Discussion
What does the Friis transmission equation relate?
Answer: A
The Friis equation gives the received power in a free space link from the transmitted power, both antenna gains, the wavelength and the separation, and it is the foundation of every link budget. Terminal current relates to radiated power through the radiation resistance, field strength and antenna height belong to ground wave propagation formulas, and noise temperature is a separate calculation. The equation assumes free space, matched polarisation and far field conditions, and every departure is added as a further term.
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