Changes

==Mesh GenerationRunning the Wire MoM Simulation==

[[Image:WMOM8MOMTUT3 13.png|thumb|400px350px|The Mesh Settings dialog.]][[EM.Cube]] has several types of mesh generators that are used to discretize the physical structure for the numerical solution of [[MaxwellLibera's Equations|Maxwell's equations]]. [[EM.Cube]]'s [[MoM3D Module]] has two mesh generators: one for the Run dialog with Wire MoM solver and the other for the Surface MoM solverSingle-Frequency Analysis selected. The Wire MoM mesh generator discretizes line objects into a number of linear cells. It converts [[Curve Objects|curve objects]] first into polylines and then subdivides each side of At this time, your project is ready for the resulting polylines. The Wire MoM mesh generator creates a wireframe version simulation of surface and [[Solid Objects|solid objects]]. The wireframe your dipole antenna structure indeed consists of a set of interconnected wire segments. The current continuity is enforced at the joint shared among several interconnected For wire segments. The Surface MoM mesh generatorstructures, on the other hand, creates a triangular surface mesh of surface and [[Solid Objects|solid objects]]EM. It ignores any line or [[Curve Objects|curve objectsLibera]].  You can control the mesh resolution in two ways. The first method is to set the "Mesh Density" in the form of the number of cells per wavelength. In this case, your mesh will be frequency dependent. For example, if you set the mesh density to 10 cells per wavelength, the number of cells on generates a line object of fixed length will increase as the frequency increases. At an operational frequency of 1GHz, the wavelength is 300mm. Therefore, with this wireframe mesh density, you will have a total of 5 cells across your 150mm long dipole antenna. Now consider an operational frequency of 2GHz with a corresponding free-space wavelength of 150mm. With the same mesh density, It automatically detects whether your dipole antenna will have 10 cells at 2GHz. The second method of controlling the mesh is by setting physical structure requires a fixed "Edge Length" for the surface mesh cells. The edge length is set in the project units. A mesh of this kind will be frequency-independent. By default, the "Mesh Resolution" is set in terms of "Density" with or a default value of 10 cells per wavelength.   The wireframe mesh properties can be accessed by clicking the <b>Mesh Settings</b> [[Image:fdtd_meshsettings.png]] button of Open the Simulate Toolbar (or using the keyboard shortcut <b>Ctrl+G</b> or via the menu <b>Simulate &rarr; Discretization &rarr; Mesh Settings</b>). For this tutorial, set Dialog and change the mesh type to "Wire MoM value of '''Mesh", keep the default "Density" option and set its value ''' to 30 cells per wavelength. In this case, at 1GHz your dipole antenna will have 15 cells across it.

To view the mesh, click Click the <b>Show/Generate MeshRun</b> [[Image:fdtd_meshshowfdtd_runb.png]] button Button of the Simulate Toolbar (or alternatively use to open up the keyboard shortcut <b>Ctrl+M</b>)Simulation Run Dialog. For this particular project, You will see that the mesh view does not reveal much because the mesh of a vertical line object conforms "Simulation Engine Type" is automatically set to wire itself. In general, the mesh view shows how the simulation engine sees your physical structure"Wire MoM Solver".

Project observables are output quantities that you would like to compute at the end of an FDTD Run a MoM simulationof your dipole antenna. By defaultOnce the simulation is complete, the Wire MoM solver does not generate any output data unless you define one or more project observables before you start a simulation. window will report the calculated S, Z and Y parameters:

Current distribution observables are used to visualize the linear currents on the wires or wireframe structures. To define a current distribution observable, right click on the <b>Current Distributions</b> item in the “Observables” section of the Navigation Tree and select <b>Insert New Observable…</b> This opens up the Current Distribution Dialog. Keep all the default options and close the dialog. A new entry CD_1 is added to the Navigation TreeS11(dB): -8.581999

To plot the radiation patterns of a radiating structure, you need to define a far field observableZ11: 77. To define a far field observable, right click on the <b>Far Fields</b> item in the <b>Observables</b> section of the Navigation Tree, and select <b>Insert New Radiation Pattern…</b> In general, you can accept the default values, unless a special case is being analyzed464068 +41. 698638j