Changes

===Ideal Source===

An ideal source acts as a voltage source in series with an internal resistance that can be placed between any two adjacent mesh grid nodes anywhere in the computational domain. The ideal source is displayed as a small orange arrow in the project workspace. By default, [[EM.Tempo]] creates a +Z-directed ideal source located at the origin of coordinates (0, 0, 0). You can change the direction of the ideal source to ±X, ±Y or ±Z.

[[File:FDTD55.png|thumb|left|250px|]]

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You can change the characteristic impedance of a port by selecting it from the Port List and clicking the '''Edit '''button of the dialog. This opens up the Edit Port dialog, where you can enter a new value in the box labeled '''Impedance'''.

Using simple lumped sources, you can simulate a variety of transmission line structures in [[EM.Tempo]] including filters, couplers or antenna feeds and you can calculate their scattering [[parameters]]. This approach may become less accurate at very high frequencies when the details of the feed structures become important and can no longer be modeled with highly localized lumped ports. In such cases, it is recommended to use “Distributed Sources”, which utilize accurate modal field distributions at the ports for calculation of the incident and reflected waves.

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[[Image:FDTD46.png|thumb|250px|[[FDTD Module]]'s Plane Wave dialog]]

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