Sketch of the symmetric double V-shape meander-line SWS (a) and the FF SWS (b). The FF SWS can be seen as a three dimensional extension of the symmetric double V-shaped microstrip meander-line SWS.
The top view (a) and side view (b) of the FF SWS with dimensional parameters.
Dispersion characteristics and interaction impedances of the FF SWS. At the design frequency (140 GHz), the FF SWS has lower phase velocity and larger average interaction impedance.
Dispersion curves and interaction impedances for different transverse widths b .
Dispersion curves and interaction impedances for different half bending angles of the V-shape θ .
Dispersion curves and interaction impedances for different vertical heights h .
3-D sketch of FF SWS TWT model by CST.
Reflection loss S11 parameters in dB at the input port.
Input and output signals of FF TWT at 140 GHz.
Electron kinetic energy of FF TWT at 140 GHz versus longitudinal distance.
Spectrum of the output signal.
Plot of output power and electron efficiency of FF TWT versus frequency.
The comparison of electron efficiency between the folded frame TWT and the symmetric double V-shaped meander-line TWT.
Plot of input power versus gain at 140 GHz.
Plot of saturated gain of the FF TWT versus frequency.
Optimized parameters of FFSWS working on 140 GHz.
Optimized electrical parameters for FF SWS TWT.
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