|}
The dimensions of the constituent objects have been parameterized. Open the variables dialog to see a list of the variables and their definitions. The initial value of the variable "sub_size" is 92.3976. This indicates the dielectric substrate is 92.3976mm × 92.3976mm × 1.5mm. Click the Edit button of the dialog to open the Edit Variable dialog. Replace this value by 150 in the box labeled Definition. Close this dialog to return to the variable dialog and check out the new value you just changed.
<table>
</tr>
</table>
<table>
<tr>
<td> [[Image:Tempo_L3_Fig3_150mm.png|thumb|480px|Editing variable called "sub_size".]] </td>
</tr>
</table>
You can also see from the variables dialog that the dielectric substrate (represented by a box of dimensions 150mm × 150mm × 1.5mm) has a relative permittivity ε<sub>r</sub> = 2.2 and a thickness h = 1.5mm. A short vertical line called "Feed" is placed underneath the patch and is completely embedded in the substrate. This line object serves as the probe feed of the patch antenna and is associated with a lumped source called "LS_1". There is also a far-field radiation pattern observable with the default theta and phi angle increments of 5° as well as a port definition with a reference port impedance of 50Ω. Also, note that the metallic patch is a square with its side dimensions set equal to len = 0.48λ<sub>d</sub>, where λ<sub>d</sub> is the effective dielectric wavelength.
<table>
<tr>
<td> [[Image:Tempo_L3_Fig3next.png|thumb|480px|EM.Tempo's variables dialog.]] </td>
</tr>
</table>
== Defining a Near-Field Sensor Observable ==