Beamwidth of antenna
the beamwidth of the input antenna at a specified frequency. The beamwidth
is the angular separation at which the magnitude of the directivity
pattern decreases by a certain value from the peak of the main beam.
The directivity decreases in the direction specified by azimuth and
elevation angles of the antenna.
Plot the beamwidth for a dipole antenna at azimuth=0 and elevation=1:1:360 (x-z plane)
d = dipole; beamwidth(d,70e6,0,1:1:360);
Calculate the beamwidth of a helix antenna and the angles of the beamwidth. The antenna has an azimuth angle of 1:1:360 degrees, an elevation angle of 0 degrees on the X-Y plane, and a dB down value of 5 dB.
hx = helix; [bw,angles] = beamwidth(hx,2e9,1:1:360,0,5)
bw = 145
angles = 1×2 143 288
antenna— Antenna object
Antenna object, specified as a scalar handle.
frequency— Frequency used to calculate beamwidth
Frequency to calculate beamwidth, specified as a scalar in Hz.
azimuth— Azimuth angle of antenna
Azimuth angle of the antenna, specified as a scalar or vector in degrees. If the elevation angle is specified as a vector, then the azimuth angle must be a scalar.
elevation— Elevation angle of antenna
Elevation angle of the antenna, specified as a scalar or vector in degrees. If the azimuth angle is specified as a vector, then the elevation angle must be a scalar.
dBdown— Power point from peak of main beam of antenna
3(default) | scalar in dB
Power point from peak of main beam of antenna, specified as a scalar in dB.
bw— Beamwidth of antenna
Beamwidth of antenna, returned as a scalar in degrees.
angles— Points on plane
Points on plane used to measure beamwidth, returned as a vector in degrees.