Drawing an Infinite Array

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Layout Editor User Guide >
Drawing a Model >
Drawing Geometric Objects >
Drawing an Infinite Array

Designer can model infinite, periodic structures where geometry drawn in a “unit cell” is repeated infinitely in the x and y directions. If you excite the infinite array with an edge port, the excitation will radiate into free space. If you excite the array with a plane wave, the structure will act as a frequency-selective surface (FSS) or filter receiving the excitation.

1. Right click on the design in the project tree and select Infinite Array.

2. The array is drawn using a rectangular unit cell. Select the center point of the unit cell by typing its coordinates in the X and Y text boxes.

3. Specify the dimensions of the unit cell by typing its width in the a text box and its height in the b text box.

• Alternatively, click Autosize to give the rectangle the same dimensions as the model geometry.

Note

You may draw geometry outside the unit cell. The mesh will automatically be generated in a way that assures current continuity across the boundaries of the unit cell.

4. Select Turn on infinite array/FSS to activate the array in the project.

The array is stored with the project, whether or not it is active.

5. Type a Skew Angle (gamma) that represents how the array lattice is repeated between rows of cells.

6. If the infinitely periodic structure represents an infinite array, type the array’s Scan Angle values in the Theta and Phi text boxes.

The scan angle determines how the different cells of the array are excited periodically. Theta is the angle measured from the z-axis, which is the axis perpendicular to the plane of the work space, and must be from 0 to 180 degrees. Phi is the angle measured from the x-axis and can be from 0 to 360 degrees.

If the periodic structure represents an FSS filter, these values are not necessary. The incident angle of the plane wave is defined in the Setup Plane Wave Excitation dialog box.

Note

The solution will be invalid when an incident angle for FSS is close to 90 degrees. As a result, the solver will indicate an invalid field for any angle that is between 88 and 92 degrees.

7. Select a display color for the array.

8. Click OK.

The rectangular structure you drew and its associated excitation will be repeated infinitely.


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Drawing an Infinite Array

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