(a) Conceptual drawing of MEMS-integrated 0.22 THz sheet beam traveling wave tube (TWT) amplifier. (b) 3D schematics of high efficiency interaction rf-circuit with dimensional parameters of the structure.
Linear growth rate (LHS: black) and saturated radiation power (RHS: gray) obtained from frequency sweep with particle-in-cell simulations.
SEM photos of (a) UV-LIGA fabricated and (b) CNC nanomachined (bottom) circuits. (c) AFM-measured surface roughness.
S-parameter graphs ( and ) of (a) UV-LIGA fabricated and (b) CNC nanomachined circuits.
(a) SEM images of nano--doped W powder. (b) XRD pattern of nano--doped W powder.
(a) SEM images of cathode emission surface. (b) Emission characteristics at different cathode temperatures.
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