The Design of Quarter-Wave Matching Layers for Dielectric Surfaces

A quarter-wave transformer to match the junction between an empty waveguide and one completely filled with a dielectric may be made from a waveguide partially filled with dielectric. A method of designing such a transformer, when all the waveguides have the same cross-section, is described, and experimental results are given to show that this design is satisfactory. A similar arrangement can be used to match the surfaces of a dielectric lens: slots are cut on the surface and design information is given for slots parallel or perpendicular to the electric field of the wave incident on the surface. Measured reflection coefficients for a surface matched in this way are in good agreement with calculated values.