- Home
- Networking
- CWNA-107
46.
Which of the following refers to the polar chart of an antenna as viewed from above the
antenna? (Choose all that apply)
- A.Horizontal view
- B.Vertical view
- C.H-plane
- D.E-plane
- E.E-plane
- F.Azimuth chart
- Answer & Explanation
- Report
Answer : [A, C, F]
Explanation :
Explanation :
| The Azimuth chart is the top-down view of an antenna’s radiation pattern, also known as the H-plane, or horizontal. The size view is known as the Elevation chart, vertical view, or E-plane. |
47.
The azimuth chart represents a view of an antenna’s radiation pattern from which
direction?
- A.Top
- B.Side
- C.Front
- D.Both top and side
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The azimuth is the top-down view of an antenna’s radiation pattern, also known as the H-plane |
48.
What is the definition of the horizontal beamwidth of an antenna?
- A.The measurement of the angle of the main lobe as represented on the azimuth chart.
- B.The distance between the two points on the horizontal axis where the signal decreases by a third. This distance is measured in degrees.
- C.The distance between the two –3 dB power points on the horizontal axis, measured in degrees.
- D.The distance between the peak power and the point where the signal decreases by half. This distance is measured in degrees.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The beamwidth is the distance in degrees between the –3 dB (half-power) point on one side of the main signal and the –3 dB point on the other side of the main signal, measured along the horizontal axis. These are sometimes known as half-power points. |
49.
Which antennas are highly directional? (Choose all that apply.)
- A.Omni
- B.Patch
- C.Panel
- D.Parabolic dish
- E.Grid
- F.Sector
- Answer & Explanation
- Report
Answer : [D, E]
Explanation :
Explanation :
| A parabolic dish and a grid are highly directional. The rest of the anten- nas are semidirectional, and the sector antenna is a special type of semidirectional antenna. |
50.
Semidirectional antennas are often used for which of the following purposes? (Choose all
that apply.)
- A.Providing short-distance point-to-point communications
- B.Providing long-distance point-to-point communications
- C.Providing unidirectional coverage from an access point to clients in an indoor environment
- D.Reducing reflections and the negative effects of multipath
- Answer & Explanation
- Report
Answer : [A, C, D]
Explanation :
Explanation :
| Semidirectional antennas provide too wide of a beamwidth to support long-distance communications but will work for short distances. They are also useful for providing unidirectional coverage from the access point to clients in an indoor envi- ronment. They can also minimize reflections and thus the negative effects of multipath. |
|
|
||||||||||||||||||||||||||||
