<td>
[[Image:Lumped MAN1.png|thumb|left|480px|The lumped device dialog with the resistor type selected.]]
</td>
</tr>
</table>
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== Scattering Wave Port ==
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ICON: [[File:waveport_src_icon.png]]
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MODULE: [[EM.Picasso]]
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FUNCTION: Creates an infinitesimal gap across a PEC rectangle strip object at a specified location and places an ideal voltage source with a series internal resistor
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TO DEFINE A SCATTERING WAVE PORT:
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# Right-click on the '''Scattering Wave Ports''' item in the navigation tree.
# Select '''Insert New Source...''' to open up the Wave Port Dialog.
# From the '''Host''' drop-down list, select a PEC rectangle strip object.
# By default, the wave port is placed at one end of the host rect strip object. The incident wave propagates along the host strip towards this end. You can change the direction of the incident wave. You can also modify the '''Offset''' parameter, which is measured from the endpoint of the host strip. This establishes the phase reference plane for computation of the scattering parameters.
# Click the '''OK''' button of the dialog to return to the project workspace.
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NOTES, SPECIAL CASES OR EXCEPTIONS: A scattering wave port is made up of a gap source that is placed close to an open end of a rectangle strip representing a feed line. The other end of the line is typically connected to a planar structure of interest. in the process of planar mesh generation, [[EM.Picasso]] automatically extends the length of a port line that hosts a scattering wave port to about two effective wavelengths. This is done to provide enough length for formation of a clean standing wave current pattern. The effective wavelength of a transmission line for length extension purposes is calculated in a similar manner as for the planar mesh resolution. It is defined as <math>\lambda_{eff} = \tfrac{\lambda_0}{\sqrt{\varepsilon_{eff}}}</math>, where ε<sub>eff</sub> is the effective permittivity. For metal and conductive sheet traces, the effective permittivity is defined as the larger of the permittivities of the two substrate layers just above and below the metallic trace. For slot traces, the effective permittivity is defined as the mean (average) of the permittivities of the two substrate layers just above and below the metallic trace. The host port line must always be open from one end to allow for its length extension. You have to make sure that there are no objects standing on the way of the extended port line to avoid any unwanted overlaps.
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PYTHON COMMAND: wave_port(label,rect_object,offset,is_negative[,amplitude,phase])
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SCATTERING WAVE PORT PARAMETERS
{| class="wikitable"
|-
! scope="col"| Parameter Name
! scope="col"| Value Type
! scope="col"| Units
! scope="col"| Default Value
! scope="col"| Notes
|-
! scope="row" | direction
| List: pos, neg
| -
| pos
| direction of the incident wave
|-
! scope="row" | offset
| real numeric
| project units
| 0
| distance between the source and the endpoint of the host strip object
|-
! scope="row" | amplitude
| real numeric
| Volts
| 1
| amplitude of incident wave
|-
! scope="row" | phase
| real numeric
| degrees
| 0
| phase of incident wave
|}
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RELATED LINKS:
[[Preparing_Physical_Structures_for_Electromagnetic_Simulation#Calculating_Scattering_Parameters_Using_Prony.27s_Method | Calculating Scattering Parameters Using Prony's Method]]
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<table>
<tr>
<td>
[[Image:Picasso L1 Fig12.png|thumb|left|480px|The scattering wave port source dialog.]]
</td>
</tr>