# characteristic impedance ( * Z * _{ o } )

**characteristic impedance (***Z* _{o}): 1. The impedance of a circuit that, when connected to the output terminals of a uniform transmission line of arbitrary length, causes the line to appear infinitely long. *Note 1:* A uniform line terminated in its characteristic impedance will have no standing waves, no reflections from the end, and a constant ratio of voltage to current at a given frequency at every point on the line. *Note 2:* If the line is not uniform, the iterative impedance must be used. **2.** For Maxwell's equations, the impedance of a linear, homogeneous, isotropic, dielectric propagation medium free of electric charge, given by the relation *Z* =(/)^{½} where is the magnetic permeability and is the electric permittivity of the medium.

This HTML version of FS-1037C was last generated on Fri Aug 23 00:22:38 MDT 1996