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36 MultiModem Cell User Guide

Appendix B - Cellular Information

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 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 RF Specifications

CDMA 800

CDMA 1900

Frequency RX

869 to 894 MHz

1930 to 1990 MHz

Frequency TX

824 to 849 MHz

1850 to 1910 MHz

CDMA 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

Antenna Loss

Free space not to exceed -3dB

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.

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