Crossed-dipole antenna element
a crossed-dipole antenna element. A crossed-dipole
antenna is often used for generating circularly polarized fields.
A crossed-dipole antenna is formed from two orthogonal short-dipole
antennas, one along y-axis and the other along the z-axis in the antenna's
local coordinate system. This antenna object generates right-handed
circularly polarized fields along the x-axis (defined
by 0° azimuth and 0° elevation angles).
To compute the response of the antenna element for specified directions:
Starting in R2016b, instead of using the
to perform the operation defined by the System
object, you can
call the object with arguments, as if it were a function. For example,
= step(obj,x) and
y = obj(x) perform
the system object,
h = phased.CrossedDipoleAntennaElement
h, to model a crossed-dipole
the system object,
h = phased.CrossedDipoleAntennaElement(
h, with each specified property
Name set to the specified Value. You can specify additional name-value
pair arguments in any order as (
Antenna operating frequency range
Antenna operating frequency range specified as a 1-by-2 row
vector in the form of
|directivity||Directivity of crossed-dipole antenna element|
|pattern||Plot crossed-dipole antenna element directivity and patterns|
|patternAzimuth||Plot crossed-dipole antenna element directivity or pattern versus azimuth|
|patternElevation||Plot crossed-dipole antenna element directivity or pattern versus elevation|
|plotResponse||Plot response pattern of antenna|
|step||Output response of antenna element|
Examine the response patterns of a crossed-dipole antenna used in an L-band radar with a frequency range between 1-2 GHz.
First, set up the radar parameters, and obtain the vertical and horizontal polarization responses at five different directions: elevation angles -30, -15, 0, 15 and 30 degrees, all at 0 degrees azimuth angle. The responses are computed at an operating frequency of 1.5 GHz.
sCD = phased.CrossedDipoleAntennaElement(... 'FrequencyRange',[1,2]*1e9); fc = 1.5e9; resp = step(sCD,fc,[0,0,0,0,0;-30,-15,0,15,30]); [resp.V, resp.H]
ans = -1.0607 + 0.0000i 0.0000 - 1.2247i -1.1830 + 0.0000i 0.0000 - 1.2247i -1.2247 + 0.0000i 0.0000 - 1.2247i -1.1830 + 0.0000i 0.0000 - 1.2247i -1.0607 + 0.0000i 0.0000 - 1.2247i
Next, draw a 3-D plot of the combined polarization response.
pattern(sCD,fc,[-180:180],[-90:90],... 'CoordinateSystem','polar',... 'Type','powerdb',... 'Polarization','combined')
The total response of a crossed-dipole antenna element is a
combination of its frequency response and spatial response.
both responses using nearest neighbor interpolation, and then multiplies
the responses to form the total response.
 Mott, H., Antennas for Radar and Communications, John Wiley & Sons, 1992.
Usage notes and limitations:
plotResponse methods are not supported.
See System Objects in MATLAB Code Generation (MATLAB Coder).