Traveling wave tube amplifier with reduced sever
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
31 Citations
37 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. 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
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.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. 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. - View Dependent Claims (33, 34, 35, 36, 37)
-
Specification