A novel wideband TM01-to-TE11 mode converter

A novel, state-of-the-art design is presented for a TM01-to-TE11 circular waveguide mode convertor, providing over 30% bandwidth of extraneous-mode-free operation at a conversion loss of less than 0.5 dB. The design philosophy is based upon the unique use of two intermediate modes, a coaxial TEM and a rectangular waveguide TE10, which provide input-output isolation of the converted modes.