### Antenna Design

These are well known formulae for designing dipoles and Yagi antenna’s

DipoleLength_m(Freq_MHz) | Returns the length of a dipole antenna needed in metres for a specific frequency in Mhz |

YAGIelements(Frequency (Mhz),Number of elements, Element) | Returns the dimension in metres of the element in the argumentElement is a string use ‘Dipole’, ‘Refelector’, ‘Director’ or ‘Spacing’ only the first 3 letters are needed. Only calculates this for 2,3 and 6 element Yagi’s |

Below is a simple spreadsheet calculated using AstroExcel to calculate antenna designs for specific frequencies. The only functions used are DipoleLength() and YAGIelements() the rest is vanilla Excel

### Frequency/wavelength conversions

I’ve included these in the radio section but they are equally valid for all electromagnetic waves.

WavelengthToFrequency(Wavelength_in_Metres) | Converts a wavelength in meters into a frequency in Hertz |

FrequencyToWavelength(Frequency_in_Hertz) | Converts a frequency into a wavelength in metres |