# dipoleMeander

Create meander dipole antenna

## Description

The dipoleMeander class creates a meander dipole antenna with four dipoles. The antenna is center fed and it is symmetric about its origin. The first resonance of meander dipole antenna is at 200 MHz.

The width of the dipole is related to the diameter of an equivalent cylindrical dipole by the equation

$w=2d=4r$

, where:

• 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 X-Y plane.

## Creation

### Description

example

dm = dipoleMeander creates a meander dipole antenna with four dipoles.

dm = dipoleMeander(Name,Value) creates a meander dipole antenna with four dipoles, with additional properties specified by one or more name-value pair 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 not specified retain their default values.

## Properties

expand all

Dipole width, specified as a scalar in meters.

Example: 'Width',0.05

Data Types: double

Length of individual dipole arms, specified as a vector in meters. The total number of dipole arms generated is :

$2\ast N-1$

where N is the number of specified arm lengths.

Example: 'ArmLength',[0.6000 0.5000 1 0.4000]

Data Types: double

Notch length along the length of the antenna, specified as a scalar in meters.

For example, in a dipole meander antenna with seven stacked arms there are six notches.

Example: 'NotchLength',1

Data Types: double

Notch width perpendicular to the length of the antenna, specified as a scalar in meters.

Example: 'NotchWidth',1

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object handle for the load created using lumpedElement.

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.

Example: 'Tilt',90

Example: ant.Tilt = 90

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

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

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'.

Example: 'TiltAxis',[0 1 0]

Example: 'TiltAxis',[0 0 0;0 1 0]

Example: ant.TiltAxis = 'Z'

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

## Object Functions

 show Display antenna or array structure; display shape as filled patch info Display information about antenna or array axialRatio Axial ratio of antenna beamwidth Beamwidth of antenna charge Charge distribution on metal or dielectric antenna or array surface current Current distribution on metal or dielectric antenna or array surface design Design prototype antenna or arrays for resonance at specified frequency EHfields Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays impedance Input impedance of antenna; scan impedance of array mesh Mesh properties of metal or dielectric antenna or array structure meshconfig Change mesh mode of antenna structure optimize Optimize antenna or array using SADEA optimizer pattern Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array patternAzimuth Azimuth pattern of antenna or array patternElevation Elevation pattern of antenna or array returnLoss Return loss of antenna; scan return loss of array sparameters S-parameter object vswr Voltage standing wave ratio of antenna

## Examples

collapse all

Create and view the default meander dipole antenna.

dm = dipoleMeander
dm =
dipoleMeander with properties:

Width: 0.0040
ArmLength: [0.0880 0.0710 0.0730 0.0650]
NotchLength: 0.0238
NotchWidth: 0.0170
Tilt: 0
TiltAxis: [1 0 0]

show(dm)

Plot the radiation pattern of meander dipole antenna at a 200 MHz frequency.

dm = dipoleMeander;
pattern(dm,200e6)

## References

[1] Balanis, C.A. Antenna Theory: Analysis and Design. 3rd Ed. New York: Wiley, 2005.