Specifications

Product Technical Specification & Customer Design Guidelines
44 Proprietary and Confidential - Contents subject to change 4114634
Proximity of host electronics to the antenna in wireless devices can contribute to
decreased Rx performance. Components that are most likely to cause this
include:
Microprocessor and memory
Display panel and display drivers
Switching-mode power supplies
Device-generated RF interference
The module can cause interference with other devices. Wireless devices such as
AirPrime embedded modules transmit in bursts (pulse transients) for set durations
(RF burst frequencies). Hearing aids and speakers convert these burst
frequencies into audible frequencies, resulting in audible noise.
Methods to mitigate decreased Rx performance
It is important to investigate sources of localized interference early in the design
cycle. To reduce the effect of device-generated RF on Rx performance:
Put the antenna as far as possible from sources of interference.
Shield the host device. The module itself is well shielded to avoid external
interference. In most instances, it is necessary to employ shielding on the
components of the host device (such as the main processor and parallel bus)
that have the highest RF emissions.
Filter out unwanted high-order harmonic energy by using discrete filtering on
low frequency lines.
Form shielding layers around high-speed clock traces by using multi-layer
PCBs.
Route antenna cables away from noise sources.
Radiated Spurious Emissions (RSE)
When designing an antenna for use with AirPrime embedded modules, the host
device with an AirPrime embedded module must satisfy the radiated spurious
emission (RSE) test cases described in:
CE/ETSI EN 301 908 (LTE/WCDMA), test numbers 5.3.1 (‘Radiated
Emissions (UE)’)
CE/ETSI EN 301 511 (GSM), test 5.2.16 (‘Radiated Spurious Emissions - MS
allocated a channel’). This test uses the procedure and requirement outlined
in 3GPP 51.010 (GSM) section 12.2.1 of the same test name.
Note that antenna impedance affects radiated emissions, which must be
compared against the conducted 50-ohm emissions baseline. (AirPrime
embedded modules meet the 50-ohm conducted emissions requirement.)
Radiated sensitivity measurement
A wireless host device contains many noise sources that contribute to a reduction
in Rx performance.