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By Sean Goudeloc
The four elements Yagi Wifi Antenna is composed of a reflector, a driven element and two directors. It is said, after a series of trials and errors, that the real deal in making this design of antenna is the length of the boom rather than the number of elements a yagi antenna has to be able to gauge its performance. In making this, you will need to consider a lot of specifications.
Four elements Yagi Wifi Antenna is devised for a high or a very high frequency spectrum. The boom length must take into great consideration simply because it holds the key to an excellent performance of the Yagi Wifi Antenna. According to the original creators of the yagi-uda antenna, the boom should measure approximately 0.3857 wavelengths. However, a longer boom is now being done as part of the antenna’s innovations. A measure of 5900 meters or 0.54 wavelengths is used by some antenna lovers to render better results of the antenna.
The average gain of a typical 4 element Yagi Wifi Antenna is about 8.3 dBi or 6.2 decibels but it may vary according to the type of 4 element design. For a 4 element short boom, maximum gain is just about 7 decibels while for a 4 element long boom, maximum gain may reach up to 8 decibels. Moreover, a design made in Italy called the Yagi Optimizer by the Marconi Club yielded a greater amount of gain. They garnered an excellent measurement of 15.66 dBi. The dimensions for the Italy project will be discussed in the latter part of the article.
[youtube]http://www.youtube.com/watch?v=Ih7J6V7KW0w[/youtube]
As discussed earlier, there are two types of a 4 element Yagi Wifi Antenna, the 4 element short boom and 4 element long boom. For the short boom, the dimensions are the following. The reflector measures about 4570 millimeter, the driven element is about 5020 millimeter, the first director has a length of 5190 millimeter and the second director is about 5460 millimeter. All elements are 22 millimeter thick and have a beamwidth of 85.2 degrees. It also has a front to back ratio of 22 decibels.
For a 4 element long boom, the reflector measures 4935 millimeter; the driven element has a length of 5080 millimeter; the first director is about 5180 millimeter; and lastly the second director measures 5480 millimeter. All of these elements have the same thickness with a 4 element short boom of 22 millimeters. Given with this lengths and thickness, the beamwidth was calculated to be 68 degrees and has a front to back ratio was found to be 30.2 decibels.
Now, for the dimensions of the greatest amount of gain identified in a project in Italy, we have the following configurations. The boom measures 5900 millimeters long; the reflector is about 2708.8 millimeters; the driven element is 2600 millimeters; the first director has a length of 2504.7 millimeters; and lastly, the second director is about 2424.2 millimeters long.
The spacing of each element, reflector being its reference point, are as follows. The reflector being the starting point has definitely no space measurement. The second element or the driven element is about 1044.5 millimeter away from the reflector. The first director has a spacing of 3126 millimeters from the reference point and the second director is 5900 millimeters away from the first element.
There are a lot of variations with the design and its configurations. This thing is a trial and error process in order to attain satisfactory results.
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