your position is our focus
Figure 45: Micro strip on a 2-layer board (Agilent AppCAD Coplanar Waveguide)
ng
(35µm)
plus
the
plated
cupper
(typically
25µm).
Figure 45
shows
an
example
of
a
2-layer
FR4
board
of
1.6
mm
thickness
and
a
35µm
(1
once)
copper
cladding.
The
thickness
of
the
micro
strip
is
comprised
of
the
claddi
Figure 46
depicts
an
example
of
a
multi
layer
FR4
board
with
18µm
(½
once)
cladding
and
180µ
dielectric
between
layer
1
and
2.
Figure 46: Micro strip on a multi layer board (Agilent AppCAD Coplanar Waveguide)
3.6.6 Antenna Bias Voltage on NEO-4S and LEA-4M
NEO-4S
and
LEA-4M
do
not
provide
the
antenna
bias
voltage
for
active
antennas
at
the
RF_IN
pin.
It
is
therefore
necessary
to
provide
this
voltage
outside
the
module
via
an
inductor
as
indicated
in
Figure 62
.
For
optimal
performance,
it
is
important
to
place
the
inductor
as
close
to
the
microstrip
as
possible.
Figure 47
illustrates
the
recommended
layout
and
also
shows
an
example
of
how
it
should
not
be
done.
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Design-In
GPS.G4-MS4-05007-A1
Page 57
