Shanghai Simcom Ltd.
Mounting SIM900B onto the application platform
Use the connector SUNCAGEY BB530-06001-20R to fix the SIM900B onto the customer
platform
We recommend to use SUNCAGEY Company’s BB530-06001-20R as the board-to-board
connector. They are fully compatible each other. This high density SMT connector is designed for
parallel PCB-to-PCB applications. It is ideal to use in VCRs, notebook PCs, cordless telephones,
mobile phones, audio/visual and other telecommunications equipment where reduced size and
weight are important. Following is parameter of BB530-06001-20R. For more details, you can
login http://www.suncagey.com for more information.
Shanghai Simcom Ltd.
Mechanical dimensions of the SUNCAGEY BB530-06001-20R
Figure 1: SUNCAGEY BB530-06001-20R board-to-board connector
Antenna Interface
The RF interface has an impedance of 50Ω. To suit the physical design of individual applications,
SIM900B offers alternatives:
Recommended approach: antenna connector on the component side of the PCB
Antenna pad and grounding plane placed on the bottom side.
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Figure 2 : The RF interface of module
The antenna can be soldered to the pad, or attached via contact springs.
The RF connector in module side is a ultra small surface mount coaxial connectors (Part Number:
U.FL-R-SMT, vended by HRS). It has high performance with wide frequency range, surface
mountable and reflows solderable. Following is parameter (Figure 36). Certainly the user can visit
http://www.hirose-connectors.com/ for more information.
To get good RF performance in customer’s design, we suggest the customer to use the matching
RF adapter cable which is also supplied by HRS (Part Number: U.FL-LP（V）-040), the following
figure 41 is the dimensions of U.FL series RF adapter cable. The customer can get it from the
cable’s manufacturer HRS, and for details, please visit http://www.hirose-connectors.com/.
Shanghai Simcom Ltd.
Unit:mm
Figure 3: U.FL-R-SMT
Unit:mm
Consideration for antenna selection
SIM900B module is to be used in mobile or fixed applications only. For other antenna(s) selection,
the antenna gain including cable loss must not exceed 7.3 dBi in the 850 MHz Cellular band and
9.0 dBi in the PCS 1900 MHz band, for the purpose of satisfying the requirements of FCC 2.1043
and 2.1091.
Consideration for antenna installation
The antenna used for this module must be installed to provide a separation distance of at least 20
cm from all persons, and must not be co-located or operating in conjunction with other antennas or
transmitters within a host device, except in accordance with FCC multi-transmitter product
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procedures. Compliance of this module in all final product configurations is the responsibility of
the Grantee. OEM integrators must be provided with specific information required to satisfy RF
exposure compliance for all final host devices and installations.
Consideration for antenna maintain
OEM integrators can replace the antenna by themselves. They should comply with Consideration
for antenna selection and Consideration for antenna installation.
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