Wifi Yagi Calculator

Posted : admin | On 16-09-2021

WC7I provides a calculator for a 3 element yagi design. This is where you input the center frequency in MEGAHERTZ. If you decide you really need a yagi with more elements, here are the lengths of them.

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3 element Yagi Antenna Calculator | Yagi Antenna Calculator

This page covers 3 element Yagi Antenna calculator. The formula and basics of Yagi Antenna Calculator are also explained with example.The calculators for other antenna types such as parabolic,horn,dipole and patch are also mentioned.

What is Yagi Antenna ?

The simple Yagi Antenna is shown in the figure-1. It consists of three elements viz. director, dipole andreflector. It may have one or multiple directors.
Dipole (i.e. Driven Element): It is the feed point where feedline is usually attached from transmitter.This helps in transfer of energy from transmitter module to antenna.The feed point is located at the center of the driven element. It becomes resonant when its electrical lengthis about half of wavelength of frequency.
Director: It is designed mainly for receiving EM waves. It is shortest of parasitic elements.It has length which is 5% short compare to driven element. It has resonant higher compare to driven element.It helps to achieve desired gain and directional pattern.The spacing between directors usually range from 0.1λ to 0.5λ or more.The Gain of Yagi Antenna depends on length of antenna array and do not depend on number of directors usedin the design.
Reflector: It is placed at rear of dipole or driven element.The length is usually 5% more compare to driven element. The spacing of reflector from driven elementis about 0.1 λ to 0.25 λ. The spacing also depend on bandwidth, gain, F/B ratio and sidelobe patternspecifications.

The following are the basic specifications considered in selecting Yagi Antenna and performing calculationsin this yagi antenna calculator.
• Bandwidth
• Impedance
• Gain
• Front to Back Ratio

Yagi Antenna Calculator

EXAMPLE of 3 element Yagi Antenna calculator:
INPUTS :
Operating Frequency (MHz) = 200
OUTPUTS:
Reflector Length = 0.7425 meters, Dipole Length = 0.7095 meters,Director Length = 0.66 meters,Reflector to Dipole Spacing = 0.1875 meters,Dipole to Director Spacing = 0.1875 meters