Question
Asked Oct 29, 2019

An antenna has an effective length of 100 m and the current at the base is 450 A (rms) at 40 kHz. What is the power radiated by the antenna?

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Expert Answer

Step 1

The power radiated by the antenna can be expressed as

P R-> (1)
Tms
Radiation resistance of the antenna
Rms value of the current
R
Ime
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P R-> (1) Tms Radiation resistance of the antenna Rms value of the current R Ime

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Step 2

Radiation resistance of the transmitting antenna can be expressed as

R 80
2 (2)
Effective Length of the antenna
1
2 = Wavelength of radiation
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R 80 2 (2) Effective Length of the antenna 1 2 = Wavelength of radiation

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Step 3

In this case, the value of t...

3x10
2 =
7500 m >(3)
40x 10
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3x10 2 = 7500 m >(3) 40x 10

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Electrical Engineering

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