EP1573852A1 - Wide band microwave passband filter - Google Patents
Wide band microwave passband filterInfo
- Publication number
- EP1573852A1 EP1573852A1 EP03795995A EP03795995A EP1573852A1 EP 1573852 A1 EP1573852 A1 EP 1573852A1 EP 03795995 A EP03795995 A EP 03795995A EP 03795995 A EP03795995 A EP 03795995A EP 1573852 A1 EP1573852 A1 EP 1573852A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lines
- section
- axis
- symmetry
- filter
- 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.)
- Ceased
Links
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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
-
- 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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
Definitions
- the present invention relates to a broadband microwave bandpass filter.
- the bandpass filters currently used at microwave frequencies are generally of the type with rectilinear coupled lines or folded in a "U" shape. Such filters have insufficient stiffness of the sides of their frequency / attenuation characteristic and insertion losses.
- the subject of the present invention is a bandpass filter having a frequency / attenuation characteristic whose flanks are as steep as possible and which introduces negligible insertion losses.
- the bandpass filter according to the invention comprises a plurality of folded ⁇ / 2 lines, successively arranged head to tail and coupled together, and it is characterized in that each of these lines has an approximate shape of "V" the two branches of which are symmetrical with respect to an axis of symmetry, each of these branches consisting of a first section parallel to the axis of symmetry, a second section following the first and perpendicular to the axis of symmetry , directed towards the axis of symmetry without reaching it, of a third section following the second, parallel to the axis of symmetry and closer to it than the first section, and of a fourth section following in the third, perpendicular to the axis of symmetry and joining it, and by the fact that these lines are made of superconductive material.
- FIG. 2 is an enlarged view of part of FIG. 1, and
- FIG. 3 is a diagram of characteristic curves of the filter of the invention and filters of the prior art.
- the filter described below has a bandwidth of 2 or 4
- GHz for a central frequency which may be between 3 and 20 GHz approximately, but it is understood that the invention is not limited to these values, and that a person skilled in the art will be able, on reading the present description, modify these values while obtaining the same advantages as in the present example.
- the bandpass filter 1 shown in the drawing comprises, for the present example, twelve lines of electrical length ⁇ 12 coupled together and referenced L1 to L12, but it is understood that the number of lines of a filter may be different , advantageously between 12 and 16.
- the stiffness of the sides of the frequency / attenuation characteristic being a direct function of the number of lines, it may be necessary to seek a compromise between a great stiffness and a large bulk (generally, the devices comprising such filters should include a large number of them to improve their characteristics, while their size must be limited, for example when these devices are airborne).
- Lines L1 and L12 are "folded" lines with a general "V" shape.
- the two branches of this "V" instead of being rectilinear, are each in the form of a "stair step" having, at mid-height, a landing perpendicular to the 'axis of symmetry of the' V 'at each end of which is connected a' post 'parallel to the axis of symmetry of the' V '.
- the successive lines are arranged head to tail, so as to be optimally coupled and to reduce the size of the filter.
- the free end of the line L12 is directly connected to a metallized block E formed on the substrate 2 and constituting the input terminal of the filter 1.
- the free end of the line L1 is directly connected to a metallized block S formed on the substrate 2 and constituting the output terminal of the filter 1.
- a metallized block S formed on the substrate 2 and constituting the output terminal of the filter 1.
- the shapes and dimensions of the terminals E and S are determined so as to give them an adequate impedance.
- the inlet of the filter can be on the side of line L1, and its outlet on the side of line L12.
- the bar 2 has for example a rectangular shape, and the lines L1 to Ln follow one another in a direction 3 parallel to a long side of the bar 2.
- These lines have a general shape of "V” and the axes of symmetry of these " V "are all parallel to a direction 4 which is perpendicular to the direction 3, the openings of the "V” being alternately directed in opposite directions.
- the common “height” of all the lines L1 to Ln is referenced h (dimension of the lines measured parallel to the direction 4). In detail, and as shown in Figure 2 for four successive lines Lm-1.
- Lm, Lm + 1, Lm + 2, these lines are produced as follows, as explained below for the line Lm, identical to all the other lines, only the orientation of the lines alternating from one line to the next .
- the axis of symmetry of the line Lm is referenced 5, and only half of this line is described here (to the left of the axis 5, as seen in FIG. 2), the other half is deducing the symmetry with respect to the axis 5.
- the line Lm comprises a first rectilinear section 6 extending over practically half the height h. This section is parallel to the axis 5. The section 6 is followed by a section 7 which is perpendicular thereto and goes towards the axis 5 without however reaching it.
- the section 7 is extended by a section 8 parallel to the axis 5, which itself extends by a section 9 perpendicular to the axis 5 and arriving up to the axis 5.
- the other half of the line Lm consists of sections 6a to 9a, respectively symmetrical of sections 6 to 9 with respect to axis 5.
- D be the distance between sections 6 and 6a.
- the sum of the lengths of the sections 9 and 9a is substantially equal to D / 3, and it follows that the lengths of the sections 7 and 7a are practically each equal to D / 3.
- the successive lines L1 to Ln are very close to each other, in order to ensure optimum coupling between them.
- the distance d between two adjacent lines is advantageously a few tens of micrometers and preferably less than 100 ⁇ m for filter lines capable of operating at frequencies between 2 and 20 GHz, for example.
Abstract
The invention concerns a filter comprising several μ/2 lines, (L1 ... Ln) arranged in head to tail and tightly coupled together. Said lines are made of supraconductive material and are stepped.
Description
FILTRE PASSE-BANDE HYPERFREQUENCES A LARGE BANDE BROADBAND HYPERFREQUENCY BAND PASS FILTER
La présente invention se rapporte à un filtre passe-bande hyperfiréquences à large bande.The present invention relates to a broadband microwave bandpass filter.
Les filtres passe-bande utilisés actuellement en hyperfréquences sont généralement du type à lignes couplées rectilignes ou repliées en « U ». De tels filtres présentent une raideur insuffisante des flancs de leur caractéristique fréquence/atténuation et des pertes d'insertion.The bandpass filters currently used at microwave frequencies are generally of the type with rectilinear coupled lines or folded in a "U" shape. Such filters have insufficient stiffness of the sides of their frequency / attenuation characteristic and insertion losses.
La présente invention a pour objet un filtre passe-bande présentant une caractéristique fréquence/atténuation dont les flancs soient le plus raides possible et qui introduise des pertes d'insertion négligeables. Le filtre passe-bande conforme à l'invention comporte une pluralité de lignes λ/2 repliées, disposées successivement tête-bêche et couplées entre elles, et il est caractérisé par le fait que chacune de ces lignes a une forme approximative de « V » dont les deux branches sont symétriques par rapport à un axe de symétrie, chacune de ces branches se composant d'un premier tronçon parallèle à l'axe de symétrie, d'un deuxième tronçon faisant suite au premier et perpendiculaire à l'axe de symétrie, dirigé vers l'axe de symétrie sans l'atteindre, d'un troisième tronçon faisant suite au deuxième, parallèle à l'axe de symétrie et plus proche de celui-ci que le premier tronçon, et d'un quatrième tronçon faisant suite au troisième, perpendiculaire à l'axe de symétrie et le rejoignant, et par le fait que ces lignes sont en matériau supraconducteur.The subject of the present invention is a bandpass filter having a frequency / attenuation characteristic whose flanks are as steep as possible and which introduces negligible insertion losses. The bandpass filter according to the invention comprises a plurality of folded λ / 2 lines, successively arranged head to tail and coupled together, and it is characterized in that each of these lines has an approximate shape of "V" the two branches of which are symmetrical with respect to an axis of symmetry, each of these branches consisting of a first section parallel to the axis of symmetry, a second section following the first and perpendicular to the axis of symmetry , directed towards the axis of symmetry without reaching it, of a third section following the second, parallel to the axis of symmetry and closer to it than the first section, and of a fourth section following in the third, perpendicular to the axis of symmetry and joining it, and by the fact that these lines are made of superconductive material.
La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation, pris à titre d'exemple non limitatif et illustré par le dessin annexé, sur lequel : - la figure 1 est une vue en plan d'un filtre passe-bande conforme à l'invention,The present invention will be better understood on reading the detailed description of an embodiment, taken by way of nonlimiting example and illustrated by the appended drawing, in which: - Figure 1 is a plan view of a bandpass filter according to the invention,
- la figure 2 est une vue agrandie d'une partie de la figure 1 , etFIG. 2 is an enlarged view of part of FIG. 1, and
- la figure 3 est un diagramme de courbes caractéristiques du filtre de l'invention et de filtres de l'art antérieur. Le filtre décrit ci-dessous a une bande passante de 2 ou de 4- Figure 3 is a diagram of characteristic curves of the filter of the invention and filters of the prior art. The filter described below has a bandwidth of 2 or 4
GHz, pour une fréquence centrale pouvant être comprise entre 3 et 20 GHz environ, mais il est bien entendu que l'invention n'est pas limitée à ces valeurs, et que l'homme du métier pourra, à la lecture de la présente
description, modifier ces valeurs tout en obtenant les mêmes avantages qu'avec le présent exemple.GHz, for a central frequency which may be between 3 and 20 GHz approximately, but it is understood that the invention is not limited to these values, and that a person skilled in the art will be able, on reading the present description, modify these values while obtaining the same advantages as in the present example.
Le filtre passe-bande 1 représenté sur le dessin comporte, pour le présent exemple, douze lignes de longueur électrique λ 12 couplées entre elles et référencées L1 à L12, mais il est bien entendu que le nombre de lignes d'un filtre peut être différent, avantageusement compris entre 12 et 16. La raideur des flancs de la caractéristique fréquence/atténuation étant une fonction directe du nombre de lignes, on pourra être amené à rechercher un compromis entre une grande raideur et un encombrement important (généralement, les appareils comportant de tels filtres devraient en comporter un grand nombre pour améliorer leurs caractéristiques, alors que leur encombrement doit être limité, par exemple lorsque ces appareils sont aéroportés).The bandpass filter 1 shown in the drawing comprises, for the present example, twelve lines of electrical length λ 12 coupled together and referenced L1 to L12, but it is understood that the number of lines of a filter may be different , advantageously between 12 and 16. The stiffness of the sides of the frequency / attenuation characteristic being a direct function of the number of lines, it may be necessary to seek a compromise between a great stiffness and a large bulk (generally, the devices comprising such filters should include a large number of them to improve their characteristics, while their size must be limited, for example when these devices are airborne).
Les lignes L1 et L12 sont des lignes « repliées » à forme générale en « V ». Cependant, selon une caractéristique importante de l'invention, les deux branches de ce « V », au lieu d'être rectilignes, sont chacune en forme de « marche d'escalier » présentant, à mi-hauteur, un palier perpendiculaire à l'axe de symétrie du « V » à chaque extrémité duquel se raccorde un « montant » parallèle à l'axe de symétrie du « V ». Les lignes successives sont disposées tête-bêche, de façon à être couplées de manière optimale et à réduire l'encombrement du filtre. L'extrémité libre de la ligne L12 est directement reliée à un pavé métallisé E formé sur le substrat 2 et constituant la borne d'entrée du filtre 1. L'extrémité libre de la ligne L1 est directement reliée à un pavé métallisé S formé sur le substrat 2 et constituant la borne de sortie du filtre 1. Bien entendu, les formes et dimensions des bornes E et S sont déterminées de façon à leur conférer une impédance adéquate. II est également bien entendu que l'entrée du filtre peut se faire du côté de la ligne L1, et sa sortie du côté de la ligne L12.Lines L1 and L12 are "folded" lines with a general "V" shape. However, according to an important characteristic of the invention, the two branches of this "V", instead of being rectilinear, are each in the form of a "stair step" having, at mid-height, a landing perpendicular to the 'axis of symmetry of the' V 'at each end of which is connected a' post 'parallel to the axis of symmetry of the' V '. The successive lines are arranged head to tail, so as to be optimally coupled and to reduce the size of the filter. The free end of the line L12 is directly connected to a metallized block E formed on the substrate 2 and constituting the input terminal of the filter 1. The free end of the line L1 is directly connected to a metallized block S formed on the substrate 2 and constituting the output terminal of the filter 1. Of course, the shapes and dimensions of the terminals E and S are determined so as to give them an adequate impedance. It is also understood that the inlet of the filter can be on the side of line L1, and its outlet on the side of line L12.
Les lignes L1 à Ln (n = 12 dans le présent exemple) sont formées par dépôt de couches minces de matériau supraconducteur sur une barrette 2 en matériau présentant de faibles pertes diélectriques, tel que MgO. La barrette 2 a par exemple une forme rectangulaire, et les lignes L1 à Ln se succèdent selon une direction 3 parallèle à un grand côté de la barrette 2. Ces lignes ont une forme générale de « V » et les axes de symétrie de ces « V » sont tous parallèles à une direction 4 qui est perpendiculaire à la
direction 3, les ouvertures des « V » étant alternativement dirigées en sens contraires. La « hauteur » commune de toutes les lignes L1 à Ln est référencée h (dimension des lignes mesurée parallèlement à la direction 4). Dans le détail, et comme représenté en figure 2 pour quatre lignes successives Lm-1. Lm, Lm+1, Lm+2, ces lignes sont réalisées de la façon suivante, comme expliqué ci-après pour la ligne Lm, identique à toutes les autres lignes, seule l'orientation des lignes alternant d'une ligne à la suivante. L'axe de symétrie de la ligne Lm est référencé 5, et on ne décrit ici qu'une moitié de cette ligne (à gauche de l'axe 5, telle que vue sur la figure 2), l'autre moitié s'en déduisant la symétrie par rapport à l'axe 5. La ligne Lm comporte un premier tronçon rectiligne 6 s'étendant sur pratiquement la moitié de la hauteur h. Ce tronçon est parallèle à l'axe 5. Le tronçon 6 est suivi d'un tronçon 7 qui lui est perpendiculaire et se dirige vers l'axe 5 sans toutefois l'atteindre. Le tronçon 7 se prolonge par un tronçon 8 parallèle à l'axe 5, qui se prolonge lui-même par un tronçon 9 perpendiculaire à l'axe 5 et arrivant jusqu'à l'axe 5. L'autre moitié de la ligne Lm se compose des tronçons 6a à 9a, respectivement symétriques des tronçons 6 à 9 par rapport à l'axe 5.Lines L1 to Ln (n = 12 in the present example) are formed by depositing thin layers of superconductive material on a strip 2 of material having low dielectric losses, such as MgO. The bar 2 has for example a rectangular shape, and the lines L1 to Ln follow one another in a direction 3 parallel to a long side of the bar 2. These lines have a general shape of "V" and the axes of symmetry of these " V "are all parallel to a direction 4 which is perpendicular to the direction 3, the openings of the "V" being alternately directed in opposite directions. The common “height” of all the lines L1 to Ln is referenced h (dimension of the lines measured parallel to the direction 4). In detail, and as shown in Figure 2 for four successive lines Lm-1. Lm, Lm + 1, Lm + 2, these lines are produced as follows, as explained below for the line Lm, identical to all the other lines, only the orientation of the lines alternating from one line to the next . The axis of symmetry of the line Lm is referenced 5, and only half of this line is described here (to the left of the axis 5, as seen in FIG. 2), the other half is deducing the symmetry with respect to the axis 5. The line Lm comprises a first rectilinear section 6 extending over practically half the height h. This section is parallel to the axis 5. The section 6 is followed by a section 7 which is perpendicular thereto and goes towards the axis 5 without however reaching it. The section 7 is extended by a section 8 parallel to the axis 5, which itself extends by a section 9 perpendicular to the axis 5 and arriving up to the axis 5. The other half of the line Lm consists of sections 6a to 9a, respectively symmetrical of sections 6 to 9 with respect to axis 5.
Soit D la distance entre les tronçons 6 et 6a. Selon un mode de réalisation préféré, la somme des longueurs des tronçons 9 et 9a est sensiblement égale à D/3, et il en résulte que les longueurs des tronçons 7 et 7a sont pratiquement égales chacune à D/3.Let D be the distance between sections 6 and 6a. According to a preferred embodiment, the sum of the lengths of the sections 9 and 9a is substantially equal to D / 3, and it follows that the lengths of the sections 7 and 7a are practically each equal to D / 3.
Les lignes successives L1 à Ln sont très proches les unes des autres, afin d'assurer entre elles un couplage optimal. Comme indiqué en figure 2, la distance d entre deux lignes adjacentes est avantageusement de quelques dizaines de micromètres et de préférence inférieure à 100 μ m pour des lignes de filtres pouvant fonctionner à des fréquences comprises entre 2 et 20 GHz, par exemple.The successive lines L1 to Ln are very close to each other, in order to ensure optimum coupling between them. As indicated in FIG. 2, the distance d between two adjacent lines is advantageously a few tens of micrometers and preferably less than 100 μm for filter lines capable of operating at frequencies between 2 and 20 GHz, for example.
On a représenté en figure 3, les courbes caractéristiques atténuation/fréquence d'un filtre passe-bande conforme à l'invention avec une distance interlignes d = 80 μm (courbe A), d'un filtre passe-bande conforme à l'invention avec d = 104 μm (courbe B) et d'un filtre passe-bande de l'art antérieur avec lignes en simple « U » alternativement dirigées en sens opposés avec une distance interlignes de 144 μm. On constate d'après ces courbes que, d'une part, les pertes d'insertion du filtre conforme à
l'invention sont bien plus faibles que celles d'un filtre de l'art antérieur (sans matériau supraconducteur), ce qui était prévisible du fait de la nature du matériau des lignes du filtre, et d'autre part, les flancs de la courbe A sont plus raides que ceux de la courbe B, et bien plus raides que ceux de la courbe C.
FIG. 3 shows the characteristic attenuation / frequency curves of a bandpass filter according to the invention with a line spacing d = 80 μm (curve A), of a bandpass filter according to the invention with d = 104 μm (curve B) and a bandpass filter of the prior art with single “U” lines alternately directed in opposite directions with an interline distance of 144 μm. It can be seen from these curves that, on the one hand, the insertion losses of the filter conforming to the invention are much weaker than those of a filter of the prior art (without superconductive material), which was to be expected due to the nature of the material of the lines of the filter, and on the other hand, the sides of the curve A are steeper than those of curve B, and much stiffer than those of curve C.
Claims
1. Filtre passe-bande hyperfréquences à large bande, comportant une pluralité de ligne λ/2 repliées, disposées successivement tête-bêche et couplées entre elles, caractérisé par le fait que chacune de ces lignes (L1 à Ln) a une forme approximative de « V » dont les deux branches sont symétriques par rapport à un axe de symétrie (5), chacune de ces branches se composant d'un premier tronçon (6, 6a) parallèle à l'axe de symétrie, d'un deuxième tronçon (7, 7a) faisant suite au premier et perpendiculaire à l'axe de symétrie, dirigé vers l'axe de symétrie sans l'atteindre, d'un troisième tronçon (8, 8a) faisant suite au deuxième, parallèle à l'axe de symétrie et plus proche de celui-ci que le premier tronçon, et d'un quatrième tronçon (9, 9a) faisant suite au troisième, perpendiculaire à l'axe de symétrie et le rejoignant, et par le fait que ces lignes sont en matériau supraconducteur.1. Broadband microwave bandpass filter, comprising a plurality of folded λ / 2 lines, successively arranged head to tail and coupled together, characterized in that each of these lines (L1 to Ln) has an approximate shape of "V", the two branches of which are symmetrical with respect to an axis of symmetry (5), each of these branches consisting of a first section (6, 6a) parallel to the axis of symmetry, of a second section ( 7, 7a) following the first and perpendicular to the axis of symmetry, directed towards the axis of symmetry without reaching it, of a third section (8, 8a) following the second, parallel to the axis of symmetry and closer to it than the first section, and a fourth section (9, 9a) following the third, perpendicular to the axis of symmetry and joining it, and by the fact that these lines are made of material superconductor.
2. Filtre selon la revendication 1, caractérisé par le fait que dans chaque branche du « V », le premier et le troisième tronçon sont sensiblement égaux entre eux.2. Filter according to claim 1, characterized in that in each branch of the "V", the first and the third section are substantially equal to each other.
3. Filtre selon la revendication 2, caractérisé par le fait que la longueur du deuxième tronçon est sensiblement égale au double de celle du quatrième tronçon.3. Filter according to claim 2, characterized in that the length of the second section is substantially equal to twice that of the fourth section.
4. Filtre selon l'une des revendications précédentes, caractérisé par le fait que la distance (d) entre lignes contiguës est inférieure à environ4. Filter according to one of the preceding claims, characterized in that the distance (d) between contiguous lines is less than approximately
100 μm pour des lignes de filtre fonctionnant à une fréquence centrale comprise entre 3 et 20 GHz environ.100 μm for filter lines operating at a central frequency between 3 and 20 GHz approximately.
5. Filtre selon l'une des revendications précédentes, caractérisé par le fait qu'il comporte 12 à 16 lignes environ. 5. Filter according to one of the preceding claims, characterized in that it comprises 12 to 16 lines approximately.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0214050A FR2847080B1 (en) | 2002-11-08 | 2002-11-08 | BROADBAND MICPERFREQUENCY BANDWIDTH FILTER |
| FR0214050 | 2002-11-08 | ||
| PCT/EP2003/050788 WO2004042862A1 (en) | 2002-11-08 | 2003-11-04 | Wide band microwave passband filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1573852A1 true EP1573852A1 (en) | 2005-09-14 |
Family
ID=32116502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03795995A Ceased EP1573852A1 (en) | 2002-11-08 | 2003-11-04 | Wide band microwave passband filter |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1573852A1 (en) |
| AU (1) | AU2003298270A1 (en) |
| FR (1) | FR2847080B1 (en) |
| WO (1) | WO2004042862A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023111379A1 (en) * | 2021-12-15 | 2023-06-22 | Iqm Finland Oy | Transmission line in a superconducting circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021757A (en) * | 1988-11-28 | 1991-06-04 | Fujitsu Limited | Band pass filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05283907A (en) * | 1992-03-31 | 1993-10-29 | Taiyo Yuden Co Ltd | Strip line type filter |
| JP3569156B2 (en) * | 1999-06-07 | 2004-09-22 | 株式会社東芝 | Filter circuit |
-
2002
- 2002-11-08 FR FR0214050A patent/FR2847080B1/en not_active Expired - Fee Related
-
2003
- 2003-11-04 WO PCT/EP2003/050788 patent/WO2004042862A1/en not_active Application Discontinuation
- 2003-11-04 AU AU2003298270A patent/AU2003298270A1/en not_active Abandoned
- 2003-11-04 EP EP03795995A patent/EP1573852A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021757A (en) * | 1988-11-28 | 1991-06-04 | Fujitsu Limited | Band pass filter |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2004042862A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003298270A1 (en) | 2004-06-07 |
| FR2847080B1 (en) | 2005-01-14 |
| FR2847080A1 (en) | 2004-05-14 |
| WO2004042862A1 (en) | 2004-05-21 |
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