An isolated dual-mode converter for dual-channel rotary joint

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.