Q9. What type of antenna, commonly used in small office wireless Access Points and wireless routers, radiates uniformly in all directions?
A. Unidirectional
B. Semi directional
C. Parabolic
D. Omnidirectional
Correct Answer: D. Omnidirectional
Explanation:
There are three main categories of antennas:
Omni-directional - Omni-directional antennas radiate RF in a fashion similar to the way a table or floor lamp radiates light. They are designed to provide general coverage in all directions.
Semi-directional - Semi-directional antennas radiate RF in a fashion similar to the way a wall sconce is designed to radiate light away from the wall or the way a street lamp is designed to shine light down on a street or a parking lot, providing a directional light across a large area. Yagi antenna is an example of this type of antennas.
Highly-directional - Highly-directional antennas radiate RF in a fashion similar to the way a spotlight is designed to focus light on a flag or a sign. Each type of antenna is designed with a different objective in mind. Phased array antenna is an example of this type of antenna.
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