Module 9.2: Communication Link

Given: A 300-MHz communication system that utilizes vertically oriented half-wavelength long dipoles on both the transmitter and receiver ends of a 10-km link.

Q1.	How long are the dipole antennas?
	l=	m
Q2.	Assuming the transmitter source is a sinusoidal voltage generator with an amplitude of 300 V, and assuming that each dipole is tuned to exhibit an approximately purely real impedance of 75 , what is the amplitude of the current exiting the transmitter dipole antenna?
	It0=	A
Q3.	What is the average power density of the wave incident upon the receiving dipole antenna?
	Si=	W/m2
Q4.	What is the corresponding power intercepted by the receiving dipole antenna?
	Pint=	nW
Q5.	If the receiver circuit is designed to exhibit an equivalent input impedance ZL= 75 , so as to match it to the receiving antenna and the in-between transmission line, what is the amplitude of the current flowing through ZL?
	IL0=	A

Proceed to Module 9.3

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Fawwaz T. Ulaby, Fundamentals of Applied Electromagnetics. Prentice Hall, Upper Saddle River, New Jersey, 2001. Copyright © 2001 Prentice Hall.

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