Planar: Broadside directivity or beamwidth

This synthesis algorithm will design a planar array for a specified directivity or beamwidth. The array is always designed so that the elements are arranged in the x-y plane, centered on the z-axis, resulting in a bi-directional beam along the positive and negative z-axis.

An example of a 3D pattern for this array.

When this design algorithm is used, the inter element spacing is always 0.45 λ, with an equal number of radiators in the x- and y-direction when gain is specified, and a different number of radiators in the x- and y-direction when different 3dB beamwidths are specified in the x- and y-plane. The excitation per element is the product of two linear array excitations, one laid out along the x-axis and the other laid out along the y-axis. If a directivity of less than 20dB, or a beamwidth of greater than 20 °, is specified, the side-lobes per linear excitation are designed for -20dB below the main beam directivity [Dolph-Chebychev excitation taper]. For higher gain designs, each linear excitation is designed to have the first 5 side lobes -20dB below the main beam directivity [Villeneuve excitation taper].

More information about how the array synthesis tool should be used can be found in the array article in the information browser. This article also describes the different excitation tapers in more detail, and provides references for further research.