Analysis of a Waveguide Partially Filled with a Dielectric Material

A rectangular waveguide partially filled with an anisotropic dielectric material has been analysed. The method of analysis has shown to be quite powerful in particular for high dielectric constant materials. A new configuration with a rectangular waveguide unsymmetrically loaded with a rectangular dielectric insert has been analysed and tested experimentally. As compared e.g. with an image line, the insertion loss of the unsymmetrically loaded waveguide was found to be much lower and the manufacturing problems less troublesome. The unsymmetrically loaded structure has recently been successfully used in a travelling wave maser designed for 30 GHz.