(c) A message is converted to an electromagnetic wave (EM) to be launched into free space using an antenna. If the frequ

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C A Message Is Converted To An Electromagnetic Wave Em To Be Launched Into Free Space Using An Antenna If The Frequ 1 (80.11 KiB) Viewed 16 times

(c) A message is converted to an electromagnetic wave (EM) to be launched into free space using an antenna. If the frequency of t EM wave is 10 kHz and the length L (m) of the antenna must b such that L = 1/4, where ` is the wavelength of the EM wave. Determine the length of the antenna and explain how the Leng the antenna may be reduced by modulation. You may assume tl the speed of light is C = 3x109 m/s Solution: (d) A voltage signal has the finite Fourier series representation: v(t) = 20 + 16 cos (314.16t +30° + 6 sin(2, 100t) (i) Sketch to scale the double-sided amplitude line spectrum o the signal Solution: (ii) Use Parseval's theorem to determine the average power in signal. Solution: Tota