Question
Asked Nov 14, 2019
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A vertical grounded antenna is constructed to operate at 20 MHz. What will be its radiation resistance if the effective antenna height is 65 m?

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Expert Answer

Step 1

Write the expression for radiation resistance of the antenna as follows:

807
(1)
Tad
Here
l is the effective height of the antenna, which is 65 m and
a is the wavelength of the antenna
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807 (1) Tad Here l is the effective height of the antenna, which is 65 m and a is the wavelength of the antenna

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Step 2

Write the expression for wavelength of the antenna as follows:

(2)
f
Here
c is the velocity of the light, which is 3x108 m/s and
fis the operating frequency of the antenna, which is 20 MHz
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(2) f Here c is the velocity of the light, which is 3x108 m/s and fis the operating frequency of the antenna, which is 20 MHz

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Step 3
Substitute 3x108 m/s for c and 20 MHz for fin Equation (2)
3x108 m/s
20MHZ
3x105 m/s
20x100 Hz
=15 m
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Substitute 3x108 m/s for c and 20 MHz for fin Equation (2) 3x108 m/s 20MHZ 3x105 m/s 20x100 Hz =15 m

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