Parabolic & dish
Building an antenna
A Yagi-Uda array antenna, also known as a Yagi is a semi-directional antenna commonly used in wireless communications.
This antenna type is used for point-to-point network topology and sometimes for point-to-multi-point if long distance must be achieved.
Yagi antenna is made from the array of dipoles (elements) parallel to each other. The first (longest) element in this array is the reflector, second is the driven element and other elements are called directors. Yagi with more directors has the greater gain and antenna becomes longer.
This elements has a precise distance apart, and precise lengths (approximately 1/2 wavelength) to cause the antenna to operate most efficiently for a given radio frequency.
The antenna propagates signal in the direction from the reflector to the directors.
Yagi may be protect from weather conditions with a cylinder tube or pipe.
The Yagi-Uda antenna was invented in 1926 by Hidetsugu Yagi and Shintaro Uda in Tohoku University, Japan.
|5 - 20 dBi
||low to moderate