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Figure 1: [[FDTD Module]]'s Waveguide Source dialog.

Waveguide sources are a special case of distributed sources in EM.Cube's [[FDTD Module]]. A Distributed Source is defined in a rectangular plane of finite extents, parallel to one of the three principal coordinate planes. An impressed electric field component is assumed across the specified rectangular area, which pumps energy into the computational domain. The current version of EM.Cube provides three spatial field profiles for a distributed source:

* In the '''Excitation Plane''' section of the dialog, first you have to select the orientation of the source plane. The dropdown list labeled '''Direction''' gives three options: '''X, Y''' and '''Z''', which create planes parallel to the YZ, ZX and XY principal planes, respectively. Depending on the choice of the plane orientation, another dropdown list labeled '''Field Dir''' gives four options for the direction of the source field component. For example, the default plane orientation is X (parallel to the YZ-Plane) and the available field directions are +Y, -Y, +Z and -Z. Next, you have to enter the coordinates of two opposite corners of the source plane: the lower left and upper right corners. You can type in values for the X, Y, Z coordinates or you can use the spin buttons to slide the default source planes in the Project Workspace.

* In the '''Source Properties''' section, you can select the '''Profile''' from three options: '''Uniform''', '''Sinusoidal''' and '''Edge-Singular'''. You can also specify the source '''Amplitude''' in Volts, and '''Phase''' in Degrees and the source's internal '''Resistance '''in Ohms .

[[Image:fdtd_src7_tn.png]]