MATLAB: How to obtain the gain of antenna from antenna pattern file at a particular elevation and azimuth angle.

antenna patternelevation and azmiuth angles

Hello,

I am trying to obtain a 3D antenna radiation gain pattern using antenna pattern file. The format for antenna pattern file usually is a set of elevation angles ( at 1 azimuth angle) and assosciated gain. And a set of azimuth angles( at 0 elevation angle) and assosciated gain. How do I combine / interpolate the two, to find the gain at any point in space defined by (elevation, azimuth) angle pair using MATLAB?

Any help will be appreciated. Thank you

Best Answer

if you are trying to reconstruct the full 3D pattern from two slices of the pattern. you may find the following example to be useful. this feature is availble in 19a.

https://www.mathworks.com/help/antenna/examples/3d-reconstruction-of-radiation-pattern-from-2d-orthogonal-slices.html

Related Solutions

MATLAB: Understanding how resp in phased.CustomAntennaElement works

Hi Philip,

When you pass in ang = [0 180], it is considered as two angles, az = 0 and az = 180. if you pass in ang = [0;180], then it is one angle pointing at az = 0 and el = 180.

HTH

MATLAB: Subarray Simulation have different output by using similar method

Conceptually the two approach is equivalent. The discrepancy you see is related to how you generate the custom antenna in your second approach. When you use the result from pattern, you essentially get only the magnitude data. However, even though the elements are isotropic, the response of an array has phase information in there. Therefore, instead of using

[embpattern, az, el] = pattern(subarray,fc);
ant_sub = phased.CustomAntennaElement('FrequencyVector',[10e9,50e9],...
    'AzimuthAngles',az,...
    'ElevationAngles',el,...
    'MagnitudePattern',embpattern,...
    'PhasePattern',zeros(size(embpattern)));

I would use the following code to generate the custom antenna element

az = -180:180;
el = -90:90;
embpattern = complex(zeros(numel(el),numel(az)));
subarrayresp = phased.ArrayResponse('SensorArray',subarray);
for m = 1:numel(el)
    embpattern(m,:) = subarrayresp(fc,[az;el(m)*ones(size(az))]);
end
ant_sub = phased.CustomAntennaElement('FrequencyVector',[10e9,50e9],...
    'AzimuthAngles',az,...
    'ElevationAngles',el,...
    'MagnitudePattern',mag2db(abs(embpattern)),...
    'PhasePattern',angle(embpattern));

If you use this ant_sub in your program, you will see that the two approach give the same power level.

HTH

Best Answer

Related Solutions

MATLAB: Understanding how resp in phased.Cus​tomAntenna​Element works

MATLAB: Subarray Simulation have different output by using similar method

Related Question

MATLAB: Understanding how resp in phased.CustomAntennaElement works