Omnidirectional Antennas
An omnidirectional antenna is usually made in the shape of a thin cylinder. It tends to propagate a signal equally in all directions away from the cylinder, but not along the cylinder’s length. The result is a donut-shaped pattern that extends further in the H plane than the E plane. This type of antenna is well suited for broad coverage of a large room or floor area where the antenna is located in the center. Because an omnidirectional antenna distributes the RF energy throughout a broad area, it has a relatively low gain.
A common type of omnidirectional antenna is the dipole, shown in the left portion of Figure 4-7. Some dipole models are articulated such that they can be folded up or down, depending on the mounting ...
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