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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
90-11Grounding and Shielding
Slots act like small antennas. Because they are antennas, the longer they are, the better they radiate.
Wh
ile
a ha
lf
wa
velength
is ve
ry
e
cient,
as a ru
le
of th
umb,
we li
ke
to li
mit
sl
ots
to
1
20
wavelength or
le
ss
at th
e
hi
ghest
fr
equency
of co
ncern
. Fo
r
10
0
MH
z,
th
is
is 15 cm (a
bout
6 in.); at 30
0
MH
z
(E
SD
fr
equencies),
th
is
dr
ops
to 5 cm (a
bout
2 in.), an
d
at 10
00
MH
z,
it is on
ly
1.5 cm (
2
3
in.). And even these
di
mensions
ma
y
be too la
rge,
as th
ey
on
ly
as
sure
20 dB (1
0-fold)
of sh
ielding
th
rough
th
e
sl
ot
. Cl
early,
ev
en
s
mall
s
lots
a
nd
o
ther
o
penings
m
ean
b
ig
s
hielding
p
roblems
a
t
h
igh
f
requencies
.
e ot
her
wa
y
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Publisher Resources

ISBN: 9781439848913