I ask if it is possible to keep azimuth beamwidth constant and change it in elevation plane.
I know that the change of one is related to the other.
for example, the increase beamwitdh in azimuth plane provide the decrease in the other plane.
But, may be there is a method to keep one constant and change the other ?
I think definitely yes. Think of a vertically stacked phased array antenna, where each element transmits the same narrow pattern in the horizontal plane. By varying the phase sent to each of the vertically stacked antenna elements, you vary only the elevation and shape of the lobe of the pattern, in the vertical plane.
Thank you for your answer.
in this case, radiation efficiency increases with a complication in terms network feeding which add losses.
yes it's possible,
you don't mentioned the type of your antenna.
but you can view this by using simple reflector antenna with radius r=1m
and using elliptic reflector with a=1m and b=2m.
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