EP0044758A1 - Terminating arrangement for a microwave transmission line with minimal V.S.W.R. - Google Patents

Terminating arrangement for a microwave transmission line with minimal V.S.W.R. Download PDF

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Publication number
EP0044758A1
EP0044758A1 EP81400958A EP81400958A EP0044758A1 EP 0044758 A1 EP0044758 A1 EP 0044758A1 EP 81400958 A EP81400958 A EP 81400958A EP 81400958 A EP81400958 A EP 81400958A EP 0044758 A1 EP0044758 A1 EP 0044758A1
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Prior art keywords
resistive layer
ground
conductor
layer
resistive
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EP81400958A
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German (de)
French (fr)
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EP0044758B1 (en
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Sylviane Bitoune
Pierre Dufond
François Herrbach
Maurice Lecreff
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Thales SA
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Thomson CSF SA
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/24Terminating devices
    • H01P1/26Dissipative terminations
    • H01P1/268Strip line terminations

Definitions

  • the invention relates to a transmission line termination device in which it is sought to minimize the standing wave rate originating from the reflection of microwaves on a resistive load placed at the end of the line.
  • Such resistive loads are frequently produced, of value equal to the modulus of the characteristic impedance of the transmission line, in the form of a deposit etched on an insulator, in particular a layer of nickel and chromium alloy deposited. -on an insulating ceramic.
  • the first condition is easy to achieve, in the case of charges deposited by etching using a conventional adjustment process which can be erosion by sandblasting or attack by laser beam.
  • the second condition is more difficult to achieve because we observe capacitive or inductive effects from the non-negligible surface and irregularities of the nickel-chromium layer.
  • This surface cannot be reduced either in width, in length or in two dimensions without observing certain drawbacks.
  • a thinner layer of nickel-chromium therefore more resistive and therefore of smaller surface cannot withstand certain heat dissipation, which limits the power withstand of the device;
  • a layer of normal thickness but for example, narrower and longer, to present the same surface would give a discontinuity, and therefore an energy reflection, producing undesirable standing waves, at the transition point between the conductor of the microstrip line and the resistive layer.
  • the invention aims to remedy these drawbacks by seeking to correct the impedance of the resistive load, either by modifying its shape, or by adding a capacitance thereto, or finally by combining the two aforementioned means.
  • the device according to the invention comprises a conductor constituted by a metal strip deposited on an insulating substrate and at least one ground electrode, the metal strip being connected at its end to a resistive layer itself connected to ground, the device being of the type in which the resistive layer is of decreasing width between its points of connection to the metal strip and to ground, or in which the inherent inductance of the resistive layer is compensated, in the operating frequency range, by at least a conductive deposit capacitively coupled with this ground electrode and electrically connected to this resistive layer.
  • the resistive layer is interrupted by a transverse conductive strip located closer to the conductor than to the ground connection point, two conductive deposits being formed on the substrate on either side of the long sides of the trapezoid and interconnected by the conductive strip.
  • a microstrip line element comprises a dielectric substrate 1, for example made of pure alumina, in the form of an elongated and flat parallelepiped having two large faces: one of these faces is entirely metallized and constitutes the ground plane 2. The other is metallized only over part of its width and constitutes a strip 3 which is none other than the upper conductor of the microstrip line.
  • This strip is produced for example by depositing successive layers of chromium, copper and gold. It is connected along a transverse straight line 11 to a layer 4 of resistive alloy constituting a termination charge. This layer 4 is itself connected along a transverse straight line 12 to a metallization 5 connected to the ground plane by a connection of negligible ohmic resistance.
  • the connection to the ground plane can be carried out either by etching the end face 6 of the substrate, or by welding a flexible metal strip, not shown, or even by a metallized hole (not shown) between the metallizations 5 and 2 .
  • Layer 4 is constituted for example by a deposit of nickel and chromium alloy, carried out by evaporation under vacuum and reaching a few hundred angstroms. It is known to obtain a layer resistance of 25 ohms per square by this method. To obtain a resistance of 50 ohms between lines 11 and 12, a deposit twice as long as wide is then carried out, that is to say in the case of an alumina substrate 0.4 mm thick, with a strip 3 of 0.35 mm in width giving substantially a microstrip line of 50 ohms, a layer 4 of 0.7 mm in length.
  • the deposit of nickel and chromium alloy can advantageously be carried out over a longer length than is necessary so that the useful length can then be easily adjusted by depositing a layer of gold on the parts. to short-circuit, by protecting, during the gilding operation, the useful part of the load using a resin layer obtained by photomasking.
  • the standing wave rate observed for a frequency of 18 GHz, is greater than 3. This is due in particular to the fact that at such frequency, the wavelength in the propagation medium (l alumina of the substrate) is 6.5 mm, length before which that of a resistive layer of 0.7 mm is by no means negligible. The resistance therefore does not act as a localized constant, which partly explains the importance of the standing wave rate observed.
  • layer 4 is given the shape of a trapezoid, the large base of which is the connection line 11 and the small base MN is connected to the metallization 5 over a length as small as possible while obtaining a good ground return contact, ie approximately 0.03 mm.
  • the resistance R (ohms) of the load is given by the formula: in which R denotes the resistance per square (in ohms) of the resistive layer 4, h is the height of the trapezoid formed by this layer, and "ln" means that we take the natural logarithm of the ratio a / b.
  • a transverse conductive strip 30 is inserted, leading to two metallizations 31 and 32, which constitute the armatures of capacitors whose other armature is the ground plane.
  • the two metallizations measure 100 microns in width by 300 microns in length and are connected together by a band 30 of width equal to one hundred microns, distant about 200 microns from line 11.
  • the standing wave rate observed is for example 1.6 to 18 GHz.
  • a standing wave rate of 1.3 is observed for a frequency of 18 GHz.
  • the decrease in width is all the smaller for the strip 4 as one moves away from the line 11 separating the strip 3 from the resistive load.
  • the invention also applies to lines of the "stripline" type where two ground planes are separated from a single central strip by two dielectric substrates.
  • the strip can be etched on one of the substrates according to the same characteristics as those found in Figures 2 to 3.
  • FIG. 6 an end of such a line, comprising, on a substrate 1, visible only between the metallizations, a conductive strip 3 deposited by etching entered two lateral strips 61 and 62 deposited by etching between two lateral bands 61 and 62 deposited at the same time as the band 3 and connected together by a deposit 60 of the same kind, constituting a mass return.
  • a resistive layer 4 of trapezoidal shape is deposited so as to be connected to the strip 3 on the one hand and to the deposit 60 on the other hand.
  • Capacities 63 and 64 consist of insulating deposits on the strips 63 and 64, deposits then covered with a conductive layer connected to the layer 4 by connections 65 and 66, connected to layer 4 by two small pads 67 and 68 constituted by deposit of gold.
  • capacitors 63 and 64 It is also possible to use bare pads of ceramic capacitors to form the capacitors 63 and 64.

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Abstract

Dans ce dispositif de terminaison de ligne de transmission on cherche à rendre minimal le taux d'ondes stationnaires provenant de la réflexion des microondes sur une charge résistive placée en bout de ligne. A cet effet, notamment pour une ligne du type microbande comportant un substrat (1) diélectrique dont la face inférieure est métallisée (plan de masse), un conducteur (3), disposé sur la face supérieure dudit substrat, est prolonge par une couché résistive (4) de forme trapézoïdale dont l'extrémité etroite est raccordée à une métallisation (5) reliée à la masse. En outre, pour compenser l'inductance de la charge, deux capacités, formées par des dépôts métalliques (31, 32) déposés sur le substrat, sont reliées à la couche (4). Applications aux transmissions à large bande de fréquence entre 1 et 20 GHz.In this transmission line termination device, it is sought to minimize the standing wave rate originating from the reflection of the microwaves on a resistive load placed at the end of the line. To this end, in particular for a line of the microstrip type comprising a dielectric substrate (1) whose lower face is metallized (ground plane), a conductor (3), disposed on the upper face of said substrate, is extended by a resistive coating. (4) trapezoidal in shape, the narrow end of which is connected to a metallization (5) connected to ground. In addition, to compensate for the inductance of the load, two capacitors, formed by metallic deposits (31, 32) deposited on the substrate, are connected to the layer (4). Applications to broadband transmissions between 1 and 20 GHz.

Description

L'invention concerne un dispositif de terminaison de ligne de transmission dans lequel on cherche à rendre minimal le taux d'ondes stationnaires provenant de la réflexion des micro-ondes sur une charge résistive placée en bout de ligne.The invention relates to a transmission line termination device in which it is sought to minimize the standing wave rate originating from the reflection of microwaves on a resistive load placed at the end of the line.

On réalise fréquemment de telles charges résistives, de valeur égale au module de l'impédance caractéristique de la ligne de transmission, sous la forme d'un dépôt gravé sur un isolant, notamment d'une couche d'alliage de nickel et de chrome déposée-sur une céramique isolante.Such resistive loads are frequently produced, of value equal to the modulus of the characteristic impedance of the transmission line, in the form of a deposit etched on an insulator, in particular a layer of nickel and chromium alloy deposited. -on an insulating ceramic.

Cette technique est particulièrement intéressante dans le cas des lignes du type "microbande" (de l'anglais "microstrip") par exemple dans la fabrication des coupleurs directifs dans lesquels il existe une voie dite "découplée" où toute l'énergie hyperfréquence doit être absorbée, et cela même dans des bandes de fréquences s'élevant jusqu'à 20 GHz.This technique is particularly advantageous in the case of lines of the "microstrip" type (for example "microstrip"), for example in the manufacture of directional couplers in which there is a so-called "decoupled" channel where all the microwave energy must be absorbed, even in frequency bands up to 20 GHz.

Elle est applicable également aux lignes d'un type analogue à deux plans de masse (en anglais "stripline") et aux lignes coplanaires.It is also applicable to lines of a type analogous to two ground planes (in English "stripline") and to coplanar lines.

Dans tous les cas la charge absorbante doit répondre à deux exigences :

  • 1°/ avoir une impédance dont la partie réelle est égale à l'impédance caractéristique de la ligne ;
  • 2°/ avoir une partie imaginaire aussi voisine que possible de zéro.
In all cases, the absorbent filler must meet two requirements:
  • 1 ° / have an impedance the real part of which is equal to the characteristic line impedance;
  • 2 ° / have an imaginary part as close as possible to zero.

La première condition est facile à réaliser, dans le cas des charges déposées par gravure en utilisant un procédé classique d'ajustage qui peut être l'érosion au jet de sable ou l'attaque par rayon laser.The first condition is easy to achieve, in the case of charges deposited by etching using a conventional adjustment process which can be erosion by sandblasting or attack by laser beam.

La deuxième condition est plus difficile à réaliser car on observe des effets capacitifs ou inductifs provenant de la surface non négligeable et des irrégularités de la couche de nickel-chrome. On ne peut diminuer cette surface soit en largeur, soit en longueur, soit dans les deux dimensions sans observer certains inconvénients. D'une part, en effet, une couche plus mince de nickel-chrome, donc plus résistive et donc de moindre surface ne peut supporter certaines dissipations thermiques, ce qui limite la tenue puissance du dispositif ; d'autre part, une couche d'épaisseur normale mais par exemple, plus étroite et plus longue, pour présenter la même surface, donnerait une discontinuité, et donc une réflexion d'énergie, produisant des ondes stationnaires indésirables, au point de transition entre le conducteur de la ligne microbande et la couche résistive.The second condition is more difficult to achieve because we observe capacitive or inductive effects from the non-negligible surface and irregularities of the nickel-chromium layer. This surface cannot be reduced either in width, in length or in two dimensions without observing certain drawbacks. On the one hand, in fact, a thinner layer of nickel-chromium, therefore more resistive and therefore of smaller surface cannot withstand certain heat dissipation, which limits the power withstand of the device; on the other hand, a layer of normal thickness but for example, narrower and longer, to present the same surface, would give a discontinuity, and therefore an energy reflection, producing undesirable standing waves, at the transition point between the conductor of the microstrip line and the resistive layer.

L'invention vise à remédier ces inconvénients en cherchant à corriger l'impédance de la charge résistive, soit en modifiant sa forme, soit en lui adjoignant une capacité, soit enfin en combinant les deux moyens précités.The invention aims to remedy these drawbacks by seeking to correct the impedance of the resistive load, either by modifying its shape, or by adding a capacitance thereto, or finally by combining the two aforementioned means.

Le dispositif selon l'invention comporte un conducteur constitué par une bande métallique déposée sur un substrat isolant et au moins une électrode de masse, la bande métallique étant raccordée à son extrémité à une couche résistive elle-même raccordée à la masse, le dispositif étant du type dans lequel la couche résistive est de largeur décroissante entre ses points de raccordement à la bande métallique et à la masse, ou dans lequel l'inductance propre de la couche résistive est compensée, dans la gamme de fréquence de fonctionnement, par au moins un dépôt conducteur couplé capacitivement avec cette électrode de masse et relié électriquement à cette couche résistive. Il est caractérisé en ce que la couche résistive est interrompue par une bande conductrice transversale située plus près du conducteur que du point de raccordement à la masse, deux dépôts conducteurs étant formés sur le substrat de part et d'autre des grands côtés du trapèze et reliés entre eux par la bande conductrice.The device according to the invention comprises a conductor constituted by a metal strip deposited on an insulating substrate and at least one ground electrode, the metal strip being connected at its end to a resistive layer itself connected to ground, the device being of the type in which the resistive layer is of decreasing width between its points of connection to the metal strip and to ground, or in which the inherent inductance of the resistive layer is compensated, in the operating frequency range, by at least a conductive deposit capacitively coupled with this ground electrode and electrically connected to this resistive layer. It is characterized in that the resistive layer is interrupted by a transverse conductive strip located closer to the conductor than to the ground connection point, two conductive deposits being formed on the substrate on either side of the long sides of the trapezoid and interconnected by the conductive strip.

L'invention sera mieux comprise, et d'autres caractéristiques ap- paraitront, au moyen de la description qui suit, et des dessins qui l'accompagnent, parmi lesquels :

  • la figure 1 est une vue en perspective d'une ligne microbande terminée par une charge gravée ;
  • les figures 2 à 6 représentent schématiquement diverses réalisations de l'invention.
The invention will be better understood, and other characteristics will appear, by means of the description which follows, and of the accompanying drawings, among which:
  • Figure 1 is a perspective view of a microstrip line terminated by an etched charge;
  • Figures 2 to 6 schematically represent various embodiments of the invention.

Un élément de ligne microbande, figure 1, comporte un substrat diélectrique 1, par exemple en alumine pure, sous la forme d'un parallépi- pède allongé et plat comportant deux grandes faces : l'une de ces faces est entièrement métallisée et constitue le plan de masse 2. L'autre n'est métallisée que sur une partie de sa largeur et constitue une bande 3 qui n'est autre que le conducteur supérieur de la ligne microbande. Cette bande est fabriquée par exemple par dépôt de couches successives de chrome, de cuivre et d'or. Elle se raccorde suivant une ligne droite transversale 11 à une couche 4 d'alliage résistif constituant une charge de terminaison. Cette couche 4 est elle-même raccordée suivant une ligne droite transversale 12 à une métallisation 5 reliée au plan de masse par une connexion de résistance ohmique négligeable. Le raccordement au plan de masse peut s'effectuer soit par gravure de la face terminale 6 du substrat, soit par soudure d'une bande métallique souple, non représentée, soit même par un trou métallisé (non représenté) entre les métallisations 5 et 2.A microstrip line element, FIG. 1, comprises a dielectric substrate 1, for example made of pure alumina, in the form of an elongated and flat parallelepiped having two large faces: one of these faces is entirely metallized and constitutes the ground plane 2. The other is metallized only over part of its width and constitutes a strip 3 which is none other than the upper conductor of the microstrip line. This strip is produced for example by depositing successive layers of chromium, copper and gold. It is connected along a transverse straight line 11 to a layer 4 of resistive alloy constituting a termination charge. This layer 4 is itself connected along a transverse straight line 12 to a metallization 5 connected to the ground plane by a connection of negligible ohmic resistance. The connection to the ground plane can be carried out either by etching the end face 6 of the substrate, or by welding a flexible metal strip, not shown, or even by a metallized hole (not shown) between the metallizations 5 and 2 .

La couche 4 est constituée par exemple par un dépôt d'alliage de nickel et de chrome, effectué par évaporation sous vide et atteignant quelques centaines d'angstrôms. On sait obtenir par cette méthode une résistance de couche de 25 ohms par carré. Pour obtenir une résistance de 50 ohms entre les lignes 11 et 12 on réalise alors un dépôt deux fois plus long que large, soit dans le cas d'un substrat d'alumine de 0,4 mm d'épaisseur, avec une bande 3 de 0,35 mm de largeur donnant sensiblement une ligne microbande de 50 ohms, une couche 4 de 0,7 mm de longueur.Layer 4 is constituted for example by a deposit of nickel and chromium alloy, carried out by evaporation under vacuum and reaching a few hundred angstroms. It is known to obtain a layer resistance of 25 ohms per square by this method. To obtain a resistance of 50 ohms between lines 11 and 12, a deposit twice as long as wide is then carried out, that is to say in the case of an alumina substrate 0.4 mm thick, with a strip 3 of 0.35 mm in width giving substantially a microstrip line of 50 ohms, a layer 4 of 0.7 mm in length.

Le dépôt d'alliage de nickel et de chrome peut être effectué avantageusement sur une plus grande longueur qu'il n'est nécessaire de telle sorte que l'on puisse ensuite ajuster facilement la longueur utile en déposant une couche d'or sur les parties à court-circuiter, en protégeant, pendant l'opération de dorure, la partie utile de la charge à l'aide d'une couche de résine obtenue par photomasquage.The deposit of nickel and chromium alloy can advantageously be carried out over a longer length than is necessary so that the useful length can then be easily adjusted by depositing a layer of gold on the parts. to short-circuit, by protecting, during the gilding operation, the useful part of the load using a resin layer obtained by photomasking.

Dans l'exemple choisi, le taux d'onde stationnaire constaté, pour une fréquence de 18 GHz, est supérieur à 3. Ceci est dû notamment au fait qu'à telle fréquence, la longueur d'onde dans le milieu de propagation (l'alumine du substrat) est de 6,5 mm, longueur devant laquelle celle d'une couche résistive de 0,7 mm n'est nullement négligeable. La résistance n'agit donc pas comme une constante localisée, ce qui explique en partie l'importance du taux d'ondes stationnaires observé.In the example chosen, the standing wave rate observed, for a frequency of 18 GHz, is greater than 3. This is due in particular to the fact that at such frequency, the wavelength in the propagation medium (l alumina of the substrate) is 6.5 mm, length before which that of a resistive layer of 0.7 mm is by no means negligible. The resistance therefore does not act as a localized constant, which partly explains the importance of the standing wave rate observed.

Dans un premier mode de réalisation de l'invention, schématisé à la figure 2, on donne à la couche 4 la forme d'un trapèze dont la grande base est la ligne de raccordement 11 et la petite base MN se raccorde à la métallisation 5 sur une longueur aussi petite que possible tout en obtenant un bon contact de retour de masse soit environ 0,03 mm. Si l'on appelle a et b les longueurs respectives de la ligne 11 et de la base MN, la résistance R (ohms) de la charge est donnée par la formule :

Figure imgb0001
dans laquelle R désigne la résistance par carré (en ohms) de la couche résistive 4, h est la hauteur du trapèze formé par cette couche, et "ln" signifie que l'on prend le logarithme népérien du rapport a/b.In a first embodiment of the invention, shown diagrammatically in FIG. 2, layer 4 is given the shape of a trapezoid, the large base of which is the connection line 11 and the small base MN is connected to the metallization 5 over a length as small as possible while obtaining a good ground return contact, ie approximately 0.03 mm. If we call a and b the respective lengths of line 11 and base MN, the resistance R (ohms) of the load is given by the formula:
Figure imgb0001
in which R denotes the resistance per square (in ohms) of the resistive layer 4, h is the height of the trapezoid formed by this layer, and "ln" means that we take the natural logarithm of the ratio a / b.

A titre d'exemple, si l'on a :

  • R = 26 ohms o
  • a = 0,35 mm
  • b = 0,03 mm
  • h = 0,25 mm

on obtient une charge de 50 ohms et un taux d'ondes stationnaires de l'ordre de 1,7 pour une fréquence de 18 GHz.For example, if we have:
  • R = 26 ohms o
  • a = 0.35 mm
  • b = 0.03 mm
  • h = 0.25 mm

a 50 ohm load is obtained and a standing wave rate of the order of 1.7 for a frequency of 18 GHz.

Dans un deuxième mode de réalisation, schématisé à la figure 3, on revient à une forme rectangulaire pour la couche 4, de même largeur que la bande 3, mais on intercale une bande conductrice transversale 30 conduisant à deux métallisations 31 et 32, lesquelles constituent les armatures de condensateurs dont l'autre armature est le plan de masse. A titre d'exemple les deux métallisations mesurent 100 microns de largeur sur 300 microns de longueur et sont reliées entre elles par une bande 30 de largeur égale à cent microns, distante d'environ 200 microns de la ligne 11. Pour une largeur de bande 3 de 350 microns, le taux d'ondes stationnaires observé est par exemple de 1,6 à 18 GHz.In a second embodiment, shown diagrammatically in FIG. 3, we return to a rectangular shape for the layer 4, of the same width as the strip 3, but a transverse conductive strip 30 is inserted, leading to two metallizations 31 and 32, which constitute the armatures of capacitors whose other armature is the ground plane. By way of example, the two metallizations measure 100 microns in width by 300 microns in length and are connected together by a band 30 of width equal to one hundred microns, distant about 200 microns from line 11. For a band width 3 of 350 microns, the standing wave rate observed is for example 1.6 to 18 GHz.

Dans une troisième réalisation, schématisé à la figure 4, on conjugue les modes de réalisation précédents. Pour une bande 30 située à 50 microns de la ligne 11 et des armatures de dimensions 100 x 150 microns on observe un taux d'ondes stationnaires de 1,3 pour une fréquence de 18 GHz.In a third embodiment, shown diagrammatically in FIG. 4, the preceding embodiments are combined. For a band 30 located at 50 microns from line 11 and armatures of dimensions 100 × 150 microns, a standing wave rate of 1.3 is observed for a frequency of 18 GHz.

On peut aussi constituer la charge résistive par une bande de largeur décroissante suivant une loi de décroissance non linéaire. Dans l'exemple illustré par la figure 5, la décroissance de largeur est d'autant plus faible pour la bande 4 que l'on s'éloigne de la ligne 11 séparant la bande 3 de la charge résistive.One can also constitute the resistive load by a strip of decreasing width according to a nonlinear law of decrease. In the example illustrated by FIG. 5, the decrease in width is all the smaller for the strip 4 as one moves away from the line 11 separating the strip 3 from the resistive load.

L'invention s'applique également aux lignes du type "stripline" où deux plans de masse sont séparés d'une bande centrale unique par deux substrats diélectriques. La bande peut être gravée sur un des substrats selon les mêmes caractéristiques que celles que l'on trouve aux figures 2 à 3.The invention also applies to lines of the "stripline" type where two ground planes are separated from a single central strip by two dielectric substrates. The strip can be etched on one of the substrates according to the same characteristics as those found in Figures 2 to 3.

L'invention s'applique également aux lignes coplanaires. A titre d'exemple on a représenté à la figure 6 une extrémité d'une telle ligne, comportant, sur un substrat 1, visible uniquement entre les métallisations, une bande conductrice 3 déposée par gravure entré deux bandes latérales 61 et 62 déposées par gravure entre deux bandes latérales 61 et 62 déposées en même temps que la bande 3 et raccordées entre elles par un dépôt 60 de même nature, constituant un retour de masse. Une couche résistive 4 de forme trapézoïdale est déposée de façon à se raccorder à la bande 3 d'une part et au dépôt 60 d'autre part. Des capacités 63 et 64 sont constituées par des dépôts isolants sur les bandes 63 et 64, dépôts recouverts ensuite d'une couche conductrice reliée à la couché 4 par des connexions 65 et 66, raccordées à la couche 4 par deux petites plages 67 et 68 constituées par dépôt d'or.The invention also applies to coplanar lines. By way of example, there is shown in FIG. 6 an end of such a line, comprising, on a substrate 1, visible only between the metallizations, a conductive strip 3 deposited by etching entered two lateral strips 61 and 62 deposited by etching between two lateral bands 61 and 62 deposited at the same time as the band 3 and connected together by a deposit 60 of the same kind, constituting a mass return. A resistive layer 4 of trapezoidal shape is deposited so as to be connected to the strip 3 on the one hand and to the deposit 60 on the other hand. Capacities 63 and 64 consist of insulating deposits on the strips 63 and 64, deposits then covered with a conductive layer connected to the layer 4 by connections 65 and 66, connected to layer 4 by two small pads 67 and 68 constituted by deposit of gold.

On peut aussi utiliser des pastilles nues de condensateurs céramiques pour constituer les capacités 63 et 64.It is also possible to use bare pads of ceramic capacitors to form the capacitors 63 and 64.

Claims (6)

1. Dispositif de charge adaptée à l'impédance caractéristique d'une ligne de transmission à structure plane, comportant un conducteur constitué par une bande métallique déposée sur un substrat isolant et au moins une électrode de masse, la bande métallique étant raccordée à son extrémité à une couche résistive elle-même raccordée à la masse, le dispositif étant du type dans lequel la couche résistive est de largeur décroissante entre ses points de raccordement à la bande métallique et à la masse, ou dans lequel l'inductance propre de la couche résistive est compensée, dans la gamme de fréquence de fonctionnement, par au moins un dépôt conducteur couplé capacitivement avec cette électrode de masse et relié électriquement à cette couche résistive, caractérisé en ce que la couche résistive, est interrompue par une bande conductrice transversale située plus près du conducteur que du point de raccordement à la masse, deux dépôts conducteurs étant formés sur le substrat de part et d'autre des grands côtés du trapèze et reliés entre eux par la bande conductrice.1. Charging device adapted to the characteristic impedance of a transmission line with a flat structure, comprising a conductor constituted by a metal strip deposited on an insulating substrate and at least one ground electrode, the metal strip being connected at its end to a resistive layer itself connected to ground, the device being of the type in which the resistive layer is of decreasing width between its points of connection to the metal strip and to ground, or in which the own inductance of the layer resistive is compensated, in the operating frequency range, by at least one conductive deposit capacitively coupled with this ground electrode and electrically connected to this resistive layer, characterized in that the resistive layer is interrupted by a transverse conductive strip located more near the conductor than at the ground connection point, two conductive deposits being formed on the substrate on either side of s long sides of the trapezoid and interconnected by the conductive strip. 2. Dispositif selon la revendication 1, caractérisé en ce que la couche résistive à la forme d'un trapèze dont la grande base est raccordée au conducteur et la petite base au plan de masse.2. Device according to claim 1, characterized in that the resistive layer in the form of a trapezium whose large base is connected to the conductor and the small base to the ground plane. 3. Dispositif selon la revendication 1, caractérisé en ce que la ligne est du type comportant deux plans de masse.3. Device according to claim 1, characterized in that the line is of the type comprising two ground planes. 4. Dispositif selon la revendication 1, caractérisé en ce que, la ligne de transmission étant du type coplanaire comportant un conducteur central et deux conducteurs latéraux et la couche résistive ayant la forme d'un trapèze, la grande base dudit trapèze est raccordée au conducteur central et la petite base aux conducteurs latéraux.4. Device according to claim 1, characterized in that, the transmission line being of the coplanar type comprising a central conductor and two lateral conductors and the resistive layer having the shape of a trapezoid, the large base of said trapezium is connected to the conductor central and the small base with lateral conductors. 5. Dispositif selon la revendication 5, caractérisé en ce que la couche résistive est reliée électriquement à des dépôts conducteurs formant avec les conducteurs latéraux des capacités de compensation d'inductance.5. Device according to claim 5, characterized in that the resistive layer is electrically connected to conductive deposits forming with the lateral conductors inductance compensation capacitors. 6. Dispositif selon la revendication 5, caractérisé en ce que la couche résistive est reliée à des pastilles nues de condensateurs céramiques placés sur les conducteurs latéraux.6. Device according to claim 5, characterized in that the resistive layer is connected to bare pellets of ceramic capacitors placed on the lateral conductors.
EP81400958A 1980-07-11 1981-06-16 Terminating arrangement for a microwave transmission line with minimal v.s.w.r. Expired EP0044758B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8015497A FR2486720A1 (en) 1980-07-11 1980-07-11 DEVICE FOR TERMINATING A TRANSMISSION LINE, IN HYPERFREQUENCY, AT MINIMUM STATIONARY WAVE RATES
FR8015497 1980-07-11

Publications (2)

Publication Number Publication Date
EP0044758A1 true EP0044758A1 (en) 1982-01-27
EP0044758B1 EP0044758B1 (en) 1984-05-16

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Family Applications (1)

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EP81400958A Expired EP0044758B1 (en) 1980-07-11 1981-06-16 Terminating arrangement for a microwave transmission line with minimal v.s.w.r.

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Country Link
US (1) US4413241A (en)
EP (1) EP0044758B1 (en)
DE (1) DE3163615D1 (en)
FR (1) FR2486720A1 (en)

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FR2525383A1 (en) * 1982-04-16 1983-10-21 Cables De Lyon Geoffroy Delore DISTRIBUTED CONSTANT RESISTORS FOR HEAVY DUTY MICROWAVE DISSIPATION LOADS
EP0195649A2 (en) * 1985-03-18 1986-09-24 Tektronix, Inc. Broad band, thin film attenuator and method for construction thereof
EP0363831A1 (en) * 1988-10-14 1990-04-18 Asea Brown Boveri Ag Reflectionless terminal of a TEM wave guide
EP0424536A1 (en) * 1989-02-02 1991-05-02 Fujitsu Limited Film resistor terminator for microstrip line
FR2779577A1 (en) * 1998-06-09 1999-12-10 Deti PASSIVE MICROWAVE COMPONENT WITH RESISTIVE LOAD HAVING INTEGRATED MICROWAVE ADJUSTMENT ELEMENTS

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US6600384B2 (en) 2001-05-18 2003-07-29 Endwave Corporation Impedance-compensating circuit
GB2383199B (en) * 2001-12-11 2005-11-16 Marconi Optical Components Ltd Transmission line structures
US20040085150A1 (en) * 2002-10-30 2004-05-06 Dove Lewis R. Terminations for shielded transmission lines fabricated on a substrate
DE10350033A1 (en) * 2003-10-27 2005-05-25 Robert Bosch Gmbh Component with coplanar line
KR20140037456A (en) * 2012-09-18 2014-03-27 한국전자통신연구원 Compact waveguide termination
JP6279189B2 (en) * 2016-01-12 2018-02-14 三菱電機株式会社 Terminator and high frequency circuit

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Cited By (11)

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FR2525383A1 (en) * 1982-04-16 1983-10-21 Cables De Lyon Geoffroy Delore DISTRIBUTED CONSTANT RESISTORS FOR HEAVY DUTY MICROWAVE DISSIPATION LOADS
EP0092137A1 (en) * 1982-04-16 1983-10-26 LES CABLES DE LYON Société anonyme dite: Distributed resistances for high-power loads in the microwave range
US4456894A (en) * 1982-04-16 1984-06-26 Les Cables De Lyon Distributed-constant resistance for use as a high dissipation load at hyperfrequencies
EP0195649A2 (en) * 1985-03-18 1986-09-24 Tektronix, Inc. Broad band, thin film attenuator and method for construction thereof
EP0195649A3 (en) * 1985-03-18 1988-08-10 Tektronix, Inc. Broad band, thin film attenuator and method for construction thereof
EP0363831A1 (en) * 1988-10-14 1990-04-18 Asea Brown Boveri Ag Reflectionless terminal of a TEM wave guide
US5055806A (en) * 1988-10-14 1991-10-08 Asea Brown Boveri Ltd. Reflection-free termination of a tem waveguide
EP0424536A1 (en) * 1989-02-02 1991-05-02 Fujitsu Limited Film resistor terminator for microstrip line
EP0424536A4 (en) * 1989-02-02 1991-07-03 Fujitsu Limited Film resistor terminator
FR2779577A1 (en) * 1998-06-09 1999-12-10 Deti PASSIVE MICROWAVE COMPONENT WITH RESISTIVE LOAD HAVING INTEGRATED MICROWAVE ADJUSTMENT ELEMENTS
WO1999065104A1 (en) * 1998-06-09 1999-12-16 Deti (Societe Anonyme) Resistive-load hyperfrequency passive component

Also Published As

Publication number Publication date
FR2486720A1 (en) 1982-01-15
EP0044758B1 (en) 1984-05-16
FR2486720B1 (en) 1984-08-10
US4413241A (en) 1983-11-01
DE3163615D1 (en) 1984-06-20

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