RESP = step(H,FREQ,ANG,V) returns
the responses RESP of the subarrays in the array,
at operating frequencies specified in FREQ and
directions specified in ANG. The phase center
of each subarray is at its geometric center. V is
the propagation speed. The elements within each subarray are connected
to the subarray phase center using an equal-path feed.

RESP = step(H,FREQ,ANG,V,STEERANGLE) uses STEERANGLE as
the subarray's steering direction. This syntax is available
when you set the SubarraySteering property to
either 'Phase' or 'Time'.

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.

Input Arguments

H

Partitioned array object.

FREQ

Operating frequencies of array in hertz. FREQ
is a row vector of length L. Typical values are within the range specified
by a property of H.Array.Element. That property
is named FrequencyRange or FrequencyVector,
depending on the type of element in the array. The element has zero
response at frequencies outside that range.

ANG

Directions in degrees. ANG can be either
a 2-by-M matrix or a row vector of length M.

If ANG is a 2-by-M matrix, each column
of the matrix specifies the direction in the form [azimuth; elevation].
The azimuth angle must be between –180 and 180 degrees, inclusive.
The elevation angle must be between –90 and 90 degrees, inclusive.

If ANG is a row vector of length M, each
element specifies a direction's azimuth angle. In this case,
the corresponding elevation angle is assumed to be 0.

V

Propagation speed in meters per second. This value must be a
scalar.

STEERANGLE

Subarray steering direction. STEERANGLE can
be either a 2-element column vector or a scalar.

If STEERANGLE is a 2-element column vector,
it has the form [azimuth; elevation]. The azimuth
angle must be between –180 and 180 degrees, inclusive. The
elevation angle must be between –90 and 90 degrees, inclusive.

If STEERANGLE is a scalar, it specifies
the direction's azimuth angle. In this case, the elevation
angle is assumed to be 0.

Output Arguments

RESP

Voltage responses of the subarrays of a phased array. The output
depends on whether the array supports polarization or not.

If the array is not capable of supporting polarization,
the voltage response, RESP, has the dimensions N-by-M-by-L.
The size N represents the number of subarrays in
the phased array, M represents the number of angles
specified in ANG, and L represents
the number of frequencies specified in FREQ.
For a particular subarray, each column of RESP contains
the responses of the subarray for the corresponding direction specified
in ANG. Each of the L pages
of RESP contains the responses of the subarrays
for the corresponding frequency specified in FREQ.

If the array is capable of supporting polarization,
the voltage response, RESP, is a MATLAB^{®}struct containing
two fields, RESP.H and RESP.V.
The field RESP.H represents the array's
horizontal polarization response while RESP.V represents
the array's vertical polarization response. Each field has
the dimensions N-by-M-by-L.
The size N represents the number of subarrays in
the phased array, M represents the number of angles
specified in ANG, and L represents
the number of frequencies specified in FREQ.
For a particular subarray, each column of RESP contains
the responses of the subarray for the corresponding direction specified
in ANG. Each of the L pages
of RESP contains the responses of the subarrays
for the corresponding frequency specified in FREQ.