  In this paper, we propose quantifying the radiated power of phased arrays or,
in general, directive antennas, by the Constrained-View Radiated Power (CVRP).
The constrained view shall be interpreted here as the Field-of-View (FoV) of an
antenna that defines a region in space where focusing the radiated power is
highly desired. In the limiting cases, we have that CVRP equals the Total
Radiated Power (TRP) when the FoV covers the whole sphere, while, if the FoV
reduces to a single point in space, the CVRP equals the Equivalent Isotropic
Radiated Power (EIRP). We further present an analysis based on measured
radiation patterns of a 16-element, linearly polarized, millimeter-Wave
(mmWave), planar phased array antenna operating at 28 GHz. We compare the
results to two ideal planar array antennas with the same number of Huygens and
cosine elements. The evaluated figure of merit is computed for different
scanning angles, as well as for different malfunctions of antenna elements,
both for the real and simulated arrays. The results show that the introduced
figure of merit could be potentially used for the detection of malfunctioning
elements in antenna arrays as well as to characterize the impact of scan loss.
Furthermore, CVRP is useful to straightforwardly and significantly characterize
the performance of a directive antenna in terms of the power radiated towards a
specific region in space.
