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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
38-6 Electromagnetic Variables
38.3.2 Aperture Antennas
Aperture antennas are commonly used for receiving and transmitting at microwave frequencies (above
1 GH
z)
. As re
ceiving
an
tennas,
th
ey
ar
e
co
nveniently
ch
aracterized
by th
eir
on
-axis
ga
in
g or e
ective
ar
ea
A
e
. Eective area is dened as the ratio of the received power P
r
to the incident power density S
inc
and can also be written in terms of the gain [9]:
A
P
S
g
eff
r
inc
= =
λ
π
2
4
(3
8
.9)
E
quation
38.9 ap
plies
to th
e
ca
se
wh
ere
th
e
in
cident
e
ld
is po
larization
ma
tched
to th
e
re
ceiving
an
tenna
. e in
cident
po
wer
de
nsity
in a pl
ane
wa
ve
is S
inc
= E
2
/η
0
, where E is the rms electric-eld
strengt ...
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Publisher Resources

ISBN: 9781439848913