EP0021523B1 - Bandstop filter for a microwave transmission line and polarisation circuit for a microwave transistor comprising this filter - Google Patents

Bandstop filter for a microwave transmission line and polarisation circuit for a microwave transistor comprising this filter Download PDF

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Publication number
EP0021523B1
EP0021523B1 EP19800200567 EP80200567A EP0021523B1 EP 0021523 B1 EP0021523 B1 EP 0021523B1 EP 19800200567 EP19800200567 EP 19800200567 EP 80200567 A EP80200567 A EP 80200567A EP 0021523 B1 EP0021523 B1 EP 0021523B1
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EP
European Patent Office
Prior art keywords
filter
frequency
filtering element
transmission
transmission line
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EP19800200567
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German (de)
French (fr)
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EP0021523A1 (en
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François de Ronde
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Laboratoires dElectronique Philips SAS
Koninklijke Philips NV
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Laboratoires dElectronique et de Physique Appliquee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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    • 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
    • H01P1/2039—Galvanic coupling between Input/Output

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  • the present invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, as well as a microwave transistor bias circuit comprising this filter.
  • a conventional way of ensuring the reception of a microwave signal consists in providing in the receiver a mixer which receives on the one hand this useful microwave signal of frequency f s and on the other hand a signal of frequency f OL delivered by an oscillator local and which delivers a signal at an intermediate frequency f FI equal to the difference of the frequencies f s and f OL .
  • a filter must be placed which prevents the transmission of the frequencies f s and f OL while favoring that of the lower frequency f F , i.e. a low-pass filter or all at least tape cutter.
  • the object of the invention is to propose a band-cut microwave filter which avoids such necessarily unsatisfactory compromises and which proves to be extremely compact while presenting a fairly wide cut band and offering a short-circuit plane well located by compared to the mixer to optimize the yield thereof.
  • the invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, with the characteristics according to claim 1.
  • the notch filter thus produced can use an extremely small space very efficiently, and a judicious choice of the dimensions and the relative position of the two filter elements makes it possible to obtain at will the desired width of cut band.
  • the filter may include at least a third filtering element intended to prevent the transmission of a third frequency band centered on the frequency twice the central frequency of the first frequency band and composed of a quarter wave filter of electrical length ⁇ 1/8 placed in parallel on one of the two transmission channels at a distance from the entry point of the notch filter equal to ⁇ 1/2 .
  • the notch filter shown in Figure 1 has an entry point E, to which an upstream part Le of the transmission line is connected, to which the filter is incorporated, and an exit point S, to which a downstream part is connected L s of this transmission line.
  • This notch filter is composed of a first filter element 10 and a second filter element 20, intended to prevent the transmission of a first frequency band and a second frequency band adjacent to the first, respectively. .
  • Element 20 is composed of a quarter-wave filter, of electrical length equal to a quarter of the wavelength X 2 associated with the center frequency of the second frequency band, and placed at the entry point E of the notch filter.
  • the element 10 is composed of a set of two transmission paths 21 and 22 in parallel which separate at the entry point E, in the short-circuit plane defined by the presence of the second filter element 20, surround this element 20 then regroup at the exit point S.
  • La first channel 21 follows in the example here describes a circular arc path of electrical length ⁇ 1/4 (At 1 being the wavelength associated with the center frequency of the first frequency band), while the second channel 22 follows a path in a complementary arc, of electrical length 3 ⁇ 1/4 .
  • the signals at the frequency corresponding to the wavelength ⁇ 1 therefore arrive in phase opposition and no signal at this frequency is transmitted to the part L s of the line of transmission.
  • the contour of the notch filter is obviously extremely compact, since the circular shape adopted for element 10 is very compact and the interior of this first element is used for positioning. of the second filter element. Furthermore, the insulation provided by the notch filter according to the invention is excellent, and limited only by the parasitic coupling (higher modes) which can appear between E and S (an attenuation of 60 dB can for example be obtained if you don't want a bandwidth greater than a few percent).
  • This exemplary embodiment of the invention is an advantageous compact structure in two respects, on the one hand for its use in applications where the small dimensions of the components play a primordial role, and on the other hand in that it allows better focus the electric and magnetic fields and thus make the filter less sensitive to proximity effects.
  • the wavelength X2 is for example that which is associated with the useful microwave signal of frequency f s received and intended for the mixer (for example a microwave diode), and the length of wave ⁇ 1 that associated with the frequency signal f OL supplied by the local oscillator and also sent to the mixer.
  • the downstream part Lg of the transmission line receives only the frequency signal f FI supplied by the non-linear component that constitutes the mixer; the frequency signals f s and f OL do not reach this part L S , thanks to the combined action of the filter elements 10 and 20.
  • this filter comprises, in accordance with FIG. 2, a third filtering element 30, intended to prevent the transmission of a third frequency band centered on the frequency twice the center frequency of the first frequency band.
  • the signal of frequency f OL delivered by the local oscillator has an amplitude in general much higher than that of the received microwave signal, of frequency fs, and the presence of the harmonic of rank 2 of this frequency signal f OL therefore corresponds to a significant loss of energy.
  • the introduction of the third filter element 30 makes it possible to prevent the transmission of this harmonic and to avoid the deterioration of the yield which results from such a transmission.
  • This third filtering element 30 is a quarter-wave filter placed in parallel on the second transmission channel 22, at a distance from the entry point E of the notch filter equal to ⁇ 1/2 and its length is ⁇ 1 / 8 since we want to eliminate the harmonic of rank 2 from the signal filtered by the first filtering element 10.
  • FIG. 3 shows another possible application of the invention, namely the incorporation of the notch filter into the bias circuit of a microwave transistor.
  • the notch filter according to the invention is connected (perpendicularly in the present case), at its entry point E, to a section 40 of transmission line, itself placed in parallel on a transmission line 41 comprising a microwave transistor 42 and a capacitor 45.
  • the length of the section 40 is equal to a quarter of the wavelength associated with the microwave signal crossing the transmission line 41.
  • the filter is also connected perpendicularly, at its output point S, to a power supply circuit 43 of the transistor 42.
  • This arrangement allows the circuit 43 to ensure the bias of the transistor 42 by transmission of its bias voltage across the line section 44, the notch filter (such as that of the FIG. 1 for example), the section 40 and the line 41. Conversely, the microwave signal which traverses the line 41 cannot reach the circuit 43 because of the effective barrier constituted by the notch filter. The filtering action is even more effective if the section 40 is given as high an impedance as possible.
  • the circular arrangement of the two transmission paths of the first filter element has been recognized as being as compact as possible, but a square or rectangle arrangement, for example, remains compact and therefore almost as advantageous as that described and shown.

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Description

La présente invention concerne un filtre coupe-bande pour ligne de transmission hyperfréquence à constantes réparties réalisé en structure planar et notamment suivant la technique du microruban, ainsi qu'un circuit de polarisation de transistor hyperfréquence comprenant ce filtre.The present invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, as well as a microwave transistor bias circuit comprising this filter.

Une façon classique d'assurer la réception d'un signal hyperfréquence consiste à prévoir dans le récepteur un mélangeur qui reçoit d'une part ce signal hyperfréquence utile de fréquence fs et d'autre part un signal de fréquence fOL délivré par un oscillateur local et qui délivre un signal à une fréquence intermédiaire fFI égale à la différence des fréquences fs et fOL. A la suite du mélangeur, il faut cependant placer un filtre qui empêche la transmission des fréquences fs et fOL tout en favorisant celle de la fréquence plus faible fF,, c'est-à-dire un filtre passe-bas ou tout au moins coupe-bande.A conventional way of ensuring the reception of a microwave signal consists in providing in the receiver a mixer which receives on the one hand this useful microwave signal of frequency f s and on the other hand a signal of frequency f OL delivered by an oscillator local and which delivers a signal at an intermediate frequency f FI equal to the difference of the frequencies f s and f OL . Following the mixer, however, a filter must be placed which prevents the transmission of the frequencies f s and f OL while favoring that of the lower frequency f F ,, i.e. a low-pass filter or all at least tape cutter.

De tels filtres apparaissent à l'intérieur de l'étage d'amplification décrit dans « Proceedings of the 4th European Microwave conference», Montreux, septembre 1974, pages 97 à 100 (voir la figure 2), ou de l'étage oscillateur décrit dans « Proceedings of the 5th European Microwave Conference », Hambourg, septembre 1975, page 296 et suivantes (voir la figure 4). Néanmoins, si ce filtre est utilisé isolément comme dans le cas du second document, il n'a qu'une très faible bande coupée et ne peut convenir pour l'application envisagée ci-dessus. Si plusieurs filtres sont au contraire associés, l'accroissement de bande coupée qui peut en résulter est compensé par l'apparition d'autres inconvénients, essentiellement l'encombrement du filtre global ainsi réalisé et l'absence de localisation précise de ce filtre par rapport au mélangeur.Such filters appear inside the amplification stage described in "Proceedings of the 4th European Microwave conference", Montreux, September 1974, pages 97 to 100 (see Figure 2), or in the oscillator stage described in "Proceedings of the 5th European Microwave Conference", Hamburg, September 1975, page 296 et seq. (see Figure 4). However, if this filter is used in isolation as in the case of the second document, it has only a very small cut band and cannot be suitable for the application envisaged above. If several filters are on the contrary associated, the increase in cut band which may result therefrom is compensated by the appearance of other drawbacks, essentially the bulk of the overall filter thus produced and the absence of precise localization of this filter relative to in the blender.

Le but de l'invention est de proposer un filtre hyperfréquence coupe-bande qui évite de tels compromis nécessairement peu satisfaisants et qui s'avère extrêmement compact tout en présentant une bande coupée assez large et en offrant un plan de court-circuit bien localisé par rapport au mélangeur pour optimiser le rendement de celui-ci.The object of the invention is to propose a band-cut microwave filter which avoids such necessarily unsatisfactory compromises and which proves to be extremely compact while presenting a fairly wide cut band and offering a short-circuit plane well located by compared to the mixer to optimize the yield thereof.

L'invention concerne à cet effet un filtre coupe-bande pour ligne de transmission hyperfréquence à constantes réparties réalisé en structure planar et notamment suivant la technique du microruban, avec les caractéristiques selon la revendication 1.To this end, the invention relates to a notch filter for microwave transmission line with distributed constants produced in planar structure and in particular according to the microstrip technique, with the characteristics according to claim 1.

Le filtre coupe-bande ainsi réalisé peut utiliser un espace extrêmement restreint de façon très efficace, et un choix judicieux des dimensions et de la position relative des deux éléments de filtrage permet d'obtenir à volonté la largeur de bande coupée souhaitée.The notch filter thus produced can use an extremely small space very efficiently, and a judicious choice of the dimensions and the relative position of the two filter elements makes it possible to obtain at will the desired width of cut band.

Un filtre de structure apparemment voisine est décrit dans l'article « Design of a stripline filter using high-Q triplate lines paru dans le périodique « Journal of the Asia Electronics Union », Volume 3, n° 3, 1970, pages 38 et 39, mais on constate immédiatement que le deuxième élément de filtrage prévu dans ce filtre, situé d'une part à l'extérieur du premier élément de filtrage ce qui donne au filtre des dimensions deux fois supérieures à celles du filtre selon l'invention, fonctionne en outre à l'intérieur de la bande de fréquence coupée par ce premier élément de filtrage et ne peut donc en aucune manière contribuer à élargir la bande coupée par ce premier élément de filtrage.A filter with an apparently similar structure is described in the article "Design of a stripline filter using high-Q triplate lines published in the periodical" Journal of the Asia Electronics Union ", Volume 3, n ° 3, 1970, pages 38 and 39 , but it is immediately noted that the second filtering element provided in this filter, located on the one hand outside the first filtering element, which gives the filter dimensions twice that of the filter according to the invention, works further inside the frequency band cut by this first filter element and can therefore in no way contribute to widening the band cut by this first filter element.

De plus le raccordement de ces deux éléments de filtrage en un même point, au point d'entrée du filtre, définit de façon unique et précise le plan de court-circuit des signaux dont on veut empêcher la transmission, ce qui rend l'action du filtre pratiquement indépendante de la fréquence dans la bande coupée. Pour élargir encore cette bande coupée, le filtre peut comprendre au moins un troisième élément de filtrage destiné à empêcher la transmission d'une troisième bande de fréquence centrée sur la fréquence double de la fréquence centrale de la première bande de fréquence et composé d'un filtre quart d'onde de longueur électrique λ1/8 placé en parallèle sur l'une des deux voies de transmission à une distance du point d'entrée du filtre coupe-bande égale à λ1/2.In addition, the connection of these two filter elements at the same point, at the filter entry point, uniquely and precisely defines the short-circuit plane of the signals whose transmission is to be prevented, which makes the action of the filter practically independent of the frequency in the cut band. To further widen this cut band, the filter may include at least a third filtering element intended to prevent the transmission of a third frequency band centered on the frequency twice the central frequency of the first frequency band and composed of a quarter wave filter of electrical length λ 1/8 placed in parallel on one of the two transmission channels at a distance from the entry point of the notch filter equal to λ 1/2 .

D'autres particularités et avantages de l'invention seront mieux compris en se référant à la description qui suit et aux dessins annexés qui montrent, à titre d'exemples non limitatifs, quelques réalisations de l'invention et dans lesquels :

  • la figure 1 représente une première réalisation, à deux éléments de filtrage, du filtre coupe-bande selon l'invention ;
  • la figure 2 montre une deuxième réalisation, à trois éléments de filtrage, du filtre coupe-bande selon l'invention ; et
  • la figure 3 illustre l'application de l'invention à la polarisation d'un transistor hyperfréquence.
Other features and advantages of the invention will be better understood by referring to the description which follows and to the appended drawings which show, by way of nonlimiting examples, some embodiments of the invention and in which:
  • FIG. 1 represents a first embodiment, with two filtering elements, of the notch filter according to the invention;
  • FIG. 2 shows a second embodiment, with three filtering elements, of the notch filter according to the invention; and
  • FIG. 3 illustrates the application of the invention to the polarization of a microwave transistor.

Le filtre coupe-bande représenté sur la figure 1 comporte un point d'entrée E, auquel se raccorde une partie amont Le de la ligne de transmission à laquelle est incorporé le filtre, et un point de sortie S, auquel se raccorde une partie aval Ls de cette ligne de transmission. Ce filtre coupe-bande est composé d'un premier élément de filtrage 10 et d'un deuxième élément de filtrage 20, destinés à empêcher la transmission respectivement d'une première bande de fréquence et d'une deuxième bande de fréquence adjacente à la première.The notch filter shown in Figure 1 has an entry point E, to which an upstream part Le of the transmission line is connected, to which the filter is incorporated, and an exit point S, to which a downstream part is connected L s of this transmission line. This notch filter is composed of a first filter element 10 and a second filter element 20, intended to prevent the transmission of a first frequency band and a second frequency band adjacent to the first, respectively. .

L'élément 20 est composé d'un filtre quart d'onde, de longueur électrique égale au quart de la longueur d'onde X2 associée à la fréquence centrale de la deuxième bande de fréquence, et placé au point d'entrée E du filtre coupe-bande. L'élément 10 est composé d'un ensemble de deux voies de transmission 21 et 22 en parallèle qui se séparent au point d'entrée E, dans le plan de court-circuit défini par la présence du deuxième élément de filtrage 20, entourent cet élément 20 puis se regroupent au point de sortie S. La première voie 21 suit dans l'exemple ici décrit un trajet en arc de cercle de longueur électrique λ1/4 (À1 étant la longueur d'onde associée à la fréquence centrale de la première bande de fréquence), tandis que la deuxième voie 22 suit un trajet en arc de cercle complémentaire, de longueur électrique 3 λ1/4. Au point S où se réunissent les voies 21 et 22, les signaux à la fréquence correspondant à la longueur d'onde À1 arrivent donc en opposition de phase et aucun signal à cette fréquence n'est transmis à la partie Ls de la ligne de transmission.Element 20 is composed of a quarter-wave filter, of electrical length equal to a quarter of the wavelength X 2 associated with the center frequency of the second frequency band, and placed at the entry point E of the notch filter. The element 10 is composed of a set of two transmission paths 21 and 22 in parallel which separate at the entry point E, in the short-circuit plane defined by the presence of the second filter element 20, surround this element 20 then regroup at the exit point S. La first channel 21 follows in the example here describes a circular arc path of electrical length λ 1/4 (At 1 being the wavelength associated with the center frequency of the first frequency band), while the second channel 22 follows a path in a complementary arc, of electrical length 3 λ 1/4 . At point S where channels 21 and 22 meet, the signals at the frequency corresponding to the wavelength λ1 therefore arrive in phase opposition and no signal at this frequency is transmitted to the part L s of the line of transmission.

Le contour du filtre coupe-bande est, à l'évidence, extrêmement compact, puisque la forme circulaire adoptée pour l'élément 10 est d'un encombrement très restreint et que l'intérieur de ce premier élément est utilisé pour la mise en place du deuxième élément de filtrage. Par ailleurs, l'isolation assurée par le filtre coupe-bande selon l'invention est excellente, et limitée seulement par le couplage parasite (modes supérieurs) qui peut apparaître entre E et S (une atténuation de 60 dB peut par exemple être obtenue si l'on ne veut pas une bande passante supérieure à quelques pour cent). Cet exemple de réalisation de l'invention est une structure compacte avantageuse à double titre, d'une part pour son utilisation dans les applications où le faible encombrement des composants joue un rôle primordial, et d'autre part en ce qu'elle permet de mieux concentrer les champs électrique et magnétique et de rendre ainsi le filtre moins sensible aux effets de proximité.The contour of the notch filter is obviously extremely compact, since the circular shape adopted for element 10 is very compact and the interior of this first element is used for positioning. of the second filter element. Furthermore, the insulation provided by the notch filter according to the invention is excellent, and limited only by the parasitic coupling (higher modes) which can appear between E and S (an attenuation of 60 dB can for example be obtained if you don't want a bandwidth greater than a few percent). This exemplary embodiment of the invention is an advantageous compact structure in two respects, on the one hand for its use in applications where the small dimensions of the components play a primordial role, and on the other hand in that it allows better focus the electric and magnetic fields and thus make the filter less sensitive to proximity effects.

Dans l'application qui avait été évoquée plus haut, la longueur d'onde X2 est par exemple celle qui est associée au signal hyperfréquence utile de fréquence fs reçu et destiné au mélangeur (par exemple une diode hyperfréquence), et la longueur d'onde λ1 celle qui est associée au signal de fréquence fOL fourni par l'oscillateur local et également envoyée vers le mélangeur. La partie aval Lg de la ligne de transmission ne reçoit que le signal de fréquence fFI fourni par le composant non linéaire que constitue le mélangeur ; les signaux de fréquence fs et fOL n'atteignent pas cette partie LS, grâce à l'action combinée des éléments de filtrage 10 et 20.In the application which was mentioned above, the wavelength X2 is for example that which is associated with the useful microwave signal of frequency f s received and intended for the mixer (for example a microwave diode), and the length of wave λ 1 that associated with the frequency signal f OL supplied by the local oscillator and also sent to the mixer. The downstream part Lg of the transmission line receives only the frequency signal f FI supplied by the non-linear component that constitutes the mixer; the frequency signals f s and f OL do not reach this part L S , thanks to the combined action of the filter elements 10 and 20.

Un accroissement de la bande de fréquence coupée par le filtre selon l'invention peut être obtenu si ce filtre comprend, conformément à la figure 2, un troisième élément de filtrage 30, destiné à empêcher la transmission d'une troisième bande de fréquence centrée sur la fréquence double de la fréquence centrale de la première bande de fréquence. En effet, toujours dans le cas de l'application précédemment envisagée, le signal de fréquence fOL délivré par l'oscillateur local a une amplitude en général bien supérieure à celle du signal hyperfréquence reçu, de fréquence fs, et la présence de l'harmonique de rang 2 de ce signal de fréquence fOL correspond donc à une perte d'énergie notable. L'introduction du troisième élément de filtrage 30 permet d'empêcher la transmission de cette harmonique et d'éviter la détérioration du rendement qui résulte d'une telle transmission.An increase in the frequency band cut by the filter according to the invention can be obtained if this filter comprises, in accordance with FIG. 2, a third filtering element 30, intended to prevent the transmission of a third frequency band centered on the frequency twice the center frequency of the first frequency band. Indeed, still in the case of the application previously considered, the signal of frequency f OL delivered by the local oscillator has an amplitude in general much higher than that of the received microwave signal, of frequency fs, and the presence of the harmonic of rank 2 of this frequency signal f OL therefore corresponds to a significant loss of energy. The introduction of the third filter element 30 makes it possible to prevent the transmission of this harmonic and to avoid the deterioration of the yield which results from such a transmission.

Ce troisième élément de filtrage 30 est un filtre quart d'onde placé en parallèle sur la deuxième voie de transmission 22, à une distance du point d'entrée E du filtre coupe-bande égale à λ1/2 et sa longueur est λ1/8 puisqu'on veut éliminer l'harmonique de rang 2 du signal filtré par le premier élément de filtrage 10.This third filtering element 30 is a quarter-wave filter placed in parallel on the second transmission channel 22, at a distance from the entry point E of the notch filter equal to λ 1/2 and its length is λ 1 / 8 since we want to eliminate the harmonic of rank 2 from the signal filtered by the first filtering element 10.

Par rapport à la figure 2, où le troisième élément de filtrage 30 est raccordé à la voie de transmission 22 sur la partie intérieure de l'anneau, on pourrait proposer une variante de réalisation dans laquelle cet élément 30 serait dirigé vers l'extérieur de l'anneau, mais la disposition vers l'intérieur est la plus avantageuse puisqu'elle conserve au filtre coupe-bande selon l'invention son caractère extrêmement compact, malgré la présence d'un élément de filtrage supplémentaire.Compared to FIG. 2, where the third filter element 30 is connected to the transmission channel 22 on the inner part of the ring, an alternative embodiment could be proposed in which this element 30 would be directed towards the outside of the ring, but the inward arrangement is the most advantageous since it retains the notch filter according to the invention its extremely compact character, despite the presence of an additional filter element.

Dans la description qui précède, on a mentionné l'application essentielle que constitue l'utilisation du filtre selon l'invention dans un récepteur hyperfréquence. La figure 3 montre une autre application possible de l'invention, à savoir l'incorporation du filtre coupe-bande dans le circuit de polarisation d'un transistor hyperfréquence. Le filtre coupe-bande selon l'invention est raccordé (perpendiculairement dans le cas présent), en son point d'entrée E, à un tronçon 40 de ligne de transmission, lui-même placé en parallèle sur une ligne de transmission 41 comprenant un transistor hyperfréquence 42 et un condensateur 45. La longueur du tronçon 40 est égale au quart de la longueur d'onde associée au signal hyperfréquence traversant la ligne de transmission 41. Le filtre est par ailleurs raccordé perpendiculairement, en son point de sortie S, à un circuit d'alimentation 43 du transistor 42. Cette disposition permet au circuit 43 d'assurer la polarisation du transistor 42 par transmission de sa tension de polarisation à travers le tronçon de ligne 44, le filtre coupe-bande (tel que celui de la figure 1 par exemple), le tronçon 40 et la ligne 41. Inversement le signal hyperfréquence qui parcourt la ligne 41 ne peut atteindre le circuit 43 en raison du barrage efficace constitué par le filtre coupe-bande. L'action de filtrage est encore plus efficace si l'on donne au tronçon 40 une impédance aussi élevée que possible.In the foregoing description, the essential application that constitutes the use of the filter according to the invention in a microwave receiver has been mentioned. FIG. 3 shows another possible application of the invention, namely the incorporation of the notch filter into the bias circuit of a microwave transistor. The notch filter according to the invention is connected (perpendicularly in the present case), at its entry point E, to a section 40 of transmission line, itself placed in parallel on a transmission line 41 comprising a microwave transistor 42 and a capacitor 45. The length of the section 40 is equal to a quarter of the wavelength associated with the microwave signal crossing the transmission line 41. The filter is also connected perpendicularly, at its output point S, to a power supply circuit 43 of the transistor 42. This arrangement allows the circuit 43 to ensure the bias of the transistor 42 by transmission of its bias voltage across the line section 44, the notch filter (such as that of the FIG. 1 for example), the section 40 and the line 41. Conversely, the microwave signal which traverses the line 41 cannot reach the circuit 43 because of the effective barrier constituted by the notch filter. The filtering action is even more effective if the section 40 is given as high an impedance as possible.

En particulier, la disposition circulaire des deux voies de transmission du premier élément de filtrage a été reconnue comme la plus compacte possible, mais une disposition en carré ou en rectangle, par exemple, reste compacte et donc presque aussi avantageuse que celle décrite et représentée.In particular, the circular arrangement of the two transmission paths of the first filter element has been recognized as being as compact as possible, but a square or rectangle arrangement, for example, remains compact and therefore almost as advantageous as that described and shown.

Claims (3)

1. A bandstop filter for very high frequency transmission lines having distributed constants and being implemented in a planar structure and more particularly in accordance with the microstrip technique, comprising at least a first filtering element (10) and a second filtering element (20), said first element being intended to prevent the transmission of a first frequency band to whose central frequency a wavelength À1 is associated and formed by a set of two transmission paths (21, 22) arranged in parallel which separate at the input point (E) of the bandstop filter and are recombined at the output point (S) of this bandstop filter in such manner that the electrical length of these two parts are equal to one quarter and three quarters of the wavelength λ1, respectively, and the second filter element (20) being constituted by a quarter-wave filter having an electrical length equal to λ2/4, connected to the input point (E) of the bandstop filter and defining at this point a short-circuiting plane, the value of X2 different from the value of À1 being the value of the wavelength associated with the central frequency of a second frequency band which constitutes the band cut by the second filtering element, characterized in that the second filtering element (20) is located within the first filtering element (10) and in that the second frequency band cut by the second filtering element (20) is adjacent to the band cut by the first filtering element (10), such that the different between the central frequencies is small compared with said central frequencies.
2. A stopband filter as claimed in Claim 1, characterized in that it comprises at least a third filtering element (30) intended to prevent the transmission of a third frequency band which is centred around the frequency of double the centre frequency of the first frequency band and comprised of a quarter wavefilter having an electrical length λ1/8, arranged in parallel on the transmission path (22) at a distance from the input point (E) of the bandstop filter equal to λ1/2.
3. The use of a bandstop filter as claimed in any one of the preceding Claims in a high-frequency transmitter biasing circuit (42), characterized in that transversely connected to the input point (E) of the filter is a section (40) of the transmission line which itself is arranged in parallel on a transmission line (41) connected to the high-frequency transistor and in that transversely connected to the output (S) of the filter there is a power supply circuit (43) for this transistor, the electrical length of the section (40) between the input point (E) of the filter and the transmission line (41) being equal to one quarter of the wavelength associated with the frequency of the high frequency signal flowing through this transmission line.
EP19800200567 1979-06-25 1980-06-17 Bandstop filter for a microwave transmission line and polarisation circuit for a microwave transistor comprising this filter Expired EP0021523B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7916260 1979-06-25
FR7916260A FR2460049A1 (en) 1979-06-25 1979-06-25 BANDWHEEL FILTER FOR A HYPERFREQUENCY TRANSMISSION LINE AND A MICROWAVE TRANSISTOR POLARIZATION CIRCUIT COMPRISING THE FILTER

Publications (2)

Publication Number Publication Date
EP0021523A1 EP0021523A1 (en) 1981-01-07
EP0021523B1 true EP0021523B1 (en) 1986-05-07

Family

ID=9227049

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Application Number Title Priority Date Filing Date
EP19800200567 Expired EP0021523B1 (en) 1979-06-25 1980-06-17 Bandstop filter for a microwave transmission line and polarisation circuit for a microwave transistor comprising this filter

Country Status (7)

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EP (1) EP0021523B1 (en)
JP (1) JPS566501A (en)
AU (1) AU536334B2 (en)
BR (1) BR8003890A (en)
CA (1) CA1159118A (en)
DE (1) DE3071590D1 (en)
FR (1) FR2460049A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510326A1 (en) * 1981-07-24 1983-01-28 Thomson Csf LINEAR RESONATOR PASSER FILTER OPEN TO THEIR TWO ENDS
FR2517491A1 (en) * 1981-11-27 1983-06-03 Labo Electronique Physique COMBINER-MIXER WITH DOUBLE SOURCE TRANSISTOR
EP0731521B1 (en) * 1992-04-30 2002-08-28 Matsushita Electric Industrial Co., Ltd. Strip dual mode ring resonator and band-pass filter composed of the resonators
JP5749133B2 (en) * 2011-10-04 2015-07-15 古河電気工業株式会社 High frequency module
JP7133486B2 (en) * 2019-01-16 2022-09-08 日立Astemo株式会社 signal transmission device, signal transmission system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR72524E (en) * 1951-05-23 1960-04-14 Int Standard Electric Corp Transmission system for high frequency
BE519797A (en) * 1952-05-08
US3150325A (en) * 1962-04-12 1964-09-22 Donald J Blattner Wide band traveling wave parametric amplifier
DE2453605B2 (en) * 1974-11-12 1976-09-09 Siemens AG, 1000 Berlin und 8000 München WAVE GUIDE COUPLER FOR EQUAL DISTRIBUTION OR INTERCONNECTION OF SIGNAL ENERGY
JPS5352336A (en) * 1976-10-22 1978-05-12 Mitsubishi Electric Corp Dividing filter
DE2804118C2 (en) * 1978-01-31 1982-03-04 Siemens AG, 1000 Berlin und 8000 München Microwave ring hybrid circuit in stripline technology
US4185252A (en) * 1978-05-10 1980-01-22 The United States Of America As Represented By The Secretary Of The Army Microstrip open ring resonator oscillators
FR2451110A1 (en) * 1979-03-06 1980-10-03 Labo Electronique Physique MICROWAVE IMAGE FREQUENCY REFLECTION FILTER

Also Published As

Publication number Publication date
AU5951480A (en) 1981-01-08
JPS566501A (en) 1981-01-23
JPS6322481B2 (en) 1988-05-12
FR2460049A1 (en) 1981-01-16
AU536334B2 (en) 1984-05-03
CA1159118A (en) 1983-12-20
EP0021523A1 (en) 1981-01-07
DE3071590D1 (en) 1986-06-12
BR8003890A (en) 1981-01-13
FR2460049B1 (en) 1983-07-08

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