monopoleCylindrical

Create cylindrical monopole antenna over rectangular ground plane

Description

The `monopoleCylindrical` object is a cylindrical monopole antenna mounted over a rectangular ground plane. This antenna is useful for designing thicker monopole antennas. These antennas are mostly used in wireless mobile communication due to their broadband characteristics and simple design.

Creation

Syntax

``ant = monopoleCylindrical``
``ant = monopoleCylindrical(Name,Value)``

Description

example

``` `ant = monopoleCylindrical` creates a cylindrical monopole antenna object with default dimensions for an operating frequency of 70 MHz.```

example

````ant = monopoleCylindrical(Name,Value)` sets Properties using one or more name-value pairs. For example, ```ant = monopoleCylindrical('Radius',0.04)```, creates a cylindrical monopole antenna with a radius of 0.04 meters.```

Properties

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Height of the monopole along the z-axis, specified as a positive scalar in meters.

Example: `'Height',3`

Data Types: `double`

Radius of the monopole, specified as a positive scalar in meters.

Example: `'Radius',0.05`

Data Types: `double`

Ground plane length along x-axis, specified as a positive scalar in meters.

Example: `'GroundPlaneLength',4`

Data Types: `double`

Ground plane width along y-axis, specified as a positive scalar in meters.

Example: `'GroundPlaneWidth',2.5`

Data Types: `double`

Signed distance from the center along the length and the width of the ground plane, specified as a two-element vector in meters.

Example: `'FeedOffset',[2 1]`

Data Types: `double`

Determine if the monopole top is closed with a cap or left open, specified as 0 or 1. Specify 1 for a closed-top monopole, and 0 for an open-top monopole.

Example: `'ClosedEnd',1`

Data Types: `double`

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 `metal`. For more information on metal conductor meshing, see Meshing.

Example: `m = metal('Copper'); 'Conductor',m`

Example: `m = metal('Copper'); ant.Conductor = m`

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.

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'`

Data Types: `double`

Lumped elements added to the antenna feed, specified as a `lumpedElement` object handle. You can add a load anywhere on the surface of the antenna. By default, the load is at the feed. For more information, see `lumpedElement`.

Example: `'Load',lumpedelement`, where `lumpedelement` is the load added to the antenna feed.

Example: `ant.Load = lumpedElement('Impedance',75)`

Object Functions

 `show` Display antenna, array structures or shapes `axialRatio` Axial ratio of antenna `beamwidth` Beamwidth of antenna `charge` Charge distribution on antenna or array surface `current` Current distribution on antenna or array surface `cylinder2strip` Cylinder equivalent width approximation `design` Design prototype antenna or arrays for resonance around specified frequency `efficiency` Radiation efficiency of antenna `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, 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 `rcs` Calculate and plot radar cross section (RCS) of platform, antenna, or array `returnLoss` Return loss of antenna; scan return loss of array `sparameters` Calculate S-parameter for antenna and antenna array objects `strip2cylinder` Calculates equivalent radius approximation for strip `vswr` Voltage standing wave ratio of antenna

Examples

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Create a cylindrical monopole antenna with default properties.

`ant = monopoleCylindrical`
```ant = monopoleCylindrical with properties: Height: 1 Radius: 0.0400 GroundPlaneLength: 2 GroundPlaneWidth: 2 FeedOffset: [0 0] ClosedEnd: 0 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement] ```

View the antenna using the `show` function.

`show(ant)`

Plot the radiation pattern of cylindrical monopole antenna at a frequency of 70 MHz.

`pattern(ant,70e6)`

Create a cylindrical monopole antenna with length and radius as 1 m and 50 mm respectively.

```ant = monopoleCylindrical; ant.Height = 1; ant.Radius = 50e-3```
```ant = monopoleCylindrical with properties: Height: 1 Radius: 0.0500 GroundPlaneLength: 2 GroundPlaneWidth: 2 FeedOffset: [0 0] ClosedEnd: 0 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement] ```

Visualize the antenna using `show `function.

`show(ant)`

Plot the S-parameters over a frequency range of 30 MHz to 120 MHz.

```s = sparameters(ant,linspace(30e6,120e6,51)); rfplot(s)```

Create cylindrical monopole antennas with an open-ended top and a closed-ended top respectively.

```ant = monopoleCylindrical("Radius",0.1); ant_ClosedEnded = monopoleCylindrical("Radius",0.1,"ClosedEnd",1);```

Calculate and plot the current distribution for a cylindrical monopole antennas at 70 MHz frequency.

`I_OpenEnded = current(ant,70e6)`
```I_OpenEnded = 3×334 complex -0.0105 + 0.0033i -0.0001 + 0.0000i 0.0063 - 0.0024i -0.0008 + 0.0004i 0.0222 - 0.0056i -0.0013 + 0.0005i -0.0575 + 0.0053i -0.0037 + 0.0017i 0.0013 - 0.0005i 0.0120 - 0.0039i 0.0005 - 0.0002i 0.0111 - 0.0034i 0.0083 - 0.0029i -0.0346 + 0.0034i -0.0021 + 0.0010i -0.0108 + 0.0034i -0.0129 + 0.0033i -0.0011 + 0.0002i -0.0007 + 0.0003i -0.0061 + 0.0023i 0.0038 - 0.0010i -0.0034 + 0.0011i -0.0064 + 0.0023i -0.0059 + 0.0022i -0.0040 + 0.0019i -0.0226 + 0.0061i -0.0216 + 0.0059i -0.0084 + 0.0029i 0.0022 - 0.0012i -0.0383 + 0.0074i -0.0084 + 0.0029i -0.0034 + 0.0017i 0.0224 - 0.0061i 0.0582 - 0.0050i 0.0155 - 0.0042i -0.0137 + 0.0044i 0.0008 + 0.0003i -0.0140 + 0.0043i 0.0580 - 0.0052i -0.0367 + 0.0032i 0.0008 - 0.0004i 0.0312 - 0.0062i 0.0007 - 0.0003i 0.0123 - 0.0020i 0.0032 - 0.0014i 0.0009 - 0.0005i -0.0112 + 0.0037i -0.0037 + 0.0017i 0.0019 - 0.0007i -0.0002 - 0.0002i 0.0096 - 0.0028i 0.0053 - 0.0020i 0.0030 - 0.0013i 0.0039 - 0.0019i 0.0073 - 0.0018i 0.0084 - 0.0030i 0.0207 - 0.0015i 0.0007 - 0.0003i 0.0081 - 0.0029i 0.0054 - 0.0018i 0.0247 - 0.0062i 0.0081 - 0.0025i 0.0027 - 0.0009i 0.0505 - 0.0044i 0.0034 - 0.0017i -0.0084 + 0.0025i -0.0189 + 0.0048i -0.0240 + 0.0061i -0.0037 + 0.0017i -0.0065 + 0.0023i 0.0246 - 0.0065i 0.0085 - 0.0030i 0.0061 - 0.0023i 0.0062 - 0.0022i 0.0008 - 0.0004i -0.0061 + 0.0017i 0.0059 - 0.0017i 0.0026 - 0.0009i -0.0009 + 0.0005i 0.0003 + 0.0001i -0.0027 + 0.0009i 0.0021 - 0.0010i 0.0058 - 0.0016i 0.0181 - 0.0018i -0.0174 + 0.0047i -0.0001 + 0.0000i 0.0620 - 0.0054i 0.0007 - 0.0002i -0.0187 + 0.0014i -0.0496 + 0.0046i -0.0039 + 0.0019i -0.0227 + 0.0040i 0.0037 - 0.0017i 0.0374 - 0.0072i 0.0039 - 0.0018i 0.0022 - 0.0011i 0.0044 - 0.0016i -0.0007 + 0.0003i 0.0084 - 0.0029i -0.0619 + 0.0056i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i ```
`current(ant,70e6)`

`I_ClosedEnded = current(ant_ClosedEnded,70e6)`
```I_ClosedEnded = 3×342 complex -0.0095 + 0.0039i -0.0001 + 0.0000i 0.0057 - 0.0027i -0.0007 + 0.0004i 0.0201 - 0.0069i -0.0012 + 0.0006i -0.0522 + 0.0084i -0.0034 + 0.0019i 0.0012 - 0.0006i 0.0109 - 0.0045i 0.0005 - 0.0003i 0.0101 - 0.0041i 0.0076 - 0.0034i -0.0314 + 0.0053i -0.0019 + 0.0011i -0.0098 + 0.0040i -0.0117 + 0.0041i -0.0010 + 0.0003i -0.0006 + 0.0003i -0.0056 + 0.0026i 0.0035 - 0.0012i -0.0031 + 0.0013i -0.0059 + 0.0026i -0.0054 + 0.0025i -0.0036 + 0.0021i -0.0206 + 0.0074i -0.0197 + 0.0071i -0.0076 + 0.0034i 0.0020 - 0.0013i -0.0348 + 0.0095i -0.0076 + 0.0034i -0.0031 + 0.0019i 0.0204 - 0.0073i 0.0528 - 0.0082i 0.0141 - 0.0050i -0.0125 + 0.0052i 0.0007 + 0.0003i -0.0127 + 0.0050i 0.0526 - 0.0084i -0.0333 + 0.0052i 0.0007 - 0.0004i 0.0283 - 0.0079i 0.0006 - 0.0003i 0.0112 - 0.0027i 0.0029 - 0.0016i 0.0008 - 0.0005i -0.0102 + 0.0043i -0.0034 + 0.0019i 0.0018 - 0.0008i -0.0002 - 0.0002i 0.0087 - 0.0034i 0.0048 - 0.0023i 0.0028 - 0.0014i 0.0036 - 0.0021i 0.0067 - 0.0022i 0.0076 - 0.0035i 0.0188 - 0.0026i 0.0006 - 0.0003i 0.0073 - 0.0034i 0.0049 - 0.0021i 0.0225 - 0.0075i 0.0074 - 0.0029i 0.0024 - 0.0011i 0.0458 - 0.0071i 0.0031 - 0.0019i -0.0077 + 0.0030i -0.0171 + 0.0058i -0.0218 + 0.0074i -0.0034 + 0.0019i -0.0059 + 0.0027i 0.0224 - 0.0079i 0.0078 - 0.0034i 0.0056 - 0.0026i 0.0056 - 0.0025i 0.0007 - 0.0004i -0.0055 + 0.0020i 0.0054 - 0.0020i 0.0023 - 0.0010i -0.0008 + 0.0005i 0.0003 + 0.0001i -0.0024 + 0.0011i 0.0019 - 0.0011i 0.0053 - 0.0019i 0.0164 - 0.0027i -0.0158 + 0.0057i -0.0001 + 0.0000i 0.0563 - 0.0089i 0.0006 - 0.0002i -0.0170 + 0.0024i -0.0450 + 0.0074i -0.0036 + 0.0021i -0.0206 + 0.0053i 0.0033 - 0.0019i 0.0340 - 0.0092i 0.0035 - 0.0021i 0.0020 - 0.0013i 0.0040 - 0.0018i -0.0006 + 0.0003i 0.0077 - 0.0034i -0.0562 + 0.0090i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i ```
```figure; current(ant_ClosedEnded,70e6)```