The animated TECHTip Tutorial is available here.

This is an animated tutorial on wireless RF [Radio Frequency] propagation critical to successful wireless transmission and reception.

Linear Polarization is the direction of the E [Electric] field of the EM [ElectroMagnetic] wave in the form of:

• Vertical - perpendicular to the earth (ground),

• Horizontal - parallel to the earth (ground),
• Oblique,
• Cross (signals on the same frequency but polarized differently)

In other words, if you have one antenna with a Vertical Polarization and the other with a Horizontal Polarization, the antenna gain is “crossed” against each antenna or minimized. That is, the Vertical Antenna gain (strength) is maximized in the opposite direction from the Horizontal Antenna.

Yagi performance gain can be increased at certain frequencies by adding equal spaced, equal length Directors but the bandwidth is narrower and Side Lobe levels are increased. Large Director spacing will increase the bandwidth. By varying both the spacing and Director lengths the gain pattern and the pattern bandwidth may be more controlled. While Yagi’s are common in Amateur Radio, they are also used in many Wi-Fi [Wireless-Fidelity] applications.

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[tags]wi-fi,techtionary,wireless antenna polarization,rf propogation[/tags]