# monopole

Create monopole antenna over rectangular ground plane

## Description

The default `monopole`

object is a monopole antenna mounted
over a rectangular ground plane resonating around 72 MHz.

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

$$w=2d=4r$$

, where:

*d*is the diameter of equivalent cylindrical monopole*r*is the radius of equivalent cylindrical monopole.

For a given cylinder radius, use the `cylinder2strip`

utility function to calculate the equivalent width. The
default monopole is center-fed. The feed point coincides with the origin. The origin is
located on the *xy*- plane.

## Creation

### Description

creates a
quarter-wavelength monopole antenna with default dimensions. The default
dimensions are chosen for an operating frequency of around 72 MHz.`mpl`

= monopole

creates
a quarter-wavelength monopole antenna with additional properties specified
by one or more name-value pair arguments. `mpl`

= monopole(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
`Name1`

, `Value1`

,```
...
```

, `NameN`

, `ValueN`

.
Properties not specified retain their default values.

## Properties

## Object Functions

`axialRatio` | Calculate and plot axial ratio of antenna or array |

`bandwidth` | Calculate and plot absolute bandwidth of antenna or array |

`beamwidth` | Beamwidth of antenna |

`charge` | Charge distribution on antenna or array surface |

`current` | Current distribution on antenna or array surface |

`design` | Design prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects |

`efficiency` | Calculate and plot radiation efficiency of antenna or array |

`EHfields` | Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays |

`feedCurrent` | Calculate current at feed for antenna or array |

`impedance` | Calculate and plot input impedance of antenna or scan impedance of array |

`info` | Display information about antenna, array, or platform |

`memoryEstimate` | Estimate memory required to solve antenna or array mesh |

`mesh` | Mesh properties of metal, dielectric antenna, or array structure |

`meshconfig` | Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry |

`msiwrite` | Write antenna or array analysis data to MSI planet file |

`optimize` | Optimize antenna or array using SADEA optimizer |

`pattern` | Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array |

`patternAzimuth` | Azimuth plane radiation pattern of antenna or array |

`patternElevation` | Elevation plane radiation pattern of antenna or array |

`peakRadiation` | Calculate and mark maximum radiation points of antenna or array on radiation pattern |

`rcs` | Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array |

`resonantFrequency` | Calculate and plot resonant frequency of antenna |

`returnLoss` | Calculate and plot return loss of antenna or scan return loss of array |

`show` | Display antenna, array structures, shapes, or platform |

`sparameters` | Calculate S-parameters for antenna or array |

`stlwrite` | Write mesh information to STL file |

`vswr` | Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element |

## Examples

## References

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

[2] Volakis, John. *Antenna Engineering Handbook*, 4th Ed. New
York: Mcgraw-Hill, 2007.

## Version History

**Introduced in R2015a**