STRIPLINES.

The article discusses the basic configuration of striplines. The stripline, is the oldest planar transmission line and has been in use in microwave integrated circuits since its creation. Although striplines can support waveguide-type modes, the fundamental mode of propagation is the transverse electromagnetic mode, which has no cutoff frequency. The usable single-mode bandwidth of a stripline is determined by the cutoff frequency of the lowest-order waveguide mode. For that mode, the two ground planes have the same potential and the electric field is normal to the strip and the ground planes.