Changes

[[EM.Picasso]] allows you to steer or scan the beam of a periodic antenna array in any Theta and Phi direction. In [[EM.Picasso]], you can do this with periodic strip and probe gap sources through their property dialog. Open the property dialog of the probe source "PS_1". At the bottom of this dialog, click the button labeled {{key|Periodic Scan Angles...}}. In the scan angles Periodic Scan Angles dialog, you can enter values for "Scan Theta(deg)" and "Scan Phi(deg)" in degrees. Their default values are zero. This means that by default there is no phase progression among the elements of the infinite periodic array.

In order to steer the array beam to θ = φ = +45°, you need phase progressions equal to Ψ_x = Ψ_y = -90° that is equal phase progression along both X and Y directions. Enter a value of 45 degrees for both Scan "Theta (deg)" and Scan "Phi (deg) in the scan angles Periodic Scan Angles dialog and return to the probe source dialog.

[[Image:Tempo_L4_Fig7A_newPicasso_L5_dBunit.png|thumb|left|600px|The output plot settings dialog.]]

Just as you can steer the beam of an infinite periodic array, you can also steer the beam of a finite-sized antenna array. This can be done from the source array dialog. Open the property dialog of the source array "PS_1" and click the button labeled {{key|Array Weights...}}. Change the '''Weight Distribution''' back to the '''Uniform''' type. At the bottom of this dialog, you will see zero default values for the "Phase Progression" along the X, Y and Z directions. In the case of beam steering, your planar array's elements must have a nonzero phase progression along the X and Y directions. Earlier you found that to steer the beam of the array to θ = φ = 45°, you need equal phase progressions of -90° along both X and Y directions. Enter a value of -90 in the respective boxes of the source array dialog.