Reflow Temperature Profile - Fibocom G610 Hardware User Manual

Do not place antenna in close vicinity to end user since the emitted radiation in human tissue is
limited by S.A.R. regulatory requirements.
Do not use directivity antenna since the electromagnetic field radiation intensity is limited in
some countries.
Take care of interaction between co-located RF systems since the GSM transmitted power may
interact or disturb the performance of companion systems.
Place antenna far from sensitive analog systems or employ countermeasures to reduce
electromagnetic compatibility issues that may arise.
The modules are designed to work on a 50 Ω load. However, real antennas have no perfect 50
Ω load on all the supported frequency bands. To reduce as much as possible performance
degradation due to antenna mismatch, the following requirements should be met:
Measure the antenna termination with a network analyzer: connect the antenna through a
coaxial cable to the measurement device, the |S11| indicates which portion of the power is delivered
to antenna and which portion is reflected by the antenna back to the modem output.
A good antenna should have a |S11| below -10 dB over the entire frequency band. Due to
miniaturization, mechanical constraints and other design issues, this value will not be achieved. A
value of |S11| of about -6 dB - (in the worst case) - is acceptable.

5.4 Reflow temperature profile

G610 GPRS Module Hardware User Manual Page 44 of 47