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<TITLE>The arbitrary transmission line calculator FAQ</TITLE>
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<p>Here are a number of examples of using <COde>atlc</code>. Most of the example files can be found in the examples directory or if atlc is installed on the system, they will normally be located at /usr/local/share/atlc/examples. The very largest files, are not distributed to save disk space.</p>
<TABLE>
<TR>
<TD><STRONG>Cross section</STRONG></TD>
<TD><STRONG>Properties</STRONG></TD>
<TD><STRONG>E-field</STRONG></TD>
<TD><STRONG>Ex field </STRONG></TD>
<TD><STRONG>Ey-field</STRONG></TD>
<TD><STRONG>Voltage</STRONG></TD>
<TD><STRONG>Energy</STRONG></TD>
<TD><STRONG>Permittivity</STRONG></TD>
</TR>
<TR>
<TD><img src="jpgs/multi-dielectric.jpg" width="100" height="100" ALT="multiple dielectric"></TD>
<TD><STRONG>multi-dielectric.bmp:</STRONG> <br>C= 94.3325 pF/m <br>L= 274.7756 nH/m <br>Zo= 53.9708 Ohms</TD>
<TD><img src="jpgs/multi-dielectric.E.jpg" width="100" height="100" ALT="multiple dielectric E-field"></TD>
<TD><img src="jpgs/multi-dielectric.Ex.jpg" width="100" height="100" ALT="multiple dielectric Ex-field"></TD>
<TD><img src="jpgs/multi-dielectric.Ey.jpg" width="100" height="100" ALT="multiple dielectric Ey-field"></TD>
<TD><img src="jpgs/multi-dielectric.V.jpg" width="100" height="100" ALT="multiple dielectric V-field"></TD>
<TD><img src="jpgs/multi-dielectric.U.jpg" width="100" height="100" ALT="multiple dielectric U-field"></TD>
<TD><img src="jpgs/multi-dielectric.Er.jpg" width="100" height="100" ALT="multiple dielectric Er-field"></TD>
</TR>
<TR>
<TD><img src="jpgs/ushape.jpg" width="100" height="100" ALT="ushaped-line"></TD>
<TD><STRONG>ushape.bmp:</STRONG> <br>C= 76.4283<br>L= 145.5809 nH/m <br>Zo= 43.6441 Ohms</TD>
<TD><img src="jpgs/ushape.E.jpg" width="100" height="100" ALT="ushaped-line-E"></TD>
<TD><img src="jpgs/ushape.Ex.jpg" width="100" height="100" ALT="ushaped-line-Ex"></TD>
<TD><img src="jpgs/ushape.Ey.jpg" width="100" height="100" ALT="ushaped-line-Ey"></TD>
<TD><img src="jpgs/ushape.V.jpg" width="100" height="100" ALT="ushaped-line-voltage"></TD>
<TD><img src="jpgs/ushape.U.jpg" width="100" height="100" ALT="ushaped-line-energy"></TD>
<TD><img src="jpgs/ushape.Er.jpg" width="100" height="100" ALT="ushaped-line-permittivity"></TD>
</TR>
<TR>
<TD><img src="jpgs/coax2.jpg" width="100" height="100" ALT="Coax"></TD>
<TD><STRONG>coax2.bmp:</STRONG> <br>C= 47.6374 pF/m<br> L= 233.5667 nH/m<br> Zo= 70.0215 Ohms</TD>
<TD><img src="jpgs/coax2.E.jpg" width="100" height="100" ALT="Coax-E-field"></TD>
<TD><img src="jpgs/coax2.Ex.jpg" width="100" height="100" ALT="Coax-Ex field"></TD>
<TD><img src="jpgs/coax2.Ey.jpg" width="100" height="100" ALT="Coax-Ey-field"></TD>
<TD><img src="jpgs/coax2.V.jpg" width="100" height="100" ALT="Coax-Voltage"></TD>
<TD><img src="jpgs/coax2.U.jpg" width="100" height="100" ALT="Coax-Energy"></TD>
<TD><img src="jpgs/coax2.Er.jpg" width="100" height="100" ALT="Coax-Energy"></TD>
</TR>
<TR>
<TD><img src="jpgs/very-odd.jpg" width="100" height="100" ALT="very odd transmission line"></TD>
<TD><STRONG>very-odd.bmp:</STRONG><br>C=59.1756 pF/m <br>L= 188.0251 nH/m<br> Zo= 56.3685 Ohms</TD>
<TD><img src="jpgs/very-odd.E.jpg" width="100" height="100" ALT="E-field"></TD>
<TD><img src="jpgs/very-odd.Ex.jpg" width="100" height="100" ALT="Ex field"></TD>
<TD><img src="jpgs/very-odd.Ey.jpg" width="100" height="100" ALT="Ey field"></TD>
<TD><img src="jpgs/very-odd.V.jpg" width="100" height="100" ALT="Voltage"></TD>
<TD><img src="jpgs/very-odd.U.jpg" width="100" height="100" ALT="Energy"></TD>
<TD><img src="jpgs/very-odd.Er.jpg" width="100" height="100" ALT="Energy"></TD>
</TR>
</TABLE>
<br>
The full details of exactly what the files mean is given <a href="fileformat.html">here.</a>
<p>In the case of the open structures (such as microstrip or twin-wire cables) the electric field extends to infinity, as there is no surrounding conductor like in the case of the coax, u-shaped conductor of the very odd shape. By putting an open structure onto a finite grid, which does not extend to infintiy, we have introduced an error. You should check that the electric field in the file <code>
of such structures is zero close to the edges - if not, a significant error will be introduced. </p>
<p>atlc is written and supported by <a href="jpgs/home-email.jpg">Dr. David Kirkby (G8WRB)</A> It it issued under the <a href="http://www.gnu.org/copyleft/gpl.html">GNU General Public Licence</A><p>
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