EP0649571B1 - Filtre passe-bande a resonateurs couples - Google Patents
Filtre passe-bande a resonateurs couples Download PDFInfo
- Publication number
- EP0649571B1 EP0649571B1 EP94915581A EP94915581A EP0649571B1 EP 0649571 B1 EP0649571 B1 EP 0649571B1 EP 94915581 A EP94915581 A EP 94915581A EP 94915581 A EP94915581 A EP 94915581A EP 0649571 B1 EP0649571 B1 EP 0649571B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- band
- microstrip
- resonators
- pass filter
- cell
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 238000010168 coupling process Methods 0.000 claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 31
- 239000000758 substrate Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 210000003771 C cell Anatomy 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 239000000725 suspension Substances 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
Definitions
- the present invention relates to a filter bandpass with coupled resonators. She finds a application in electronics, especially in realization of band-pass filters whose frequency of work is located in the FM band, or substantially from 70 to 120 MHz.
- the filter of the invention is of the resonator type coupled.
- the French request FR-A-2-626-716 (or the request corresponding European EP-A-0 326 498) describes a filter with coupled resonators which is illustrated on the figure 1.
- this filter includes five resonators C1 to C5 deposited on the same substrate 10.
- Each resonator includes a conductive microstrip line 14 (in copper for example) forming a loop with an opening 16. Connected through this opening there is a capacitor 18 adjustable, or adjusted once for all. The whole line and capacitor forms an LC resonant circuit.
- the length of the microstrip is of the order of ⁇ / 8 if ⁇ is the length wave associated with the resonant frequency of the circuit.
- the substrate 10 is made of dielectric material (by example in epoxy glass, Teflon, ). On the face bottom of this substrate is a conductive layer not shown (in copper for example) forming ground plan.
- the different resonators are coupled together to the others by parallel and adjacent sides.
- the filter is completed by an input microstrip E and an output microstrip S.
- Such filters work in the frequency band ranging appreciably from 950 to 1750 MHz, in particular in signal receiving stations television broadcast by satellite.
- this filter requires circuits input and output adaptation.
- Such a filter causes losses due to coupling between resonators and it's very difficult to simulate, because no software is capable of simulating so many and, for some, also distant. As soon as we change the number of resonators, for example to vary the band busy, the couplings change and you have to start again all the simulation.
- the purpose of the present invention is to remedy these drawbacks. To this end, it proposes a filter with reduced dimensions (practically by a factor of 10 compared to the filter of the document FR-A-2 626 716 already cited) and fall to approximately ⁇ / 100.
- the filter can therefore work at frequencies falling below 500 MHz.
- the filter of the invention has very low losses, of the order of 2dB. Its bandwidth can be adjusted between a narrow band (2%) and a wide band (40%).
- the resonators of a cell are each formed by a line at microstrip playing, at working frequency, essentially the role of an inductor and by a tuning capacitor. It is therefore still a LC type resonator. But, according to a first characteristic of the resonator, the line is not in shape loop with opening. The tuning capacitor is therefore not inserted into an opening but connected at one end of the line and it has a armature to electrical ground.
- the line includes a part (or branch) straight line used to couple the two resonators of the same cell and, to do this, the two rectilinear branches specific to the two resonators are juxtaposed.
- the length of these branches, as well that their width makes it easy to adjust the coupling to the appropriate value.
- the invention therefore already covers a cell elementary of the type described. But it also covers the if the filter includes several cells elementary, connected directly to each other others consecutively, access specific to the second resonator of a cell being connected to the clean access to the first resonator in the next cell.
- the losses due to cascading are thus reduced to their minimum compared to the filter of the FREQUENZ document already mentioned where the cascading of resonators was done by coupling.
- a total number of equal resonators, the filter of the invention has lower losses and its simulation is found greatly simplified.
- the filter of the invention can comprise several cells like this, in which case two cells are connected directly to one the other, the proper access to the second resonator of a cell being connected to its own access to the first resonator of the next cell.
- the rest of the line at microstrip that is to say the second branch, can have any shape and layout: inclined, at right angles, etc.
- the microstrip line can therefore have various shapes in L, ⁇ , etc ...
- widths of the microstrip branches are not necessarily identical. They may be different from each other. They can even vary gradually, or by jumps, along of the same branch.
- All known or future techniques allowing to make microstrips are applicable to the invention: use of a dielectric substrate, triple plate technology, suspension in a box, existence of a ground plane under a substrate or use metal walls of a housing to constitute ground, etc.
- the use of a dielectric at high permittivity makes it possible to reduce the dimensions. But, if these become too weak, the use of air as a dielectric allows find reasonable dimensions.
- each microstrip includes a first part (or branch) rectilinear L1 (respectively L2) and a second part (or branch) L'1 (L'2) which, in the illustrated variant, forms, with the part L1 (L2), a ⁇ .
- the end e1 (e2) of the branch L1 (L2) is connected to the ground plane 22 by a 24/1 conductor pad and passage (24/2).
- the end e'1 (e'2) of the branch L'1 (L'2) is connected to one of the plates of a capacitor C1 (C2), the other capacitor armature being connected to the ground plane 22 by a stud and a conductive passage 26/1 (26/2).
- a single conductive pad and a single conductive passage can be used to bring together the ends e1, e2 to the ground plane.
- the lines are therefore well short-circuited at one of their ends.
- the cell entry E takes place between C1 and L'1 and the exit S between C2 and L'2.
- the device is symmetrical and we can enter S and exit at E.
- FIGS 3, 4, 5 and 6 illustrate some modes of the various branches of the microstrip.
- the branches L1 (L2) and L'1 (L'2) are an extension of the other and the microstrip is straight. There is more to strictly speaking of the second part, the first can be considered as forming the entire ribbon.
- the branches L'1 (L'2) not serving not at coupling are tilted by a certain angle ( ⁇ ) on the branches L1 (L2) used for coupling.
- Branches L'1, L'2 thus form, between them, an angle double (2 ⁇ ).
- ⁇ 45 °, at which the branches L'1, L'2 are at right angles.
- the coupling branch L1 sees its width increase from one end (in this case the one that is grounded) to the other, the reverse also being possible.
- FIGS 7 and 8 illustrate an embodiment particular of a filter according to the invention in the case where this filter comprises two cells.
- Figure 7 first shows the mask used to constitute the printed circuit on the face top of the substrate. This mask is shown at scale 3 which allows to appreciate the dimensions of the inventive filter.
- This mask includes two parts symmetrical about a point O. Each part includes an ME entry access strip and MS outlet, and two juxtaposed T-bands forming a set M1,2 (M3,4) which will correspond to the two cells.
- Figure 8 shows the corresponding electrical diagram in FIG. 7, once the capacitors C1, C2, C3, C4 have been reported.
- the coupled branches are respectively L1, L2 for the first cell and L3, L4 for the second.
- connection ribbon is referenced 30. There is therefore no longer coupling, as in the prior art, but a simple serialization.
- the two cells are arranged so that they are as far apart as possible each other to avoid any coupling between they.
- the second C3-4 cell is not arranged following on from the first C1-2, but placed symmetrically to the element 30.
- the filter included more than two cells, it would always be so, with alternating cells sometimes oriented in one direction sometimes in the other to form a cascade of staggered cells.
- FIGs 9 to 12 illustrate the performance of the filter in Figures 7 and 8.
- Figure 9 shows the attenuation of the filter in the band from 78 to 118 MHz. We see that the attenuation at the center of the bandwidth is very low (around 2 dB).
- Figure 10 gives the same attenuation but on a wider frequency range from 1 MHz to 200 MHz.
- Figure 11 shows the high attenuation frequencies, up to 2000 MHz. We see a peak appear parasitic but with considerable attenuation of around 70 dB. This peak therefore does not matter in the practice.
- FIG. 12 shows the standing wave rate (TOS) as a function of frequency. In the bandwidth, this rate drops to around -22 dB.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
- un ligne à microruban conducteur jouant, à la fréquence de travail, le rôle d'une inductance, cette ligne comprenant une première partie rectiligne représentant une partie du microruban, cette première partie ayant une extrémité reliée à une masse électrique, les deux premières parties propres à deux résonateurs d'une même cellule étant juxtaposées et assurant le couplage entre les résonateurs, la ligne comprenant encore une seconde partie cette seconde partie présentant une extrémité,
- un condensateur d'accord ayant une armature reliée à l'extrémité de la seconde partie et une autre armature reliée à la masse électrique,
- un accès situé en un point entre l'extrémité de la seconde partie et le condensateur d'accord la seconde partie de chaque microruban faisant un certain angle avec la première partie, les deux secondes parties des microrubans des deux résonateurs faisant entre elles un angle double.
- la figure 1, déjà décrite, montre un filtre selon l'art antérieur à cellules couplées ;
- la figure 2 représente schématiquement un filtre conforme à l'invention avec une seule cellule ;
- la figure 3 illustre un mode de réalisation à microruban entièrement rectiligne ;
- la figure 4 illustre un mode de réalisation à microruban à branches inclinées ;
- la figure 5 illustre un mode de réalisation à microruban à branche de couplage de largeur variable ;
- la figure 6 illustre un mode de réalisation à microruban à seconde branche de largeur variable ;
- la figure 7 montre un masque pour la réalisation d'un filtre à deux cellules ;
- la figure 8 est un schéma électrique d'un filtre à deux cellules ;
- la figure 9 montre la bande passante obtenue avec le filtre de la figure 8, dans une plage allant de 78 à 118 MHz ;
- la figure 10 montre l'atténuation du filtre en fonction de la fréquence, dans une plage allant de 1 à 200 MHz ;
- la figure 11 montre l'atténuation vers les hautes fréquences jusqu'à 2000 MHz ;
- la figure 12 montre le taux d'ondes stationnaires dans une plage de fréquence allant de 1 à 200 MHz.
Claims (9)
- Filtre passe-bande à résonateurs couplés, caractérisé par le fait qu'il comprend au moins une cellule élémentaire de filtrage, chaque cellule élémentaire étant formée de résonateurs au nombre exclusif de deux, ci-après désignés par premier et second résonateur, chaque résonateur d'une cellule comprenant :une ligne à microruban conducteur (MR1, MR2) jouant, à la fréquence de travail, le rôle d'une inductance, cette ligne comprenant une première partie rectiligne (L1, L2) représentant une partie du microruban, cette première partie (L1, L2) ayant une extrémité (e1, e2) reliée à une masse électrique (22), les deux premières parties (L1, L2) propres au premier et au second résonateurs (R1, R2) d'une même cellule (C) étant juxtaposées et assurant le couplage entre le premier et le second résonateurs (R1, R2), la ligne comprennent encore une seconde partie (L'1, L'2), cette seconde partie présentant une extrémité (e'1, e'2),un condensateur d'accord (C1, C2) ayant une armature reliée à l'extrémité (e'1, e'2) de la seconde partie et une autre armature reliée à la masse électrique (22),un accès (E, S) en un point situé entre l'extrémité (e'1, e'2) de la seconde partie et le condensateur d'accord (C1, C2), la seconde partie (L'1, L'2) de chaque microruban faisant certain angle () avec la première partie (L1, L2), les deux secondes parties (L'1, L'2) des microrubans des deux résonateurs faisant entre elles un angle double (2).
- Filtre passe-bande selon la revendication 1, caractérisé par le fait qu'il comprend plusieurs cellules élémentaires de filtrage connectées directement les unes aux autres de manière consécutive, l'accès propre au second résonateur d'une cellule étant connecté à l'accès propre au premier résonateur de la cellule qui suit.
- Filtre passe-bande selon la revendication 1, caractérisé par le fait que l'angle () que fait la seconde partage (L'1, L'2) par rapport à la première (L1, L2) est égal à 90°, chaque microruban ayant une forme en L.
- Filtre passe-bande selon la revendication 1, caractérisé par le fait que le microruban présente une forme en Γ.
- Filtre passe-bande selon la revendication 1, caractérisé par le fait que la première partie (L1, L2) du microruban a une largeur variable.
- Filtre passe-bande selon la revendication 1, caractérisé par le fait que la seconde partie (L'1, L'2) du micrcruban a une largeur variable.
- Filtre passe-bande selon l'une quelconque des revendications 1 à 5, caractérisé par le fait que les extrémités (e1, e2) des premières parties (L1, L2) des deux microrubans propres à deux résonateurs couplés (R1, R2) sont reliées à une seule et unique masse électrique (24/1, 24/2).
- Filtre passe-bande selon la revendication 1, caractérisé par le fait que les cellules successives (C1-2, C3-4) sont montées en quinconce.
- Filtre passe-bande selon l'une quelconque des revendications 1 à 8, caractérisé par le fait qu'il fonctionne dans une bande de fréquence centrée au voisinage de 100 MHz.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9305287A FR2704983B1 (fr) | 1993-05-04 | 1993-05-04 | Filtre passe-bande a lignes couplees court-circuitees. |
| FR9305287 | 1993-05-04 | ||
| PCT/FR1994/000511 WO1994025996A1 (fr) | 1993-05-04 | 1994-05-03 | Filtre passe-bande a resonateurs couples |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0649571A1 EP0649571A1 (fr) | 1995-04-26 |
| EP0649571B1 true EP0649571B1 (fr) | 1999-09-29 |
Family
ID=9446719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94915581A Expired - Lifetime EP0649571B1 (fr) | 1993-05-04 | 1994-05-03 | Filtre passe-bande a resonateurs couples |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0649571B1 (fr) |
| DE (1) | DE69420924T2 (fr) |
| FI (1) | FI115332B (fr) |
| FR (1) | FR2704983B1 (fr) |
| WO (1) | WO1994025996A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10202475B4 (de) * | 2002-01-23 | 2010-11-18 | Rohde & Schwarz Gmbh & Co. Kg | Abstimmbares Filterelement und abstimmbares Bandpaßfilter |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0164410B1 (ko) * | 1995-07-21 | 1999-03-20 | 김광호 | 스위칭 기능을 갖는 스트립라인 필터 |
| FR2737640B1 (fr) * | 1995-08-03 | 1997-08-29 | Telediffusion Fse | Dispositif de protection de circuits contre l'effet capot |
| US6215374B1 (en) * | 1998-03-16 | 2001-04-10 | Broadband Innovations, Inc. | Magnetically coupled resonators for achieving low cost narrow band pass filters having high selectivity, low insertion loss and improved out-of-band rejection |
| KR20010093794A (ko) * | 1999-09-29 | 2001-10-29 | 추후기재 | 높은 선택도, 낮은 삽입 손실 및 확장된 주파수 범위에대해 개량된 대역외 저지를 갖는 협대역 통과 동조 공진기필터 토폴로지 |
| CN101894995B (zh) * | 2010-05-19 | 2013-07-24 | 华南理工大学 | 一种具有恒定绝对带宽的射频电调带通滤波器 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4074214A (en) * | 1976-09-20 | 1978-02-14 | Motorola, Inc. | Microwave filter |
| US4371853A (en) * | 1979-10-30 | 1983-02-01 | Matsushita Electric Industrial Company, Limited | Strip-line resonator and a band pass filter having the same |
| FR2626716B1 (fr) * | 1988-01-29 | 1990-04-20 | France Etat | Filtre a resonateurs plans |
-
1993
- 1993-05-04 FR FR9305287A patent/FR2704983B1/fr not_active Expired - Fee Related
-
1994
- 1994-05-03 DE DE69420924T patent/DE69420924T2/de not_active Expired - Fee Related
- 1994-05-03 WO PCT/FR1994/000511 patent/WO1994025996A1/fr not_active Ceased
- 1994-05-03 EP EP94915581A patent/EP0649571B1/fr not_active Expired - Lifetime
-
1995
- 1995-01-03 FI FI950033A patent/FI115332B/fi active IP Right Grant
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10202475B4 (de) * | 2002-01-23 | 2010-11-18 | Rohde & Schwarz Gmbh & Co. Kg | Abstimmbares Filterelement und abstimmbares Bandpaßfilter |
Also Published As
| Publication number | Publication date |
|---|---|
| FI950033L (fi) | 1995-01-23 |
| FR2704983A1 (fr) | 1994-11-10 |
| FI115332B (fi) | 2005-04-15 |
| DE69420924T2 (de) | 2000-05-04 |
| FR2704983B1 (fr) | 1995-06-09 |
| FI950033A0 (fi) | 1995-01-03 |
| DE69420924D1 (de) | 1999-11-04 |
| WO1994025996A1 (fr) | 1994-11-10 |
| EP0649571A1 (fr) | 1995-04-26 |
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