graph the simulation results.
===<u>We strongly recommend that you read through the first few tutorials and study them carefully before setting up your own projects.===</u>
==1.3 Creating a Wire Object==
Line).
 Select the Line Tool from the Object Toolbar (or use the keyboard shortcut <b>F3</b>, or the menu <b>Object ï → Curve → Line<b>). ï
[[Image:fdtd_lec1_7_toolbarline.png|center]]
With the line tool selected, click the origin (0,0,0), and drag the mouse to start drawing a line. While still in âDraw Modeâ, press and hold the <b>Alt </b> button of the keyboard. This forces the drawn line to be constrained along the alternate Z-axis (normal to the default XY plane on which the mouse pointer moves). Observe the changing Length value in the dialog box as you drag the mouse back and forth. When the length reaches a value of 150 units, left-click to âlock-inâ the value. You may also left-click at any point and adjust the length by typing in a value of 150 in the objectâs property dialog. Â
[Image:fdtd_lec1_8_lineproprerties.png]]
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Since the center frequency of the project is 1GHz, the operating wavelength is:
[Image:fdtd_lec1_wavelength.png|center]]
[[Image:fdtd_lec1_9_nevigationtree.png|350x|right]] For your resonant dipole to be half-wave, it can be approximated at 150mm.
Once your drawing is complete<u>If you have a mouse with a scroll wheel, you can zoom use the scroll wheel to fit your stucture into zoom in or zoom out while you draw the screen line. You can also rotate the view using the keyboard shortcut Ctrl+E or by clicking the Zoom Extents right mouse button of View Toolbar. After you have rotated , or panned pan the view, you can always restore EM.Cubeâs standard perspective view using the right mouse button while holding the keyboardâs Home Shift Key or by clicking the Perspective View button of View Toolbardown. </u>
Once your drawing is complete, you can zoom to fit your stucture into the screen using the keyboard shortcut <b>Ctrl+E</b> or by clicking the Zoom Extents [Image:fdtd_zoomextents.png]] button of View Toolbar. After you have rotated or panned the view, you can always restore EM.Cubeâs standard perspective view using the keyboardâs <b>Home Key</b> or by clicking the <b>Perspective View</b> [Image:fdtd_perspective.png]] button of View Toolbar. Â In EM.Cubeâs [[FDTD Module]], objects are grouped together and organized by material under the âPhysical Structureâ node of the Naviation Tree. Since you selected no material for your line object, the first drawn object is automatically assigned a <i>PEC_1 </i> material group. The default perfect electric conductor (PEC) group is set as the active material. When a material group is set as active, its name appears in bold letters, and all subsequently drawn objects will be placed under that material node. Any material group can be set as the active material by right-clicking on its name in the Navigation Tree and selecting <b>Activate </b> from the contextual menu.
==1.4 omputational Domain & Boundary Conditions==
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As soon as you draw your first object in [[FDTD Module]]âs project workspace, a blue wireframe box appears which completely encloses your object. This is [[FDTD Module]]âs computational domain box. Since FDTD is a finite-domain numerical technique, it requires a computational domain of finite extents. By default, the domain box is placed a quarter free space wavelength from the largest bounding box of your physical structure. You can confirm this by opening the Domain Settings Dialog. Click the Domain Settings button of Simulate Toolbar (or select the menu item Compute ï Computational Domain ï Domain Settings⦠or use the keyboard shortcut Ctrl+A) to bring up the domain dialog box. For the default domain type, the domain size is specified in terms of offsets along the ±X, ±Y, and ±Z directions, i.e., the distances between the largest bounding box of the geometry and all the six domain boundaries. The offsets are expressed in free space wavelengths calculated at the highest frequency of the project, which is fmax = f0 + ïf/2, where f0 is the center frequency of the project and ïf is the bandwidth.