Directional Antennas

Directional antennas have a higher gain than omnidirectional antennas because they focus the RF energy in one general direction. Typical applications include elongated indoor areas, such as the rooms along a long hallway or the aisles in a warehouse. They can also be used to cover outdoor areas out away from a building or long distances between buildings.

Patch antennas have a flat rectangular shape, as shown in Figure 4-14, so that they can be mounted on a wall.


Figure 4-14 A Typical Cisco Patch Antenna.

Patch antennas produce a broad egg-shaped pattern that extends out away from the flat patch surface. The E and H radiation ...

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