Abstract
This study proposes a dual-mode converter for coupling the TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes in a circular waveguide. A Y-type power divider is employed to convert the rectangular waveguide TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode into the circular TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode. A coaxial-type transformer is adopted between the coaxial and circular waveguides to directly transfer the coaxial TEM mode to the circular TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> . These two coupling systems are integrated and concentric with same output port. The field profiles for TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> and TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes are azimuthal symmetric and orthogonal to each other, thus a pair of this converter could be connected with bearing and achieve a high isolation, broadband, dual-channel rotary joint for radar or satellite system. This dual-mode converter can also be applied on applications of plasma heating and material processing for high uniformity.
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