CST – Computer Simulation Technology

Linear Array Endfire Directivity or Beamwidth


This synthesis algorithm will design a linear array for a specified directivity or beamwidth. The array is always designed so that the elements are arranged along the x-axis, with the main lobe of the resulting pattern a body of rotation about the x-axis, with the peak directivity in the +x direction.

1 An example of a 3D pattern for this array.

The inter element spacing is always 0.49 λ when this design algorithm is used. If a directivity of less than 20dB, or a beamwidth of greater than 20°, is specified, all the side-lobes will be equal and -20dB below the main beam directivity [Dolph-Chebychev excitation taper]. For higher gain designs, the first 5 side lobes will be -20dB below the main beam directivity [Villeneuve excitation taper]. The specification of the scanangle will introduce an inter element phase offset in the excitation....

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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