Quarter-wave impedance transformer

A quarter-wave impedance transformer, often written as λ/4 impedance transformer, is a transmission line or waveguide used in electrical engineering of length one-quarter wavelength (λ), terminated with some known impedance. It presents at its input the dual of the impedance with which it is terminated.

The relationship between the characteristic impedance, Z₀, input impedance, Z_in and load impedance, Z_L is: ${\frac {Z_{\mathrm {in} }}{Z_{0}}}={\frac {Z_{0}}{Z_{L}}}$

Alternatives to the quarter-wave impedance transformer include lumped circuits that can produce the impedance inverter function, and stubs for impedance matching.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.