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Appendix B - Cellular Information
4B
Antenna System for Cellular Devices
The cellular/wireless performance is completely dependent on the 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 the
performance is not compromised. If changes are made to the certified antenna system of the MultiModem, then recertification
will be 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 RF Specifications
CDMA 800
CDMA 1900
Frequency RX
Frequency TX
869 to 894 MHz
824 to 849 MHz
1930 to 1990 MHz
1850 to 1910 MHz
CDMA Antenna Requirements/Specifications
Frequency Range
Impedance
VSWR
Typical Radiated Gain
Radiation
Polarization
Antenna Loss
TRP/TIS
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
Free space not to exceed -3dB
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.
GSM/EGSM RF Specifications
GSM 850
EGSM 900
GSM 1800
GSM 1900
Frequency RX
Frequency TX
869 to 894 MHz
824 to 849 MHz
925 to 960 MHz
880 to 915 MHz
1805 to 1880 MHz
1710 to 1785 MHz
1930 to 1990 MHz
1850 to 1910 MHz
24
Multi-Tech Systems, Inc. MultiModem Cell User Guide
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