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High Quality Content by WIKIPEDIA articles! A quarter wave impedance transformer, often written as ?/4 impedance transformer, is a component used in electrical engineering consisting of a length of transmission line or waveguide exactly one quarter of a wavelength (?) long and terminated in some known impedance. The device presents at its input the dual of the impedance with which it is terminated. It is a similar concept to a stub; but whereas a stub is terminated in a short (or open) circuit and the length designed to produce the required impedance, the ?/4 transformer is the other way around; it is a pre-determined length and the termination is designed to produce the required impedance.