Directional properties of dielectric stripline waveguides

Theoretical results are presented on the properties of dielectric stripline waveguides on metallic substrates, which are suitable for use in integrated optical and millimeter-wave devices. It is shown that, in contrast to rectangular dielectric waveguides, the stripline waveguides have a range of frequencies where the directional properties are most pronounced. Beginning with a certain value of frequency, energy concentration and directivity in the stripline waveguide are greater at the first higher mode than at the fundamental mode.