nepersdb
Post on 08-Dec-2015
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Lecture Nepers and dB
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Nepers and dB
Nepers and dB
The SI units for the attenuation constant (a) are Nepers/meter
In practice, engineers like to express losses in transmission lines in units like dB/meter or (especially for coaxial cable) dB/100 ft.
Lossy Transmission Lines
Nepers and dB
What is the relationship between
Nepers per meter and dB per meter?
If a = 1 Np/m, what is the attenuation
in dB/m? in dB/100 ft?
Lossy Transmission Lines
Nepers and dB
Lossy Transmission Lines
10 1010log exp 2 20log 8.686
1 Np/m 8.686 dB/m
l ea
38.686 dB/m 25.4 10 m/in 1200 in/100 ft 264.7 dB/100 ft
1 Np/m 264.7 dB/100 ft
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