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SR/AI
SR/AP
Hardware Reference
Release r09
Page 52 of 76
6.4 Placement Recommendation
To achieve best radio performance for SR/AI, it is recommended to use the placement
shown in Figure 19. This is a
“corner placement” meaning the SR is placed such that the
antenna comes close to the corner of the application PCB (red area). So, the yellow area is outside
the PCB and regards to the housing, too (refer to 6.5).
Please note that for best possible performance the antenna should be directed away from the
application PCB as shown in Figure 19.
max.0,5
4,5
10
10
m
a
x.
0
,5
10
15
no bare copper (exept solder pads for module)
no copper and components on any layer
no components on any layer
provide solid ground plane(s) as large as possible around
17
do not place any conductive parts in this area
20
20
40
area
Applic. PCB
Figure 19: SR/AI Placement Recommendation
6.5 Housing Guidelines
The individual case must be checked to decide whether a specific housing is suitable for the use of
the internal antenna. A plastic housing must at least fulfill the following requirements:
Non-conductive material, non-RF-blocking plastics
No metallic coating
ABS is suggested
6.6 Antenna Issues
SR is shipped with 2 different antenna designs:
SR/AI comprises a ceramic antenna which as a component is soldered to the
circuit board. This is functional for a SR/AI integrated into a plastic housing. No
additional antenna is required.
For an external antenna to be set in, e.g. because the SR is integrated into a metal
housing, the ceramic antenna is replaced.
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