User's Guide

50 Antenna selection: Shielding
Integrator’s Guide – RIM 902M OEM Radio Modem
Shielding
The electrical design of the RIM 902M provides high immunity to RF noise.
The metal casing also acts as a shield to help minimize the effect of RF
interference originating from the computing device to which it is attached, and
to prevent the RIM 902M from emitting RF energy into the computing device
and disrupting the computing device’s operation.
Consequently, you do not need to provide any additional RF shielding between
the RIM 902M and a computing device. In fact, it would be more important for
the power supply to the RIM 902M to be free of high-frequency electrical noise,
than to provide additional RF shielding.
The antenna must be positioned in such a way that the radiated energy is
directed away from the computing device. If this is not possible, then RF
shielding may be required between the antenna and the computing device.
Note that circuits with a high impedance, and sensitive analog circuits, are
especially vulnerable to nearby radio frequency emissions, and may need to be
shielded. Typically affected circuits include CRTs and LCD display drivers.
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