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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
261Microwave Components
If E is the amplitude of the input signal, A is the amplitude of output sig-
nal,
θ
is the angle between end cards and the central card and E is parallel to
the central card then the output can be given by A = E cos
2
θ
. The attenuation
(in dBs) = 20 log
10
{E/(E cos
2
θ
)} = 20 log
10
(s
2
θ
). This attenuation is a function of
frequency.
Another class of attenuator called coaxial cutoff attenuator is shown in
Figure 7.43. It contains two coupling loops separated by a cutoff section.
The variable attenuators present two problems. First, just as xed pads,
they are frequency sensitive; thus, it is necessary to calibrate them at ...
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Publisher Resources

ISBN: 9781466591417