PIC simulation for W-band planar helix with straight-edge connections

A square cross section planar helix with straightedge connections has been simulated with a cylindrical electron beam for traveling-wave tube amplifier application. The saturated output peak power varies from 0.65 W to 2.58 W over the frequency range of 85–110 GHz. The maximum electronic efficiency is 7.3 % at 97.5GHz for a beam of 5.8 kV and 8 mA.