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PendEl Technology

The fundamental operating principle of the traveling wave tube is the conversion of kinetic energy in a high velocity electron beam to radio-frequency (RF) energy carried on a helical "slow wave" structure. The microwave (RF) signal gains power as it travels along the helix through a mechanism of mutual interaction between the fields on the helix and the fields of the high voltage electron beam accelerated through the helix. See the links below for images that depict a Traveling Wave Tube and its power supply and a cross sectional view of a typical TWT.

PendEl TWTs achieve high RF power and exceptional reliability using an especially rugged slow wave structure that is unique in the industry. Specifically, a precisely wound copper helix is supported by ceramic blocks that are brazed to both the helix and to the body of the tube. Such an arrangement provides intimate thermal contact and superior mechanical integrity thereby conferring several advantages over the more conventional rod supported compressed tungsten helix structures used by others. These advantages include, but are not limited to, cooler circuit operation, lower RF losses, and a more robust internal attenuator permitting the TWT to operate into much higher levels of load VSWR without damage.

To aid in the analysis and design of its devices, PendEl uses state-of-the-art computer codes for simulating the electron beam, cold circuit, and large signal characteristics of the TWT. Codes include EGUN, CTLSS, Christine 1-D, and others.

TWT and Power Supply
TWT Cross Section
Helix Comparison
Helix Circuits
L-Band Sub-Assemblies
Electron Beam Simulation
Block Supported CTLSS Example

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