Changes

EM.Tempo

1,191 bytes added, 14:07, 7 August 2019
| style="width:300px;" | Modeling ferrites and magnetoplasmas
| style="width:250px;" | Solid objects
|-
| style="width:30px;" | [[File:Virt_group_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Virtual_Object_Group | Virtual Object]]
| style="width:300px;" | Used for representing non-physical items
| style="width:250px;" | All types of objects
|}
</table>
=== Advanced CMPL CPML Setup ===
In open-boundary electromagnetic modeling problems, you need a boundary condition that simply absorbs all the incoming radiation. For problems of this nature, an absorbing boundary condition (ABC) is often chosen that effectively minimizes wave reflections at the boundary. [[EM.Tempo]] uses Convolutional Perfectly Matched Layers (CPML) for absorbing boundary conditions. Usually two or more ABC layers must be placed at the boundaries of the physical structure to maximize wave absorption. The boundary CPML cells in the project workspace are not visible to the user. But, in effect, multiple rows of CPML cells are placed on the exterior side of each face of the visible domain box.
A sinusoidal waveform is single-tone and periodic. Its spectrum is concentrated around a single frequency, which is equal to your project's center frequency. A Gaussian pulse decays exponentially as t &rarr; &infin;, but it has a lowpass frequency spectrum which is concentrated around f = 0. A modulated Gaussian pulse decays exponentially as t &rarr; &infin;, and it has a bandpass frequency spectrum concentrated around your project's center frequency. For most practical problems, a modulated Gaussian pulse waveform with EM.Tempo's default parameters provides an adequate performance.
The accuracy of the FDTD simulation results depends on the right choice of temporal waveform. [[EM.Tempo]]'s default waveform choice is a modulated Gaussian pulse. At the end of an FDTD simulation, the time domain field data are transformed into the frequency domain at your specified frequency or bandwidth to produce the desired observables.
{{Note|All of [[EM.Tempo]]'s excitation sources have a default modulated Gaussian pulse waveform unless you change them.}}
[[Image:Info_icon.png|30px]] Click here to learn more about EM.Tempo's '''[[Basic_Principles_of_The_Finite_Difference_Time_Domain_Method#The_Relationship_Between_Excitation_Waveform_and_Frequency-Domain_Characteristics | Standard & Custom Waveforms and Discrete Fourier Transforms]]'''.
| style="width:300px;" | Computing either total electric or total magnetic field distribution on a planar cross section of the computational domain in the time domain
| style="width:250px;" | The field maps are generated at certain specified time intervals
|-
| style="width:30px;" | [[File:farfield_icon.png]]
| style="width:150px;" | Far-Field Radiation Patterns
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Far-Field_Radiation_Pattern_Observable |Far-Field Radiation Pattern]]
| style="width:300px;" | Computing the 3D radiation pattern in spherical coordinates
| style="width:250px;" | Requires one of these source types: lumped, distributed, microstrip, CPW, coaxial or waveguide port
|-
| style="width:30px;" | [[File:farfield_icon.png]]
| style="width:150px;" | Far-Field Radiation Characteristics
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Far-Field_Radiation_Pattern_Observable |Far-Field Radiation Pattern]]
| style="width:300px;" | Computing the 3D radiation pattern in spherical coordinates and additional radiation characteristics such as directivity, axial ratio, side lobe levels, etc.
| style="width:250px;" | Requires one of these source types: lumped, distributed, microstrip, CPW, coaxial or waveguide port
|-
| style="width:30px;" | [[File:farfield_icon.png]]
| style="width:150px;" | Far-Field Scattering CharacteristicsPatterns
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Far-Field_Radiation_Pattern_Observable |Far-Field Radiation Pattern]]
| style="width:300px;" | Computing the 3D scattering pattern in spherical coordinates
| style="width:250px;" | Requires a plane wave or Gaussian beam source
|-
| style="width:30px;" | [[File:rcs_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Radar_Cross_Section_(RCS)_Observable | RCS]]
| style="width:300px;" | Computing the bistatic and monostatic RCS of a target
| style="width:250px;" | Requires a plane wave source
|-
| style="width:30px;" | [[File:rcs_icon.png]]
| style="width:150px;" | Polarimetric Scattering Matrix Data
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Radar_Cross_Section_(RCS)_Observable | RCS]]
| style="width:300px;" | Computing the scattering matrix of a target for various plane wave source incident angles
| style="width:250px;" | Requires a plane wave source
|-
<table>
<tr>
<td> [[Image:FDTD_FF1.png|thumb|left|770px720px|EM.Tempo's Radiation Pattern dialog.]] </td>
</tr>
<tr>
<td> [[Image:FDTD_FF3.png|thumb|left|480px600px|EM.Tempo's Radar Cross Section dialog.]] </td>
</tr>
</table>
<tr>
<td> [[Image:Period1.png|thumb|350px|Setting periodic scan angles in EM.Tempo's Lumped Source dialog.]] </td>
</tr></tr></table> <table><tr><tr><td> [[Image:Period2.png|thumb|350px720px|Setting the array factor in EM.Tempo's Radiation Pattern dialog.]] </td>
</tr>
</table>
4,622
edits