# Radiation from Rectangular Aperture MCQ’s

This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Radiation from Rectangular Aperture”.

1. The radiation pattern of rectangular is similar to line source integrated in two directions

a) True

b) False

2. The total pattern function for rectangular aperture f(x, y) if f(x) and f(y) are separable is given by ____

a) f(x, y)=f(x) f(y)

b) f(x, y)=f(x)+f(y)

c) f(x, y)=f(x)/f(y)

d) f(x, y)=f(x)-f(y)

3. Which of the following antenna belongs to rectangular aperture?

a) Horn antenna

b) Helical antenna

c) Parabolic antenna

d) Conical antenna

4. The first-level of the side lobe occurs at ______ dB for a uniform rectangular aperture antenna.

a) -13.26

b) -6.63

c) 3

d) 8.5

5. The relation between directivity and the effective aperture of the uniform aperture antenna is given by _____

a) D = \frac{4\pi}{\lambda^2}A_{eff}

b) A_{eff} = \frac{4\pi}{\lambda^2}D

c) A_{eff} = \frac{4\pi\lambda^2}{D}

d) D = \frac{4\pi\lambda^2}{A_{eff}}

6. The principle plane pattern of the E-plane of rectangular aperture of a×b is given by F(θ) = ______

a) \frac{sin(0.5kbsin\theta)}{0.5kbsin\theta}

b) \frac{cos(0.5kbcos\theta)}{0.5kbsin\theta}

c) \frac{sec(0.5kbsin\theta)}{0.5kbsin\theta}

d) \frac{1-sin(0.5kbsin\theta)}{0.5kbsin\theta}

7. A rectangular aperture a ×b is placed in xy-plane, The HPBW in H-plane is given by _____

a) 0.886λ/a

b) 0.443λ/a

c) 0.5λ/b

d) λ/b

8. Which of the following is used to reduce side lobe levels in aperture antenna?

a) Tapering

b) Increasing the power

c) Using repeaters

d) Reducing power

9. Tapering is done in order to reduce the side lobe level.

a) True

b) False

10. If the aperture antenna is tapered only in H-plane then which of the following is true compared to uniform non-tapered aperture antenna?

a) Principle patterns in E-plane and H-plane are same in both cases

b) Principle patterns in E-plane and H-plane are different in both cases

c) Principle patterns in E-plane is same and H-plane is different

d) Principle patterns in E-plane is different and H-plane is same

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