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Implementing Cisco Networking Solutions by Harpreet Singh

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Antenna characteristics

The RF signals are transmitted using an antenna that converts the electrical signals into RF waves in the air. An ideal antenna will radiate in all directions and the radiation pattern will be a sphere. Such an antenna is called an isotropic antenna.

In a WLAN deployment, the clients are located in one plane, and hence the antenna needs to radiate in one plane only. The antenna that radiates and receives signals from all directions in one plane is called an omnidirectional antenna. These antennae are generally used for indoor WLAN deployments. A dipole is the most common form of an omnidirectional antenna that has a radiation pattern that is 360 degrees in the horizontal plane and 75 degrees in the vertical plane, ...

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