Create cavity-backed antenna
cavity object is a cavity-backed antenna located on the
X-Y-Z plane. The default cavity antenna has a dipole as an exciter. The feed point is on
c = cavity
c = cavity(Name,Value)
creates a cavity backed
antenna located on the X-Y-Z plane. By default, the dimensions are chosen
for an operating frequency of 1 GHz.
c = cavity
cavity-backed antenna, with additional properties specified by one or more
name–value pair arguments.
c = cavity(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.
Exciter— Antenna type used as exciter
dipole(default) | object
Antenna type used as an exciter, specified as an object. Except reflector and cavity antenna elements, you can use all the single elements in the Antenna Toolbox™ as an exciter.
Substrate— Type of dielectric material
The substrate dimensions must be equal to the groundplane dimensions.
d = dielectric('FR4');
d = dielectric('FR4'); cavity.Substrate =
Length— Length of rectangular cavity along x-axis
Length of the rectangular cavity along the x-axis, specified as a scalar in meters.
Width— Width of rectangular cavity along y-axis
Width of the rectangular cavity along the y-axis, specified as a scalar in meters.
Height— Height of rectangular cavity along z-axis
Height of the rectangular cavity along the z-axis, specified as a scalar in meters.
Spacing— Distance between exciter and base of cavity
Distance between the exciter and the base of the cavity, specified as a scalar in meters.
Load— Lumped elements
Lumped elements added to the antenna feed, specified as a lumped element
object handle. For more information, see
lumpedelement is the object handle for the load
EnableProbeFeed— Create probe feed from backing structure to exciter
Create probe feed from backing structure to exciter, specified as a
1. By default, probe feed is
Tilt— Tilt angle of antenna
Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antenna and Arrays.
'TiltAxis',[0 1 0;0 1 1]
tilts the antenna at 90 degree about two three-element vector points in
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 Antenna 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 and view a cavity-backed dipole antenna with 30cm length, 25cm width, 7.5cm height and spaced 7.5cm from the bowtie for operation at 1GHz.
c = cavity('Length',30e-2, 'Width',25e-2,'Height',7.5e-2,'Spacing',7.5e-2); show(c)
Create a cavity-backed antenna using a dielectric substrate 'FR4'.
d = dielectric('FR4'); c = cavity('Length',30e-2,'Width',25e-2,'Height',20.5e-3,'Spacing',7.5e-3,... 'Substrate',d)
c = cavity with properties: Exciter: [1x1 dipole] Substrate: [1x1 dielectric] Length: 0.3000 Width: 0.2500 Height: 0.0205 Spacing: 0.0075 EnableProbeFeed: 0 Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
Plot the radiation pattern of the antenna at a frequency of 1 GHz.
 Balanis, C.A.Antenna Theory: Analysis and Design.3rd Ed. New York: Wiley, 2005.