## Open Wire Line Impedance Calculator

- Choose the line structure to be calculated, and then fill in the relative
permittivity of the dielectric and the dimension parameters.
- Select the
**Z0** button to calculate the characteristic impedance of
the corresponding line.

If you leave the relative permittivity **Er** blank, a default line
dimension will be used, and the characteristic impedance
is calculated after selecting the **Z0** button.
Equations used to make these calculations can be found in the book [1],
and are also provided below the corresponding structure.

** 1. Single wire above ground **

** 2. Balanced two-wire line **

*
[1] K. Chang, "Handbook of Microwave and Optical Components", Vol 1,John Wiley & Sons, New York, p. 8, 1989.
*

THE FORMULAS ARE APPROXIMATIONS!

They should not be used when a high degree
of accuracy is required.
This calculator is developed by Kami Electromagnetic Compatibility Laboratory, UEC. Questions concerning this calculator or update information for this web site should be sent to