EP0102288B1 - Travelling wave tube with suppression means for parasitic oscillation - Google Patents
Travelling wave tube with suppression means for parasitic oscillation Download PDFInfo
- Publication number
- EP0102288B1 EP0102288B1 EP83401630A EP83401630A EP0102288B1 EP 0102288 B1 EP0102288 B1 EP 0102288B1 EP 83401630 A EP83401630 A EP 83401630A EP 83401630 A EP83401630 A EP 83401630A EP 0102288 B1 EP0102288 B1 EP 0102288B1
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- EP
- European Patent Office
- Prior art keywords
- auxiliary
- helix
- delay line
- supports
- tube according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
- H01J23/30—Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations
Definitions
- the present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations.
- the invention relates to the field of traveling wave tubes operating as an amplifier and having a delay line of the helix type, that is to say for example, a delay line of single helix, of double helix.
- the present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations and this tube comprises a delay line of the helical type placed in a metal sheath to which it is fixed by dielectric supports.
- the means for suppressing parasitic oscillations are constituted by at least one helical type auxiliary delay line, placed inside the sheath in one of the intervals between two adjacent dielectric supports, and periodically fixed to the sheath by metal supports. .
- the structure according to the invention allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being reduced, as is the case if the suppression means are fixed to the dielectric supports.
- a reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
- a helical delay line 1 belonging to a traveling wave tube.
- the electron gun and the traveling wave tube collector which are well known in the prior art, are not shown in the figure.
- This delay line is fixed in a sheath or sleeve 2, metallic and cylindrical, by three dielectric supports 3.
- the propeller and the supports are assembled by clamping in the sleeve.
- the propeller is made of tungsten, for example, and the supports are quartz, alumina, glucine or boron nitride.
- the sleeve can be made of copper.
- the propeller 1 is brazed to the dielectric supports 3 which are brazed to the sleeve 2.
- the propeller can then be made of copper, as can the sleeve, and the dielectric supports can be made of beryllium oxide, for example.
- the metal sleeve 2 is connected to ground, therefore to the reference potential of the tube.
- auxiliary delay lines 4 in a helix, are placed, inside the sheath, in each interval between two adjacent dielectric supports 3.
- These delay lines auxiliaries are periodically fixed to the sheath 2 by metal supports 5. They are coupled to the main propeller 1, but have no material contact with it.
- the auxiliary delay lines can be copper, molybdenum or tungsten, for example, and the metal supports can be platinum.
- auxiliary delay lines with periodic grounding, constitute means for suppressing parasitic oscillations because they produce an attenuation which varies with frequency; this attenuation is very important for the frequencies close to the cut-off frequency, for which parasitic oscillations can occur and this attenuation is much weaker for the other operating frequencies.
- auxiliary propellers i.e. the diameter of the wire which constitutes them, their pitch, their diameter ..., as well as the dimensions of the metal supports are calculated to greatly attenuate the frequency zone in which can be produce parasitic oscillations. This frequency zone can be known with precision.
- the auxiliary propellers therefore constitute resonant circuits.
- the length of the auxiliary propellers which is between two adjacent metallic supports is substantially equal to half the wavelength of the center frequency of the frequency zone to be attenuated. However, this length is modified in particular so that there is an integer number of turns between two adjacent metal supports.
- a metal support is provided in contact with each auxiliary propeller every four steps of this propeller.
- the ends of the auxiliary propellers are constituted by points to ground, that is to say that the auxiliary propellers end in a part in contact with metal supports 5.
- Variable coupling can be achieved between the auxiliary propellers and the main propeller by varying the thickness of the metal supports 5.
- the thickness of the metal supports 5 is such that there can be no contact between the main propeller and the auxiliary propellers. There is only a coupling between these propellers, but no material contact.
- the means for suppressing parasitic oscillations therefore consist of one or more auxiliary delay lines periodically connected to the sheath grounded by metal supports; it should be noted that this structure allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being diminished, as would be the case if the suppression means were fixed to the dielectric supports. A reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
- the means for suppressing parasitic oscillations according to the invention are light, compact, simple to make and easily installed. It should be noted in particular that it is not necessary, during assembly, to position the auxiliary propellers very precisely with respect to the main propeller. As the pitch of the auxiliary propellers is much lower than that of the main propeller, there are always between two successive turns of the main propeller several turns of auxiliary propeller.
- the invention applies to traveling wave tubes having a main delay line in a helix, or derived from the helix.
- This delay line can for example be a double helix, that is to say made up of two identical helices, coming from the same point and with reverse winding directions.
- auxiliary delay lines are of the helical type, that is to say single helix, double helix, of the "ring and bar” type, of the "ring and loop” type.
- delay lines of the helical type are chosen because they have an aerated structure which allows coupling with the main delay line.
- the invention covers embodiments where an auxiliary delay line is provided in each interval between two adjacent dielectric supports or only in some of these intervals. There can therefore be one, two, three, and even a greater number of auxiliary helices depending on the number of dielectric supports.
- the invention covers the embodiments where the auxiliary delay lines are present all along the main delay line or only on a part of it, for example towards the exit of this line which is an area strong interaction.
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- Microwave Tubes (AREA)
Description
La présente invention concerne un tube à onde progressive comportant des moyens de suppression des oscillations parasites.The present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations.
L'invention concerne le domaine des tubes à onde progressive fonctionnant en amplificateur et ayant une ligne à retard du type en hélice, c'est-à-dire par exemple, une ligne à retard en hélice simple, en hélice double.The invention relates to the field of traveling wave tubes operating as an amplifier and having a delay line of the helix type, that is to say for example, a delay line of single helix, of double helix.
Le probléme qui se pose avec ces tubes est d'éviter l'apparition d'oscillations parasites sur le mode inverse (ou "carcinotron"), ou à la coupure, surtout lorsque l'amplification se fait dans une large bande et lorsque les puissances sont élevées.The problem which arises with these tubes is to avoid the appearance of parasitic oscillations in the reverse mode (or "carcinotron"), or in the cut-off, especially when the amplification is done in a broad band and when the powers are high.
On connait par la demande de brevet français 2.380.633 un tube à onde progressive dans lesquel les oscillations parasites sont atténuées par couplage d'éléments à perte résonnants qui sont fixés sur des supports diélectriques portés par l'enveloppe métallique du tube.We know from French patent application 2,380,633 a traveling wave tube in which the parasitic oscillations are attenuated by coupling of resonant loss elements which are fixed on dielectric supports carried by the metal casing of the tube.
Selon la revendication 1, la présente invention concerne un tube à onde progressive comportant des moyens de suppression des oscillations parasites et ce tube comprend, une ligne à retard du type en hélice placée dans un fourreau métallique auquel elle est fixée par des supports diélectriques. Les moyens de suppression des oscillations parasites sont constitués par au moins une ligne à retard auxiliaire du type en hélice, placée à l'intérieur du fourreau dans l'un des intervalles entre deux supports diélectriques adjacents, et périodiquement fixée au fourreau par des supports métalliques.According to claim 1, the present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations and this tube comprises a delay line of the helical type placed in a metal sheath to which it is fixed by dielectric supports. The means for suppressing parasitic oscillations are constituted by at least one helical type auxiliary delay line, placed inside the sheath in one of the intervals between two adjacent dielectric supports, and periodically fixed to the sheath by metal supports. .
La structure selon l'invention permet la suppression des oscillations parasites sans que les propriétés isolantes des supports diélectriques soient diminuées, comme c'est le cas si les moyens de suppression sont fixés aux supports diélectriques. Une diminution des propiétés isolantes des supports diélectriques limite les possibilités de monter en puissance crête par risque de claquage du diélectrique.The structure according to the invention allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being reduced, as is the case if the suppression means are fixed to the dielectric supports. A reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
Parmi les nombreux avantages de l'invention, on peut citer:
- - le fait que les moyens de suppression des oscillations parasites qui sont utilisés sont légers et peu encombrants, et en particulier ne nécessitent pas un accroissement des dimensions du fourreau;
- - le fait que ces moyens soient simples à réaliser et facilement mis en place;
- - la possibilité de réaliser un couplage variable entre les lignes à retard auxiliaires et la ligne à retard principale;
- - le fait que ces moyens, qui sont constitués par des hélices auxiliaires reliées périodiquement au fourreau par des supports métalliques, ne modifient pas les propriétés isolantes des supports diélectriques de l'hélice principale;
- - le fait que l'on puisse atteindre une puissance crête élevée sans claquage entre les spires des hélices auxilaires car ces spires sont dans le vide.
- - The fact that the means for suppressing parasitic oscillations which are used are light and space-saving, and in particular do not require an increase in the dimensions of the sheath;
- - the fact that these means are simple to carry out and easily implemented;
- - the possibility of carrying out a variable coupling between the auxiliary delay lines and the main delay line;
- - the fact that these means, which consist of auxiliary helices periodically connected to the sheath by metal supports, do not modify the insulating properties of the dielectric supports of the main propeller;
- - The fact that we can reach a high peak power without breakdown between the turns of the auxiliary propellers because these turns are in a vacuum.
D'autres objets, caractéristiques et résultats de l'invention ressortiront de la description suivante, donnée à titre d'exemple non limitatif et illustrée par la figure annexée qui represente une vue en perspective éclatée d'un mode de réalisation d'une partie d'un tube selon l'invention.Other objects, characteristics and results of the invention will emerge from the following description, given by way of nonlimiting example and illustrated by the appended figure which represents an exploded perspective view of an embodiment of a part d 'a tube according to the invention.
Sur cette figure, les mêmes repères désignent les mêmes éléments, mais, pour des raisons de clarté, les cotes et proportions des divers éléments ne sont pas respectées.In this figure, the same references designate the same elements, but, for reasons of clarity, the dimensions and proportions of the various elements are not respected.
Sur cette figure, on voit une partie d'une ligne à retard en hélice 1 appartenant à un tube à onde progressive. On n'a pas represente sur la figure le canon à électrons, ni le collecteur du tube a onde progressive qui sont bien connus de l'art antérieur. Cette ligne à retard est fixée dans un fourreau ou manchon 2, métallique et cylindrique, par trois supports diélectriques 3.In this figure, we see part of a helical delay line 1 belonging to a traveling wave tube. The electron gun and the traveling wave tube collector, which are well known in the prior art, are not shown in the figure. This delay line is fixed in a sheath or
Pour les tubes à onde progressive fonctionnant à des niveaux de puissance relativement peu élevés, l'hélice et les supports sont assemblés par serrage dans le manchon. L'hélice est en tungstène, par exemple, et les supports en quartz, alumine, glucine ou nitrure de bore. Le manchon peut être en cuivre.For traveling wave tubes operating at relatively low power levels, the propeller and the supports are assembled by clamping in the sleeve. The propeller is made of tungsten, for example, and the supports are quartz, alumina, glucine or boron nitride. The sleeve can be made of copper.
Pour les tubes à onde progressive fonctionnant à des puissances plus élevées, l'hélice 1 est brasée aux supports diélectriques 3 qui sont brasés au manchon 2.For traveling wave tubes operating at higher powers, the propeller 1 is brazed to the dielectric supports 3 which are brazed to the
L'hélice peut alors être en cuivre, ainsi que le manchon, et les supports diélectriques peuvent être en oxyde de béryllium, par exemple.The propeller can then be made of copper, as can the sleeve, and the dielectric supports can be made of beryllium oxide, for example.
Le manchon métallique 2 est relie à la masse, donc au potentiel de référence du tube.The
Selon un mode de réalisation de l'invention, on voit sur le figure que trois lignes à retard auxiliaires 4, en hélice, sont placées, à l'intérieur du fourreau, dans chaque intervalle entre deux supports diélectriques adjacents 3. Ces lignes à retard auxiliaires sont périodiquement fixées au fourreau 2 par des supports métalliques 5. Elles sont couplées à l'hélice principale 1, mais n'ont pas de contact matériel avec elle. Les lignes à retard auxiliaires peuvent être en cuivre, en molybdène ou en tungstène, par exemple, et les supports métalliques peuvent être en platine.According to one embodiment of the invention, it can be seen in the figure that three
Ces trois lignes à retard auxiliaires, avec mise à la masse périodique, constituent des moyens de suppression des oscillations parasites car elles produisent une atténuation qui varie avec la fréquence; cette attenuation est très importante pour les fréquences proches de la fréquence de coupure, pour lesquelles des oscillations parasites peuvent se produire et cette atténuation est beaucoup plus faible pour les autres fréquences de fonctionnement.These three auxiliary delay lines, with periodic grounding, constitute means for suppressing parasitic oscillations because they produce an attenuation which varies with frequency; this attenuation is very important for the frequencies close to the cut-off frequency, for which parasitic oscillations can occur and this attenuation is much weaker for the other operating frequencies.
Les dimensions des hélices auxiliaires, c'est-à-dire le diamètre du fil qui les constitue, leur pas, leur diamètre..., ainsi que les dimensions des supports métalliques sont calculées pour atténuer fortement la zone de fréquence dans laquelle peuvent se produire des oscillations parasites. Cette zone de fréquence peut être connue avec précision. Les hélices auxiliaires constituent donc des circuits résonnants.The dimensions of the auxiliary propellers, i.e. the diameter of the wire which constitutes them, their pitch, their diameter ..., as well as the dimensions of the metal supports are calculated to greatly attenuate the frequency zone in which can be produce parasitic oscillations. This frequency zone can be known with precision. The auxiliary propellers therefore constitute resonant circuits.
En général, la longueur des hélices auxiliaires qui est comprise entre deux supports métalliques adjacents est sensiblement égale à la moitié de la longueur d'onde de la fréquence centrale de la zone de fréquences à atténuer. On modifie cependant cette longueur en particulier pour qu'il y ait un nombre entier de spires entre deux supports métalliques adjacents.In general, the length of the auxiliary propellers which is between two adjacent metallic supports is substantially equal to half the wavelength of the center frequency of the frequency zone to be attenuated. However, this length is modified in particular so that there is an integer number of turns between two adjacent metal supports.
Ainsi, par exemple, dans un cas particulier, on a obtenu les dimensions suivantes:
- - hélice principe:
- - diamètre exterieur: 1,8 mm
- - pas:1,15 mm
- - fourreau:
- - diamètre intérieur: 4 mm
- - hélice auxiliaire:
- - diamètre extérieur: 0,585 mm
- - pas: 0,4 mm
- - principle propeller:
- - outside diameter: 1.8 mm
- - pitch: 1.15 mm
- - scabbard:
- - inside diameter: 4 mm
- - auxiliary propeller:
- - outside diameter: 0.585 mm
- - pitch: 0.4 mm
Dans ce cas particulier, il est prévu un support métallique en contact avec chaque hélice auxiliaire tous les quatre pas de cette hélice.In this particular case, a metal support is provided in contact with each auxiliary propeller every four steps of this propeller.
Dans le mode de réalisation de l'invention représenté sur la figure, on constate que les extrémités des hélices auxilaires sont constituées par des points à la masse, c'est-à-dire que les hélices auxiliaires se terminent par une partie en contact avec les supports métalliques 5.In the embodiment of the invention shown in the figure, it can be seen that the ends of the auxiliary propellers are constituted by points to ground, that is to say that the auxiliary propellers end in a part in contact with metal supports 5.
On peut réaliser un couplage variable entre les hélices auxiliaires et l'hélice principale en faisant varier l'épaisseur des supports métalliques 5.Variable coupling can be achieved between the auxiliary propellers and the main propeller by varying the thickness of the metal supports 5.
Il est bien entendu que l'épaisseur des supports métalliques 5 est telle qu'il ne puisse pas y avoir de contact entre l'hélice principale et les hélices auxiliaires. Il existe seulement un couplage entre ces hélices, mais pas de contact matériel.It is understood that the thickness of the metal supports 5 is such that there can be no contact between the main propeller and the auxiliary propellers. There is only a coupling between these propellers, but no material contact.
Selon l'invention, les moyens de suppression des oscillations parasites sont donc constitués par une ou plusieurs lignes à retard auxiliaires reliées périodiquement au fourreau mis à la masse par des supports métalliques; il faut noter que cette structure permet la suppression des oscillations parasites sans que les propriétés isolantes des supports diélectriques soient diminuées, comme ce serait le cas si les moyens de suppression étaient fixés aux supports diélectriques. Une diminution des propriétés isolantes des supports diélectriques limite les possibilités de monter en puissance crête par risque de claquage du diélectrique.According to the invention, the means for suppressing parasitic oscillations therefore consist of one or more auxiliary delay lines periodically connected to the sheath grounded by metal supports; it should be noted that this structure allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being diminished, as would be the case if the suppression means were fixed to the dielectric supports. A reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
Enfin, comme cela a déjà été signalé, les moyens de suppression des oscillations parasites selon l'invention sont légers, peu encombrants, simples a realiser et facilement mis en place. On peut noter en particulier qu'il n'est pas nécessaire, lors du montage, de positionner très précisément les hélices auxiliaires par rapport à l'hélice principale. Comme le pas des hélices auxiliaires est très inférieur à celui de l'hélice principale, il y a toujours entre deux spires successives de l'hélice principale plusieurs spires d'hélice auxiliaire.Finally, as already mentioned, the means for suppressing parasitic oscillations according to the invention are light, compact, simple to make and easily installed. It should be noted in particular that it is not necessary, during assembly, to position the auxiliary propellers very precisely with respect to the main propeller. As the pitch of the auxiliary propellers is much lower than that of the main propeller, there are always between two successive turns of the main propeller several turns of auxiliary propeller.
Il faut noter que l'invention s'applique aux tubes à onde progressive possédant une ligne à retard principale en hélice, ou dérivée de l'hélice. Cette ligne à retard peut être par exemple en hélice double, c'est-à-dire constituée de deux hélices identiques, issues d'un même point et de sens d'enroulement inversés.It should be noted that the invention applies to traveling wave tubes having a main delay line in a helix, or derived from the helix. This delay line can for example be a double helix, that is to say made up of two identical helices, coming from the same point and with reverse winding directions.
En ce qui concerne les lignes à retard auxiliaires, elles sont du type, en hélice, c'est-à-dire en hélice simple, en hélice double, du type "ring and bar", du type "ring and loop"... Pour constituer ces lignes à retard auxiliaires, on choisit des lignes à retard du type en hélice car elles ont une structure aérée qui permet le couplagé avec la ligne à retard principale.As regards the auxiliary delay lines, they are of the helical type, that is to say single helix, double helix, of the "ring and bar" type, of the "ring and loop" type. To constitute these auxiliary delay lines, delay lines of the helical type are chosen because they have an aerated structure which allows coupling with the main delay line.
L'invention couvre les modes de réalisation où une ligne à retard auxiliaire est prévue dans chaque intervalle entre deux supports diélectriques adjacents ou seulement dans certains de ces intervalles. Il peut donc y avoir, une, deux, trois, et même un plus grand nombre, d'hélices auxiliaires selon le nombre de supports diélectriques.The invention covers embodiments where an auxiliary delay line is provided in each interval between two adjacent dielectric supports or only in some of these intervals. There can therefore be one, two, three, and even a greater number of auxiliary helices depending on the number of dielectric supports.
De même, l'invention couvre les modes de réalisation où les lignes à retard auxiliaires sont présentes tout le long de la ligne à retard principale ou seulement sur une partie de celle-ci, par exemple vers la sortie de cette ligne qui est une zone de forte interaction.Likewise, the invention covers the embodiments where the auxiliary delay lines are present all along the main delay line or only on a part of it, for example towards the exit of this line which is an area strong interaction.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8214433A FR2532109A1 (en) | 1982-08-20 | 1982-08-20 | PROGRESSIVE WAVE TUBE HAVING MEANS FOR SUPPRESSING PARASITE OSCILLATIONS |
| FR8214433 | 1982-08-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0102288A1 EP0102288A1 (en) | 1984-03-07 |
| EP0102288B1 true EP0102288B1 (en) | 1987-06-10 |
Family
ID=9276986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83401630A Expired EP0102288B1 (en) | 1982-08-20 | 1983-08-09 | Travelling wave tube with suppression means for parasitic oscillation |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4559474A (en) |
| EP (1) | EP0102288B1 (en) |
| DE (1) | DE3372039D1 (en) |
| FR (1) | FR2532109A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2629634B1 (en) * | 1984-12-18 | 1990-10-12 | Thomson Csf | PROGRESSIVE WAVE TUBE HAVING A PROPELLER-TYPE DELAY LINE FIXED TO A SLEEVE THROUGH BORON NITRIDE DIELECTRIC SUPPORT |
| US4912366A (en) * | 1987-12-07 | 1990-03-27 | Raytheon Company | Coaxial traveling wave tube amplifier |
| FR2683091A1 (en) * | 1991-10-25 | 1993-04-30 | Thomson Tubes Electroniques | IMPROVED COOLING DEVICE FOR HYPERFREQUENCY TUBE. |
| FR2758888B1 (en) * | 1997-01-27 | 1999-04-23 | Thomson Csf | PROCESS FOR FINE MODELING OF CLOUD GROUND RECEIVED BY RADAR |
| FR2787918B1 (en) | 1998-12-23 | 2001-03-16 | Thomson Tubes Electroniques | MULTIBAND PROGRESSIVE WAVE TUBE OF REDUCED LENGTH CAPABLE OF OPERATING AT HIGH POWER |
| US6356022B1 (en) | 2000-07-07 | 2002-03-12 | Ampwave Tech, Llc | Tapered traveling wave tube |
| US6356023B1 (en) | 2000-07-07 | 2002-03-12 | Ampwave Tech, Llc | Traveling wave tube amplifier with reduced sever |
| US7654407B1 (en) * | 2005-11-29 | 2010-02-02 | Obrecht Bruce E | Garbage can holder |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2828440A (en) * | 1950-06-22 | 1958-03-25 | Rca Corp | Traveling wave electron tube |
| FR1109184A (en) * | 1954-07-16 | 1956-01-23 | Csf | Improvements to helical delay lines |
| US2921224A (en) * | 1954-12-06 | 1960-01-12 | Bell Telephone Labor Inc | Traveling wave tube amplifier |
| US2971114A (en) * | 1959-07-23 | 1961-02-07 | Daniel G Dow | Helically-strapped multifilar helices |
| NL259077A (en) * | 1960-02-08 | |||
| US3142777A (en) * | 1963-07-15 | 1964-07-28 | Varian Associates | Traveling wave tubes having helix derived slow-wave circuits with tapered support stubs and loading means |
| FR2075837A1 (en) * | 1969-12-16 | 1971-10-15 | Thomson Csf | |
| US3903449A (en) * | 1974-06-13 | 1975-09-02 | Varian Associates | Anisotropic shell loading of high power helix traveling wave tubes |
| US4107575A (en) * | 1976-10-04 | 1978-08-15 | The United States Of America As Represented By The Secretary Of The Navy | Frequency-selective loss technique for oscillation prevention in traveling-wave tubes |
| US4158791A (en) * | 1977-02-10 | 1979-06-19 | Varian Associates, Inc. | Helix traveling wave tubes with resonant loss |
| FR2390633A1 (en) * | 1977-05-09 | 1978-12-08 | Renault | Gear synchroniser for vehicle gearbox - has flexible ring between flat and conical face to pick up drive |
| US4282457A (en) * | 1979-06-18 | 1981-08-04 | Raytheon Company | Backward wave suppressor |
| US4296354A (en) * | 1979-11-28 | 1981-10-20 | Varian Associates, Inc. | Traveling wave tube with frequency variable sever length |
| US4358704A (en) * | 1980-09-02 | 1982-11-09 | Varian Associates, Inc. | Helix traveling wave tubes with reduced gain variation |
-
1982
- 1982-08-20 FR FR8214433A patent/FR2532109A1/en active Granted
-
1983
- 1983-08-09 EP EP83401630A patent/EP0102288B1/en not_active Expired
- 1983-08-09 DE DE8383401630T patent/DE3372039D1/en not_active Expired
- 1983-08-15 US US06/523,624 patent/US4559474A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4559474A (en) | 1985-12-17 |
| FR2532109B1 (en) | 1985-05-24 |
| FR2532109A1 (en) | 1984-02-24 |
| DE3372039D1 (en) | 1987-07-16 |
| EP0102288A1 (en) | 1984-03-07 |
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