US3602766A - Traveling-wave tube having auxiliary resonant cavities containing lossy bodies which protrude into the slow-wave structure interaction cells to provide combined frequency sensitive and directionally sensitive attenuation - Google Patents

Traveling-wave tube having auxiliary resonant cavities containing lossy bodies which protrude into the slow-wave structure interaction cells to provide combined frequency sensitive and directionally sensitive attenuation Download PDF

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US3602766A
US3602766A US798646A US3602766DA US3602766A US 3602766 A US3602766 A US 3602766A US 798646 A US798646 A US 798646A US 3602766D A US3602766D A US 3602766DA US 3602766 A US3602766 A US 3602766A
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traveling
wave
distance
interaction
bodies
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Jeffrey E Grant
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Raytheon Co
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Hughes Aircraft Co
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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

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  • auxiliary cavities which are resonant at a frequency in the vicinity of a cutoff frequency of the slow-wave structure communicate with respective slow-wave structure interaction cells.
  • Lossy ceramic bodies disposed in respective auxiliary cavities protrude into the adjacent slow-wave structure interaction cells to simultaneously provide both frequency sensitive and directionally sensitive attenuation.
  • the distance of protrusion is essentially uniform for the respective lossy bodies.
  • the distance of protrusion of successive lossy bodies in an amplifying section is progressively decreased as a function of longitudinal distance from the sever in order to additionally function to terminate the amplifying section.
  • This invention relates generally to microwave devices, and it more particularly relates to traveling-wave tubes having means for simultaneously providing both frequency sensitive attenuation and directionally sensitive attenuation in order to increase tube stability.
  • the invention also provides, for traveling-wave tubes of the type which are severed into a plurality of amplifying sections, a combined frequency sensitive loss introducing and amplifying section terminating arrangement.
  • a stream of electrons is caused to interact with a propagating electromagnetic wave in a manner which amplifies the electromagnetic energy.
  • the electromagnetic wave is propagated along a slow-wave structure, such as a conductive helix wound about the path of the electron stream or a folded waveguide type of structure in which a waveguide is effectively wound back and forth across the path of the electrons.
  • the slow-wave structure provides a path of propagation for the electromagnetic wave which is considerably longer than the axial length of the structure, and hence, the traveling-wave may be made to effectively propagate at nearly the velocity of the electron stream.
  • the interactions between the electrons in the stream and the traveling-wave cause velocity modulations and bunching of the electrons in the stream. The net result may then be a transfer of energy from the electron beam to the wave traveling along the slow-wave structure.
  • the present invention is concerned with traveling-wave tubes utilizing slow-wave structures of the coupled cavity, or interconnected cell, type. ln this type of slow-wave structure a series of interaction cells, or cavities, are disposed adjacent to each other sequentially along the axis of the tube. The electron stream passes through each interaction cell, and electromagnetic coupling is provided between each cell and the electron stream. Each interaction cell is also coupled to an adjacent cell by means of a coupling hole at the end wall defining the cell. Generally, the coupling holes between adjacent cells are alternately disposed on opposite sides of the axis of the tube, although various other arrangements for staggering the coupling holes are possible and have been employed.
  • traveling-wave tubes are designed for operation at higher and higher power levels, in order to ensure stability such tubes have been constructed in several amplifying sections, with a substantially complete sever or electromagnetic circuit wave isolation provided between adjacent amplifying sections, and the only coupling between the sections occurring by means of the velocity modulated electron stream. Since each amplifying section has a length appropriate for maximum stable gain, it is necessary to effectively terminate each section with a matched load. In the past such termination has been achieved by providing separate terminating elements either internally of the slow-wave structure, externally of the slow-wave structure, or in hybrid fashion both internally and externally of the slowwave structure. For further details as to these terminations reference may be made to U.S. Pat. No.
  • lt is yet another object of the present invention to provide a severed traveling-wave tube which provides an improved match at the severed ends of the amplifying sections, thereby reducing undesired small signal gain variations as a function of frequency.
  • a traveling-wave tube includes means for providing a stream of electrons along a predetermined path and a slow-wave structure having a plurality of intercoupled interaction cells disposed sequentially along and about the electron stream path for propagating electromagnetic wave energy in such manner that it interacts with the stream of electrons.
  • a plurality of cavities are respectively disposed externally of at least selected ones of the interaction cells and sequentially along a direction parallel to the electron stream path. Each cavity communicates with one of the interaction cells and is resonant at a preselected frequency.
  • a body of lossy material is disposed in each cavity and protrudes into the adjacent interaction cell by a preselected distance.
  • the distance of protrusion is essentially the same for each lossy body.
  • the cavity resonances and the portions of the lossy bodies within the cavities provide frequency sensitive attenuation, while the protruding portions of the lossy bodies introduce directionally sensitive attenuation to the electromagnetic wave propagating along the slow-wave structure.
  • the traveling-wave tube is severed into a plurality of amplifying sections.
  • the distance of protrusion of successive ones of the lossy bodies in at least one of the amplifying sections is progressively decreased as a function of longitudinal distance from the severed end of this amplifying section.
  • the cavity resonances and the portions of the lossy bodies within the cavities introduce frequency sensitive attenuation, while the progressively varying protrusion of the lossy bodies provides tapered attenuation which terminates the slow-wave structure amplifying section.
  • FIG. I is an overall view, partly in longitudinal section and partly broken away, of a single-section traveling-wave tube constructed in accordance with one embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1;
  • FIG. 3 is a longitudinal sectional view taken along line 3-3 of FIG. 2;
  • FIG. 4 is a longitudinal sectional view taken along line 4-4 of FIG. 2',
  • FIG. 5 is an overall view, partly in longitudinal section and partly broken away, of a severed traveling-wave tube constructed in accordance with another embodiment of the present invention.
  • FIG. 6 is a perspective view of a portion of the slow-wave structure, including the combined frequency sensitive loss introducing and section terminating arrangement of the invention, for the traveling-wave tube of FIG. 5.
  • the reference numeral I0 designates generally a travelingwave tube which includes an arrangement 12 of magnets, pole pieces and spacer elements which will be described in detail later.
  • the spacer elements and interior portions of the pole pieces function as a slow-wave structure, while the magnets and pole pieces can stitute a periodic focusing device for the electron beam traversing the length of the slow-wave structure.
  • an input waveguide transducer 14 which includes an impedance step transformer I6.
  • a flange 18 is provided for coupling the as Sild traveling-wave tube to an external waveguide or other microwave transmission line (not shown).
  • the construction of the flange l8 may include a microwave window (not shown) transparent to microwave energy but capable of maintaining a vacuum within the traveling-wave tube 10.
  • an output transducer 20 is provided which is substantially similar to the input transducer 14 and which includes an impedance step transformer 22 and a coupling flange 24, which elements are similar to the elements l6 and I8, respectively, of the input transducer I4.
  • a double-ended pumping tube 26 is connected to both of the input and output waveguide transducers l4 and 20.
  • An electron gun 28 is disposed at one end of the travelingwave tube 10 which, although illustrated as the input end in NO. I, may alternatively be the output end if a backward wave device is desired.
  • the electron gun 28 functions to project a stream of electrons along the axis of the tube 10 and may be of any conventional construction well known in the art.
  • For details as to the construction of the gun 28 reference is made to the aforementioned U.S. Pat. No. 2,985,791 and to U.S. Pat. No. 2,936,393, entitled, "Low Noise Traveling- Wave Tube, issued May I0, 1960, to M. R. Currie et al. and also assigned to the assignee of the present invention.
  • a cooled collector structure 30 for collecting the electrons in the stream.
  • the collector is conventional and may be of any fonn well known in the art.
  • For details as to the construction of the collector reference is made to the aforesaid U.S. Pat. No. 2,985,791 and to U.S. Pat. No. 2,860,277, entitled, Traveling-Wave Tube Collector Electrode, issued Nov. l l, P 8, to A. H. lversen and assigned to the assignee of the present invention.
  • FIGS. 2-4 The construction of the slow-wave structure and magnetic focusing system for the traveling-wave tube 10 are illustrated in more detail in FIGS. 2-4.
  • a plurality of essentially annular disk-shaped focusing magnets 32 are interposed between a plurality of ferromagnetic pole pieces, or plates, 34.
  • the magnets 32 may be diametrically split into two sections 320 and 32b for convenience during assembly of the tube.
  • the ferromagnetic pole pieces 34 extend radially inwardly of the magnets 32 to approximately the perimeter of the region adapted to contain the axial electron stream.
  • the individual pole pieces are constructed in such a manner that a short drift tube, or ferrule, 36 is provided at the inner extremity of each pole piece.
  • the drift tube 36 is in the form of a cylindrical extension, or lip, protruding axially along the path of the electron stream from both surfaces of pole piece 34, Le, in both directions normal to the plane of the pole piece 34.
  • the drift tubes 36 are provided with central and axially aligned apertures 38 to provide a passage for the flow of the electron beam. Adjacent ones of the drift tubes 36 are separated by a gap 40 which functions as a magnetic gap to provide a focusing lens for the electron beam and also as an interaction gap in which energy exchange between the electron beam and traveling-wave energy traversing the slow-wave structure occurs.
  • each spacer element 42 Disposed radially within each of the magnets 32 is a slowwave circuit spacer element 42 of a conductive nonmagnetic material such as copper.
  • Each spacer element 42 has an annular portion of an outer diameter essentially equal to the inner diameter of the magnets 32 and a pair of oppositely disposed ear portions 43 and 44 projecting outwardly from the annular portion.
  • Each spacer element also defines a central cylindrical aperture 45 to provide space for a microwave interaction cell, or cavity, 46 which is defined by the inner lateral surface of the spacer 42 and the walls of the two adjacent pole pieces 34 projecting inwardly of the spacer element 42.
  • the inner diameter of the spacer 42 determines the radial extent of the interaction cell 46, while the axial length of the spacer 42 determines the axial length of the cell 46.
  • an offcenter coupling hole 48 is provided through each of the pole pieces 34 to permit the transfer of electromagnetic wave energy from cell to cell.
  • the coupling holes 48 may be substantially kidney-shaped and may be alternately disposed apart with respect to the drift tubes 36. It should be pointed out, however, that the coupling holes 48 may be of other shapes and may be staggered in various other arrangements, such as those disclosed in U.S. Pat. No. 3,010,047, entitled Traveling-Wave Tube,” issued Nov. 2i, I961 to D. .l. Bates and assigned to the assignee of the present invention.
  • the spacer elements 42 and the portions of the pole pieces 34 projecting inwardly of the spacers 42 not only form an envelope for the tube, but also constitute a slow-wave structure for propagating travelingwave energy in a serpentine path along the axially traveling electron stream so as to support energy exchange between the electrons of the stream and the traveling-wave.
  • the axial length of the magnets 32 is equal to the spacing between adjacent pole pieces 34, and the radial extent of the magnets 32 is approximately equal to or, as shown, slightly greater than that of the pole pieces 34.
  • the magnets 32 are stacked with alternating polarity along the axis of the tube, thus causing a reversal of the magnetic field at each magnetic lens and thereby providing a periodic focusing device.
  • the lengths of the spacers 42 may be substantially constant, they may also be varied slightly with respect to each other so that the effective axial length of the cavities 46 is varied as a function of distance along the tube to ensure that the desired interaction between the electron stream and the traveling waves will continue to a maximum degree even though the electrons are decelerated toward the collector end of tube.
  • a slow-wave structure spacer element 42 may define a pair of cylindrical cavities 50 and 52 which are respectively disposed in the projecting ear portions 43 and 4-4 of the spacer element 42 and have their longitudinal axes disposed parallel to the longitudinal axis of the traveling-wave tube I2.
  • the cavities and 52 have a length equal to the thickness of the slow-wave structure spacer element 42 and are designed to resonate at a frequency at which loss is to be introduced into the circuit.
  • the cavity resonant frequency is preferably at or near either the upper or lower cutoff frequency of the slow-wave structure, it is to be understood that the resonant loss frequency may be any preselected frequency.
  • Cylindrical buttonlike bodies 54 and 56 of a mixture of ceramic and lossy materials are disposed in and substantially fill the respective cavities 50 and 52 in order to provide the desired loss.
  • the resonant cavities 50 and 52 and the lossy bodies 54 and 56 reference may be made to the aforementioned US. Pat. No. 3,221,204.
  • the lossy bodies 54 and 56 protrude into the adjacent interaction cell 46 by a preselected distance d.
  • the distance of protrusion d is preferably between percent and 30 percent of the distance from the edge of the interaction cell 46 to the center of the stream of electrons, ie the radius r of the interaction cell.
  • the traveling-wave tube has a single amplifying section, and the distance of protrusion d of each of the lossy bodies 54 (or 56) is essentially the same.
  • essentially uniform distributed attenuation is introduced to the slow-wave structure.
  • This distributed loss attenuates electromagnetic waves traversing the slow-wave structure in the backward direction, i.e. from the collector 30 toward the electron gun 28, by two to three times more than it attenuates electromagnetic waves traveling in the forward direction, i.e. from the electron gun 28 toward the collector 30.
  • the resonant cavities 50 and 52 and the protmding lossy bodies 54 and 56 function to provide both frequency sensitive attenuation at the cavity resonant frequency and directionally sensitive attenuation in favor of forwardly traveling electromagnetic waves, thereby increasing the stability of the tube.
  • the traveling-wave tube is severed into a plurality of amplifying sections. Since the traveling-wave tube of FIGS. 5 and 6 is very similar to that of FIGS. 14, components in the embodiment of FIGS. 5-6 which are the same as corresponding components in the embodiment of FIGS. I4 are designated by the same second and third reference numeral digits as their corresponding components in FIGS. 1-4 but with the addition of the prefix numeral l.”
  • the traveling-wave tube I10 is illustrated as having three amplifying sections 162, 164 and 166, although it is understood that three such sections are shown solely for illustrative purposes.
  • Each of the amplifying sections is isolated from the adjacent section or sections by means of an isolator device.
  • the first and second amplifying sections 162 and 164, respectively are isolated from each other by isolator device I68; while the second and third amplifying sections I64 and 166, respectively, are isolated from one another by means of isolator device 170.
  • the isolator devices 168 and I70 provide a substantially complete sever between adjacent amplifying sections of the traveling-wave tube IIO for electromagnetic waves traveling along the slow-wave structure, and which waves are hereinafter referred to as electromagnetic circuit waves.
  • the electron stream is allowed to pass through the entire length of the traveling-wave tube 110.
  • the electron stream is modulated in each amplifying section, and hence, as it enters the subsequent amplifying section it launches a new electromagnetic circuit wave therein which is amplified by interaction between the new electromagnetic circuit wave and the electron stream.
  • unidirectional coupling adjacent amplifying sections is provided by means of the electron stream.
  • FIG. 5 is broken away in the region of isolator device 170 in order to illustrate the interior construction thereof, it being understood that isolator device I68 is constructed in an identical manner.
  • Isolator device 170 comprises a modified pole piece, or plate, 134 which differs from the remaining pole pieces 134 in that no coupling hold for electromagnetic circuit waves is provided in the pole piece I34. This prevents electromagnetic circuit waves in amplifying section 164 from passing into the section 166, and vice versa, thereby achieving electromagnetic circuit wave isolation between the sections 164 and 166.
  • the interior portion of slow-wave structure amplifying section 164 adjacent isolator device I70 is illustrated in FIG. 6. It may be seen that the distance of protrusion of successive lossy bodies 1540, 154b, I54c and 154d (also 1560, 156b, l56c and 156d) disposed in respective spacer elements 142a, I42b, I42c and 146d into respective interaction cells 146a, I46b, l46c and 146d decreases as a function of longitudinal distance from the isolator pole piece 134.
  • the distance of protrusion can be varied by varying the radial location of successive lossy bodies with respect to the tube axis. However, in a preferred arrangement, illustrated in FIG.
  • lossy bodies I54b, 154a and 154d define respective flat, or planar, lateral surfaces b, ISSc and I55d (I57b, 157C and 157d) facing the stream of electrons in respective planes perpendicular to the plane passing through the longitudinal axes of the lossy bodies and the electron stream path.
  • the distance between the respective planes of the surfaces 155b, 1556 and 155d (also 157b, l57c and 157d) and the outer edge of the respective interaction cells 146b, 1460 and 146d is progressively decreased as a function of longitudinal distance from the isolator pole piece I34.
  • the distance of protrusion d of the successive lossy bodies is decreased essentially linearly as a function of longitudinal distance from the isolator pole piece 134', although it should be understood that other relationships are possible and may be employed.
  • the arrangement of FIG. 6 provides progressively increasing attenuation as a function of distance toward isolator pole piece 134'.
  • the end of the amplifying section I64 adjacent the isolator pole piece I34 is effectively terminated with minimum reflection of electromagnetic circuit wave energy back toward the electron gun 128.
  • undesired small signal gain variations as a function of frequency are minimized.
  • a severed traveling-wave tube according to the present invention requires fewer parts and is more compact than prior art severed tubes with comparable power handling capabilities.
  • a severed traveling-wave tube according to the invention is able to handle more RF power than comparably dimensioned severed traveling-wave tubes according to the prior art.
  • the arrangement illustrated in FIG. 6 is designed to provide a termination for forwardly traveling electromagnetic circuit waves in amplifying section 164.
  • the same arrangement may be employed at the end of amplifying section 162 adjacent isolator device 168 to provide a termination for forwardly traveling electromagnetic circuit waves in the section 162.
  • a similar arrangement can be sued in each of the sections 162, 164 and 166 to provide a termination for backwardly traveling electromagnetic circuit waves.
  • the distance of protrusion of successive lossy bodies would be decreased as a function of distance from the ends of the respective amplifying sections nearest the electron gun l28 in a direction toward the collector 130.
  • the lossy body protrusion would be the greatest at both ends and smallest at the longitudinal centers of these amplifying sections.
  • a traveling-wave tube comprising: means for providing a stream of electrons along a predetermined path, slow-wave structure means defining a plurality of intercoupled interaction cells disposed sequentially along and about said predetermined path for propagating electromagnetic wave energy in such manner that it interacts with said stream of electrons, means defining a plurality of cavities respectively disposed externally of at least selected ones of said interaction cells and sequentially along a direction parallel to said predetermined path, each of said cavities communicating with one of said interaction cells and being resonant at a preselected frequency, and a body of lossy material disposed in each said cavity and protruding into the adjacent one of said interaction cells by a preselected distance.
  • a traveling-wave tube according to claim 1 wherein said preselected distance of protrusion is between essentially 5 percent and essentially 30 percent of the distance from the edge of said interaction cell to the center of said stream of electrons.
  • a traveling-wave tube according to claim 1 wherein said preselected distance of protrusion is essentially the same for each of said bodies.
  • a traveling-wave tube comprising: means for providing a stream of electrons along a predetermined path, a plurality of axially aligned essentially annular electrically conductive spacer elements sequentially disposed along and encompassing said predetermined path, a plurality of electrically conductive plates each mounted between a pair of adjacent spacer elements to define in conjunction with said spacer elements a plurality of interaction cells, said plates defining aligned apertures in their central regions to provide a passage for said electron stream and further defining coupling holes in regions radially outwardly of said central regions for interconnecting adjacent interaction cells whereby a propagation path is provided for an electromagnetic wave in a manner to provide interaction between said electron stream and said electromagnetic wave, at least certain ones of said spacer elements each defining a cavity disposed externally of and communicating with the interaction cell defined by the said spacer element, each of said cavities being resonant at a preselected frequency, and a body of lossy material disposed in each said cavity and protruding into the adjacent interaction cell by a pres
  • each said cavity and each said body is of essentially cylindrical shape and has its longitudinal axis disposed parallel to said preselected path.
  • a traveling-wave tube according to claim 5 wherein said preselected distance of protrusion is between essentially 5 percent and essentially 30 percent of the radius of said interaction cell.
  • a traveling-wave tube according to claim 5 wherein said preselected distance of protrusion is essentially the same for each said body.
  • a traveling-wave tube of the type which is severed into a plurality of amplifying sections, each isolated from one another with respect to electromagnetic circuit wave energy comprising: means for providing a stream of electrons along a predetermined path, slow-wave structure means extending through each of said amplifying sections and defining a plurality of intercoupled interaction cells disposed sequentially along and about said predetermined path for propagating elec tromagnetic circuit wave energy in such manner that it interacts with said stream of electrons, means disposed between each pair of adjacent amplifying sections for precluding the passage of electromagnetic circuit wave energy between said adjacent amplifying sections while permitting the passage of said stream of electrons therebetween, means defining a plurality of cavities respectively disposed externally of at least selected ones of said interaction cells and sequentially along a direction parallel to said predetermined path, each of said cavities communicating with one of said interaction cells and being resonant at a preselected frequency, and a body of lossy material disposed in each said cavity and protruding into the adjacent one of said interaction
  • a traveling-wave tube according to claim 9 wherein the distance of protrusion of successive ones of said bodies in said one amplifying section decreases essentially linearly as a function of longitudinal distance from said end of said amplifying section.
  • a traveling-wave tube according to claim ll wherein at least selected ones of said bodies in said one amplifying section each define a planar lateral surface facing said stream of electrons and in a plane essentially perpendicular to the plane passing through the longitudinal axes of the said body and said predetermined path, the distance between the plane of said surface and the edge of the interaction cell into which the said body protrudes progressively decreasing as a function of longitudinal distance from the end of said one amplifying section adjacent said precluding means.
  • a traveling-wave tube comprising: means for providing a stream of electrons along a predetermined path; a wave propagating structure divided into at least first and second amplifying sections and disposed along and about said predetermined path, each of said sections including a plurality of axially aligned essentially annular electrically conductive spacer elements sequentially disposed along and encompassing said predetermined path, a plurality of electrically conductive plates each mounted between a pair of adjacent spacer elements to define in conjunction with said spacer elements a plurality of interaction cells, said plates defining aligned apertures in their central regions to provide a passage for said electron stream and further defining coupling holes in regions radially outwardly of said central regions for interconnecting adjacent interaction cells whereby a propagation path is provided for an electromagnetic circuit wave in a manner to provide interaction between said electron stream and said electromagnetic circuit wave; an isolator electrically conductive plate similar to the plates of said plurality but not defining any electromagnetic circuit wave coupling hole disposed between said first and second amplifying sections and axially align
  • a traveling-wave tube according to claim l5 wherein at least selected ones of said bodies in said one amplifying section each define a planar lateral surface facing said stream of electrons and in a plane essentially perpendicular to the plane passing through the longitudinal axes of the said body and said predetermined path, the distance between the plane of said surface and the edge of the interaction cell into the said body protrudes progressively decreasing as a function of longitudinal distance from said isolator plate.

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US798646A 1969-02-12 1969-02-12 Traveling-wave tube having auxiliary resonant cavities containing lossy bodies which protrude into the slow-wave structure interaction cells to provide combined frequency sensitive and directionally sensitive attenuation Expired - Lifetime US3602766A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876902A (en) * 1973-01-04 1975-04-08 Siemens Ag Damped delay line for travelling-wave tubes
US3889148A (en) * 1972-10-23 1975-06-10 Franz Gross Transit time amplifier tube having an attenuated delay line
US3889149A (en) * 1973-10-24 1975-06-10 Us Navy Liquid cooled attenuator
US3924151A (en) * 1973-09-19 1975-12-02 Siemens Ag Delay line with low reflection attenuation for transit-time tubes
US4001630A (en) * 1973-05-21 1977-01-04 Siemens Aktiengesellschaft Selectively damped travelling wave tube
US4013917A (en) * 1974-12-03 1977-03-22 Nippon Electric Company, Ltd. Coupled cavity type slow-wave structure for use in travelling-wave tube
US4041349A (en) * 1973-02-16 1977-08-09 English Electric Valve Company Limited Travelling wave tubes
US4057748A (en) * 1975-03-08 1977-11-08 English Electric Valve Company Ltd. Travelling wave tubes
US4066927A (en) * 1975-06-10 1978-01-03 Siemens Aktiengesellschaft Wide-band low-reflection attenuated delay line
US4147956A (en) * 1976-03-16 1979-04-03 Nippon Electric Co., Ltd. Wide-band coupled-cavity type traveling-wave tube
US4147955A (en) * 1976-04-13 1979-04-03 English Electric Valve Company Limited Travelling wave tubes
US4307322A (en) * 1979-08-06 1981-12-22 Litton Systems, Inc. Coupled cavity traveling wave tube having improved loss stabilization
US4709186A (en) * 1984-09-18 1987-11-24 English Electric Valve Company Limited Coupled cavity travelling wave tubes
US4871950A (en) * 1986-12-19 1989-10-03 Thomson-Csf Wide band device for coupling between the delay line of a travelling wave tube and the external circuit transmitting the energy of the tube
US5477107A (en) * 1993-12-21 1995-12-19 Hughes Aircraft Company Linear-beam cavity circuits with non-resonant RF loss slabs

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889148A (en) * 1972-10-23 1975-06-10 Franz Gross Transit time amplifier tube having an attenuated delay line
US3876902A (en) * 1973-01-04 1975-04-08 Siemens Ag Damped delay line for travelling-wave tubes
US4041349A (en) * 1973-02-16 1977-08-09 English Electric Valve Company Limited Travelling wave tubes
US4001630A (en) * 1973-05-21 1977-01-04 Siemens Aktiengesellschaft Selectively damped travelling wave tube
US3924151A (en) * 1973-09-19 1975-12-02 Siemens Ag Delay line with low reflection attenuation for transit-time tubes
US3889149A (en) * 1973-10-24 1975-06-10 Us Navy Liquid cooled attenuator
US4013917A (en) * 1974-12-03 1977-03-22 Nippon Electric Company, Ltd. Coupled cavity type slow-wave structure for use in travelling-wave tube
US4057748A (en) * 1975-03-08 1977-11-08 English Electric Valve Company Ltd. Travelling wave tubes
US4066927A (en) * 1975-06-10 1978-01-03 Siemens Aktiengesellschaft Wide-band low-reflection attenuated delay line
US4147956A (en) * 1976-03-16 1979-04-03 Nippon Electric Co., Ltd. Wide-band coupled-cavity type traveling-wave tube
US4147955A (en) * 1976-04-13 1979-04-03 English Electric Valve Company Limited Travelling wave tubes
US4307322A (en) * 1979-08-06 1981-12-22 Litton Systems, Inc. Coupled cavity traveling wave tube having improved loss stabilization
US4709186A (en) * 1984-09-18 1987-11-24 English Electric Valve Company Limited Coupled cavity travelling wave tubes
US4871950A (en) * 1986-12-19 1989-10-03 Thomson-Csf Wide band device for coupling between the delay line of a travelling wave tube and the external circuit transmitting the energy of the tube
US5477107A (en) * 1993-12-21 1995-12-19 Hughes Aircraft Company Linear-beam cavity circuits with non-resonant RF loss slabs

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DE2134996A1 (de) 1973-01-25
DE2134996B2 (de) 1973-06-20
DE2134996C3 (de) 1974-01-24
GB1325856A (en) 1973-08-08

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