Hardware Development Guide of Module Product
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its structure. Therefore, during the initial design, make the layout evaluation with the
structure, ID, circuit and antenna engineers together.
7.3.2.2
Suggested Antenna Location
For the notepad, the ideal location position for the antenna is on the left corner or
right corner of LCD, because this position is relatively far away from the main board,
so the electromagnetic interface is little. Besides, this position is relatively far away
from the human body, so the SAR index can be easily satisfied. Another suggested
position is on the left or right of LCD. For the other products such as the router or
electronic book, make the evaluation according to the feature of the product itself.
7.3.2.3
Suggested Antenna Occupancy Space
As different antenna manufacturers might adopt different antenna modes, the
reserved space of the antenna is also different. Taking the 3G Internet laptop as an
example (coverage frequency: W2100/W1900/W900/W850, GSM850/GSM900/
GSM1800/GSM1900), it is recommended to set the antenna size as 5mm (width) *
12mm (width) * 80mm (length).
7.3.2.4
Main Board Layout
The interference on the main board area is very strong. According to the testing
result, when the module is placed in these interference areas, its performance
becomes poorer. When designing the notepad, it’s better to separate the module
form the main board PCB, instead of installing the module on the main board. If they
are not separated, the module should better be far away from the chip, storage,
power interface, data cable interface and other module or device that might
generate EMI.
7.3.2.5
Antenna RF Connection Cable
The RF connection cable of the antenna should better be short. Taking
consideration of the transmission power los, it is recommended to adopt a thicker
RF cable. At the same time, the RF cable should better be far away from FSB, chip
and storage, power interface, data cable interface, and other modules or devices
that might generate EMI. The connection antenna and the RF connection cable of
