Electron beam tube arrangements having the input cavity comprised of electrically internal and external body portions

In a linear electron beam tube having at least means for providing voltages thereto, an electron gun, and an output resonant cavity operatively arranged together, an arrangement comprising:

• an internal body portion;
• an external body portion;
• and
• an insulating portion;
• wherein said internal body portion, external body portion, and insulating portion at least partially define an annular input resonant cavity, said internal body portion is provided with a high voltage, with respect to said external body portion, from said means for providing voltages, and said internal and external body portions are separated by said insulating portion so that said internal and external body portions have no electrically conductive connection therebetween;
• wherein said internal body portion is in electrical contact with the electron gun;
• wherein said annular input resonant cavity at least partially defined by said internal and external body portions surrounds the electron gun;
• wherein said annular input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the internal body portion and part of the external body portion, and said insulating portion comprising a member of insulating material disposed between these body portion parts;
• wherein said annular input resonant cavity comprises a primary resonant cavity;
• wherein the arrangement further comprises a secondary resonant cavity coupled to said primary resonant cavity;
• wherein the secondary resonant cavity has an associated resonant frequency and means for tuning the resonant frequency of said secondary resonant cavity;
• and
• wherein the means for tuning the resonant frequency of said secondary resonant cavity comprises a plunger and a bore associated with the secondary resonant cavity, the plunger being arranged to project from the bore into said secondary resonant cavity so as to vary the volume thereof.

In a linear electron beam tube having at least means for providing voltages thereto, an electron gun, and an output resonant cavity operatively arranged together, an arrangement comprising:

• an internal body portion;
• an external body portion;
• and
• an insulating portion;
• wherein said internal body portion, external body portion, and insulating portion at least partially define an annular input resonant cavity, said internal body portion is provided with a high voltage, with respect to said external body portion, from said means for providing voltages, and said internal and external body portions are separated by said insulating portion so that said internal and external body portions have no electrically conductive connection therebetween;
• wherein said internal body portion is in electrical contact with the electron gun;
• wherein said annular input resonant cavity at least partially defined by said internal and external body portions surrounds the electron gun;
• wherein said annular input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the internal body portion and part of the external body portion, and said insulating portion comprising a member of insulating material disposed between these body portion parts;
• wherein said internal and external body portions are physically held in a fixed relationship by said insulating portion;
• and
• wherein an external electrical connection is provided to said internal body portion through said insulating portion.

In a linear electron beam tube having at least means for providing voltages thereto, an electron gun, and an output resonant cavity operatively arranged together, an arrangement comprising:

• an internal body portion;
• an external body portion;
• and
• an insulating portion;
• wherein said internal body portion, external body portion, and insulating portion at least partially define an annular input resonant cavity, said internal body portion is provided with a high voltage, with respect to said external body portion, from said means for providing voltages, and said internal and external body portions are separated by said insulating portion so that said internal and external body portions have no electrically conductive connection therebetween;
• wherein said internal body portion is in electrical contact with the electron gun;
• wherein said annular input resonant cavity at least partially defined by said internal and external body portions surrounds the electron gun;
• wherein said annular input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the internal body portion and part of the external body portion, and said insulating portion comprising a member of insulating material disposed between these body portion parts;
• wherein said external body portion is provided with a relatively low voltage from said means for providing voltages;
• and
• wherein said external body portion is at a ground potential voltage.

In a linear electron beam tube having at least means for providing voltages thereto, an electron gun, and an output resonant cavity operatively arranged together, an arrangement comprising:

• an internal body portion;
• an external body portion;
• and
• an insulating portion;
• wherein said internal body portion, external body portion, and insulating portion at least partially define an annular input resonant cavity, said internal body portion is provided with a high voltage, with respect to said external body portion, from said means for providing voltages, and said internal and external body portions are separated by said insulating portion so that said internal and external body portions have no electrically conductive connection therebetween;
• wherein said internal body portion is in electrical contact with the electron gun;
• wherein said annular input resonant cavity at least partially defined by said internal and external body portions surrounds the electron gun;
• wherein said annular input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the internal body portion and part of the external body portion, and said insulating portion comprising a member of insulating material disposed between these body portion parts;
• wherein said annular input resonant cavity comprises a primary resonant cavity;
• wherein the arrangement further comprises a secondary resonant cavity coupled to said primary resonant cavity;
• wherein said input resonant cavity is for coupling external r.f. energy into the tube from an external source;
• and
• wherein said internal and external body portions comprise members which extend into said isolation portion and are mutually interleaved at an interleaved area therein, said members having dimensions which provide a very low r.f. impedance path at the interleaved area thereby inhibiting r.f. leakage from said input resonant cavity.

In a linear electron beam tube having at least means for providing voltages thereto, an electron gun, and an output resonant cavity operatively arranged together, an arrangement comprising:

• an internal body portion;
• an external body portion;
• and
• an insulating portion;
• wherein said internal body portion, external body portion, and insulating portion at least partially define an annular input resonant cavity, said internal body portion is provided with a high voltage, with respect to said external body portion, from said means for providing voltages, and said internal and external body portions are separated by said insulating portion so that said internal and external body portions have no electrically conductive connection therebetween;
• wherein said internal body portion is in electrical contact with the electron gun;
• wherein said annular input resonant cavity at least partially defined by said internal and external body portions surrounds the electron gun;
• wherein said annular input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the internal body portion and part of the external body portion, and said insulating portion comprising a member of insulating material disposed between these body portion parts;
• wherein said annular input resonant cavity is for coupling external r.f. energy from an external source into the tube;
• wherein said annular input cavity has a radial direction;
• and
• wherein said internal and external body portions comprise members which extend into said insulating portion and are mutually interleaved at a interleaved area therein, said members having dimensions which provide a very low r.f. impendance path at the interleaved area thereby inhibiting r.f. leakage from said input resonant cavity.

An electron beam tube amplifier arrangement comprising:

• an input section including a centrally disposed electron gun incorporating a cathode and a grid, the input section being surrounded by an annular primary input cavity, the annular primary input cavity being coupled to a secondary input cavity, the secondary input cavity having a coupling for receiving radio frequency signals from an external source;
• and
• an output section, operatively coupled to and interacting with said input section to provide for amplifying of the radio frequency signals, said output section incorporating at least one drift tube, the output section being surrounded by a primary output cavity, the primary output cavity being coupled to a secondary output cavity, the secondary output cavity having a coupling for outputting amplified radio frequency signals to an external device;
• wherein said annular primary input cavity comprises:
• an internal body portion comprising upper and lower annular metal plates, the upper plate being electrically connected with the cathode of the electron gun, and the lower plate being electrically connected with the grid of the electron gun;
• an external body portion comprising upper and lower annular metal surfaces, and upper and lower flanges fixed to the upper and lower annular metal surfaces, respectively;
• and
• an insulating portion comprised of a dielectric material, the insulating portion separating the upper and lower annular plates of the internal body portion, and separating the internal body portion from the external body portion and the flanges thereof;
• wherein the internal body portion and the external body portion, including the flanges thereof, are interleaved in the insulating portion, whereby the internal body portion, the insulating portion, and the external body portion realizes the annular primary input cavity, overlapping channels disposed between the internal and external body portions in the insulating portion providing a relatively high impedance path for radio frequency signals to thereby minimize radio frequency leakage through the insulating portion.

A linear electron beam tube having a longitudinal axis, the tube comprising:

• an input cavity which is substantially cylindrical about the longitudinal axis and arranged to receive, in use, a high frequency signal to be amplified;
• an electron gun arranged to produce an electron beam in a direction substantially parallel to the longitudinal axis;
• and
• an output cavity, interacting with said input cavity for amplifying the high frequency signal and having an output from which an amplified high frequency signal is to be extracted;
• wherein the input cavity substantially surrounds the electron gun and comprises an inner body portion electrically connected to a part of the electron gun and an outer body portion electrically insulated from the inner body portion, the inner body portion being maintained at a relatively high voltage compared to a voltage potential applied to the outer body portion;
• wherein the inner and outer body portions each include an axially extensive flange substantially co-extensive in a direction of the longitudinal axis and electrically insulating material being located between the flanges;
• wherein said input resonant cavity includes two transverse walls, at least one of the transverse walls being part of the inner body portion and part of the outer body portion, and insulating means comprising a member of insulating material disposed between these body portion parts;
• and
• wherein the inner body portion comprises two sections which are electrically separate from one another.

A linear electron beam tube having a longitudinal axis, the tube comprising:

• an input cavity which is substantially cylindrical about the longitudinal axis and arranged to receive, in use, a high frequency signal to be amplified;
• an electron gun arranged to produce an electron beam in a direction substantially parallel to the longitudinal axis;
• and
• an output cavity, interacting with said input cavity for amplifying the high frequency signal and having an output from which an amplified high frequency signal is to be extracted;
• wherein the input cavity substantially surrounds the electron gun and comprises an inner body portion electrically connected to a part of the electron gun and an outer body portion electrically insulated from the inner body portion, the inner body portion being maintained at a relatively high voltage compared to a voltage potential applied to the outer body portion, and
• wherein the inner and outer body portions have respective parts which are co-extensive to present a choke impedance to high frequency energy within the input cavity, and wherein an edge of one or more of the parts, which terminates in a region where a part of the other body portion is extensive, is curved.

A linear electron beam tube having a longitudinal axis, the tube comprising:

• an input cavity which is substantially cylindrical about the longitudinal axis and arranged to receive, in use, a high frequency signal to be amplified;
• an electron gun arranged to produce an electron beam in a direction substantially parallel to the longitudinal axis;
• and
• an output cavity, interacting with said input cavity for amplifying the high frequency signal and having an output from which an amplified high frequency signal is to be extracted;
• wherein the input cavity substantially surrounds the electron gun and comprises an inner body portion electrically connected to a part of the electron gun and an outer body portion electrically insulated from the inner body portion, the inner body portion being maintained at a relatively high voltage compared to a voltage potential applied to the outer body portion, and
• wherein the inner and outer body portions have respective parts which are substantially co-extensive and resiliently deformable electrically insulating material is located between said parts.