Electric field bounds over a phased array aperture

In the following, a bound on the electric field magnitude existing over a phased array antenna is presented. Use of this bound in predicting the power handling capability of the array is discussed. It is shown that, although the overall array is large with respect to wavelength, the narrow beamwidth often required significantly affects the near field over the aperture and just outside the antenna. The result is compared to a previously existing bound obtained for a single rectangular aperture.