Changes

/* Moving the Transmitter into a Dense Area */
<td>
[[Image:ART MANH Fig18.png|thumb|left|550px|The received power coverage map of the Manhattan scene with a rotated horizontal Yagi-Uda array at f = 1.5GHz.]]
</td>
</tr>
</table>
 
 
 
 
<table>
<tr>
<td>
[[Image:PROP255.png|thumb|550px|The received power coverage map of the Manhattan scene with the transmitter moved into an area with high building density.]]
</td>
</tr>
</table>
 
As you can see from the above figure, the coverage area is still very limited, with a few streets getting some coverage. If you open the property dialog of the short dipole source, you will notice a default value of 1A for the dipole current. The dialog also shows a value of 227.4mW for the dipole source's radiated power. Increase the dipole current to 10A. This will increase the radiated power 100-fold to 22.7W, as the power of a short dipole radiator varies as |I|<sup>2</sup>. Run a new SBR simulation and compare the coverage maps.
 
<table>
<tr>
<td>
[[Image:PROP259.png|thumb|350px|The Short Dipole Source dialog.]]
</td>
<td>
[[Image:PROP260.png|thumb|550px|The received power coverage map of the Manhattan scene with significantly increase transmitted power.]]
</td>
</tr>
</table>
 
Overall, increasing the transmitted power lifts the coverage map by 20dB (100-fold) as you can verify from the maximum received power values in the two plots. However, the dense array of nearby buildings still block most of the coverage into the streets even though a good number of new signal paths have appeared in the latest coverage map.
 
The figures below show the distribution of the three X, Y and Z components of the electric field in the Manhattan scene. Note that your short dipole source is vertically polarized. The X and Y field components are a result of multipath effects.
 
 
<table>
<tr>
<td>
[[Image:PROP256.png|thumb|380px|The distribution of the X-component of electric field due to the vertically polarized dipole source.]]
</td>
<td>
[[Image:PROP257.png|thumb|380px|The distribution of the Y-component of electric field due to the vertically polarized dipole source.]]
</td>
<td>
[[Image:PROP258.png|thumb|380px|The distribution of the Z-component of electric field due to the vertically polarized dipole source.]]
</td>
</tr>
Kazem Sabet
28,333
edits