Multi-Tech Systems MTCBA-C-EN-NX User Manual download pdf (Page 53)

Appendix B – Wireless Antenna

Multi-Tech Systems, Inc. MultiModem Wireless Modem with Ethernet Interface (S000375F) 53

Appendix B – Wireless Antenna

The Antenna

The antenna sub-system and integration in the application is a major issue: Choice of antenna (type, length,

performances, thermal resistance, etc.) These elements could affect GSM performances such as sensitivity and

emitted power.

PTCRB Requirements Note:

There cannot be any alteration to the authorized antenna system. The antenna system must be the same

type with similar in-band and out-of-band radiation patterns and maintain the same specifications.

FCC Requirements Note:

The antenna gain, including cable loss, must not exceed 3.0 dBi at 1900 MHz / 1.6 dBi at 850 MHz for

mobile operating configurations and 7.0 dBi at 1900 MHz / 2.3 dBi at 850 MHz for fixed mounted

operations, as defined in 2.1091 and 1.1307 of the rules for satisfying RF exposure compliance.

GSM, EDGE, and CDMA Antenna

The integrated modem antenna connector is a SMA connector. The SMA connector incorporates a 'Screw-on'

action in order to make the connection easier while providing an excellent RF performance. An additional

advantage is its small physical size, which is 50% of the standard MCX connector.

This type of connector is suitable for the standard ranges of flexible and semi-rigid cables. The characteristic

impedance of the MMCX coaxial connector is 50 ohm. The antenna manufacturer must guarantee that the

antenna will be working according to the radio characteristics presented in the table below.

GSM and E-GSM Radio Characteristics

GSM 850 E-GSM 900 GSM 1800 GSM 1900

Frequency RX

869 to 894 MHz 925 to 960 MHz 1805 to 1880 MHz 1930 to 1990 MHz

Frequency TX

824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 MHz

RF Power Stand

2W at 12.5% duty cycle 2W at 12.5% duty cycle 1W at 12.5% duty cycle 1W at 12.5% duty cycle

Impedance 50 ohms

SWR <2

Typical Radiated Gain 0 dBi on azimuth plane

CDMA Radio Characteristics

CDMA 800 CDMA 1900

Frequency RX

869 to 894 MHz 1930 to 1990 MHz

Frequency TX

824 to 849 MHz 1850 to 1910 MHz

Impedance

50 ohms

SWR

Typical Radiated Gain

0 dBi in at least one direction

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 59 60

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Multi-Tech Systems MTCBA-C-EN-NX User Manual Page 53

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