This study proposes a dual-mode converter for coupling the TE01 and TM01 modes in a circular waveguide. A Y-type power divider is employed to convert the rectangular waveguide TE10 mode into the circular TE01 mode. A coaxial-type transformer is adopted between the coaxial and circular waveguides to directly transfer the coaxial TEM mode to the circular TM01. These two coupling systems are integrated and concentric with same output port. The field profiles for TM01 and TE01 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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