EP0594503B1 - Filtre agile passe-bande hyperfréquences à cavités bi-modes - Google Patents
Filtre agile passe-bande hyperfréquences à cavités bi-modes Download PDFInfo
- Publication number
- EP0594503B1 EP0594503B1 EP93402575A EP93402575A EP0594503B1 EP 0594503 B1 EP0594503 B1 EP 0594503B1 EP 93402575 A EP93402575 A EP 93402575A EP 93402575 A EP93402575 A EP 93402575A EP 0594503 B1 EP0594503 B1 EP 0594503B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavities
- filter
- cavity
- bandpass filter
- mode
- 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
Links
- 230000009977 dual effect Effects 0.000 title 1
- 210000000554 iris Anatomy 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 230000005684 electric field Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 240000008042 Zea mays Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000021183 entrée Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Images
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
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
Definitions
- the present invention relates to a bandpass filter microwave, this filter being an agile filter and comprising dual-mode cavities with parallel coupling, i.e. by iris and screw, as opposed to filters online structures.
- Figures 1 and 2 attached are respectively a view in perspective and a schematic cross section of a agile 4-pole filter with two dual-mode cavities, art known, of the TE11n type.
- This filter therefore has two resonant cavities cylindrical 1, 2 which are identical and with parallel axes.
- the internal volume of these cavities is adjustable thanks to movable pistons 3, 4 which make it possible to adjust the resonant frequency of each cavity, and therefore to move the filter tuning frequency, i.e. to allow frequency agility desired for the latter.
- the cavity filter input is powered by a waveguide rectangular 5 which is coupled to the cavity 1 by an iris of coupling 6.
- Cavity 1 then resonates in TE11n mode by example, and provides the orientation of the field vector electric E1.
- a coupling screw 7 at 45 degrees allows to generate, by disturbance of this cavity 1, another mode of the same frequency but electric field vector E2 orthogonal to first.
- a tuning screw 8 allows precise adjustment the volume of cavity 1, so as to compensate for especially the small disturbance due to the coupling screw 7 and the input iris 6.
- cavity 1 resonates well on both TE11n modes hence its name of "dual-mode cavity”.
- Cavity 1 is coupled to the other cavity 2 by an iris 19.
- the latter allows, by coupling the field magnetic, to resonate this cavity 2 on the same frequency than that of cavity 1, and according to a T11n mode of electric field E3.
- a 45 degree coupling screw 9 allows to generate, in this cavity 2, a second mode of electric field E4 orthogonal to electric field E3, this last mode E4 being, by magnetic coupling, coupled to output waveguide 10 by a coupling iris 11.
- a screw 18 is provided as before.
- the present invention aims to remedy these drawbacks.
- these accesses are made respectively by input and output irises, provided on an interchangeable plate, which allows, using a set of plates and therefore a set of input / output irises, shift the center frequency even more widely filtered.
- this bandpass filter agile microwave differs from that according to Figures 1 and 2 by the fact that its entry and exit are no longer provided respectively on the side of the inlet cavity 1 and outlet cavity 2 but are produced by respective coupling irises 12 and 13 which are drilled accordingly in the bottom plate 14 of the filter, this plate being common to cavities 1 and 2. In in other words, entry and exit access are carried out respectively by the bottom of the cavity inlet 1 and through the bottom of the outlet cavity 2.
- the bottom plate 14, being screwed, is easily interchangeable, and a set of plates 14 is provided comprising irises 12, 13 of different sizes of a plate to another, which allows to shift the frequency central of this agile filter much more widely than the allows simple movement of the adjustment pistons 3 and 4.
- the Applicant has produced a filter agile bandpass according to Figure 3 showing, with iris 12, 13 of determined size, frequency agility of 150 MHz and a symmetrical frequency response.
- this same filter could show agility covering a total band of 650 MHz.
- Figure 4 shows a coaxial / guide transition and guide / coaxial, presenting nothing good in itself particular, and which can be advantageously screwed onto the plate 14 to enter and exit on coaxial cables.
- the filter entry is made on a coaxial plug input 16, while output is on a plug output coaxial 17.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Aerials With Secondary Devices (AREA)
Description
- les filtres agiles à cavités mono-mode ont pour inconvénients de nécessiter un encombrement important, d'être d'un coût de réalisation élevé, et de posséder un temps de réglage assez long, en rapport avec le nombre de cavités;
- les filtres agiles à cavités bi-modes, pour lesquels sont générés, dans chaque cavité, deux modes orthogonaux couplés, et qui sont une amélioration, du point de vue coût et temps de réglage, des précédents.
- leur commande simplifiée, du fait de l'obtention de la double résonance par cavité, entraíne une grande simplification mécanique;
- la course mécanique totale des pistons de réglage 3, 4 est relativement élevée (de l'ordre de 10 mm environ), et permet une bonne précision de calage lors de l'agilité en fréquence.
- les figures 1 et 2 sont respectivement une vue en perspective et une vue en coupe transversale d'un filtre agile à cavités bi-modes de l'art connu ;
- la figure 3 est une vue en perspective semblable à la figure 1 et montrant une cavité bi-modes conforme à l'invention ;
- la figure 4 montre en vue perspective agrandie, une transition coaxial/guide et guide/coaxial qui peut être adaptée sur le fond entrée/sortie du filtre selon la figure 3 ;
- la figure 5 est une vue de dessus et en coupe transversale, semblable à la vue selon la figure 2, mais relative au filtre selon la figure 3.
Claims (2)
- Filtre passe-bande agile hyperfréquences ayant un accès d'entrée (12) et un accès de sortie (13) et une pluralité de cavités bi-modes cylindriques (1, 2) à couplage parallèle de volume réglable et dont les axes d'extension sont parallèles et distincts, chacune desdites cavités (1, 2) ayant un fond (14) perpendiculaire à son axe d'extension et une desdites cavités (1) étant couplée à une autre (2) par un iris (19),
caractérisé en ce que ledit accès d'entrée (12) est situé dans ledit fond (14) d'une desdites cavités (1) et en ce que ledit accès de sortie (13) est situé dans ledit fond (14) d'une autre desdites cavités (2), de manière à conférer audit filtre une réponse en fréquences symétrique. - Filtre selon la revendication 1, caractérisé en ce que lesdits accès d'entrée (12) et de sortie (13) sont constitués par des iris réalisés dans une plaque de fond (14) interchangeable, de manière à permettre, à l'aide d'un jeu de plaques de fond (14), de déplacer plus largement la fréquence centrale dudit filtre.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9212650 | 1992-10-22 | ||
| FR9212650A FR2697373B1 (fr) | 1992-10-22 | 1992-10-22 | Filtre agile passe-bande hyperfréquences à cavités bi-modes. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0594503A1 EP0594503A1 (fr) | 1994-04-27 |
| EP0594503B1 true EP0594503B1 (fr) | 1998-03-04 |
Family
ID=9434784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93402575A Expired - Lifetime EP0594503B1 (fr) | 1992-10-22 | 1993-10-20 | Filtre agile passe-bande hyperfréquences à cavités bi-modes |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5381118A (fr) |
| EP (1) | EP0594503B1 (fr) |
| CA (1) | CA2108996A1 (fr) |
| DE (1) | DE69317203T2 (fr) |
| ES (1) | ES2115037T3 (fr) |
| FR (1) | FR2697373B1 (fr) |
| IL (1) | IL107339A (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH325320A (fr) * | 1952-04-01 | 1957-10-31 | Standard Telephone & Radio Sa | Installation de transmission d'ondes ultra-courtes |
| US3070873A (en) * | 1956-11-01 | 1963-01-01 | Applied Radiation Corp | Waveguide construction |
| US3936775A (en) * | 1974-09-30 | 1976-02-03 | Harvard Industries, Inc. | Multicavity dual mode filter |
| US4396896A (en) * | 1977-12-30 | 1983-08-02 | Communications Satellite Corporation | Multiple coupled cavity waveguide bandpass filters |
| US4630009A (en) * | 1984-01-24 | 1986-12-16 | Com Dev Ltd. | Cascade waveguide triple-mode filters useable as a group delay equalizer |
| EP0249612B1 (fr) * | 1985-12-24 | 1991-10-16 | Hughes Aircraft Company | Filtre directionnel de microondes avec reponse quasi-elliptique |
-
1992
- 1992-10-22 FR FR9212650A patent/FR2697373B1/fr not_active Expired - Fee Related
-
1993
- 1993-10-20 EP EP93402575A patent/EP0594503B1/fr not_active Expired - Lifetime
- 1993-10-20 IL IL107339A patent/IL107339A/xx not_active IP Right Cessation
- 1993-10-20 ES ES93402575T patent/ES2115037T3/es not_active Expired - Lifetime
- 1993-10-20 DE DE69317203T patent/DE69317203T2/de not_active Expired - Fee Related
- 1993-10-22 CA CA002108996A patent/CA2108996A1/fr not_active Abandoned
- 1993-10-22 US US08/139,836 patent/US5381118A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0594503A1 (fr) | 1994-04-27 |
| ES2115037T3 (es) | 1998-06-16 |
| FR2697373A1 (fr) | 1994-04-29 |
| US5381118A (en) | 1995-01-10 |
| DE69317203T2 (de) | 1998-07-16 |
| IL107339A0 (en) | 1994-07-31 |
| DE69317203D1 (de) | 1998-04-09 |
| CA2108996A1 (fr) | 1994-04-23 |
| IL107339A (en) | 1997-03-18 |
| FR2697373B1 (fr) | 1994-12-09 |
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