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Design Notes

Phased Array

This project shows how VSS can be used to model and analyze phased arrays. In this example, the individual elements of the phased array are assumed to be patch antennas with radiation pattern defined in the Patch_Antenna_Elem data file. The latter was created using an EM simulation and the AntPat_TPwrF data file measurement.

In "Antenna pattern" system diagram an ANTENNA block is used to show the radiation pattern of individual elements. This block is driven with a tone signal and the angle off the boresight (THETA) and azimuth angle (PHI) are swept.  The antenna element gain is calculated as a function of the THETA and PHI angles. 

The PHARRAY_ANT blocks illustrate how to model a rectangular phased array; in this case the array is of size NxM (15x5), with elements spaced at half wavelength.  The standard array geometry option allows configuration of rectangular or triangular arrays using parameters dx, dy and g. 

A Chebychev gain taper with side lobe ratio of 40dB is used in this example to shape the array response vs. angle off boresight.

The first PHARRAY_ANT block assumes isotropic antenna elements, while the second one uses the radiation pattern defined in the Patch_Antenna_Elem data file. The results are plotten side by side to see to illustrate the effect of the element radiation pattern in the overall phased array response.

The antenna 3dB beam width is also calculated using Output Equations.