Yagi Wifi Antenna: Yielding Maximum Gain

By Sean Goudeloc

Yagi Wifi Antenna is designed to accommodate long range connections. This antenna provides vast directionality and greater gain. Yielding maximum gain shall give you a remarkable wifi experience. To attain this much, you need to take into considerations the different configurations and measurement of the materials to be used in constructing your own Yagi Wifi Antenna.

Reflector Spacing

Using a single reflector model, a spacing of 0.2 ? at the rear side of the dipole yielded the greatest gain, which measured about 2.6 decibels. But when compared with a multiple reflector model, which uses three reflecting elements, results tends to be higher. At different distances and lengths of the reflector yielded an additional gain of 0.75 ?.

Different Equal Length of the Directors

The main variable measured in here is the length of the directors which may also correspond to the length of the overall Yagi Wifi Antenna. Results of investigation discovered that a length of 0.382 ?, 0.411 ? and 0.424 ? shall yield maximum gain. Moreover, it was found out that fairly short directors at a spacing of 0.3 ? can increase the gain up to its ceiling of 14.5 decibels, provided that the antenna was lengthen into an approximate measurement of 10 ?.

Different diameters and lengths of directors

Investigations from the National Bureau of Standards concluded that the greater the diameter of the elements of the Yagi Wifi Antenna, the greater the gain that it will produce, given that it has shorter length. In contrast to that, smaller diameter elements will only yield maximum gain if its length is larger.

Spacing and stacking of Yagi Antenna

It has been proven that when antennas are piled up above the other or in broadside, additional gain will be attained. Correspondingly, as the gain increases, the beamwidth of the Yagi Wifi Antenna narrows. In the sense of the spacing in between elements, the closer the spacing is (approximately 0.8 ?), the more the gain to be received from the antenna is reduced for the reason that the mutual impedance increases. Furthermore, the gain can be increased to a maximum level of 2.5 decibels once the spacing in between elements is widened to approximately 1.6 ?.

The concept of stacking denotes assembling of the antennae. An amalgamation of four 0.8 ? yagi antennae yielded a gain of 14.2 decibels. Whereas, a combination of four 4.2 ? yagi wifi antennae produced a gain of 19.6 decibels.

Measured radiation patterns

a. Simplest Yagi Array

The simplest yagi array is comprised of just both the reflector and the driven element. The measures of its beamwidth is 660 and 1110 for the E and H planes, with a radiation of 3 dB.

b. 3-element 0.4 ? antenna

The 3 element yagi antenna is composed of a reflector, a driven element and a single director. Its bandwidth measures 570 and 720 for its E and H planes. The front to side ratio has a radiation level of 24 decibels and 8 decibels for the front to back ratio.

c. 5-element 0.8 ? antenna

The 5 element yagi antenna has a single reflector, one driven element and two directors. Its measured beamwidth is about 480 and 560. The radiation from front to side is basically the same with that of the 3 elements, while the radiation from front to rear is significantly higher than that of the 3 element yagi antenna.

As mentioned earlier, the beamwidth of the antenna is inversely proportionate with the gain. The greater the beamwidth, the lesser the gain. Several designs are to be discussed and their corresponding beamwidth.

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