Compute and display beamwidth of sensor element pattern
plots the 2-D power pattern (in dB) of the
element for all azimuth
angles at an elevation angle of zero degrees. The plot displays the half-power beamwidth (in
degrees) at the frequency specified in
freq (in Hz) and the angles (in
degrees) in azimuth at which the magnitude of the power pattern decreases by 3 dB from the
peak of the main beam.
Plot the beamwidth for an isotropic antenna at 1 GHz.
Create an isotropic antenna using a
antenna = phased.IsotropicAntennaElement('FrequencyRange',[800e6 1.2e9])
antenna = phased.IsotropicAntennaElement with properties: FrequencyRange: [800000000 1.2000e+09] BackBaffled: false
beamwidth function, plot the half-power (3 dB) beamwidth for the antenna. Use a frequency value of 1 GHz.
ans = 360
Calculate the half-power beamwidth and angles of a cosine antenna element.
phased.CosineAntennaElement object with the
'CosinePower' exponents set to 10.
myAnt = phased.CosineAntennaElement('CosinePower',[10 10])
myAnt = phased.CosineAntennaElement with properties: FrequencyRange: [0 1.0000e+20] CosinePower: [10 10]
Compute the beamwidth and angles of the antenna element when it is operating at 1 GHz. Set
'dbDown' to 3 dB.
[BW,Ang] = beamwidth(myAnt,1e9,'dbDown',3)
BW = 29.9600
Ang = 1×2 -14.9800 14.9800
element— Antenna or microphone element
Antenna or microphone element, specified as one of the following System objects:
freq— Frequency used to calculate beamwidth
Frequency used to calculate the beamwidth, specified as a scalar in Hz.
comma-separated pairs of
the argument name and
Value is the corresponding value.
Name must appear inside quotes. You can specify several name and value
pair arguments in any order as
beamwidth(element,1e9,'Cut','Azimuth','CutAngle',45)plots the beamwidth of the antenna element that is operating at a frequency of 1 GHz, with the slice direction set to
'Azimuth', and the cut angle set to 45 degrees.
'Cut'— Slice direction in azimuth-elevation space
The slice direction in azimuth-elevation space along which the beamwidth is
computed, specified as the comma-separated pair consisting of
'Azimuth' for the azimuth plane,
'Elevation' for the elevation
'CutAngle'— Angle for plane to get required 2-D cut
0(default) | scalar
Corresponding angle (in degrees) for the plane to get the required 2-D cut,
specified as the comma-separated pair consisting of
and a scalar. If
'Cut' is specified as
should lie between [−90, 90] degrees. If
'Cut' is specified as
should lie between [−180, 180] degrees.
'dBDown'— Power value from peak of main lobe
Inf| positive scalar
Power value (in dB) from the peak of the main lobe, specified as the
comma-separated pair consisting of
'dBDown' and a positive
scalar. The default value is 3 dB, which translates to half-power beamwidth. To
calculate the first-null beamwidth, specify the
'dBDown' value as
bw— Angular beamwidth
Angular beamwidth of the sensor element, returned as a scalar in degrees.
angles— Angle values of beamwidth
Angle values of the beamwidth, returned as a 1-by-2 vector. The two elements in the
amax] define the beamwidth