Add data to polar plot
p— Polar plot
Polar plot, specified as a scalar handle.
data— Antenna or array data
Antenna or array data, specified as one of the following:
A real length-M vector, where M contains the magnitude values with angles assumed to be degrees.
A real M-by-N matrix, where M contains the magnitude values and N contains the independent data sets. Each column in the matrix has angles taken from the vector degrees. The set of each angle can vary for each column.
A real N-D array, where N is
the number of dimensions. Arrays with dimensions
greater are independent data sets.
A complex vector or matrix, where
Cartesian coordinates ((x,y) of each point. x contains
the real part of
data and y contains
the imaginary part of
When data is in a logarithmic form such as dB, magnitude values
can be negative. In this case,
the lowest magnitude values at the origin of the polar plot and highest
magnitude values at the maximum radius.
angle— Set of angles
Set of angles, specified as a vector in degrees.
magnitude— Set of magnitude values
Set of magnitude values, specified as a vector or a matrix. For a matrix of magnitude values, each column is an independent set of magnitude values and corresponds to the same set of angles.
Create a helix antenna that has 28 mm radius, a 1.2 mm width, and 4 turns. Calculate the directivity of the antenna at 1.8 GHz.
hx = helix('Radius',28e-3,'Width',1.2e-3,'Turns',4); H = pattern(hx, 1.8e9,0,0:1:360);
Plot the polar pattern.
P = polarpattern(H);
Create a dipole antenna and calculate the directivity at 270 MHz.
d = dipole; D = pattern(d,270e6,0,0:1:360);
Add the directivity of the dipole to the existing polar plot of helix antenna.
Create a dipole and plot the polar pattern of its directivity at 75 MHz.
d = dipole; D = pattern(d,75e6,0,0:1:360); P = polarpattern(D);
Create a cavity antenna. Calculate the directivity of the antenna at 1 GHz. Write the directivity of the antenna to
cavity.pln using the
c = cavity; msiwrite(c,1e9,'cavity','Name','Cavity Antenna Specifications');
Read the data from
Optional structures using the
[Horizontal,Vertical,Optional] = msiread('cavity.pln')
Horizontal = struct with fields: PhysicalQuantity: 'Gain' Magnitude: [360x1 double] Units: 'dBi' Azimuth: [360x1 double] Elevation: 0 Frequency: 1.0000e+09 Slice: 'Elevation'
Vertical = struct with fields: PhysicalQuantity: 'Gain' Magnitude: [360x1 double] Units: 'dBi' Azimuth: 0 Elevation: [360x1 double] Frequency: 1.0000e+09 Slice: 'Azimuth'
Optional = struct with fields: name: 'Cavity Antenna Specifications' frequency: 1.0000e+09 gain: [1x1 struct]
Add horizontal directivity data of the cavity antenna to the existing polar pattern of the dipole