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GEMS Quick Start Examples |
| Quick Start Guide | Examples 1-5 | 6-10 | 11-15 | 16-20 | 21-25 | |
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| Modeling |
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Support SAT, STEP, IGES, ProE, Catia (optional), Voxel or DXF file. |
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Object drawing order is important if a project model includes the infinitely thin PEC surfaces. |
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Always use the rectangular shaped objects if the cross section is not critical. |
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Use a bigger structure if the object size is not important, specially, for the feed structures. |
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If a ground is infinitely large, has no thickness and the objects are only located at one side of the ground plane, you can use the “Perfect E Boundary” as the ground. |
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Excitation |
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“Lumped port” (including an internal resistance) is for an open port that requires a match load. |
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“Wave port” is for a port that is already matched by a match load or by the “Open Boundary(touched)”. |
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Both rectangular and circular waveguides are excited using the “Analytic” “TE” or “TM” mode |
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Coaxial cable is excited using the “Numerical” “TEM” mode |
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“Numerical” “TE” or “TM” or “TEM” is for general waveguide structures. |
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A coaxial feed model, in most cases, can be simplified to be a lumped port. |
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A lumped port should use 2 to 3 cell space. A probe can be added to reduce the feed gap size if the gap is too large. |
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If a model fed by a Coplanar Waveguide (CPW) structure is symmetric, you only need to simulate the half model using “Perfect H Boundary”. The half CPW is excited by using a lumped port. For an asymmetric model, you can extend and close the ground to get one port structure, and then use a lumped port to excite it. |
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A plane wave source is for the scattering problems. |
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“Gaussian Beam” source, which is realized by setting the plane wave and boundary, is for special purpose. |
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A PBC plane wave is only for the EBG or FSS structures. |
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A customized field distribution, “Planar source”, such as a special or cylindrical wave can be used as an excitation source for the special purpose. |
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Boundary |
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“Open Boundary(add space)” is used to truncate the model with a finite size structure. Its function is just like the absorbing wall inside the microwave chamber. |
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“Open Boundary(touched)” is used to truncate a structure that is extended to infinity, or a port that has been matched at the infinity. However, we only need to include its small part inside the simulation region; namely, “Open Boundary(touched)” is the best match load. |
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“PBC” is used to truncate the EBG, FSS or other periodic structures. |
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| Output |
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“Lumped port” returns the S-parameter, impedance, and, voltage and current of the open port. |
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“Wave port” returns the S-parameter, impedance, and, voltage and current of the matched port. |
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“Mode port” returns the S-parameter, mode impedance, and, mode voltage and current of the waveguide port. |
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Draw a dot to output the field at a point. |
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Draw a 1D line segment for the voltage output. |
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Draw a 2D surface for the current, field or current distribution, or transmitted power output. |
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Draw a 3D box for the transmitted power output. |
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Draw a 3D volume for the SAR, thermal energy, or surface current output. |
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Far fields, efficiency, MEG, ECC and RCS outputs are specified through Huygens’s surface. |
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Mesh |
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If “Lookup minSize” cannot find the proper “minSize” value, adjust the mesh options to find again. Click on the “Mesh” button to generate the adaptive mesh distribution. |
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Specify the half size of fine structure of interest as the minimum cell size in the “minSize” box, and then click on the “Mesh” button to generate the adaptive mesh distribution. |
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Use the key points to force the mesh passing the special points on the model. |
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Download Example Guide |
Download Project Files only |
Download Project Files with Results |
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GEMS Quick Start Examples |
| Quick Start Guide | Examples 1-5 | 6-10 | 11-15 | 16-20 | 21-25 | |
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