Beamwidth of antenna
plots 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.
beamwidth plots only one beamwidth for symmetrical
beamwidth might not interpret the data well for partial
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 = 144
angles = 1×2 143 287
fractalGasket antenna object
fg = fractalGasket("NumIterations",4,"TiltAxis",[0 1 0],'Tilt',90);
Calculate beamwidth and angle of a
[bw,ang] = beamwidth(fg,1.3e9,0,0:1:360) % bw is a 2-by-1 vector.
bw = 2×1 24.0000 24.0000
ang = 2×2 348 12 168 192
Plot Second Beamwidth Solution
P = polarpattern('gco');
Hide the beamwidth span and remove the cursor C1 and C2. All the cursors can also be removed using the function
showSpan(P,0); removeCursors(P,1); removeCursors(P,2);
Add the cursors at other side of the plot and second beamwidth solution is displayed.
antenna— Antenna object
Antenna object, specified as a scalar.
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 or a 2-by-1 vector with each element unit in degrees.
angles— Points on plane
Points on plane used to measure beamwidth, returned as a vector with each element unit in degrees.