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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
674 Microwave Engineering
In view of the above relation, it can be noted that Z
0
changes (slightly) with
frequency. Similarly, the
ε
e
varies with strip width ‘W’. The effective permit-
tivity also varies with frequency. This change remains conned between nar-
row lines (where the eld is equally distributed in the substrate and air) and
the wide lines (where eld distribution remains conned within the substrate
similar to that in a parallel plate capacitor). Mathematically, it is given by
ε
ε ε
r
e r
+
1
2
(15.33)
The lowest-order transverse resonance cutoff frequency (f
CT
) is given by
the relation:
f
C
w h
r
CT
=
+ε ( . )2 0 8
(15.34)
It occurs when
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Publisher Resources

ISBN: 9781466591417