A normal mode formulism is developed for the purpose of treating transition structures in waveguide devices. This development includes: (1) a coupled mode theory representation of local normal modes, (2) a four-port scattering model that connects the normal modes at a general transition, (3) a general expression for power transfer between normal modes at an abrupt transition, and (4) a demonstration of reciprocity.>
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W. K. Burns (1988) studied this question.
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