Abstract
A concentric arc meander line (CAML) slow wave structure (SWS) was proposed for applications on low voltage and high efficiency Ka-band traveling wave tube (TWT). Due to the CAML formed with a series of concentric arcs, the electric field in the radial direction may be more uniform, which may make the beam-wave interaction more sufficient and the electron efficiency improved. The metal shielding structure with symmetrical ridges was employed for impedance matching to obtain a wide bandwidth. Simulated results demonstrate that the proposed CAML-SWS TWT has a good transmission performance in Ka-band. When the initial beam voltage and current is set to 720 V and 0.2 A, respectively, the output power of the TWT can reach 44.15 W at 35 GHz with the gain and the electron efficiency of 18.6 dB and 30.66%, respectively. Furthermore, the 3-dB bandwidth can cover 24-42 GHz and the electron efficiency is over 23.2% in Ka-band.
Published Version
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