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Band-Pass Filter Comparison:
This example shows a band-pass filter simulated using three different technologies within MWO. The filter is designed using conventional models, EM-based models (XModels), and EM Extraction to produce an actual EM simulation. As the "Return Loss" and "Transmission" plots show, the XModel design offers greater accuracy over conventional models similar to those used in other simulators.
The Output Equation document "Report" uses a docset element to easily setup the results for this analysis. See the text boxes in the document to learn how to control the data report.
XModels Versus Traditional Models
Traditional closed form distributed models were developed to be usable over a wide range of parameter values (like line width, substrate height, substrate relative permittivity for a microstrip line). These models make a tradeoff in accuracy for a wide range of parameters where they are accurate. When doing a design, the substrate characteristics are fixed. The XModels create a model specific for a particular substrate and are extremely accurate. These models are created using the built-in EM simulator of Microwave Office which allows new substrate models to easily be created.
For further help on the use of X-Models, and how they are generated, please review the Users Guide on EM-Based Discontinuity Models.
EM Extraction was used to produce EM structure "Extraction_Using_Traditional_Models". When you simulate the project as given, you can see the results of an actual EM simulation and compare those to the results from schematics "Traditional_Models" and "X_Models". To watch the actual EM Extraction process, simply delete EM structure "Extraction_Using_Traditional_Models" and re-simulate the project. Note that it will take a few minutes to perform the EM Extraction.
For further help on the use of EM Extraction, please review the Users Guide on Creating EM Structures with Extraction.