Dispersion and impedance characteristics for single and coupled strip in multilayered cylindrical dielectrics using 3D TLM method

An inhomogeneous, multi-layered cylindrical stripline is analyzed using TLM method. Dispersion characteristics of dominant as well as higher order modes and impedance characteristics for dominant mode are obtained for single and coupled cylindrical stripline. Cylindrical stripline consists of circular arc strip placed between two cylindrical ground planes separated by multilayer dielectrics. Using flexible dielectric materials, it is possible to construct non-planar transmission lines that can be warped around with a cylindrical surface and used to excite conformal arrays mounted on a cylindrical object. A cylindrical transmission line is also useful for wide band power combining applications with considerable size reduction. The non-planar lines can also be used as a coaxial to planar transition adapters and baluns.