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Microstrip transmission line, ground plane

Microstrip transmission line consists of a very thin and relatively narrow strip line, which is placed to a true side of a dielectric substrate. The backside of the substrate is covered by continuous metallic layer and serves as a ground plate of zero potential. The whole transmission line is usually put into a rectangular waveguide, which plays to role of shielding. All the metallic parts of the structure (microstrip, ground plate, metallic waveguide) have to be fabricated from a well-conducting electric conductor in order to reach as low attenuation as possible. Considering the same reason, dielectric substrate has to be of as low losses as possible.