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The design and implementation of Ka-band three-beam cascaded serpentine travelling-wave tube (TWT) amplifiers are presented. In the multiple-beam cascaded TWT concept1, the RF output from each interaction circuit stage is serially connected to the input of the next stage, with each stage driven by a separate electron beam. This configuration provides flexibility for gain, bandwidth, and power trade-offs...
A series of Ka-band Coupled-Cavity Traveling-Wave Tubes (CCTWTs) has been successfully developed, built, and tested at Communications and Power Industries (CPI) in collaboration with the Naval Research Laboratory (NRL) and SAIC. These devices represent a significant advance in the state-of-the-art of millimeter-wave CCTWTs, exploring the limits of power, bandwidth, and stability. We discuss the design...
A helix TWT having unprecedented power across the full K/Ka band (18–40 GHz) has been developed. This TWT has a minimum CW output power greater than 130 W over the full band and greater than 200 W for most of the band (19 to 38 GHz). This K/Ka band helix TWT development has leveraged the underlying technology from L-3 ETI's high-power millimeter-wave helix TWTs that were developed over the last several...
The design of a Ka-band three-beam cascaded serpentine travelling-wave tube (TWT) amplifier is presented. Simulations predict that a peak power of 3.5 kW with saturated gain of 16 dB and an instantaneous bandwidth of 30% can be achieved in a circuit length of ≤ 4.5 cm driven by three 20 kV beams with 0.5-A each. A plan for a proof-of-principle experiment will also be discussed.
Extensive numerical analysis has resulted in the conclusion that the THz (H-band) sheet beam traveling wave tube (TWT) amplifier circuit, comprised of a staggered double grating array waveguide, has the very broad bandwidth (~ 30 %) of the fundamental passband (TE-mode) with a 7 : 1 aspect ratio sheet beam without excitation of n = 1 space harmonic backward wave modes. Particle-in-cell (PIC) simulations...
A new concept for a compact high-gain multiple-beam TWT amplifier is introduced. To illustrate the concept, we present the design of a three-beam 220-GHz serpentine TWT amplifier. MAGIC-3D particle-in-cell code simulation results predict that the device should be capable of a peak power of 73 W and saturated gain of 42 dB over an instantaneous bandwidth of 50 GHz (23%), when powered by three 100 mA,...
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