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Create helix antenna on ground plane

The `helix`

object is a helix antenna
on a circular ground plane. The helix antenna is a common choice in
satellite communication.

The width of the strip is related to the diameter of an equivalent cylinder by the equation

$$w=2d=4r$$

*w*is the width of the strip.*d*is the diameter of an equivalent cylinder.*r*is the radius of an equivalent cylinder.

For a given cylinder radius, use the `cylinder2strip`

utility
function to calculate the equivalent width. The default helix antenna
is end-fed. The circular ground plane is on the X-Y plane. Commonly,
helix antennas are used in axial mode. In this mode, the helix circumference
is comparable to the operating wavelength and the helix has maximum
directivity along its axis. In normal mode, helix radius is small
compared to the operating wavelength. In this mode, the helix radiates
broadside, that is, in the plane perpendicular to its axis. The basic
equation for the helix is

$$\begin{array}{l}x=r\mathrm{cos}(\theta )\\ y=r\mathrm{sin}(\theta )\\ z=S\theta \end{array}$$

where

*r*is the radius of the helix.*θ*is the winding angle.*S*is the spacing between turns.

For a given pitch angle in degrees, use the `helixpitch2spacing`

utility function
to calculate the spacing between the turns in meters.

`hx = helix`

`hx = helix(Name,Value)`

creates
a helix antenna operating in axial mode. The default antenna operates
around 2 GHz.`hx`

= helix

creates
a helix antenna, with additional properties specified by one or more
name–value pair arguments. `hx`

= helix(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.

`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 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 |

`pattern` | Radiation pattern 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 |

[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.

[3] Zhang, Yan, Q. Ding, J. Chen, S. Lu, Z. Zhu and L. L.
Cheng. “A Parametric Study of Helix Antenna for S-Band Satellite
Communications.” * 9th International Symposium on
Antenna Propagation and EM Thoery (ISAPE)*. 2010, pp. 193–196.

[4] Djordjevic, A.R., Zajic, A.G., Ilic, M. M., Stuber, G.L.
“Optimization of Helical antennas (Antenna Designer's Notebook)” * IEEE
Antennas and Propagation Magazine*. December, 2006, pp.
107, pp.115.

`cylinder2strip`

| `helixpitch2spacing`

| `monopole`

| `pifa`

| `spiralArchimedean`

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