US3200286A - Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations - Google Patents
Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations Download PDFInfo
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- US3200286A US3200286A US79893A US7989360A US3200286A US 3200286 A US3200286 A US 3200286A US 79893 A US79893 A US 79893A US 7989360 A US7989360 A US 7989360A US 3200286 A US3200286 A US 3200286A
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- wave
- helix
- slow
- traveling wave
- oscillations
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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
- H01J23/26—Helical slow-wave structures; Adjustment therefor
- H01J23/27—Helix-derived slow-wave structures
-
- 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
- H01J23/26—Helical slow-wave structures; Adjustment therefor
Definitions
- the present invention relates in general to electron discharge devices and more particularly to improvements in the slow-wave structure which carries the radio frequency wave in a traveling wave amplifier tube.
- a difficulty encountered in the operation of a traveling wave amplifier tube embodying a single helix as a slow-wave structure concerns the production of unwanted oscillations by way of the so-called backward wave.
- These backward wave oscillations result from the interaction of the electron beam with a Fourier component of the wave in which the energy is propagating in the opposite direction to the beam.
- This Fourier component has a phase velocity in the direction of the beam and substantially equal to its velocity.
- Such oscillations are possible in any traveling wave tube embodying a single helix as a slow-Wave structure and particularly if the beam almost fills the helix.
- an object of this invention to provide improved methods and apparatus for producing backward wave attenuation for the propagating structure of a traveling wave amplifier tube.
- One feature of the present invention is the provision of a filter type stop band which is introduced in the single helix circuit of a traveling wave amplifier tube by a perturbation in impedance approximately every onedzfifizdfi Patented Aug. ltd, 1965 half wavelength of the backward wave oscillation frequency.
- Another feature of the present invention is the provision of non-uniformities in the cross section of a slow- Wave helix in a traveling wave amplifier tube.
- Still another feature of the present invention is the provision of non-uniformities in the cross section of a slow-wave helix in a traveling wave amplifier tube wherein the non-uniformities lie along a path having the form of a spiral whose pitch is such that the spiral will intersect the main slow-Wave helix approximately once for every half wavelength of the helix at the frequency which is desired as the center of a stop band.
- FIG. 2 is an elevational view enlarged of a wire or tape suitable for use in the helix of FIG. 1, and
- FIG. 3 is a dispersion diagram for traveling wave amplifier tube.
- a traveling wave amplifier tube which includes a hollow cylindrical metal casing 10 for the slow-wave helix or helical conductor H and the sapphire helix support rods 12.
- the novel helix 11 will be more fully described below.
- the metal casing 16 ⁇ is closed at one end by a collector 13 and associated cylindrical support 14 and closed at its other end by an electron gun structure 15, including the cathode l6, and associated cylindrical anode 17.
- the collector 13 has a central evacuation bore 18 terminated by a pinch-oil tube 19 molded into the insulator plug 2d. Enclosing a portion of the collector l3 and the insulator plug 2t ⁇ is the thermally conductive cylinder 21 and associated cooling fins 37 which provide a large area for the transfer of heat to a surrounding cooling medium.
- a magnetic focusing coil 23 is enclosed by aluminum cylinders 24 and the associated aluminum annular closures 25 which are supported by the radially extending arms 26 and the aluminum ring 27.
- cathode and heater potential are supplied by the leads 23 and 29 to the electron gun 15 which projects a beam of electrons along the axis of tne casing 10.
- the beam of electrons is accelerated and focused by the anode 17 and focusing coil 23 before being collected by the collector 13.
- Radio frequency energy to be amplified is coupled to the slow-wave helix 11 by input terminal 31 and associated coaxial lead-in 32.
- the amplified radio frequency energy is taken from the slowwave helix 11 at output terminal 33 and associated coaxial lead-out 34 after having exchanged energy with the electron beam all along the slow-wave helix.
- FIG. 2 A. portion of the novel slow-wave helix 11 in FIG. 1 is more clearly shown in FIG. 2. Notches 39 are placed at uniform intervals along one side of the tape helix 11 and the notches 46* are placed at uniform intervals along the other side of helix 1]. so as to form discrete areas of non-uniform cross section.
- the areas of reduced cross section formed by the notches 39 and 4d are staggered so that a notch 39 in one turn of the helix 11 will be directly opposite a notch 40 on a successive turn forming enlarged openings 41 between successive turns of the helix 11.
- the spacing between the openings 41 is selected so as to provide perturbations in the characteristic impedance of the helix 11 every one-half wavelength of the backward wave oscillation frequency.
- Such a spacing will exist if the successive openings 41 lie along the path having the form of a spiral whose pitch is determined by where P is the pitch of the spiral formed by the opening 41;, P is the pitch of the slow-wave helix 11, f is the frequency at which the slow-wave propagates one-half wavelength per turn of helix, and f is the desired stop band center frequency.
- the width of the stop band produced is related to both width and depth of the notches 39 and 40. Therefore, the width of stop band desired will be one factor in determining the dimensions of the notches. Certain mechanical and physical limitations must also be considered, however.
- the depth of the notches 39 and 40 must not be so great as to unduly weaken the tape helix 11, for example.
- the ridges 42 will replace the notches in forming the non-uniform portions along the helix. In this case, the areas of increased cross section formed by the ridges 42 would accomplish the same result as was formerly done by the notches 39 and 40.
- PEG. 3 shows a diagram in which wave velocity (V/c) is plotted along the vertical axis and Ka is plotted along the horizontal axis where Ka is a normalized parameter proportional to frequency and numerically equal to the number of wavelengths per turn.
- Line 43 represents the forward wave velocity and line 44 represents the backward wave velocity for a particular helix.
- a forward wave amplifier operating with the electron velocity synchronous to the nondispersive forward wave velocity of a helix will produce backward wave oscillation at the frequency represented by the dotted line 45. This is normally a frequency at which Ka equals 0.5.
- a spiral path formed by the openings 41 which would produce a stop band for this frequency would have an infinite pitch.
- Such a stop band could be easily produced by a once per turn notch causing the openings 41 to form a straight line on the surface of the helix 11.
- a traveling wave power tube is nearly always operated at a different beam velocity than that represented by fiat portion of the forward wave curve 43, because of dispersion, space charge, and large signal effects.
- a traveling wave tube operated at a beam velocity (Ve/c) represented by the dotted line 4-6 will produce backward wave oscillation at a frequency (F rep resented by the dotted line 47.
- a stop band at this frequency would require that the openings 41 form a spiral having a pitch opposite to that of the helix 11 similar to that h wn in FI 1.
- the type of notch arrangement shown in FIG. 1 may be designed to produce a desired stop band in a traveling wave amplifier tube without interfering with the interior structure of the traveling wave tube or substantially affecting the forward wave characteristic impedance of its slowwave helix.
- apparatus for propagating the radio frequency wave comprising a slow-wave helical conductor, said slow-wave helical conductor having discrete areas of non-uniform cross section at uniform intervals along the helical conductor to provide a stop band for backward wave oscillations, and wherein each of said discrete areas of non-uniform cross section lie along a path having the form of a spiral, and the pitch of said spiral is different than the pitch of said slow-wave helical conductor.
- apparatus for propagating the radio frequency wave comprising a slow-wave helical conductor, said slow-wave helical conductor having discrete areas of non-uniform cross section at uniform intervals along the helical conductor to provide a stop band for backward wave oscillations, the spacing be tween said discrete areas of non-uniform cross section being substantially equal to one-half wave length of the backward wave oscillation frequency.
- each of said discrete areas of non-uniform cross section lie along a path having the form of a spiral, and the pitch of said spiral is different than the pitch of said slow-wave helical conductor.
- a traveling Wave amplifier device as claimed in claim 8 wherein the pitch of said spiral is substantially equal to f P /f f where P is the pitch of said slow- Wave helical conductor, f is the frequency at which the slow-wave propagates one-half Wavelength per turn of helical conductor, and i is the center frequency of said stop band for backward Wave oscillations.
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- Microwave Tubes (AREA)
- Microwave Amplifiers (AREA)
Description
United States Patent 31,290,236 TRAVEMNG WAVE AMPLHFEER TUBE HAVENG NUVEL S'iGF-EBAND MEANS TO PREVENT BACKWARD WAVE GSiIlLLATlONS William L. Borden, Nevada Qity, ali., assignor to Varian Associates, Palo Alto, (Dalifi, a corporation of (Ialitornia Filed Dec. 30, 196d, Ser. No. 7?,893 ill Claims. (Cl. Sid-3.5)
The present invention relates in general to electron discharge devices and more particularly to improvements in the slow-wave structure which carries the radio frequency wave in a traveling wave amplifier tube.
Traveling wave amplifier tubes of the type to which the present invention is applicable comprise an electron gun adapted to generate a narrow beam of electrons mounted at one end of an elongated tubular envelope, abeam collector mounted at the opposite end of the envelope, and between the two and surrounding the path of the electron beam there is positioned a slow-wave guide which, in the form to which the present invention particularly relates, comprises a long, slender helix. Terminals are provided at the input or electron gun end ofr supplying to the helix the high frequency signal which is to be amplified by the tube, and terminals for connecting to a load are provided at the output or collector end of the helix. The dimensions of the helix, including diameter and pitch, along which the radio frequency wave is propagated are such that the longitudinal phase elocity of the wave is substantially equal to the velocity of the electron beam which is directed longitudinally of the helix.
A difficulty encountered in the operation of a traveling wave amplifier tube embodying a single helix as a slow-wave structure concerns the production of unwanted oscillations by way of the so-called backward wave. These backward wave oscillations result from the interaction of the electron beam with a Fourier component of the wave in which the energy is propagating in the opposite direction to the beam. This Fourier component has a phase velocity in the direction of the beam and substantially equal to its velocity. Such oscillations are possible in any traveling wave tube embodying a single helix as a slow-Wave structure and particularly if the beam almost fills the helix.
instability caused by oscillations of this kind may be prevented by providing slight perturbations or non-uniformities in the characteristic impedance of the wave conducting helix. One means of obtaining such perturbations is to provide internal grooves on the casing which encloses the slowwave guide. Procedures for forming these internal grooves are relatively difiicult and costly, however. This is especially true when it is desired to use a slow-wave guide casing made of metal for reasons of production, ruggedness, etc.
It is, therefore, an object of this invention to provide improved methods and apparatus for producing backward wave attenuation for the propagating structure of a traveling wave amplifier tube.
One feature of the present invention is the provision of a filter type stop band which is introduced in the single helix circuit of a traveling wave amplifier tube by a perturbation in impedance approximately every onedzfifizdfi Patented Aug. ltd, 1965 half wavelength of the backward wave oscillation frequency.
Another feature of the present invention is the provision of non-uniformities in the cross section of a slow- Wave helix in a traveling wave amplifier tube.
Still another feature of the present invention is the provision of non-uniformities in the cross section of a slow-wave helix in a traveling wave amplifier tube wherein the non-uniformities lie along a path having the form of a spiral whose pitch is such that the spiral will intersect the main slow-Wave helix approximately once for every half wavelength of the helix at the frequency which is desired as the center of a stop band.
These and other objects and features as well as the advantages arising from the present invention will be apparent from the following description of a preferred embodiment thereof as shown in the drawings wherein:
FIG. 1 is a sectional view of a traveling wave tube embodying the present invention,
FIG. 2 is an elevational view enlarged of a wire or tape suitable for use in the helix of FIG. 1, and
FIG. 3 is a dispersion diagram for traveling wave amplifier tube.
Referring to the drawings there is shown one embodiment of the invention in a traveling wave amplifier tube which includes a hollow cylindrical metal casing 10 for the slow-wave helix or helical conductor H and the sapphire helix support rods 12. The novel helix 11 will be more fully described below. The metal casing 16} is closed at one end by a collector 13 and associated cylindrical support 14 and closed at its other end by an electron gun structure 15, including the cathode l6, and associated cylindrical anode 17.
The collector 13 has a central evacuation bore 18 terminated by a pinch-oil tube 19 molded into the insulator plug 2d. Enclosing a portion of the collector l3 and the insulator plug 2t} is the thermally conductive cylinder 21 and associated cooling fins 37 which provide a large area for the transfer of heat to a surrounding cooling medium.
A magnetic focusing coil 23 is enclosed by aluminum cylinders 24 and the associated aluminum annular closures 25 which are supported by the radially extending arms 26 and the aluminum ring 27.
In operation, cathode and heater potential are supplied by the leads 23 and 29 to the electron gun 15 which projects a beam of electrons along the axis of tne casing 10. The beam of electrons is accelerated and focused by the anode 17 and focusing coil 23 before being collected by the collector 13. Radio frequency energy to be amplified is coupled to the slow-wave helix 11 by input terminal 31 and associated coaxial lead-in 32. The amplified radio frequency energy is taken from the slowwave helix 11 at output terminal 33 and associated coaxial lead-out 34 after having exchanged energy with the electron beam all along the slow-wave helix.
A. portion of the novel slow-wave helix 11 in FIG. 1 is more clearly shown in FIG. 2. Notches 39 are placed at uniform intervals along one side of the tape helix 11 and the notches 46* are placed at uniform intervals along the other side of helix 1]. so as to form discrete areas of non-uniform cross section.
The areas of reduced cross section formed by the notches 39 and 4d are staggered so that a notch 39 in one turn of the helix 11 will be directly opposite a notch 40 on a successive turn forming enlarged openings 41 between successive turns of the helix 11. The spacing between the openings 41 is selected so as to provide perturbations in the characteristic impedance of the helix 11 every one-half wavelength of the backward wave oscillation frequency. Such a spacing will exist if the successive openings 41 lie along the path having the form of a spiral whose pitch is determined by where P is the pitch of the spiral formed by the opening 41;, P is the pitch of the slow-wave helix 11, f is the frequency at which the slow-wave propagates one-half wavelength per turn of helix, and f is the desired stop band center frequency.
The non-uniformities in the characteristic impedance of the helix 11 resulting from notches 39 and 40 cause a certain amount of reflection of energy back toward the source from the point at which irregularity occurs. Where these reflections occur at uniform intervals of onehalf wavelength they become cumulative, the reflected waves reinforce, and the repeating structure becomes a band elimination filter. The result is an attenuation of waves at or closely adjacent to the half wavelength frequency. At frequencies materially different from the center of the stop band, the reflections are not cumulative and the attenuation falls off very rapidly. With the structure here disclosed the number of perturbations is very large so that even a small attenuation per section will have a cumulative result large enough to produce an effective stop band. The width of the stop band produced is related to both width and depth of the notches 39 and 40. Therefore, the width of stop band desired will be one factor in determining the dimensions of the notches. Certain mechanical and physical limitations must also be considered, however. The depth of the notches 39 and 40 must not be so great as to unduly weaken the tape helix 11, for example. Also, as the width of the notches 39 and 4% becomes greater than the width of the ridges 42, then the ridges 42 will replace the notches in forming the non-uniform portions along the helix. In this case, the areas of increased cross section formed by the ridges 42 would accomplish the same result as was formerly done by the notches 39 and 40.
PEG. 3 shows a diagram in which wave velocity (V/c) is plotted along the vertical axis and Ka is plotted along the horizontal axis where Ka is a normalized parameter proportional to frequency and numerically equal to the number of wavelengths per turn. Line 43 represents the forward wave velocity and line 44 represents the backward wave velocity for a particular helix. A forward wave amplifier operating with the electron velocity synchronous to the nondispersive forward wave velocity of a helix will produce backward wave oscillation at the frequency represented by the dotted line 45. This is normally a frequency at which Ka equals 0.5. A spiral path formed by the openings 41 which would produce a stop band for this frequency would have an infinite pitch. Such a stop band could be easily produced by a once per turn notch causing the openings 41 to form a straight line on the surface of the helix 11. However, a traveling wave power tube is nearly always operated at a different beam velocity than that represented by fiat portion of the forward wave curve 43, because of dispersion, space charge, and large signal effects. For example, a traveling wave tube operated at a beam velocity (Ve/c) represented by the dotted line 4-6 will produce backward wave oscillation at a frequency (F rep resented by the dotted line 47. A stop band at this frequency would require that the openings 41 form a spiral having a pitch opposite to that of the helix 11 similar to that h wn in FI 1. On the other hand, operation of the tube at a beam velocity less than that represented by the fiat portion of the forward wave curve 43 would result in backward wave oscillations at a frequency having Ka less than 0.5. This would require that the openings 41 be placed so as to form a spiral having a pitch in the same direction as the helix 11. In any case, the type of notch arrangement shown in FIG. 1 may be designed to produce a desired stop band in a traveling wave amplifier tube without interfering with the interior structure of the traveling wave tube or substantially affecting the forward wave characteristic impedance of its slowwave helix.
Many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof. For example only, the tape helix shown in the drawings could be replaced by a wire helix, the notches forming non-uniformities could be replaced by ridges, etc. It is, therefore, intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
What is claimed is:
v 1. In a traveling wave amplifier device wherein energy is exchanged between an electron beam and the field of a radio frequency wave, apparatus for propagating the radio frequency wave comprising a slow-wave helical conductor, said slow-wave helical conductor having discrete areas of non-uniform cross section at uniform intervals along the helical conductor to provide a stop band for backward wave oscillations, and wherein each of said discrete areas of non-uniform cross section lie along a path having the form of a spiral, and the pitch of said spiral is different than the pitch of said slow-wave helical conductor.
' 2. A traveling wave amplifier device as defined in claim 1 wherein the pitch of said spiral is substantially equal to 7,,P /f f, where P is the pitch of said slow-wave helical conductor, f is the frequency at which the slow wave propagates one-half wavelength per turn of helical conductor, and f is the center frequency of said stop band for backward wave oscillations.
3. A traveling wave amplifier device as defined in claim 1 wherein said discrete areas of non-uniform cross section are formed by areas of reduced cross section of said conductor.
4. A traveling wave amplifier device as defined in claim 3, wherein the spacing between said discrete areas of reduced cross section is substantially equal to one-half wavelength of the backward wave oscillation frequency.
5. A traveling wave amplifier device as defined in claim 1 wherein said discrete areas of non-uniform cross section are formed by areas of increased cross section of said conductor.
6. A traveling wave amplifier device as defined in claim 5 wherein thespacing between said discrete areas of increased cross section is substantially equal to one-half wavelength of the backward wave oscillation frequency.
7. In a traveling wave amplifier device wherein energy is exchanged between an electron beam and the field of a radio frequency wave, apparatus for propagating the radio frequency wave comprising a slow-wave helical conductor, said slow-wave helical conductor having discrete areas of non-uniform cross section at uniform intervals along the helical conductor to provide a stop band for backward wave oscillations, the spacing be tween said discrete areas of non-uniform cross section being substantially equal to one-half wave length of the backward wave oscillation frequency.
8. A traveling wave amplifier device as claimed in claim 7 wherein each of said discrete areas of non-uniform cross section lie along a path having the form of a spiral, and the pitch of said spiral is different than the pitch of said slow-wave helical conductor.
9. A traveling Wave amplifier device as claimed in claim 8 wherein the pitch of said spiral is substantially equal to f P /f f where P is the pitch of said slow- Wave helical conductor, f is the frequency at which the slow-wave propagates one-half Wavelength per turn of helical conductor, and i is the center frequency of said stop band for backward Wave oscillations.
10. A traveling wave amplifier device as claimed in claim 7 wherein said discrete areas of non-uniform cross section are formed by areas of reduced cross section of 10 said conductor.
References Cited by the Examiner 3/41 Llewellyn 315 -3.5 X 1 6 Lines 315-35 X Dodds 3153.6
Johnson et a1 315--3.6
Poulter 315-3.5
Dodds et al. 3l53.6
Warnecke et a1. 3153.5
Webber 315-35 Lagerstrom et a1 3153.6 Wilmarth 3153.6
GEORGE N. WESTBY, Primary Examiner.
RALPH G. NILSON, Examiner.
Claims (1)
- 7. IN A TRAVELING WAVE AMPLIFIER DEVICE WHEREIN ENERGY IS EXCHANGED BETWEEN AN ELECTRON BEAM AND THE FIELD OF A RADIO FREQUENCY WAVE, APPARATUS FOR PROPAGATING THE RADIO FREQUENCY WAVE COMPRISING A SLOW-WAVE HELICAL CONDUCTOR, SAID SLOW-WAVE HELICAL CONDUCTOR HAVING DISCRETE AREAS OF NON-UNIFORM CROSS SECTION AT UNIFORM INTERVALS ALONG THE HELICAL CONDUCTOR TO PROVIDE A STOP BAND FOR BACKWARD WAVE OSCILLATIONS, THE SPACING BETWEEN SAID DISCRETE AREAS OF NON-UNIFORM CROSS SECTION BEING SUBSTANTIALLY EQUAL TO ONE-HALF WAVE LENGTH OF THE BACKWARD WAVE OSCILLATION FREQUENCY.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79893A US3200286A (en) | 1960-12-30 | 1960-12-30 | Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations |
| GB46046/61A GB970424A (en) | 1960-12-30 | 1961-12-22 | Travelling wave amplifier tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79893A US3200286A (en) | 1960-12-30 | 1960-12-30 | Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3200286A true US3200286A (en) | 1965-08-10 |
Family
ID=22153477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US79893A Expired - Lifetime US3200286A (en) | 1960-12-30 | 1960-12-30 | Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3200286A (en) |
| GB (1) | GB970424A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3324199A (en) * | 1964-06-26 | 1967-06-06 | Du Pont | Linear polymeric ketones containing a multiplicity of hydroxy arylene groups |
| US3389291A (en) * | 1965-04-30 | 1968-06-18 | Varian Associates | Oscillation suppression means for high frequency electron discharge devices incorporating traveling wave tube portions |
| US3397339A (en) * | 1965-04-30 | 1968-08-13 | Varian Associates | Band edge oscillation suppression techniques for high frequency electron discharge devices incorporating slow wave circuits |
| US3538377A (en) * | 1968-04-22 | 1970-11-03 | Varian Associates | Traveling wave amplifier having an upstream wave reflective gain control element |
| 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 |
| US4185225A (en) * | 1978-03-24 | 1980-01-22 | Northrop Corporation | Traveling wave tube |
| CN108428608A (en) * | 2018-04-08 | 2018-08-21 | 电子科技大学 | A kind of angle logarithm complications slow wave line slow-wave structure of vane loaded being angularly clamped |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE21739E (en) * | 1941-03-04 | Space discharge apfarathjs | ||
| US2641731A (en) * | 1947-10-06 | 1953-06-09 | English Electric Valve Co Ltd | Wave propagating electron discharge device |
| US2773213A (en) * | 1951-03-13 | 1956-12-04 | Rca Corp | Electron beam tubes |
| US2809321A (en) * | 1953-12-30 | 1957-10-08 | Hughes Aircraft Co | Traveling-wave tube |
| US2822501A (en) * | 1955-01-10 | 1958-02-04 | Research Corp | Slow-wave guide for traveling wave tubes |
| US2828440A (en) * | 1950-06-22 | 1958-03-25 | Rca Corp | Traveling wave electron tube |
| US2888595A (en) * | 1951-03-15 | 1959-05-26 | Csf | Travelling wave delay tubes of the magnetron type |
| US2941112A (en) * | 1955-07-25 | 1960-06-14 | Gen Electric | Electric discharge device |
| US2967259A (en) * | 1959-07-23 | 1961-01-03 | Richard P Lagerstrom | Resistance-strapped helix for a traveling wave tube |
| US3121819A (en) * | 1959-12-30 | 1964-02-18 | Itt | Arrangement for reducing high voltage breakdown between helical windings in traveling wave tubes |
-
1960
- 1960-12-30 US US79893A patent/US3200286A/en not_active Expired - Lifetime
-
1961
- 1961-12-22 GB GB46046/61A patent/GB970424A/en not_active Expired
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE21739E (en) * | 1941-03-04 | Space discharge apfarathjs | ||
| US2641731A (en) * | 1947-10-06 | 1953-06-09 | English Electric Valve Co Ltd | Wave propagating electron discharge device |
| US2828440A (en) * | 1950-06-22 | 1958-03-25 | Rca Corp | Traveling wave electron tube |
| US2773213A (en) * | 1951-03-13 | 1956-12-04 | Rca Corp | Electron beam tubes |
| US2888595A (en) * | 1951-03-15 | 1959-05-26 | Csf | Travelling wave delay tubes of the magnetron type |
| US2809321A (en) * | 1953-12-30 | 1957-10-08 | Hughes Aircraft Co | Traveling-wave tube |
| US2822501A (en) * | 1955-01-10 | 1958-02-04 | Research Corp | Slow-wave guide for traveling wave tubes |
| US2941112A (en) * | 1955-07-25 | 1960-06-14 | Gen Electric | Electric discharge device |
| US2967259A (en) * | 1959-07-23 | 1961-01-03 | Richard P Lagerstrom | Resistance-strapped helix for a traveling wave tube |
| US3121819A (en) * | 1959-12-30 | 1964-02-18 | Itt | Arrangement for reducing high voltage breakdown between helical windings in traveling wave tubes |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3324199A (en) * | 1964-06-26 | 1967-06-06 | Du Pont | Linear polymeric ketones containing a multiplicity of hydroxy arylene groups |
| US3389291A (en) * | 1965-04-30 | 1968-06-18 | Varian Associates | Oscillation suppression means for high frequency electron discharge devices incorporating traveling wave tube portions |
| US3397339A (en) * | 1965-04-30 | 1968-08-13 | Varian Associates | Band edge oscillation suppression techniques for high frequency electron discharge devices incorporating slow wave circuits |
| US3538377A (en) * | 1968-04-22 | 1970-11-03 | Varian Associates | Traveling wave amplifier having an upstream wave reflective gain control element |
| 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 |
| US4185225A (en) * | 1978-03-24 | 1980-01-22 | Northrop Corporation | Traveling wave tube |
| CN108428608A (en) * | 2018-04-08 | 2018-08-21 | 电子科技大学 | A kind of angle logarithm complications slow wave line slow-wave structure of vane loaded being angularly clamped |
Also Published As
| Publication number | Publication date |
|---|---|
| GB970424A (en) | 1964-09-23 |
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