Antenna Bandwidth MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Antenna Bandwidth”.

1. What is the Bandwidth of the antenna operating at resonant frequency 200MHz with Quality factor 20?
a) 10Hz
b) 5MHz
c) 10MHz
d) 0.1MHz

2. What is the length of the half-wave dipole with bandwidth 20MHz and Quality factor 30?
a) 5m
b) 0.25m
c) 0.50m
d) 2.5m

3. Relation between Quality factor, Bandwidth, and resonant frequency is _________
a) Q=\frac{BW}{f_0}
b) Q=\frac{f_0}{BW}
c) Q = BW×f0
d) Q=\frac{BW+f_0}{BW-f_0}

4. Quality factor is defined as ________
a) 2π×\frac{energy \,radiated\, per\, cycle}{Total\, energy\, stored\, by\, antenna}
b) 4π×\frac{Total \,energy \,stored \,by\, antenna}{energy\, radiated\, per \,cycle}
c) 4π×\frac{energy \,radiated\, per \,cycle}{Total \,energy\, stored \,by \,antenna}
d) 2π×\frac{Total \,energy\, stored\, by \,antenna}{energy\, radiated \,per \,cycle}

5. In an antenna, the lower frequency limit is determined by pattern, gain or impedance.
a) True
b) False

6. High the Fractional Bandwidth ___________ is the quality factor.
a) low
b) high
c) constant
d) infinity

7. What is the quality factor of the antenna operating at 650MHz and having a bandwidth of 10MHZ?
a) 65
b) 0.65
c) 15
d) 55

8. In the impedance v/s frequency graph of antenna, the antenna impedance at frequencies less than resonant frequency is ____
a) inductive
b) capacitive
c) resistive
d) both inductive and capacitive

9. For lower Quality factor antennas, the bandwidth is very high.
a) True
b) False

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