Microwave waveguide transitions using planar anisotropic image guides

We propose a new type of planar guide which can offer advantageous polarization characteristics. Consider an arrangement of sub-wavelength inclusions embedded within a host dielectric. These elements can alter the effective dielectric constant of the slab, and when contained within a fixed width for transmission line applications, a planar dielectric-based guide can be realized that allows for field confinement and power routing. Concepts are extended to new guide transitions. In particular, a 90° corner bend and a waveguide cross-over. These novel routing techniques, which exploit line anisotropy and integration and can offer enhanced data capacity with improved signal integrity, are also applicable to new planar antennas and other printed circuits.