Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume -, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2023.3242218
Keywords
Double staggered grating waveguide (DSGW); slow wave structure (SWS); sub-THz; traveling wave tube (TWTs)
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A modified double staggered grating waveguide (DSGW) slow wave structure (SWS) is proposed for millimeter-wave and sub-THz traveling wave tubes (TWTs). The proposed SWS, which uses gratings with a cross section outline of exponential curves, exhibits higher interaction impedance compared to DSGW, resulting in higher output power and gain. Particle-in-cell (PIC) simulations show that a TWT with sheet electron beam (SEB) and the proposed SWS achieves a maximum power of 116.64 W, indicating a significant improvement compared with the traditional DSGW.
A modified double staggered grating waveg-uide (DSGW) slow wave structure (SWS) is proposed for millimeter-wave and sub-THz traveling wave tubes (TWTs). Gratings with a cross section outline of exponential curves are applied instead of the traditional rectangular cross section. The proposed SWS owns a higher interaction impedance compared to DSGW, resulting in higher output power and gain. With proper design and optimization of the input-output couplers, the proposed SWS can have a wide -15 dB impedance bandwidth, extending from 192 to 230 GHz. Particle-in-cell (PIC) simulations are carried out for a TWT with sheet electron beam (SEB) and the main SWS having 70 periods. Such a TWT provides a maximum power of 116.64 W which indicates a significant improve-ment compared with the traditional DSGW.
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