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directivity

System object: phased.IsotropicAntennaElement
Namespace: phased

Directivity of isotropic antenna element

Syntax

D = directivity(H,FREQ,ANGLE)

Description

D = directivity(H,FREQ,ANGLE) returns the Directivity (dBi) of an isotropic antenna element, H, at frequencies specified by FREQ and in direction angles specified by ANGLE.

Input Arguments

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Isotropic antenna element specified as a phased.IsotropicAntennaElement System object.

Example: H = phased.IsotropicAntennaElement;

Frequencies for computing directivity and patterns, specified as a positive scalar or 1-by-L real-valued row vector. Frequency units are in hertz.

  • For an antenna, microphone, or sonar hydrophone or projector element, FREQ must lie within the range of values specified by the FrequencyRange or FrequencyVector property of the element. Otherwise, the element produces no response and the directivity is returned as –Inf. Most elements use the FrequencyRange property except for phased.CustomAntennaElement and phased.CustomMicrophoneElement, which use the FrequencyVector property.

  • For an array of elements, FREQ must lie within the frequency range of the elements that make up the array. Otherwise, the array produces no response and the directivity is returned as –Inf.

Example: [1e8 2e6]

Data Types: double

Angles for computing directivity, specified as a 1-by-M real-valued row vector or a 2-by-M real-valued matrix, where M is the number of angular directions. Angle units are in degrees. If ANGLE is a 2-by-M matrix, then each column specifies a direction in azimuth and elevation, [az;el]. The azimuth angle must lie between –180° and 180°. The elevation angle must lie between –90° and 90°.

If ANGLE is a 1-by-M vector, then each entry represents an azimuth angle, with the elevation angle assumed to be zero.

The azimuth angle is the angle between the x-axis and the projection of the direction vector onto the xy plane. This angle is positive when measured from the x-axis toward the y-axis. The elevation angle is the angle between the direction vector and xy plane. This angle is positive when measured towards the z-axis. See Azimuth and Elevation Angles.

Example: [45 60; 0 10]

Data Types: double

Output Arguments

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Directivity, returned as an M-by-L matrix. Each row corresponds to one of the M angles specified by ANGLE. Each column corresponds to one of the L frequency values specified in FREQ. Directivity units are in dBi where dBi is defined as the gain of an element relative to an isotropic radiator.

Examples

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Compute the directivity of an isotropic antenna element in different directions.

Create an isotropic antenna element System object™.

antenna = phased.IsotropicAntennaElement();

First, specify that the directions of interest all at an elevation angle of zero degrees. The seven azimuth angles are centered around boresight (zero degrees azimuth and zero degrees elevation). Set the frequency to 1 GHz.

ang = [-30,-20,-10,0,10,20,30; 0,0,0,0,0,0,0];
freq = 1e9;

Compute the directivity along the constant elevation cut.

d = directivity(antenna,freq,ang)
d = 7×1

     0
     0
     0
     0
     0
     0
     0

Next, specify that the directions of interest all at an azimuth angle of zero degrees. All elevation angles are centered around boresight. The five elevation angles range from -20 to +20 degrees, inclusive. Set the frequency to 1 GHz.

ang = [0,0,0,0,0; -20,-10,0,10,20];
freq = 1e9;

Compute the directivity along the constant azimuth cut.

d = directivity(antenna,freq,ang)
d = 5×1

     0
     0
     0
     0
     0

For an isotropic antenna, the directivity is independent of direction.

More About

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