[[Image:Back_icon.png|30px]] '''[[EM.Cube#EM.Tempo_Documentation | Back to EM.Tempo Tutorial Gateway]]'''
{{projectinfo|Tutorial|Simulating A Monopole Antenna Interacting With A Human Head Model|Tempo L11 Fig title.png|In this project, a human head model is imported, and its interaction with a monopole antenna is analyzed in EM.Tempo.|
*[[Building_Geometrical_Constructions_in_CubeCAD | CubeCAD]]
In this tutorial you will learn how to import several external CAD models, transfer them to [[EM.Tempo]] and combine them with your own object drawings. You will construct a physical structure with different types of materials, especially a lossy dielectric. You will use a new type of mesh generator for discretization of this structure.
[[Image:Back_icon.png|30px]] '''[[EM.Tempo | Back to EM.Tempo Manual]]'''
[[Image:Back_icon.png|30px]] '''[[EM.Cube#EM.Tempo_Documentation | Back to EM.Tempo Tutorial Gateway]]'''
[[Image:Download2x.png|30px]] '''[http://www.emagtech.com/downloads/ProjectRepo/EMTempo_Lesson11.zip Download projects related to this tutorial lesson]'''
==Getting Started==
|-
! scope="row"| Dielectric_1
| Dielectric
| Light green
| Plastic
| ε<sub>r</sub> = 2.2, μ<sub>r</sub> = 1, σ = 0, σ<sub>m</sub> = 0
|-
! scope="row"| Dielectric_2
| Dielectric
| Orange
| Flesh
| ε<sub>r</sub> = 65, μ<sub>r</sub> = 1, σ = 0.6S/m, σ<sub>m</sub> = 0
|-
! scope="row"| Dielectric_2
| Dielectric
| Light green
| Plastic
| ε<sub>r</sub> = 2.2, μ<sub>r</sub> = 1, σ = 0, σ<sub>m</sub> = 0
|}
Note that Dielectric_2 Dielectric_1 has a very high relative permittivity and a large electric conductivity. At the center frequency of 900MHz, this is equivalent to a tangent loss of:
<math> \tan\delta = \frac{\epsilon^{\prime}}{\epsilon^{\prime\prime}} = \frac{1}{\epsilon^{\prime}}\frac{\sigma}{\omega\epsilon_0} = \frac{0.6}{(60)(2\pi \times 9\times 10^8)(8.854\times 10^{-12})} = 0.186S/m </math>
</table>
Generate and view the mesh of the human head and the radio unit. A 206 208 × 169 171 × 239 240 grid space is generated, which amounts to a total of more than 8.3 5 million cells. You have a very large computational problem at hand. Keep in mind that [[EM.Tempo]] generates the Yee mesh at the highest frequency of the bandwidth, which is 1.2GHz in this project.
{{Note|If your computer's RAM memory cannot handle the specified mesh settings, reduce the mesh density.}}
</table>
Also plot the 2D polar pattern graphs in EM.Grid. From the YZ-plane graph, you can clearly see that the radiation pattern of the monopole antenna is no longer omni-directional.
<table>
</table>
Finally, plot the S<sub>11</sub> parameter of the antenna in EM.Grid. You can see from the figure below the return loss is minimized around 835MHz.
<table>
<p> </p>
[[Image:Top_icon.png|30px]] '''[[#What_You_Will_Learn | Back to the Top of the Page]]'''
[[Image:Back_icon.png|30px]] '''[[EM.Cube#EM.Tempo_Documentation | Back to EM.Tempo Tutorial Gateway]]'''