Create a rhombic antenna
rhombic object creates a rhombic antenna. It consists of a
rhombus with a feed at one acute angles and a termination resistor at the other acute angle.
It has a simple design and is highly directional. These antennas are used in shortwave radio
broadcasting and point-to-point communications.
creates a rhombic antenna.
The dimensions are chosen for resonant frequency of 510 MHz. The default rhombic antenna
is fed at one acute angle and the other acute angle is terminated with a load of 500
ant = rhombic
sets Properties using one or more
name-value pairs. For example,
ant = rhombic(Name,Value)
ant = rhombic('ArmLength', 3) creates
a rhombic antenna with an arm of length 3 meters.
ArmLength — Length of arm
2 (default) | positive scalar
Length of each of the rhombus, specified as a scalar in meters.
ArmElevation — Angle between adjacent arms at feed
20 (default) | positive scalar
The acute angle between the adjacent arms at the feed location, specified as a scalar in degrees.
Width — Width of arm
0.1 (default) | positive scalar
Width of the arm of the rhombus, specified as a scalar in meters.
Conductor — Type of metal material
'PEC' (default) |
Type of the metal used as a conductor, specified as a metal material object. You can
choose any metal from the
MetalCatalog or specify a metal of your choice. For more information, see
more information on metal conductor meshing, see Meshing.
m = metal('Copper'); 'Conductor',m
m = metal('Copper'); ant.Conductor = m
Load — Lumped elements
lumpedElement] (default) |
Lumped elements added to the antenna feed, specified as a
lumpedElement object. The load element is located opposite the feed
at one of the acute angles of the rhombus. For more information, see
lumpedElement is the where
lumpedElement is the
load added to the antenna feed.
ant.Load = lumpedElement('Impedance',75)
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 vector of Cartesian coordinates in meters. In this case, each coordinate in the 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'
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.
ant.Tilt = 90
'TiltAxis',[0 1 0;0 1
1] tilts the antenna at 90 degrees about the two axes defined by the
|Display antenna, array structures or shapes|
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on antenna or array surface|
|Current distribution on antenna or array surface|
|Design prototype antenna or arrays for resonance around specified frequency|
|Radiation efficiency of antenna|
|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, 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|
|Calculate and plot radar cross section (RCS) of platform, antenna, or array|
|Return loss of antenna; scan return loss of array|
|Calculate S-parameter for antenna and antenna array objects|
|Voltage standing wave ratio of antenna|
Create Default Rhombic Antenna and Plot Radiation Pattern
Create a default rhombic antenna.
ant = rhombic
ant = rhombic with properties: ArmLength: 2 ArmElevation: 20 Width: 0.1000 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
View the antenna using the
Plot the radiation pattern of the antenna at 510 MHz.
 Decker, R. “The Influence of Gain and Current Attenuation on the Design of the Rhombic Antenna.” IRE Transactions on Antennas and Propagation 7, no. 2 (April 1959): 188–196.
Introduced in R2020b