A polyethylene coaxial cable has ,

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electromagnetic waves and their propagation · Electromagnetic waves and their propagation

Modes, Packets and Media, Ch Transmission lines and electromagnetic waves in matter, plasmas and guides

Problem

A polyethylene coaxial cable has L′=250 nH m−1L' = 250\,\mathrm{nH\,m^{-1}}, C′=100 pF m−1C' = 100\,\mathrm{pF\,m^{-1}}, series resistance R′=0.57 Ω m−1R' = 0.57\,\Omega\,\mathrm{m^{-1}} and shunt conductance G′=1.26 μS m−1G' = 1.26\,\mu\mathrm{S\,m^{-1}}, all measured at the same frequency. Treat the line as low-loss. ((a)) Find the characteristic impedance Z0Z_0. ((b)) Find the attenuation constant α\alpha in nepers per metre. ((c)) Express the attenuation over 100 m100\,\mathrm{m} of cable in decibels.

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