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The design of waveguide disc resonators for oscillators at W-band frequencies is described by the help of a finite element CAD-software package. The method considers the active device encapsulation inherently and therewith the socalled parasitic elements. The computation of output power from a standard GaAs Impatt diode for an encapsulation technique with integrated modules is given as example, The results are.compared with rf measurements at 90 GHz.