[[Image:Info_icon.png|40px]] Click here to see a '''[[List of Physical Transmission Line Types]]'''.
[[File:tline6.png|thumb|320px| Microstrip Line Calculator.]]
=== Physical Line Calculators and Designers ===
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[[File:tline6.png|thumb|320px| Microstrip Line Calculator.]]
</td>
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[[File:tline10.png|thumb|320px| CPW Line Calculator.]]
</table>
[[File:tline7.png|thumb|320px| Microstrip Line Designer.]]
Oftentimes, you may want to design a 50Ω transmission line of a certain type, or calculate and compare the characteristics of several transmission line types. For every physical transmission line type, [[RF.Spice]] also provides a designer tool. The designer ignores conductor and dielectric losses and calculates the physical dimensions of the line for a given value of the characteristic impedance Z0. For example, given a substrate with thickness h and relative permittivity ε<sub>r</sub>, the "Microstrip Designer" calculates the microstrip width in mm for a given value of Z0 (50 Ohms by default). Some line type like CPW and coaxial line have more than one dimensional parameter that can be varied. For example, CPW has slot width (w) and center strip width (s), while coaxial line has inner and outer conductor radii. In such cases, the Line Designer dialog provides radio button options to fix one parameter and vary the other.
<table>
<tr>
<td>
[[File:tline7.png|thumb|320px| Microstrip Line Designer.]]
</td>
<td>
[[File:tline11.png|thumb|320px| CPW Line Designer.]]