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Microwave Engineering
book

Microwave Engineering

by Ahmad Shahid Khan
May 2014
Intermediate to advanced content levelIntermediate to advanced
800 pages
24h 50m
English
CRC Press
Content preview from Microwave Engineering
27Fundamentals of Wave Propagation
δ
α ωµσ
=
1 2
(2.17)
2.9 Surface Impedance
At high frequency the ow of current is almost entirely conned to a very
thin layer of the surface of the sheet of a conductor. The impedance (Z
s
)
offered by the surface to the ow of current is referred to as surface imped-
ance Z
s
and is given by
Z
j j
R jX
s s s
= = = = +
( )ωµσ
σ
ωµ
σ
η
(2.18)
Where
R X
s s
= =
ωµ
σ2
(2.19a)
In view of Equation 2.17, Equation 2.19a can be written as
R X
s s
= =
1
( )σδ
(2.19b)
2.10 Poynting Theorem
The rst Maxwell’s Equation 2.1a can be manipulated to yield the relation:
( ) ( )E J d
t
H
d
t
E
d E H ds
s
ν ν ν
ν
µ
ν
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Publisher Resources

ISBN: 9781466591417