Antennas Multiple Choice Questions on “Flat Sheet Reflector”.
1. Which of the following statements is false for flat reflector?
a) Plane reflector is used to reduce the backward radiation
b) Increases the gain in forward direction
c) A large flat sheet placed in front of dipole increases the directivity
d) Decreases the gain in forward direction
Answer: d
Clarification: A plane or a flat reflector is used to radiate energy in desired direction by placing a feed in front of it. It reduces the backward radiation and increases the gain in the forward direction. A reflector antenna is a high gain antenna.
2. A corner reflector is converted to plane reflector when the corner angle is ______
a) 90°
b) 180°
c) 45°
d) 60°
Answer: b
Clarification: For a corner reflector to become a plane reflector the corner angle must be 180°.
For a plane reflector N (current element) =1
(α=frac{π}{N}=π.)
3. Which of the following reflector antenna is formed by joining two plane reflectors at some angle (≠nπ)?
a) Corner
b) Parabolic
c) Cheese
d) Truncated
Answer: a
Clarification: By joining two plane sheet reflectors at some angle we get the corner antenna. A plane or a flat reflector is used to radiate energy in desired direction by placing a feed in front of it. Cheese and Truncated are types of parabolic antenna.
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