EP0367347A1 - UHF bandpass filter - Google Patents
UHF bandpass filter Download PDFInfo
- Publication number
- EP0367347A1 EP0367347A1 EP89202737A EP89202737A EP0367347A1 EP 0367347 A1 EP0367347 A1 EP 0367347A1 EP 89202737 A EP89202737 A EP 89202737A EP 89202737 A EP89202737 A EP 89202737A EP 0367347 A1 EP0367347 A1 EP 0367347A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printed circuit
- filter according
- filter
- resonator
- 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.)
- Granted
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
Definitions
- the present invention relates to a UHF bandpass filter, comprising at least two resonators each located in a cavity.
- Such filters are well known and used in particular for filtering the various television channels in cable networks.
- the object of the present invention is to eliminate this drawback.
- a bandpass filter is particularly remarkable in that the coupling between input or output and resonator, and between resonators between them is carried out by means of lines drawn on a printed circuit crossing the partitions of the cavities, said lines being arranged in such a way that the transmission of energy between said lines and said resonators takes place exclusively by radiation.
- a filter is also remarkable in that the said cavities are formed by the assembly of two molded half-shells, one of which comprises elements of form such that they each constitute the inductive part of each resonator, the associated capacitor being mounted in sandwich between said inductive element and the bottom of the other half-shell.
- each resonator with a variable capacitor for adjusting the central frequency of the filter, in this case it is advantageous that said inductive elements have a tubular shape and that the adjustable core of each variable capacitor is housed in the hollow of said corresponding tubular element, so that said adjustable core is accessible for adjustment through the tube.
- said coupling printed circuit consists of a semi-rigid material, it is sandwiched in slots made in each half-shell, and said slots are slightly offset to mechanically wedge said printed circuit and jointly ensure ground contacts between the printed circuit and said shells.
- the filter has no welds which reduces manufacturing costs and further guarantees the reproducibility of the quality.
- the UHF band has 45 channels numbered from 21 to 65 for which selectivity standards are imposed (1/300 ⁇ F / F ⁇ 1/30); to obtain this selectivity over the entire band, it is advantageous, all other things being equal, to provide several etchings of the printed circuit, a given etch making it possible to obtain the desired coupling rate for a series of several adjacent channels.
- variable attenuator is mounted on the printed circuit to be able to modify the attenuation of the transmission.
- This attenuator is soldered to the printed circuit but it is located in an additional cavity so that the selectivity of the filter is not affected.
- FIG. 1 represents the lower half-shell (DCI) of the filter of generally elongated rectangular shape comprising four interior walls P1, P2, P3, P4 which delimit five cavities; the extreme cavities include inductive elements S1, S2, S3, S4 which are here tubular, hollow and rough foundry for example in zamac but this is not an obligation: similar shapes would be suitable, as well as a metallized plastic molding surface.
- the interior walls are provided with notches to accommodate the printed circuit (CI) comprising the coupling lines.
- the filter housing also has an upper half-shell (DCS) and the assembly is shown in cross section in Figure 2a; the housing (DCS, DCI) is cut in line with one of the inductive elements (SI) opposite which is a housing (LI); the elements LI and SI are arranged to, during assembly, hold in place a variable capacitor (VOC with dotted line in the figure) whose adjustable core (NA) is engaged in the hollow of the inductive element and thus accessible with a screwdriver according the arrow (TV); to compensate for manufacturing gaps and ensure good electrical contact, an elastic metal washer (RE), for example of the ONDUFLEX type, is provided.
- DCS half-shell
- the upper half-shell obviously has four walls facing the walls P1, P2, P3, P4; they are also indented to create a passage (OP) on the printed circuit; in FIG. 2b the passage (OP) is shown enlarged to show that the notches are slightly offset so that the printed circuit (CI) is clearly deformed and wedged by the half-shells during assembly; thus an electrical contact can be obtained for example at points A and B between the housings and copper lines present at the right of the walls; to fix ideas, the outside diameter of the inductive element is 6 mm and its height is 50 mm, each half-shell is 35 mm high or 70 mm for the filter whose width is 20 mm and the length 90 mm; the central cavity is provided to house the generally used attenuator and, in this case, soldered on the printed circuit.
- Each inductive element (SI) with its associated capacitor (VOC) form an adjustable oscillating circuit; due to the fact that the HF currents propagate by skin effect, that is to say in the case present on the external surface of each inductive element, the momentary introduction of the adjustment screwdriver (TV) inside the tube does not modify not the operation of the oscillating circuit.
- FIG. 3 An example of engraving is shown in Figure 3; the copper lines are represented there either as a line or a hatched area.
- Each circuit has of course the same external dimension, for example 25 ⁇ 90, it is made of semi-rigid material to elastically support the above deformation, only the designs of copper are different from one engraving to another.
- the inductive element S1 with its associated VOC capacitor, has been shown in dotted lines.
- the input signal to be filtered arrives at point EN and, via line L10, it excites the inductive element S1 which reacts with its VOC capacity and in turn excites line L11; energy transmission here takes place exclusively by radiation; the signal collected by L11 is transmitted galvanically by the conductor G1, which crosses the wall P1, to the line L20; the inductive element S2 is excited by the signal present in L20 and, in turn, it excites the line L21; the energy transmission between S2 and L21 is here also exclusively by radiation; the signal is then transmitted by the conductor G2, which crosses the wall P2, to an attenuator connected between the terminals A1 and A2; the signal is then transmitted by the conductor G3, etc ... for, after passing through the walls P3, P4 and by the inductive elements S3 and S4, stand out on the output terminal SO where the filtered signal is available.
Abstract
Description
La présente invention a pour objet un filtre passe-bande UHF, comportant au moins deux résonateurs situés chacun dans une cavité.The present invention relates to a UHF bandpass filter, comprising at least two resonators each located in a cavity.
De tels filtres sont bien connus et utilisés notamment pour filtrer les divers canaux de télévision dans les réseaux cablés.Such filters are well known and used in particular for filtering the various television channels in cable networks.
L'inconvénient majeur des filtres UHF classiques est que l'adaptation du couplage entre résonateurs s'effectue manuellement au moyen de fils conducteurs dont le bon positionnement est extrêmement délicat à trouver pour obtenir la largeur de bande et la sélectivité voulue autour de la fréquence centrale de chaque canal.The major drawback of conventional UHF filters is that the adaptation of the coupling between resonators is carried out manually by means of conductive wires, the correct positioning of which is extremely difficult to find in order to obtain the bandwidth and the selectivity desired around the central frequency. of each channel.
La présente invention a pour but de supprimer cet inconvénient.The object of the present invention is to eliminate this drawback.
Selon la présente invention un filtre passe-bande est particulièrement remarquable en ce que le couplage entre entrée ou sortie et résonateur, et entre résonateurs entre eux est réalisé au moyen de lignes dessinées sur un circuit imprimé traversant les cloisons des cavités, les dites lignes étant agencées de telle sorte que la transmission d'énergie entre les dites lignes et les dits résonateurs s'effectue exclusivement par rayonnement.According to the present invention a bandpass filter is particularly remarkable in that the coupling between input or output and resonator, and between resonators between them is carried out by means of lines drawn on a printed circuit crossing the partitions of the cavities, said lines being arranged in such a way that the transmission of energy between said lines and said resonators takes place exclusively by radiation.
Ainsi, du fait que les lignes dessinées sur un circuit imprimé sont fixes, les couplages obtenus en fabrication ont une excellente reproductibilité et la fabrication s'affranchit des réglages manuels dès lors que les lignes du circuit ont été pré-dessinées, et donc optimisées, au bureau d'études.Thus, because the lines drawn on a printed circuit are fixed, the couplings obtained in manufacturing have excellent reproducibility and the manufacturing is freed from manual adjustments as soon as the lines of the circuit have been pre-drawn, and therefore optimized, at the design office.
Dans un mode préféré de réalisation, un filtre est aussi remarquable en ce que les dites cavités sont formées par l'assemblage de deux demi-coquilles moulées dont l'une comporte des éléments de forme telle qu'ils constituent chacun la partie selfique de chaque résonateur, le condensateur associé étant monté en sandwich entre le dit élément selfique et le fond de l'autre demi-coquille.In a preferred embodiment, a filter is also remarkable in that the said cavities are formed by the assembly of two molded half-shells, one of which comprises elements of form such that they each constitute the inductive part of each resonator, the associated capacitor being mounted in sandwich between said inductive element and the bottom of the other half-shell.
Ainsi grâce à l'utilisation de la technique du moulage, tous les éléments du filtre sont assurés d'une excellente reproductibilité en fabrication; de plus l'élément selfique est réalisé économiquement.Thus thanks to the use of the molding technique, all the elements of the filter are assured of excellent reproducibility in manufacturing; more the selfic element is realized economically.
Il est connu de pourvoir chaque résonateur d'un condensateur variable pour le réglage de la fréquence centrale du filtre, dans ce cas il est avantageux que les dits éléments selfiques aient une forme tubulaire et que le noyau ajustable de chaque condensateur variable soit logé dans le creux du dit élément tubulaire correspondant, de telle sorte que le dit noyau ajustable est accessible pour le réglage à travers le tube.It is known to provide each resonator with a variable capacitor for adjusting the central frequency of the filter, in this case it is advantageous that said inductive elements have a tubular shape and that the adjustable core of each variable capacitor is housed in the hollow of said corresponding tubular element, so that said adjustable core is accessible for adjustment through the tube.
On sait que les ondes UHF se propagent en surface de telle sorte que l'introduction momentanée d'un tournevis dans le creux de l'élément selfique ne modifie pas le fonctionnement du résonateur.It is known that UHF waves propagate on the surface so that the momentary introduction of a screwdriver into the hollow of the inductive element does not modify the operation of the resonator.
Pour assurer un bon contact électrique de l'ensemble, il est avantageux de monter une rondelle métallique élastique entre les éléments des résonateurs; celle-ci compense ainsi les éventuelles variations de fabrication des deux demi-coquilles et assure dans tous les cas une bonne pression de contact.To ensure good electrical contact of the assembly, it is advantageous to mount an elastic metal washer between the elements of the resonators; this thus compensates for any manufacturing variations in the two half-shells and in all cases ensures good contact pressure.
Dans un mode de réalisation préféré, le dit circuit imprimé de couplage est constitué d'un matériau semi-rigide, il est positionné en sandwich dans des fentes ménagées dans chaque demi-coquille, et les dites fentes sont légèrement décalées pour coincer mécaniquement le dit circuit imprimé et conjointement assurer des contacts de masse entre le circuit imprimé et les dites coquilles.In a preferred embodiment, said coupling printed circuit consists of a semi-rigid material, it is sandwiched in slots made in each half-shell, and said slots are slightly offset to mechanically wedge said printed circuit and jointly ensure ground contacts between the printed circuit and said shells.
Ainsi le filtre ne présente aucune soudure ce qui réduit les coûts de fabrication et garantit encore davantage la reproductibilité de la qualité.Thus the filter has no welds which reduces manufacturing costs and further guarantees the reproducibility of the quality.
En télévision, la bande UHF comporte 45 canaux numérotés de 21 à 65 pour lesquels des normes de sélectivité sont imposées (1/300<ΔF/F<1/30); pour obtenir cette sélectivité sur toute la bande, il est avantageux, toutes choses égales par ailleurs, de prévoir plusieurs gravures du circuit imprimé, une gravure donnée permettant d'obtenir le taux de couplage recherché pour une série de plusieurs canaux adjacents.In television, the UHF band has 45 channels numbered from 21 to 65 for which selectivity standards are imposed (1/300 <ΔF / F <1/30); to obtain this selectivity over the entire band, it is advantageous, all other things being equal, to provide several etchings of the printed circuit, a given etch making it possible to obtain the desired coupling rate for a series of several adjacent channels.
Dans la télédistribution, il est important de fournir des signaux de niveaux homogènes, dans ce but un atténuateur variable est monté sur le circuit imprimé pour pouvoir modifier l'atténuation de la transmission.In cable distribution, it is important to provide signals of homogeneous levels, for this purpose a variable attenuator is mounted on the printed circuit to be able to modify the attenuation of the transmission.
Cet atténuateur est soudé sur le circuit imprimé mais il est situé dans une cavité supplémentaire de sorte que la sélectivité du filtre n'est pas affectée.This attenuator is soldered to the printed circuit but it is located in an additional cavity so that the selectivity of the filter is not affected.
La présente invention sera mieux comprise à l'aide d'un exemple, non limitatif, de réalisation illustrée par les dessins suivants :
- Figure 1: Vue cavalière écorchée d'une demi-coquille.
- Figure 2 : Vue en coupe du filtre avec détail.
- Figure 3 : Vue d'un circuit imprimé.
- Figure 1: Cavalier view of a half-shell.
- Figure 2: Sectional view of the filter with detail.
- Figure 3: View of a printed circuit.
La figure 1 représente la demi-coquille inférieure (DCI) du filtre de forme générale rectangulaire allongée comportant quatre parois intérieures P1, P2, P3, P4 qui délimitent cinq cavités; les cavités extrêmes comportent des éléments selfiques S1, S2, S3, S4 lesquels sont ici tubulaires, creux et bruts de fonderie par exemple en zamac mais ceci n'est pas une obligation : des formes similaires conviendraient, de même qu'un moulage plastique métallisé en surface. Les parois intérieures sont pourvues d'échancrures pour y loger le circuit imprimé (CI) comportant les lignes de couplage.FIG. 1 represents the lower half-shell (DCI) of the filter of generally elongated rectangular shape comprising four interior walls P1, P2, P3, P4 which delimit five cavities; the extreme cavities include inductive elements S1, S2, S3, S4 which are here tubular, hollow and rough foundry for example in zamac but this is not an obligation: similar shapes would be suitable, as well as a metallized plastic molding surface. The interior walls are provided with notches to accommodate the printed circuit (CI) comprising the coupling lines.
Le boîtier du filtre comporte aussi une demi-coquille supérieure (DCS) et l'ensemble est représenté en coupe transversale sur la figure 2a; la coupe du boîtier (DCS, DCI) est effectuée au droit d'un des éléments selfiques (SI) en vis à vis duquel se trouve un logement (LI); les éléments LI et SI sont agencés pour, lors du montage, maintenir en place un condensateur variable (COV en pointillé sur la figure) dont le noyau réglable (NA) est engagé dans le creux de l'élément selfique et ainsi accessible avec un tournevis selon la flèche (TV); pour compenser les jeux de fabrication et assurer un bon contact électrique, une rondelle métallique élastique (RE), par exemple du genre ONDUFLEX, est prévue. La demicoquille supérieure comporte évidemment quatre parois en vis à vis des parois P1, P2, P3, P4; elles sont aussi échancrées pour aménager un passage (OP) au circuit imprimé; sur la figure 2b le passage (OP) est représenté agrandi pour montrer que les échancrures sont légèrement décalées de sorte que le circuit imprimé (CI) est clairement déformé et coincé par les demi-coquilles lors du montage; ainsi un contact électrique peut être obtenu par exemple aux points A et B entre les boîtiers et des lignes de cuivre présentes au droit des parois; pour fixer les idées, le diamètre extérieur de l'élément selfique est de 6 mm et sa hauteur est de 50 mm, chaque demi-coquille mesure 35 mm de haut soit 70 mm pour le filtre dont la largeur est de 20 mm et la longueur 90 mm; la cavité centrale est prévue pour y loger l'atténuateur généralement utilisé et, dans le cas présent, soudé sur le circuit imprimé.The filter housing also has an upper half-shell (DCS) and the assembly is shown in cross section in Figure 2a; the housing (DCS, DCI) is cut in line with one of the inductive elements (SI) opposite which is a housing (LI); the elements LI and SI are arranged to, during assembly, hold in place a variable capacitor (VOC with dotted line in the figure) whose adjustable core (NA) is engaged in the hollow of the inductive element and thus accessible with a screwdriver according the arrow (TV); to compensate for manufacturing gaps and ensure good electrical contact, an elastic metal washer (RE), for example of the ONDUFLEX type, is provided. The upper half-shell obviously has four walls facing the walls P1, P2, P3, P4; they are also indented to create a passage (OP) on the printed circuit; in FIG. 2b the passage (OP) is shown enlarged to show that the notches are slightly offset so that the printed circuit (CI) is clearly deformed and wedged by the half-shells during assembly; thus an electrical contact can be obtained for example at points A and B between the housings and copper lines present at the right of the walls; to fix ideas, the outside diameter of the inductive element is 6 mm and its height is 50 mm, each half-shell is 35 mm high or 70 mm for the filter whose width is 20 mm and the
Chaque élément selfique (SI) avec son condensateur (COV) associé forment un circuit oscillant réglable; du fait que les courants HF se propagent par effet de peau, c'est à dire dans le cas présent sur la surface extérieure de chaque élément selfique, l'introduction momentanée du tournevis de réglage (TV) à l'intérieur du tube ne modifie pas le fonctionnement du circuit oscillant.Each inductive element (SI) with its associated capacitor (VOC) form an adjustable oscillating circuit; due to the fact that the HF currents propagate by skin effect, that is to say in the case present on the external surface of each inductive element, the momentary introduction of the adjustment screwdriver (TV) inside the tube does not modify not the operation of the oscillating circuit.
Un exemple de gravure est représenté sur la figure 3; les lignes de cuivre y sont représentées sous forme soit de trait soit de zone hachurée.An example of engraving is shown in Figure 3; the copper lines are represented there either as a line or a hatched area.
Chaque circuit a bien sûr la même dimension extérieure par exemple 25×90, il est constitué en matériau semi-rigide pour supporter élastiquement la déformation susdite, seuls les dessins du cuivre sont différents d'une gravure à l'autre.Each circuit has of course the same external dimension, for example 25 × 90, it is made of semi-rigid material to elastically support the above deformation, only the designs of copper are different from one engraving to another.
Sur la figure 3 les axes de passages des éléments selfiques S1, S2, S3, S4 et des parois P1, P2, P3, P4 ont été indiqués verticalement; horizontalement les axes des contacts possibles A et B avec le boîtier au droit des parois sont aussi indiqués de telle sorte que, sur chaque circuit, une ligne de cuivre est à la masse si elle se trouve à l'intersection des axes A ou B avec les axes P1, P2, P3 et P4; ces points sont visualisés par des croix 'X'.In FIG. 3 the axes of passage of the inductive elements S1, S2, S3, S4 and of the walls P1, P2, P3, P4 have been indicated vertically; horizontally the axes of the possible contacts A and B with the box at the right of the walls are also indicated so that, on each circuit, a copper line is grounded if it is at the intersection of the axes A or B with axes P1, P2, P3 and P4; these points are displayed by crosses 'X'.
Pour bien montrer le positionnement respectif et le dimensionnement des éléments du filtre, l'élément selfique S1, avec son condensateur associé COV, a été représenté en pointillé.To clearly show the respective positioning and dimensioning of the filter elements, the inductive element S1, with its associated VOC capacitor, has been shown in dotted lines.
Le signal d'entrée à filtrer arrive au point EN et, par l'intermédiaire de la ligne L10, il excite l'élément selfique S1 lequel réagit avec sa capacité COV et excite à son tour la ligne L11; la transmission d'énergie s'effectuer ici exclusivement par rayonnement; la signal recueilli par L11 est transmis galvaniquement par le conducteur G1, lequel traverse la paroi P1, à la ligne L20; l'élément selfique S2 est excité par le signal présent dans L20 et, à son tour, il excite la ligne L21; la transmission d'énergie entre S2 et L21 s'effectue ici aussi exclusivement par rayonnement; le signal est alors transmis par le conducteur G2, lequel traverse la paroi P2, jusqu'à un atténuateur connecté entre les bornes A1 et A2; le signal est alors transmis par le conducteur G3, etc... pour, après passage à travers les parois P3, P4 et par les éléments selfiques S3 et S4, ressortir sur la borne de sortie SO où le signal filtré est disponible.The input signal to be filtered arrives at point EN and, via line L10, it excites the inductive element S1 which reacts with its VOC capacity and in turn excites line L11; energy transmission here takes place exclusively by radiation; the signal collected by L11 is transmitted galvanically by the conductor G1, which crosses the wall P1, to the line L20; the inductive element S2 is excited by the signal present in L20 and, in turn, it excites the line L21; the energy transmission between S2 and L21 is here also exclusively by radiation; the signal is then transmitted by the conductor G2, which crosses the wall P2, to an attenuator connected between the terminals A1 and A2; the signal is then transmitted by the conductor G3, etc ... for, after passing through the walls P3, P4 and by the inductive elements S3 and S4, stand out on the output terminal SO where the filtered signal is available.
Il est à remarquer que le point de forte surtension de chaque résonateur, c'est à dire celui où est située la rondelle RE, ne se trouve en contact qu'avec de l'air à l'exclusion de tout diélectrique, ceci est primordial pour conserver le meilleur coefficient de surtension possible.It should be noted that the point of high overvoltage of each resonator, that is to say that where the washer RE is located, is in contact only with air to the exclusion of any dielectric, this is essential to keep the best possible overvoltage coefficient.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8814425 | 1988-11-04 | ||
| FR8814425A FR2638902A1 (en) | 1988-11-04 | 1988-11-04 | UHF BANDPASS FILTER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0367347A1 true EP0367347A1 (en) | 1990-05-09 |
| EP0367347B1 EP0367347B1 (en) | 1994-04-06 |
Family
ID=9371586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89202737A Expired - Lifetime EP0367347B1 (en) | 1988-11-04 | 1989-10-30 | UHF bandpass filter |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4990869A (en) |
| EP (1) | EP0367347B1 (en) |
| JP (1) | JPH02172301A (en) |
| DE (1) | DE68914396T2 (en) |
| FR (1) | FR2638902A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543758A (en) * | 1994-10-07 | 1996-08-06 | Allen Telecom Group, Inc. | Asymmetric dual-band combine filter |
| FI110392B (en) * | 1995-09-26 | 2003-01-15 | Solitra Oy | Coaxial resonator filter, method of producing a coaxial resonator filter, coaxial resonator structure and method of producing a coaxial resonator structure |
| FI110391B (en) * | 1995-11-08 | 2003-01-15 | Solitra Oy | Capsule filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2519524A (en) * | 1947-08-13 | 1950-08-22 | Hazeltine Research Inc | Multiple-tuned wave-selector system |
| US3693115A (en) * | 1970-12-28 | 1972-09-19 | American Electronic Lab | Mechanical tunable bandpass filter |
| US4740765A (en) * | 1985-09-30 | 1988-04-26 | Murata Manufacturing Co., Ltd. | Dielectric filter |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2045560C3 (en) * | 1970-09-15 | 1978-03-09 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Microwave filters made from cuboid cavity resonators |
| JPS5924167Y2 (en) * | 1978-12-28 | 1984-07-18 | アルプス電気株式会社 | Microwave filter |
| US4477785A (en) * | 1981-12-02 | 1984-10-16 | Communications Satellite Corporation | Generalized dielectric resonator filter |
| JPS58114503A (en) * | 1981-12-26 | 1983-07-07 | Fujitsu Ltd | Coupling construction of filter |
| US4621245A (en) * | 1984-05-08 | 1986-11-04 | Zenith Electronics Corporation | Intermediate frequency filter for a DBS receiver |
| JPS625702A (en) * | 1985-07-01 | 1987-01-12 | Fujitsu Ltd | Band-pass filter |
| JPS62243402A (en) * | 1986-04-15 | 1987-10-23 | Murata Mfg Co Ltd | Dielectric filter |
| JPS6324701A (en) * | 1986-07-16 | 1988-02-02 | Murata Mfg Co Ltd | Distrubuted constant line device |
-
1988
- 1988-11-04 FR FR8814425A patent/FR2638902A1/en not_active Withdrawn
-
1989
- 1989-10-30 DE DE68914396T patent/DE68914396T2/en not_active Expired - Fee Related
- 1989-10-30 EP EP89202737A patent/EP0367347B1/en not_active Expired - Lifetime
- 1989-11-01 US US07/430,743 patent/US4990869A/en not_active Expired - Fee Related
- 1989-11-02 JP JP1285114A patent/JPH02172301A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2519524A (en) * | 1947-08-13 | 1950-08-22 | Hazeltine Research Inc | Multiple-tuned wave-selector system |
| US3693115A (en) * | 1970-12-28 | 1972-09-19 | American Electronic Lab | Mechanical tunable bandpass filter |
| US4740765A (en) * | 1985-09-30 | 1988-04-26 | Murata Manufacturing Co., Ltd. | Dielectric filter |
Non-Patent Citations (4)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, vol. 11, no. 171 (E-512)[2618], 2nd juin 1987; & JP-A-62 005 702 (FUJITSU LTD) 12-01-1987 * |
| PATENT ABSTRACTS OF JAPAN, vol. 12, no. 115 (E-599)[2962], 12 avril 1988; & JP-A-62 243 402 (MURATA MFG CO., LTD) 23-10-1987 * |
| PATENT ABSTRACTS OF JAPAN, vol. 12, no. 232 (E-628)[3079], 30 Juin 1988; & JP-A-63 024 701 (MURATA MFG CO., LTD) 02-02-1988 * |
| SIEMENS-BAUTEILE-INFORMATIONEN, vol. 6, no. 6, decembre 1968, pages 200-201, Munich, DE; K. PICHLER et al.: "Vierkreis-UHF-Bandfilter YH AF 1010" * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0367347B1 (en) | 1994-04-06 |
| JPH02172301A (en) | 1990-07-03 |
| FR2638902A1 (en) | 1990-05-11 |
| DE68914396T2 (en) | 1994-11-10 |
| US4990869A (en) | 1991-02-05 |
| DE68914396D1 (en) | 1994-05-11 |
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