Multi
‐
Tech
Systems,
Inc.
MultiModem
Cell
User
Guide
21
Appendix B - Cellular Information
Antenna
System
for
Cellular
Devices
Wireless
performance
depends
on
implementation
and
antenna
design.
The
integration
of
the
antenna
system
into
the
product
is
a
critical
part
of
the
design
process;
therefore,
it
is
essential
to
consider
it
early
so
performance
is
not
compromised.
If
you
make
changes
to
the
certified
antenna
system
of
the
MultiModem,
then
recertification
is
required
by
specific
network
carriers
such
as
Sprint.
The
antenna
system
is
defined
as
the
UFL
connection
point
from
the
MultiModem
to
the
specified
cable
specifications
and
specified
antenna
specifications.
FCC
Requirements
for
the
Antenna
The
antenna
gain,
including
cable
loss,
for
the
radio
you
are
incorporating
into
your
product
design
must
not
exceed
the
requirements
at
850
MHz
and
1900
MHz
as
specified
by
the
FCC
grant
for
mobile
operations
and
fixed
mounted
operations
as
defined
in
2.1091
and
1.1307
of
the
FCC
rules
for
satisfying
RF
exposure
compliance.
The
antenna
used
for
transmitting
must
be
installed
to
provide
a
separation
distance
of
at
least
20cm
from
all
persons
and
must
not
transmit
simultaneously
with
any
other
antenna
transmitters.
User
and
installers
must
be
provided
with
antenna
installation
instructions
and
transmitter
operating
conditions
to
satisfying
RF
exposure
compliance.
Antenna
Specifications
CDMA/EVDO
Antenna
Requirements/Specifications
Frequency
Range
824
–
894
MHz
/
1850
– 1990
MHz
Impedance
50
Ohms
VSWR
VSWR
shall
not
exceed
2.0:1
at
any
point
across
the
bands
of
operation
Typical
Radiated
Gain
3
dBi
on
azimuth
plane
Radiation
Omni
‐
directional
Polarization
Vertical
TRP/TIS
The
total
radiated
power
(TRP)
at
the
antenna
shall
be
no
less
than
+21/20
dBm
for
PCS/Cell
channels
respectively,
and
the
total
isotropic
sensitivity
(TIS)
at
the
antenna
shall
be
no
less
than
‐
104/104
dBm
for
PCS/Cell
channels
respectively.
