Main Content

eggCrate

Create egg crate array of Vivaldi antenna elements

Since R2021a

Description

The eggCrate object creates an array of Vivaldi antenna elements arranged in a rectangular egg-crate structure. Egg crate arrays are used in phased array applications in radar systems.

Egg crate geometry, default radiation pattern, and impedance plot.

Creation

Description

example

array = eggCrate creates an array of Vivaldi antenna elements arranged in a rectangular egg-crate structure in the X-Y plane at an operating frequency of 825 MHz.

example

array = eggCrate(Name=Value) creates an array of Vivaldi antenna elements, with additional Properties specified by one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1=Value1, ..., NameN=ValueN. Properties you do not specify retain their default values.

Properties

expand all

Vivaldi antenna, specified as either a vivaldi or vivaldiOffsetCavity object.

Example: vivaldi

Number of rows and columns in the egg crate array, specified as a two-element vector.

Note

You can use NumElements to determines number of Vivaldi antenna elements in the egg-crate array.

Example: [4 4]

Data Types: double

Spacing between the Vivaldi antenna elements, specified as a two-element vector with each element in meters. The first element in the vector represents the spacing between the Vivaldi elements along x-axis. The second element represents the spacing between the Vivaldi elements along y-axis.

Example: [0.1 0.2]

Data Types: double

Magnitude of the voltage applied to the feed, specified as a as a positive scalar or a vector of positive elements in volts. If you specify a vector, it must be of the same size as 'NumElements'.

Example: 2

Data Types: double

Phase shift for each element in the array, specified as a real scalar or a vector of real elements in degrees. If you specify a vector, it must be of the same size as 'NumElements'.

Example: -12

Data Types: double

Tilt angle of the array in degrees, specified as a scalar or vector. For more information, see Rotate Antennas and Arrays.

Example: 90

Example: Tilt=[90 90],TiltAxis=[0 1 0;0 1 1] tilts the array at 90 degrees about the two axes, defined by the vectors.

Data Types: double

Tilt axis of the array, specified as one of these values:

  • 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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the array rotates around the line joining the two points.

  • "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Solver for antenna analysis, specified as either "MoM" (Method of Moments) or "MoM-PO" (Method of Moments-Physical Optics) hybrid or "FMM" (Fast Multipole Method).

Example: "MoM-PO"

Data Types: string

Object Functions

axialRatioCalculate and/or plot axial ratio of antenna or array
beamwidthBeamwidth of antenna
chargeCharge distribution on antenna or array surface
currentCurrent distribution on antenna or array surface
efficiencyRadiation efficiency of antenna
EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
impedanceInput impedance of antenna or scan impedance of array
infoDisplay information about antenna, array, or platform
memoryEstimateEstimate memory required to solve antenna or array mesh
meshMesh properties of metal, dielectric antenna, or array structure
meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
optimizeOptimize antenna or array using SADEA optimizer
patternPlot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuthAzimuth plane radiation pattern of antenna or array
patternElevationElevation plane radiation pattern of antenna or array
rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
returnLossReturn loss of antenna or scan return loss of array
showDisplay antenna, array structures, shapes, or platform
solverAccess FMM solver for electromagnetic analysis
sparametersCalculate S-parameters for antennas and antenna arrays
vswrVoltage standing wave ratio (VSWR) of antenna or array element

Examples

collapse all

Create a default egg-crate array.

eca = eggCrate
eca = 
  eggCrate with properties:

        Element: [1x1 vivaldi]
           Size: [2 2]
            Gap: [0 0]
    FeedVoltage: 1
      FeedPhase: 0
           Tilt: 0
       TiltAxis: [1 0 0]
     SolverType: 'MoM'

View the array using the show function.

show(eca)

Plot the radiation pattern of the egg-crate array at a frequency of 825 MHz.

pattern(eca,825e6)

Create a 2-by-2 egg-crate array with a spacing of 20 mm between the Vivaldi elements.

eca = eggCrate(Size=[2 2], Gap=[20e-3 20e-3])
eca = 
  eggCrate with properties:

        Element: [1x1 vivaldi]
           Size: [2 2]
            Gap: [0.0200 0.0200]
    FeedVoltage: 1
      FeedPhase: 0
           Tilt: 0
       TiltAxis: [1 0 0]
     SolverType: 'MoM'

View the array using the show function.

show(eca)

Plot the radiation pattern of the array at a frequency of 0.9 GHz.

pattern(eca,0.9e9)

Create a 1-by-4 egg-crate array with vivaldiOffsetCavity elements.

eca = eggCrate(Element=vivaldiOffsetCavity, Size=[1 4])
eca = 
  eggCrate with properties:

        Element: [1x1 vivaldiOffsetCavity]
           Size: [1 4]
            Gap: [0 0]
    FeedVoltage: 1
      FeedPhase: 0
           Tilt: 0
       TiltAxis: [1 0 0]
     SolverType: 'MoM'

View array using the show function.

show(eca)

Plot the S-parameters of the array over a frequency range of 14--17 GHz.

s = sparameters(eca,linspace(14e9,17e9,41));
rfplot(s)

More About

expand all

References

[1] Chu, Hao-Lung, Ghanshyam Mishra, and Satish K. Sharma. “Dual Polarized Wideband Vivaldi 4x4 Subarray Antenna Aperture for 5G Massive MIMO Panels with Simultaneous Multiple Beams.” In 2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 1–2. Waterloo, ON: IEEE, 2018. https://doi.org/10.1109/ANTEM.2018.8572871.

[2] R. Hahnel and D. Plettemeier, "Dual-polarized Vivaldi array for X- and Ku-Band," Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation,2012, pp. 1-2.

[3] Yan, J., S. Gogineni, Bruno Camps-Raga and J. Brozena. “A Dual-Polarized 2–18-GHz Vivaldi Array for Airborne Radar Measurements of Snow.” IEEE Transactions on Antennas and Propagation, 2016, vol. 64, pp. 781-785.

Version History

Introduced in R2021a