The power handling capacity of slab lines

Slab lines consisting of a circular cylindrical inner conductor centrally located between two parallel conducting plates have recently been employed in the development of high-power microwave components. This paper presents an evaluation of the power handling capacity of such lines. The method employed leads to highly accurate results. A power capacity expression is derived in terms of the shape ratio and the characteristic impedance of the line. The variation of this power is plotted as a function of the characteristic impedance for a given outer conductor plate spacing. Finally, the power capacity of this line is compared to that of a coaxial transmission line.