CST – Computer Simulation Technology

Planar Array Broadside Directivity or Beamwidth

1

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.

1 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 ‘ Antenna Array Synthesis in Antenna Magus’ and in ‘ Help: How do I use the Array Synthesis tool?’ (located in the Antenna Magus information browser). The latter article also describes the different excitation tapers in more detail, and provides references for further research.

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