Transmission Loss Due to Resonance of Loosely-Coupled Modes in a Multi-Mode System

Abstract

In a multi-mode transmission system the presence of spurious modes which resonate in a closed environment can produce an appreciable loss to the principal mode. The theory for the evaluation and control of this effect under certain conditions has been derived and checked experimentally in the particularly interesting case of a TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> transmission system, where mode conversion to TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02</inf> , TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</inf> … is produced by tapered junctions between two sizes of waveguide.