Antennas Multiple Choice Questions & Answers (MCQs) on “Design – 2”.
1. HPBW of E-plane horn is (in degrees) _____
a) (frac{56λ}{h_e} )
b) (frac{67λ}{h_e} )
c) (frac{λ}{56h_e} )
d) (frac{λ}{67h_e} )
Answer: a
Clarification: HPBW of E-plane horn is (frac{56λ}{h_e} ) where he the aperture dimension of E-plane horn.
2. HPBW of H-plane horn is (in degrees) _____
a) (frac{56λ}{h_h} )
b) (frac{67λ}{h_h} )
c) (frac{λ}{56h_h} )
d) (frac{λ}{67h_h} )
Answer: b
Clarification: HPBW of H-plane horn is (frac{67λ}{h_h} ) where hh the aperture dimension of H-plane horn.
3. HPBW of E-plane horn with aperture dimension 10 λ in degrees is ____
a) 56
b) 67
c) 5.6
d) 6.7
Answer: c
Clarification: HPBW of E-plane horn is (frac{56λ}{h_e} = frac{56λ}{10λ}=5.6).
4. HPBW of E-plane horn with aperture dimension 10 λ in degrees is ____
a) 56
b) 67
c) 5.6
d) 6.7
Answer: d
Clarification: HPBW of H-plane horn is (frac{67λ}{h_h} = frac{67λ}{10λ}=6.7).
5. What is the physical area of the rectangular horn antenna with E-plane aperture 5 λ and H-plane aperture 4 λ?
a) 20λ2
b) 10λ2
c) 0.8
d) 9 λ
Answer: a
Clarification: The physical area of rectangular horn is A = hh×he=5λ×4λ=20 λ2
6. Physical area of a conical horn antenna of radius 5cm is____
a) 25π
b) 6.15π
c) 2.5π
d) 25
Answer: a
Clarification: Physical area of conical horn A=πr2=π×52=25π.
7. Flare angle of horn antenna when axial length l and path difference δ is given is _____
a) (θ= 2 cos^{-1}frac{l}{l+δ} )
b) (θ= cos^{-1}frac{l}{l+δ} )
c) (θ= 2 cos^{-1}frac{l}{l-δ} )
d) (θ= cos^{-1}frac{l}{l-δ} )
Answer: a
Clarification: Flare angle of horn antenna when axial length l and path difference d is given is
(θ= 2 cos^{-1}frac{l}{l+δ} ).
8. Flare angle (in degrees) of horn antenna when axial length 10λ and path difference δ = 0.3λ is given is _____
a) θ = 1.386
b) θ = 2.772
c) θ = 27.72
d) θ = 13.86
Answer: c
Clarification: Flare angle of horn antenna when axial length l and path difference d is given is
(θ = 2 cos^{-1}frac{l}{l+δ}=2 cos^{-1}frac{10λ}{10.3λ}=27.72)