Equations from Yagi Antenna Design

K defined as wavelength to radius of element.

- three term approximation

- exponent of wavelength to element radius ratio

Mutual Impedance

for s > 2 wavelengths

Mutual impedance calculated from Uda-Mushiake

Compute directivity

Drive voltage to elements

Positions of elements in wavelength.
X axis follows boom

Position of elements above or below boom (y dimension) in wavelength

Wavelength to element diameter at design frequency

Wavelength over diameter at test frequency

Element length at design frequency

Element spacing

Mutual and self impedances

Element currents from all mutual and self impedances and driving voltages.

Input impedance

E and H plane directivity

Read data files

Read data from file and converted it to a vector

Number of elements

Set frequency

Define each vector to a constant to make MathCad forget its previous size

Element spacing

Mutual and self impedances

Element currents from all mutual and self impedances and driving voltages.

Input impedance

Mathcad file developed by
Dr.Roman N Tunkel,
04/06/2002
tunkelr@rcn.com