Abstract
Abstract : Prior studies of IMPATT diodes have restricted their consideration to one-dimensional representations of these devices. In the present report, some qualitatively new modes of behavior are brought to light from a study of a more realistic multidimensional structure. The primary result of this study is the uncovering of a varied spectrum of new avalanche modes, whose character is discussed in some detail. This spectrum is found to be comprised of two different types of radial TM modes which are referred to as the symmetric and the unsymmetric modes. The totality of prior results of one-dimensional studies turn out to constitute the lowest order mode of the symmetric mode group. This is a quasi-TEM radial wave avalanche mode, which is a bulk mode. The remaining symmetric modes that have been investigated turn out to constitute a new type of avalanche phenomena involving avalanche surface wave modes. The unsymmetric modes correspond most simply to bulk wave modes, but differ considerably from the quasi-TEM bulk mode mentioned above.
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