Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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How did they get 10000 in working below? Why is the lobe at -10dB?
Transcribed Image Text:A 6 GHz common-carrier microwave communications link uses a tower-mounted antenna with a gain
of 40 dB, and a transmitter power of 5 W. To evaluate the radiation hazard of this system, calculate the
power density at a distance of 20 m from the antenna. Do this for a position in the main beam of the
antenna, and for a position in the side lobe region of the antenna. Assume a worst-case side lobe level
of -10 dB.
Note: The recommended safe power density is as low as 0.2 mW/cm² at the lower RF range of around
100 MHz because the fields penetrate the body more deeply at lower frequencies. Above 15 GHz the
power density limit rises to 10 mW/cm². At 6 GHz the safe limit is 1.2 mW/cm².
Transcribed Image Text:A
Tower mounted
antenna
20m
S = Gt Pt
47 R²
Lobe at -10 dB
=
f = 6GHZ
G=40dB
P₁ = 5W
R= 20m
10 000 x5
47 (201²
S: 0.1m w/cm²
= 9.947 w/m²
9.947x0³
104
≈ /mw/cm²
=
mW/cm²
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