CST – Computer Simulation Technology

Planar Array Broadside Null with Specific Directivity

1

This synthesis algorithm will design a planar null array for a specified directivity and excitation taper. The excitation taper is used to control the side-lobe level and distribution. 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 0.5 λ, with an equal number of radiators in the x- and y-direction. The excitation per element is determined by the relative placement of the element on a Bayliss curve between the center (origin) and the maximum outer radius of the array.

The excitation taper may be set to equal excitation [Uniform], or near-in side-lobes at quasi-uniform specified level [Bayliss]. The side-lobe level and number of side lobes (where applicable) can then be set, although it should be noted that the nature of the design makes this specification difficult to control. The results may often not be as specified....

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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