Changes
/* Short Dipole Sources */
=== Short Dipole Sources ===
[[File:PMOM110.png|thumb|Short Dipole Source dialog]]
A short dipole is the simplest type of radiator, which consists of a short current element of length Δl, aligned along a unit vector รป and carrying a current of I Amperes. The product IΔl is often called the dipole moment and gives a measure of the radiator's strength. A short dipole in the free space generates an azimuth-symmetric, almost omni-directional, far field. However, the radiated fields of a short dipole above a layered planar background structure are greatly altered by the presence of the substrate layers. Note that the electric and magnetic field radiated by a short dipole in the presence of a layered background structure are indeed nothing but the dyadic Green's functions of that structure:
:<math> E^{inc}(r) = \int_{\Delta_L} \overline{\overline{G_{EJ}}}(r|r') \cdot (I\Delta l \hat{u}) \, dl' </math>:<math> H^{inc}(r) = \int_{\Delta_L} \overline{\overline{G_{HJ}}}(r|r') \cdot (I\Delta l \hat{u}) \, dl' </math><!--[[File:PMOM109(1).png]]-->
To define a short dipole source, follow these steps:
* Right click on the '''Short Dipoles''' item in the '''Sources''' section of the Navigation Tree and select '''Insert New Source...''' The Short Dipole Dialog opens up.
* In the section titled '''Source Location''', enter values for the X, Y and Z coordinates of the dipole's center. By default, a new dipole is placed at the origin of coordinates. As you change the coordinates using the spin buttons, you will see the dipole move in the project workspace.
* In the section titled '''Source Properties''', you can change the values of the dipole's '''Amplitude'''(in A), '''Phase'''(in degrees) and '''Length''' in the project's length units. A new dipole, by default, is Z-directed. You can change its orientation by entering the components of its unit vector in the three boxes labeled '''Direction Unit Vector'''. [[File:PMOM110.png]] Figure 1: [[Planar Module]]'s Short Dipole Source dialog.
=== Plane Wave Sources ===
