Cosine antenna element
CosineAntennaElement object models an antenna
with a cosine response in
both azimuth and elevation.
To compute the response of the antenna element for specified directions:
Define and set up your cosine antenna element. See Construction.
step to compute the antenna
response according to the properties of
The behavior of
step is specific to each object in
This antenna element is not capable of supporting polarization.
H = phased.CosineAntennaElement creates
a cosine antenna system object,
H, that models
an antenna element whose response is cosine raised to a specified
power greater than or equal to one in both the azimuth and elevation
H = phased.CosineAntennaElement( creates
a cosine antenna object,
H, with each specified
property set to the specified value. You can specify additional name-value
pair arguments in any order as (
Operating frequency range
Specify the operating frequency range (in Hz) of the antenna
element as a 1-by-2 row vector in the form
Exponent of cosine pattern
Specify the exponent of cosine pattern as a scalar or a 1-by-2
vector. All specified values must be real numbers greater than or
equal to 1. When you set
|clone||Create cosine antenna object with same property values|
|directivity||Directivity of cosine antenna element|
|getNumInputs||Number of expected inputs to step method|
|getNumOutputs||Number of outputs from step method|
|isLocked||Locked status for input attributes and nontunable properties|
|pattern||Plot cosine antenna element directivity and patterns|
|patternAzimuth||Plot cosine antenna element directivity or pattern versus azimuth|
|patternElevation||Plot cosine antenna element directivity or pattern versus elevation|
|plotResponse||Plot response pattern of antenna|
|release||Allow property value and input characteristics changes|
|step||Output response of antenna element|
The cosine response, or cosine pattern, is given by:
In this expression:
az is the azimuth angle.
el is the elevation angle.
The exponents m and n are real numbers greater than or equal to 1.
The response is defined for azimuth and elevation angles between –90 and 90 degrees, inclusive. There is no response at the back of a cosine antenna. The cosine response pattern achieves a maximum value of 1 at 0 degrees azimuth and elevation. Raising the response pattern to powers greater than one concentrates the response in azimuth or elevation.
Construct a cosine pattern antenna and calculate its response at boresight (0 degrees azimuth and 0 degrees elevation). Then, plot the antenna pattern. Assume the antenna works between 800 MHz and 1.2 GHz and its operating frequency is 1 GHz.
sCos = phased.CosineAntennaElement(... 'FrequencyRange',[800e6 1.2e9]); fc = 1e9; resp = step(sCos,fc,[0; 0]); pattern(sCos,fc,0,[-90:90],... 'Type','powerdb',... 'CoordinateSystem','polar')