Investigation of a Low-Loss Transmission Structure for W-Band TWT

Le résumé fourni par la source

A low-loss transmission structure forW-band traveling wave tube (TWT) is proposed in this article. It converts the rectangular waveguide fundamental TE10mode into the corrugate waveguide HE11mode with a quasi-Gaussian energy distribution, thereby reducing ohmic loss on the waveguide walls. The sections maintaining and generating the HE11mode are theoretically analyzed. The simulation results show that theS11of the converter is less than -20 dB in the frequency range of 80–100 GHz, and the mode conversion purity reaches 99.66%. Compared with a conventional rectangular waveguide with a 4.5 dB/m transmission loss, the insertion loss of novel structure has successfully been reduced by 3.1 dB/m to as low as 1.4 dB/m Furthermore, the same lengthW-band low-loss transmission structure and rectangular waveguide have been fabricated and cold-tested, the results reveal a reduction in insertion loss of 2.5 dB per meter, verifying the simulation predictions. A burned spot experiment was conducted to verify the energy distribution of the HE11mode. The experimental results confirm the feasibility of the proposed low-loss transmission structure for low-loss transmission inW-band TWT input–output structures.

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