calculate phase shift for circular planar array

I need to first make a circular planar array and then find its phase shifts.

[darova]

Do you have a picture? I don't understand the question

[rafay hayat]

Circular planar array can be made using

N = 20;   % Number of elements on each row/column of rectangular array
dy = 0.5; % Spacing between elements on each row (m)
dz = 0.5; % Spacing between elements on each column (m)
R = 4.5;  % Radius (m)
refArray = phased.URA(N,[dy,dz]);
pos = getElementPosition(refArray);
elemToRemove = sum(pos.^2)>R^2; 
pos(:,elemToRemove) = []; % Exclude elements outside circle
circularPlanarArray = phased.ConformalArray('ElementPosition',pos,...
                           'ElementNormal',zeros(2,size(pos,2)));

viewArray(circularPlanarArray,'Title','Circular Planar Array');

How can we find the phase shift between the elements for desired steering angle?

As in case of recatangular array phase shifts between elements for desired steering angle can be found using

a = design(rectangularArray('Size',[4 3]),1.8e9,reflector);
ps = phaseShift(a,1.8e9,[30;45])             %ps = phaseShift(array,frequency,angle)

ps =

350.5337

54.1733

117.8129

240.3066

303.9462

7.5858

130.0796

193.7192

257.3588

Basic aim is to find phase shifts between the transmitting elements for beam steering in the required azimuth and elevtion.