Antennas Multiple Choice Questions on “Types”.
1. For a horn antenna, in which flaring is done only in one direction is ________
a) Conical antenna
b) Sectoral antenna
c) Pyramidal horn antenna
d) Exponential horn antenna
Answer: b
Clarification: In Sectoral horn antenna, flaring is done only in one direction. Depending on the flaring direction with respect to field propagation, it is divided into E-plane or H-plane horn antenna. Conical horn flared cross section is in shape of a cone.Pyramidal horn flared cross section is in shape of a four-sided pyramid. In exponential horn, the separation of sides increases as a function of length.
2. If flaring is done in the boarder direction of the rectangular waveguide then it is called ______
a) E-plane horn
b) H-plane horn
c) Conical horn
d) Pyramidal horn
Answer: a
Clarification: If the flaring is done in the electric field that means in the boarder direction of the rectangular waveguide, then it is called E-plane horn antenna.
3. If flaring is done in the magnetic field direction of the rectangular waveguide then it is called ______
a) E-plane horn
b) H-plane horn
c) Conical horn
d) Pyramidal horn
Answer: b
Clarification: In Sectorial horn antenna, flaring is done only in one direction.If the flaring is done in the magnetic field direction, then it is called H-plane horn antenna.
4. Which of the following antenna has the parallel slots along the inside surface of the horn?
a) E-plane horn
b) Pyramidal horn
c) Exponential horn
d) Corrugated horn
Answer: d
Clarification: A Corrugated horn has parallel slots or grooves which are small in size compared to the wavelength. These are present along the inside surface of the horn and are transverse to the axis.These corrugated antennas have wider bandwidths and minimizes the side lobes.
5. In which of the following antennas the separation of sides increases as a function of length?
a) Conical horn
b) Exponential tapered pyramidal horn
c) Pyramidal horn
d) Sectoral horn
Answer: b
Clarification: In exponentially tapered pyramidal horn, the transition region is gradually tapered exponentially to minimize the reflections. These are mainly used when reflections in the waveguide are critical.
6. If the walls of the circular waveguide are flared out, then it is called _____
a) Pyramidal horn
b) E-plane horn
c) H-plane horn
d) Conical horn
Answer: d
Clarification: In conical horn, the walls of the circular waveguide are flared out. For pyramidal horn, the walls of the rectangular waveguide are flared out in both directions.
7. If the all the walls of rectangular waveguide are flared out, then it is called ______
a) Pyramidal horn
b) Conical horn
c) E-plane horn
d) H-plane horn
Answer: a
Clarification: For pyramidal horn, all the walls of the rectangular waveguide are flared out. E-plane and H-plane are Sectoral horn antennas which are flared in only one direction.
Global Education & Learning Series – Antennas.