Novel X band Compact Waveguide Dual Circular Polarizer
  A novel type of dual circular polarizer is developed to convert the TE10 mode into two different polarization TE11 modes in a circular waveguide. This design consists two major parts: a TE10 to TE10/TE20 converter and an overmoded TE10/TE20 to circular TE11 modes converter. 
Chen Xu, Sami Tantawi, Juwen Wang
physics.acc-ph physics.optics