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A sheet beam traveling wave tube is designed, producing 231W at 94 GHz with a corresponding gain of 33.6 dB. A uniform longitudinal magnetic field of 0.9 T was used in the CST PIC simulation. The attenuator material is with a moderate loss tangent of 0.35 and a relative permittivity of 6.4. To get a stable operation of the tube, the reflectors for the input/output (I/O) structure are covered by attenuators...
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