Planar transmission lines

thumb|right|200px|Cross-section of microstrip geometry. Conductor A is separated from ground plane D by dielectric substrate C. Upper dielectric B is typically air.

type of planar transmission line

thumb|right|250px|Cross-section diagram of stripline geometry. Central Electrical conductor|conductor (A) is sandwiched between ground planes (B and D). Structure is supported by [[dielectric (C).]]

synthetic rectangular electromagnetic waveguide