Get Directivity Values From phased.URA

I've created an array using the phased URA tool, & the 3d plot it produced matches well with what I am expecting.

I was wondering how I can get the directivity(dBi) values, ie. z-axis values, from the URA object. Is it possible to create a matrix of these values?

Below is the code used to construct the URA.

sar_array = phased.URA;
sar_array.Size = [10 10];   %number of array elements
sar_array.ElementSpacing = [0.9 0.9];   %element spacing
sar_array.Lattice = 'Rectangular';  %rectangular array 
sar_array.ArrayNormal = 'x';

el = phased.IsotropicAntennaElement;
sar_array.Element = el;

F = 300000000;
PS = physconst('LightSpeed');
fmt = 'rectangular';
fig = figure;

pattern(sar_array, F(1), 'PropagationSpeed', PS, 'Type','directivity', ...
    'CoordinateSystem', fmt);

Answer 1

[Honglei Chen]

If you want directivity values for all angles, you can just simply do

D = pattern(sar_array, F(1), 'PropagationSpeed', PS, 'Type','directivity', ...
    'CoordinateSystem', fmt);

If you want directivity in only several points, say 0 and 30 degrees azimuth, then you can save some computation by doing

D = directivity(sar_array, F(1), [0 30])

HTH