Hardware Development Guide of Module Product
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Figure 7-4 Testing Cable
If the main antenna is accessed by the PDA wielding panel, the RF main antenna
wield pane of the module itself needs to be connected to the antenna interface on
main board via the wield pane and micro stripline or stripline. The micro stripline or
stripline is designed according to the 50ohm impedance, and the dual-L model
matching circuit is reserved.
For the different terminal products, the dimensions are different, the requirements
for the antenna performance are different, so the size and location of antenna are
different as well. Taking the 3G Internet notepad as an example, its antenna space
is recommended to be above 7mm*10mm*100mm, and be placed above the top of
LCD screen.
The design of AGPS antenna is consistent with the main antenna, and its efficiency
index is allowed to be 3dB lower. The separation degree between the main antenna
and the diversity antenna is required to be greater than 12dB.
7.3.2
Precautions During the Initial Design of Antenna
7.3.2.1
Preliminary Evaluation
When choosing the antenna position, make sure that the antenna and the base
station are kept on the horizontal level, so as to reach the highest efficiency. Then,
avoid the place the antenna close to the switch power or data cable, chip or another
device that might result in electromagnetic interference. Place the antenna in a
location that the hand cannot reach, to prevent from the attenuation generated by
the body. Also take into consideration the reduction of radiation and the feasibility of
