NEO-5
-
Hardware
Integration
Manual
Preliminary
Design-In
GPS.G5-MS5-08003-A2
u-blox
proprietary
Page 24
your position is our focus
Figure 13: Micro strip on a 2-layer board (Agilent AppCAD Coplanar Waveguide)
shows
an
example
of
a
2-layer
FR4
board
of
1.6
mm
thickness
and
a
35
μ
m
(1
once)
copper
cladding.
The
thickness
of
the
micro
strip
is
comprised
of
the
cladding
(35
μ
m)
plus
the
plated
cupper
(typically
25
μ
m).
depicts
an
example
of
a
multi
layer
FR4
board
with
18
μ
m
(½
once)
cladding
and
180
μ
dielectric
between
layer
1
and
2.
Figure 14: Micro strip on a multi layer board (Agilent AppCAD Coplanar Waveguide)
2.8 Antenna and Antenna Supervisor
u-blox
5
modules
receive
L1
band
signals
from
GPS
and
GALILEO
satellites
at
a
nominal
frequency
of
1575.42
MHz.
The
RF
signal
is
connected
to
the
RF_IN
pin.
u-blox
5
modules
can
be
connected
to
passive
or
active
antennas.
For
u-blox
5
receivers,
the
total
preamplifier
gain
(minus
cable
and
interconnect
losses)
must
not
exceed
50
dB.
Total
noise
figure
should
be
below
3
dB.
2.8.1 Passive
Antenna
A
design
using
a
passive
antenna
requires
more
attention
regarding
the
layout
of
the
RF
section.
Typically
a
passive
antenna
is
located
near
electronic
components;
therefore
care
should
be
taken
to
reduce
electrical
‘noise’
that
may
interfere
with
the
antenna
performance.
Passive
antennas
do
not
require
a
DC
bias
voltage
and
can
be
directly
connected
to
the
RF
input
pin
RF_IN
.
Sometimes,
they
may
also
need
a
passive
matching
network
to
match
the
impedance
to
50
Ohms.
