System object: phased.CosineAntennaElement
Output response of antenna element
RESP = step(H,FREQ,ANG)
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 object performs an initialization the first time the
is executed. This initialization locks nontunable
properties (MATLAB) and input specifications, such as dimensions, complexity,
and data type of the input data. If you change a nontunable property
or an input specification, the System
object issues an error.
To change nontunable properties or inputs, you must first call the
to unlock the object.
Antenna element object.
Operating frequencies of antenna in hertz.
Directions in degrees.
Voltage response of antenna element specified as an M-by-L,
complex-valued matrix. In this matrix, M represents
the number of angles specified in
Construct a cosine antenna element. The cosine response is raised to a power of 1.5 in both azimuth and elevation. The antenna frequency range lies in the X band (from 8 to 12 GHz) at 10 GHz. Obtain the antenna's response for an incident angle of 30° azimuth and 5° elevation.
antenna = phased.CosineAntennaElement('FrequencyRange',[8e9 12e9], ... 'CosinePower',1.5); fc = 10.0e9; ang = [30;5]; resp = antenna(fc,ang)
resp = 0.8013
step method returns the field
response (or field pattern)
of the cosine antenna element.
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 zero.
The response is defined for azimuth and elevation angles between –90° and 90°, inclusive, and is always positive. There is no response at the backside of a cosine antenna. The cosine response pattern achieves a maximum value of 1 at 0° azimuth and 0° elevation. Larger exponent values narrow the response pattern of the element and increase the directivity.
The power response (or power pattern) is the squared value of the field response.