Documentation |
RESP = step(H,FREQ,ANG)
RESP = step(H,FREQ,ANG) returns the antenna's voltage response RESP at operating frequencies specified in FREQ and directions specified in ANG.
Note: H specifies the System object™ on which to run this step method. The object performs an initialization the first time the step method is executed. This initialization locks nontunable properties 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 release method to unlock the object. |
RESP |
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 ANG while L represents the number of frequencies specified in FREQ. |
The cosine response, or cosine pattern, is given by:
$$P(az,el)={\mathrm{cos}}^{m}(az){\mathrm{cos}}^{n}(el)$$
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 antenna element. The cosine response is raised to a power of 1.5. The antenna frequency range is the IEEE^{®} X band from 8 to 12 GHz. The antenna operates at 10 GHz. Obtain the antenna's response for an incident angle of 30 degrees azimuth and 5 degrees elevation.
hant = phased.CosineAntennaElement(... 'FrequencyRange',[8e9 12e9],... 'CosinePower',1.5); % operating frequency fc = 10e9; % incident angle ang = [30;5]; % use the step method to obtain the antenna's response resp = step(hant,fc,ang);