Back to results
US 6,356,023 B1Granted
Traveling wave tube amplifier with reduced sever
AssigneeAmpWave Tech, LLC
InventorHenry G. Kosmahl
Life of this patent
Estimating the term…
Abstract
A structure to eliminate non-fundamental space harmonics in helical traveling wave tubes is disclosed. A sever of moderate attenuation is produced by way of a conductive surface on nonconductive rods supporting a helical conductor in a traveling wave tube. In addition, the radius and pitch of the helical conductor are simultaneously varied over a short distance to improve the efficiency and performance of the tube.
Claims37
A helical traveling wave tube for amplifying an RF signal, comprising:
- a traveling wave tube, having a cathode, an anode and a collector, operably connected to induce a beam of electrons to flow between the anode and the cathode, and wherein the collector receives the beam of electrons;
- a helical conductor section between the cathode and the collector, said helical conductor section having an RF input, an input section, a middle section, an output section, and an RF output, and wherein the input section has an adverse space harmonics taper (ASHT), wherein a pitch and radius of the input section vary linearly in the direction of propagation of the helical conductor;
- a housing containing the traveling tube and the helical conductor section;
- at least one dielectric supporting rod between the helical conductor and the housing, said at least one rod along at least a portion of the length of the helical conductor;
- and
- a sever, comprising a conductive surface on said at least one dielectric rod, such that the attenuation of an RF signal ranges from about 1 db to about 30 db.
3 more elements
A helical traveling wave tube for amplifying an RF signal, comprising:
- a traveling wave tube, having a cathode, an anode and a collector, operably connected to induce a beam of electrons to flow between the anode and the cathode, and wherein the collector receives the beam of electrons;
- a helical conductor section between the cathode and the anode, said helical conductor section having an RF input, an input section, a middle section, an output section, and an RF output, wherein the input section has an adverse space harmonics taper (ASHT), wherein a pitch and radius of the input section vary simultaneously in the direction of propagation of the helical conductor;
- a housing containing the traveling tube and the helical conductor;
- at least one dielectric supporting rod between the helical conductor and the housing, said at least one rod along at least a portion of the length of the helical conductor;
- and
- a sever, comprising a conductive surface on said at least one dielectric rod, such that the attention of an RF signal ranges from about 1 dB to about 30 db,
- wherein the pitch and the radius of the input section vary linearly according to the function p ( z ) a ( z ) = p 0 a 0 ,
- where p(z) is a pitch of the input section, which varies linearly in the direction of propagation of the helical conductor, the z-axis;
- p0 is a pitch of the middle section;
- a(z) is a radius of the input section, which varies linearly in the direction of propagation of the helical conductor, the z-axis;
- and a0 is a radius of the middle section.
8 more elements
A method of manufacturing a sever on a dielectric rod, comprising:
- providing a dielectric rod;
- and
- depositing a sever in the form of a conductive material on the surface of the rod, said sever having a start section, a middle section, and a finish section;
- testing the sever in a traveling wave tube amplifier for RF attenuation of 1 to 30 dB, wherein the traveling wave tube amplifier has a helical conductor with an input section having an adverse space harmonics taper, and wherein a pitch and a radius of the input section vary linearly in a direction of propagation of the helical conductor;
- and
- adjusting the sever according to the results of the testing.
3 more elements
Dependencies are inferred from the claim text.