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<td id="content-inside"><div id="content_fixed_bg"><table width="100%" border="0" cellspacing="0" cellpadding="0">
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<td align="left" valign="top"><p><img src="images/t_showroom.jpg" width="114" height="21" /></p></td>
</tr>
<tr>
<td align="left" valign="middle" class="hd02">MIMO Antenna</td>
</tr>
<tr>
<td align="left" valign="middle"> </td>
</tr>
<tr>
<td align="left" valign="top" class="text">GEMS is used to simulate the MIMO antenna that includes two PIFA antennas. The antenna is relatively thin compared to its dimensions in the horizontal directions (550:1). GEMS allows you to use a flat domain and achieve the accurate results. The output parameters are MEG, ECC, S-matrix, total active reflection coefficient, and far field patterns. In this showcase, we also compare the simulation result using the large, mediate and small domains in the z-direction. </td>
</tr>
<tr>
<td align="left" valign="top" class="text"> </td>
</tr>
<tr>
<td align="left" valign="top" class="hd01">The basic design procedure in the simulation:</td>
</tr>
<tr>
<td align="left" valign="top" class="text"><table width="100%" border="0" cellspacing="2" cellpadding="2">
<tr>
<td width="3%" align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td width="97%" align="left" valign="middle" class="text">Draw the substrate first and then assign the dielectric material to it</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Draw an “F” shaped structure </td>
</tr>
<tr>
<td align="left" valign="top"><img src="images/bullet3.jpg" width="15" height="14" vspace="3" /></td>
<td align="left" valign="middle" class="text">Draw a ground and assign it to be PEC</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Draw a via at one end of the PIFA</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Draw a line between another end of the PIFA and the ground, and assign it as a lumped port. Assign its group ID to be “1”</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Select the PIFA, probe and lumped port, and click on the Mirror button in the toolbar to generate an image about the symmetric plane.</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Change the group ID of the imaged lumped port to “2”</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Check the “Output far field pattern for each excitation” in the far field parameter setting window </td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Specify the domain size and boundary (PML).</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Generate the adaptive mesh</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Specify the convergence criterion</td>
</tr>
<tr>
<td align="left" valign="middle"><img src="images/bullet3.jpg" width="15" height="14" /></td>
<td align="left" valign="middle" class="text">Simulate the project using a single PC or cluster</td>
</tr>
</table></td>
</tr>
<tr>
<td height="35" align="left" valign="middle" class="text"><span class="hd01">The basic settings in the simulation:</span></td>
</tr>
<tr>
<td align="left" valign="top" class="text"><table width="85%" border="0" align="center" cellpadding="3" cellspacing="3" class="table-border">
<tr>
<td width="28%" align="left" valign="top" bgcolor="#0056E9" class="text-white">Option</td>
<td width="38%" align="left" valign="top" bgcolor="#0056E9" class="text"><div align="center" class="text-white">Setting</div></td>
<td width="34%" align="left" valign="top" bgcolor="#0056E9" class="text"><div align="center" class="text-white">Description</div></td>
</tr>
<tr>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">Boundary</td>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">PML truncates six walls</td>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;"><p>Open space problem</p>
</td>
</tr>
<tr>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;">Excitation</td>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;"><p>Lumped port</p> </td>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;">Provide a match load for an open port and excitation </td>
</tr>
<tr>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">Mesh</td>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">Non-uniform</td>
<td align="left" valign="middle" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">Adaptive mesh</td>
</tr>
<tr>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;">Output</td>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;">MEG, ECC, S matrix, far field patterns</td>
<td align="left" valign="top" bgcolor="#FDECB3" class="text" style="padding-left:5px;">Parameters of MIMO antenna</td>
</tr>
<tr>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">Simulation</td>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;">A multiple core PC or cluster</td>
<td align="left" valign="top" bgcolor="#FEF4D1" class="text" style="padding-left:5px;"> </td>
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<td align="left" valign="top" class="text"> </td>
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<td align="left" valign="middle"><table width="100%" border="0" align="center" cellpadding="0" cellspacing="5">
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<td valign="top"><table width="98%" border="0" align="center" cellpadding="0" cellspacing="0">
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<td height="50" valign="middle" class="hd03"><p>Dual PIFA Antenna</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo01.jpg" width="245" height="195" /></td>
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<td align="center" valign="top"> </td>
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<td height="55" class="hd03"><p>Far Field Patterns</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo04.jpg" width="245" height="195" /></td>
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<td align="center" valign="top"><table width="98%" border="0" align="center" cellpadding="0" cellspacing="0">
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<td height="50" valign="middle" class="hd03"><p>S-Parameters</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo02.jpg" width="245" height="195" /></td>
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<td align="center" valign="top"> </td>
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<td height="55" class="hd03"><p>ECC</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo05.jpg" width="245" height="195" /></td>
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<td align="center" valign="top"><table width="98%" border="0" align="center" cellpadding="0" cellspacing="0">
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<td height="50" class="hd03"><p>Radiation Efficiency</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo03.jpg" width="245" height="195" /></td>
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<td align="center" valign="top"> </td>
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<td height="55" class="hd03"><p>MEG</p></td>
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<td align="center" valign="top"><img src="images/img_showroom-mimo06.jpg" width="245" height="195" /></td>
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</table></td>
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</table></td>
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<td align="left" valign="middle"><table width="65%" border="0" align="center" cellpadding="0" cellspacing="5">
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<td height="50" align="center" class="hd03"><p>3-D Far Field Pattern</p></td>
<td align="center" class="hd03"> </td>
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<td align="center"><img src="images/img_showroom-mimo07.jpg" width="245" height="195" /></td>
<td align="center"> </td>
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