Create biquad or double-biquad antenna
biquad antenna is center fed and symmetric about its
origin. The default length is chosen for an operating frequency of 2.8
The width of the strip is related to the diameter an equivalent cylinder:
d is the diameter of equivalent cylindrical dipole.
r is the radius of equivalent cylindrical dipole.
For a given cylinder radius, use the
cylinder2strip utility function to calculate the equivalent width. The
default strip dipole is center-fed. The feed point coincides with the origin. The origin
is located on the Y-Z plane.
creates a biquad
bq = biquad
biquad antenna with additional properties specified by one or more
name-value pair arguments.
bq = biquad(Name,Value)
Name is the property name and
Value is the corresponding value. You can specify
several name-value pair arguments in any order as
ValueN. Properties not
specified retain their default values.
NumLoops— Number of loops
Number of loops for the biquad, specified as a scalar integer. Setting this property to 4 supports a double biquad antenna.
ArmLength— Length of two arms
Length of two arms, specified as a scalar in meters. The default length is chosen for an operating frequency of 2.8 GHz.
Width— Biquad arm width
Biquad arm width, specified as a scalar in meters.
ArmElevation— Angle formed by biquad arms to X-Y plane
Angle formed by biquad arms to the X-Y plane, specified a scalar in meters.
Load— Lumped elements
Lumped elements added to the antenna feed, specified a lumped element
object handle. For more information, see
lumpedelement is the object handle for the load
Tilt— Tilt angle of antenna
0(default) | scalar | vector
Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.
'TiltAxis',[0 1 0;0 1 1]
tilts the antenna at 90 degree about two axes, defined by vectors.
TiltAxis— Tilt axis of antenna
[1 0 0](default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates |
Tilt axis of the antenna, specified as:
Three-element vectors of Cartesian coordinates in meters. In this case, each vector starts at the origin and lies along the specified points on the X-, Y-, and Z-axes.
Two points in space, each specified as three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points in space.
A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'.
For more information, see Rotate Antennas and Arrays.
'TiltAxis',[0 1 0]
'TiltAxis',[0 0 0;0 1 0]
ant.TiltAxis = 'Z'
|Display antenna or array structure; Display shape as filled patch|
|Display information about antenna or array|
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on metal or dielectric antenna or array surface|
|Current distribution on metal or dielectric antenna or array surface|
|Design prototype antenna or arrays for resonance at specified frequency|
|Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays|
|Input impedance of antenna; scan impedance of array|
|Mesh properties of metal or dielectric antenna or array structure|
|Change mesh mode of antenna structure|
|Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array|
|Azimuth pattern of antenna or array|
|Elevation pattern of antenna or array|
|Return loss of antenna; scan return loss of array|
|Voltage standing wave ratio of antenna|
Create a biquad antenna with arm angles at 50 degrees and view it.
bq = biquad('ArmElevation',50); show(bq)
Calculate the impedance of a biquad antenna over a frequency span 2.5GHz-3GHz.
bq = biquad('ArmElevation',50); impedance(bq,linspace(2.5e9,3e9,51));
Create and view a double biquad antenna using default property values.
ant = biquad('NumLoops',4)
ant = biquad with properties: NumLoops: 4 ArmLength: 0.0305 ArmElevation: 45 Width: 1.0000e-03 Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]