Abstract
A novel mode converter from TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31</sub> mode to TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode in circular waveguide is designed for high power microwave (HPM) system application in this paper. This mode converter is designed based on the mode matching analysis, where the tangential electric field and magnetic field components are continuous on the discontinuous interface of a circular-to-rectangular waveguide junction. The cylindrical TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31</sub> mode is firstly transformed into six ways of rectangular TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode, and then the six ways of TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode are synthesized and converted into the output cylindrical TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode. The maximum conversion efficiency can overreach 99% in the working bandwidth from 1.53GHz to 1.61GHz. The power capacity of this mode converter can reach 1.6GW when it inflates SF6 gas with one atmospheric pressure.
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