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A baseband signal of 3.5 MHz frequency is modulated with a carrier signal of 3.5 GHz frequency using amplitude modulation method. What should be the minimum size of antenna required to transmit the modulated signal?     

Option 1 -

42.8 m

Option 2 -

42.8 mm

Option 3 -

21.4 mm

Option 4 -

21.4 m

0 2 Views | Posted 3 months ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    3 months ago
    Correct Option - 3


    Detailed Solution:

    Baseband Signal frequency 3.5 MHz

    & Carrier signal frequency = 3.5 GHz

    υ C = 3 . 5 G H z = 3 . 5 × 1 0 9

    λ = C υ c = 3 × 1 0 8 3 . 5 × 1 0 9 = 3 3 . 5 × 1 0

    = 3 0 3 5 × 1 0

    = 6 0 7

    Size of antenna = λ 4 = 6 0 7 × 4

    = 21.4 mm

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