Featured Paper by S. Lefeuvre & M. Ghomi
COMSOL, adding SPICE® elements into its FEM, gives the possibility of a direct modeling of oscillators: triode and load are FEM described while all the other components of the circuit are just simulated using SPICE®. The modeling is not a straight application of any module but needs the previous computation of the conductivity of the beam through the PDE interface. This paper is a bench mark showing the influence of the triode geometry on the performances of the circuit, mainly frequency and efficiency, and their evolution all along the process. It gives to the user of high power triodes/tetrodes the possibility to enter into their design in order to have a tube well matched to their needs, including on the thermal points.
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