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Array Design 

The four planar phased array configurations that can be handled by APAS are shown below.  The elements may be grouped across the array aperture using a rectangular or a triangular element grid.  

 Phased Array Configurations that can be handled by APASPhased Array Configurations that can be handled by APAS

Starting a new array design is quite simple and involves the invoking of only three input dialog boxes namely, Input Apertue Data, for entering aperture data, TRM/TDU for inputting all T/R module data and optional TDU data. The third input dialog for specifying a new array design is the taper input dialog box Tapers. With this input dialog box specification data for up to four different tapers can be inputted: two sum tapers one for transmit and the other for receive and two difference tapers both on receive. This is all what is required to specify a new array design.

After the array design data has been inputted by the user to APAS, the 2-D far-field calculation of this design can be started by invoking the input Operation dialog box.  All these four input data operations can be performed with a minute. 

With a state-of-the art PC equipped with an AMD Ryzen 9 3900x processor @ 3.8 GHz and 32 GB RAM a 2-D far-field calculation using a 513 x 53 resolution requires only 0.04 seconds computational time. This is including the time for calculating the antenna directivity, the exact beam pointing position, the 3 dB beamwidth in both main planes as well as the peak and average sidelobe level and main beam efficiency.

APAS Input Dialog Boxes Gallery

The array antenna design in the above gallery refers to a circular aperture populated by 2066 array elements arranged in a triangular grid. The used radiating elements are of the open ended waveguide type. The far-field calculation takes the mutual coupling between all elements into account. From the last two figures in the gallery one can see that mutual coupling hardly does affect the peak sidelobe behavior even for extreme low sidelobes.  The used taper was synthesized for a -60 dB peak sidelobe level  in combination with a sharp monotonic decay of the peaks.