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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
Impedance
VSWR
Typical Radiated Gain
Radiation
Polarization
TRP/TIS
Multi-Tech Systems, Inc. MultiModem Cell User Guide
824 – 894 MHz / 1850 – 1990 MHz
50 Ohms
VSWR shall not exceed 2.0:1 at any point across the bands of operation
3 dBi on azimuth plane
Omni-directional
Vertical
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.
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