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Hardware Integration Guide
3.2.
Ground Connection
When connecting the mini card to system ground:
Prevent noise leakage by establishing a very good ground connection to the mini card
through the host connector.
Minimize ground noise leakage into the RF. Depending on the host board design, noise could
potentially be coupled to the mini card from the host board. This is mainly an issue for host
designs that have signals traveling along the length of the mini card, or when circuitry
operating at both ends of the mini card interconnects.
3.3.
Shielding Guidelines
The mini card is fully shielded to protect against EMI and to ensure compliance with FCC Part 15 -
"Radio Frequency Devices" (or equivalent regulations in other jurisdictions).
Note:
The module shields must NOT be removed.
3.4.
Antenna Guidelines
3.4.1.
Choosing the Correct Antenna and Cabling
Consider the following points for appropriate antenna selection:
The antenna (and associated circuitry) should have a nominal impedance of 50Ω with a return
loss of better than 10 dB across each frequency band of operation.
The system gain value affects both radiated power and regulatory (FCC, IC, CE, etc.) test
results.
Determining the Antenna's Location
3.4.2.
Consider the following points when deciding where to place the antenna:
Antenna location may affect RF performance. Although the module is shielded to prevent
interference in most applications, the placement of the antenna is still very important—if the
host device is insufficiently shielded, high levels of broadband or spurious noise can degrade
the module's performance.
Connecting cables between the module and the antenna must have 50Ω impedance. If the
impedance of the module is mismatched, RF performance is reduced significantly.
Antenna cables should be routed, if possible, away from noise sources (switching power
supplies, LCD assemblies, etc.) If the cables are near the noise sources, the noise may be
coupled into the RF cable and into the antenna.
4117529
Rev 1.0
RF Integration
June 12, 2015
11
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