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By Sean Goudeloc

Yagi-Uda array, or famously known as Yagi antenna, is labeled after its inventors Hidetsugu Yagi and Shintaro Uda who are affiliated with Tohoku, Imperial University in Japan. It is also known as beam antennas due to its high directionality and gain. It is composed of several vertical lines perpendicular with a single horizontal line. The vertical line are properly spaced to attain maximum results. Common measures for the spaces are about 1/10 to of a wavelength. A standard Yagi Wifi Antenna is consists of three components namely the driven element, the reflector and a number of directors, depending on the design used.

Driven element is the second element in a Yagi Wifi Antenna. It is called as such for the reason that it is the main element connected into the electronics, or in this case, the Wifi modem. It has two forms, either a simple dipole or a folded dipole. For a Yagi Wifi Antenna, folded dipole is commonly used. It also has two allied conductors. One is hooked up to the shield of coaxial cable and the other one is bonded to the signal. For excellent resonance, the length of the dipole element must be one half of the wavelength. In a model created by W9CF, the length of the driven element is about 58.55mm and its distance from the starting point or from the first element is about 18.34mm. It is crucial to match the coax cable with the antenna appropriate and accurately. A poor matching or a mismatch will lead to poor antenna signal. A large fraction of the power is mirrored back into the Wifi modem when it should be transmitted into the air.

Next component of a Yagi Wifi Antenna is the reflector. It is positioned at the opposite side of the dipole. Its main purpose is to generate a wave which shall contradict the waves from going backwards from the dipole using destructive interference. Destructive interference happens when two amplitudes with opposing signs clash with each other. A subtraction of amplitude shall happen, thereby resulting in lower amplitude.

Last component of the Yagi Wifi Antenna is the directors. They are oftentimes the majority of the elements. It is the term for all other elements that are not driven element or reflector. It allows directionality of the Yagi Wifi Antenna. The spacing of these director elements affects the bandwidth of the antenna. The more they are equally spaced, the better its gain. Another thing that is important in achieving better results of your Yagi Wifi Antenna is to provide larger space in between the directors using a constant factor while decreasing the length of each element. These directors are triggered by the driven element field, thereby producing their field of their own. If the reflector allows destructive interference, the directors, on the otherhand, allows both constructive and destructive interference. Constructive interference happens in the path of the boom. This happens when two amplitudes with synonymous signs clash with each other and therefore adding up the amplitudes together, thereby producing a combined, larger amplitude.

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