1172881A2/fr
Publication of EP1172881A3 publication Critical patent/EP1172881A3/fr
Application granted granted Critical
Publication of EP1172881B1 publication Critical patent/EP1172881B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 with a first cavity, with at least a second Cavity, and with a coupling device, at least a shaft type present in the first cavity at least one present in the second cavity Shafts type couples, the coupling device at least comprises a first coupling panel, that of a first wall is assigned, which delimits the first cavity.
  • the impairment can of the remote selection behavior due to disturbing Shaft types that are viable outside the pass band are restricted in an unsatisfactory manner become.
  • the reason for this is in particular that by choosing the aperture shape and position predominantly only the realization of the desired filter function Can be taken into account.
  • This will make it very good Remote selection properties achieved. For example it is also with microwave filters that are only a minor Show number of cavities, possible, values> 80 dB to achieve.
  • the fact that the coupling waveguide through whose geometry determines the coupling waveguide wavelength of (2n + 1) ⁇ / 4 remains an optimal one Enables energy transfer.
  • ⁇ preferably corresponds to the waveguide wavelength the filter center frequency. With such a choice of ⁇ points the pass band of the microwave filter the filter center frequency has relatively symmetrical properties on.
  • first Coupling aperture and the second coupling aperture shaped in this way are that they have parallel first large coupling aperture axes have, and that the coupling waveguide has a cross section with a large coupling waveguide axis, the parallel to the first large coupling aperture axes runs.
  • the Wave types for example H11n
  • the waveguide has a cross section with a large coupling waveguide axis, the parallel to the first large coupling aperture axes runs.
  • the coupling device also has a third coupling aperture, which is assigned to the first wall that the first cavity limited, and a fourth coupling aperture comprises, which is assigned to the second wall, the second cavity limits that the third coupling aperture and the fourth coupling aperture through a further coupling waveguide are connected, and that the further coupling waveguide has a length of approximately (2n + 1) ⁇ / 4.
  • the third coupling aperture and the fourth coupling aperture are shaped such that they have parallel second large coupling aperture axes, and that the further coupling waveguide has a cross section has another large coupling waveguide axis that runs parallel to the second large coupling aperture axes.
  • the orientation of the second large coupling aperture axes and the other large coupling waveguide axis become wave types via their magnetic field components coupled, which are parallel to the second large coupling aperture axes and the other large coupling waveguide axis are oriented.
  • that the large coupling waveguide axis and the other large coupling waveguide axis arranged perpendicular to each other are.
  • two independent ⁇ / 4 couplings only couples one ⁇ / 4 coupling the vertically polarized (H11n) wave types, while the other ⁇ / 4 coupling only the degenerate horizontal polarized (H11n) wave types couples.
  • the first cavity and / or the second cavity can be bounded by the walls of a resonator.
  • first coupling aperture and / or the second coupling panel on one end face a resonator is arranged. This is especially true then when the corresponding adjacent end faces are aligned in parallel.
  • the third coupling aperture and / or the fourth coupling panel on one end face a resonator is arranged.
  • At least one resonator can be a round resonator and / or at least one resonator can be a rectangular one Be a resonator. Furthermore, it is conceivable that at least a resonator is an elliptical resonator.
  • Tuning means are preferably used to tune the coupling factor provided by at least one tuning screw can be formed, preferably at least one tuning means in the coupling waveguide and / or a tuning means in the further coupling waveguide extends.
  • the alignment of the voting means is, especially if there are tuning screws, chosen such that the tuning means are perpendicular to the large coupling waveguide axis and / or the further large coupling waveguide axis extends. If the voting means Tuning screws are formed, the coupling factor in simply by twisting the corresponding one Adjustment screw can be adjusted.
  • Figure 1 shows a side view of a first embodiment of the microwave filter according to the invention.
  • the coupling device includes this Embodiment a first coupling screen 2, the one is assigned to the first end wall, which is the first cavity 1 limited, a second coupling aperture 4 that a second Is assigned to the end wall, which is the second cavity 5 limited, and a coupling waveguide 3, which is shown in the Case formed by a rectangular waveguide is.
  • the coupling waveguide 3 connects the first coupling aperture 2 and the second coupling aperture 4.
  • FIG. 2 shows a sectional view along that in FIG. 1 marked cutting line A-A.
  • FIG. 2 shows that the first coupling screen 2 in this embodiment has a rectangular shape.
  • the one in FIG coupling waveguide indicated by the dashed line also has a rectangular cross section, that means it is a rectangular waveguide, which is arranged symmetrically to the first aperture 2.
  • Tuning means for example in the form of a or several tuning screws, with which the Coupling factor can be adjusted accordingly.
  • FIG 3 is a side sectional view of a second Embodiment of the microwave filter according to the invention.
  • Provide a first cavity 10 and a second cavity 50 represent two physical circular resonators Embodiment according to Figure 3 are two independent ⁇ / 4 couplings intended.
  • the first ⁇ / 4 coupling is through a first coupling panel 20, which is assigned to a first wall that delimits the first cavity 10 is a second coupling panel 40, which is assigned to a second wall that delimits the second cavity 50 and one Coupling waveguide 30 formed.
  • the coupling waveguide 30 connects the first coupling panel 20 and the second coupling panel 40.
  • the second ⁇ / 4 coupling is by a third coupling screen 70, which is assigned to the first wall that bounds the first cavity is a fourth coupling aperture 90 associated with the second wall, the delimits the second cavity 50 and another Coupling waveguide 80 formed.
  • the coupling waveguide 80 connects the third coupling aperture 70 to the fourth Coupling aperture 90.
  • this is not shown in Figure 3 is, the length of the coupling waveguide 30 and the length of the coupling waveguide 80 approximately (2n + 1) ⁇ / 4, where ⁇ is again the waveguide wavelength the filter frequency, preferably the filter center frequency equivalent.
  • Figure 4 shows a sectional view of the second embodiment along the microwave filter according to the invention the section line B-B drawn in Figure 3.
  • FIGS. 3 and 4 The mutual position of FIGS. 3 and 4 to recognize.
  • the coupling waveguide 30 and the other Coupling waveguides 80 are in the in FIGS. 3 and 4 illustrated embodiment by rectangular waveguide formed, as this is particularly based on the dashed Lines can be seen in Figure 4.
  • the Coupling waveguide 30 in the form of a rectangular waveguide has a first large waveguide axis that is parallel to the first large coupling aperture axes.
  • the third coupling aperture 70 and the fourth coupling aperture 90 has a rectangular shape, so that they have parallel second large coupling aperture axes.
  • the further coupling waveguide 80 in the form of a rectangular waveguide has another large coupling waveguide axis on, parallel to the second large coupling aperture axes runs.
  • the one shown in FIGS. 3 and 4 Embodiment run the large coupling waveguide axis and the other large coupling waveguide axis perpendicular to each other.
  • Parasitic couplings of other types of waves, for example resonance wave types (for example E01n shaft types) used for the filter function are, as well as disturbing wave types that are outside the Passband are also in this embodiment suppressed, unless they are corresponding (parallel magnetic) field components in the area of a Have coupling screen. Therefore, even in this embodiment with two independent ⁇ / 4 couplings one very good remote selection can be achieved.
  • tuning screws 60, 100 are voting tools in the form of two tuning screws 60, 100 provided.
  • the tuning screw 60 extends adjustable in the coupling waveguide 30, namely vertically to its large coupling waveguide axis. More like that A tuning screw 100 extends into the mold further coupling waveguide 80, also perpendicular to major axis of this further coupling waveguide 80.
  • one or more of the coupling plates 2, 4; 20, 40 have any contour, for example rectangular with rounded corners, elliptical, round, and so on.
  • rectangular waveguides with rounded Corners or elliptical waveguides are conceivable.
  • the cross-sectional dimensions are used to achieve selection properties this coupling waveguide preferably chosen in such a way that only the fundamental type can be propagated is while the cutoff frequency of the next higher orthogonally polarized wave type is much higher than the center frequency of the filter pass band.
  • the present invention is not on the face coupled circular resonators limited, but it are also embodiments with side coupling conceivable.
  • microwave filters with rectangular, elliptical and other resonator designs possible.
  • One or more of the resonators can be used entirely or partially with dielectric or ferromagnetic Materials.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
EP01305922A 2000-07-11 2001-07-10 Filtre à micro-ondes Expired - Lifetime EP1172881B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10033683 2000-07-11
DE10033683A DE10033683A1 (de) 2000-07-11 2000-07-11 Mikrowellenfilter

Publications (3)

Publication Number Publication Date
EP1172881A2 true EP1172881A2 (fr) 2002-01-16
EP1172881A3 EP1172881A3 (fr) 2002-08-07
EP1172881B1 EP1172881B1 (fr) 2008-10-15

Family

ID=7648556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01305922A Expired - Lifetime EP1172881B1 (fr) 2000-07-11 2001-07-10 Filtre à micro-ondes

Country Status (4)

Country Link
EP (1) EP1172881B1 (fr)
AT (1) ATE411628T1 (fr)
DE (2) DE10033683A1 (fr)
NO (1) NO20013430L (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters
US5268659A (en) * 1991-04-29 1993-12-07 University Of Maryland Coupling for dual-mode resonators and waveguide filter
FR2749107A1 (fr) * 1996-05-22 1997-11-28 Europ Agence Spatiale Filtre bimode a guide d'ondes circulaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters
US5268659A (en) * 1991-04-29 1993-12-07 University Of Maryland Coupling for dual-mode resonators and waveguide filter
FR2749107A1 (fr) * 1996-05-22 1997-11-28 Europ Agence Spatiale Filtre bimode a guide d'ondes circulaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HSIN-CHIN CHANG ET AL: "EVANESCENT-MODE COUPLING OF DUAL-MODE RECTANGULAR WAVEGUIDE FILTERS" IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE INC. NEW YORK, US, Bd. 39, Nr. 8, 1. August 1991 (1991-08-01), Seiten 1307-1312, XP000209428 ISSN: 0018-9480 *

Also Published As

Publication number Publication date
EP1172881A3 (fr) 2002-08-07
DE10033683A1 (de) 2002-02-07
ATE411628T1 (de) 2008-10-15
DE50114413D1 (de) 2008-11-27
EP1172881B1 (fr) 2008-10-15
NO20013430D0 (no) 2001-07-10
NO20013430L (no) 2002-01-14

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