A method and system are provided for generating a data structure representative of a fault tree for a system. A first portion of the radial outer surface of the cage extends in a slightly spaced relation to the corresponding portion of the inner surface of the housing, and a second portion of the radial outer surface of the cage projects from the first portion in a radial direction and engages the corresponding portion of the inner surface of the housing. The first split portion and the second split portion are cut up to a conductor edge of the first conductor layer. The input stage is configured to reduce a third order harmonic term of the output so that an output power plot of the third order harmonic term with respect to an input power has a notch with a local minimum.