Radiometrix Ltd, BIM2/3G Data Sheet

page 6

Typical RSSI characteristic is shown below (this is for indicative purposes only and is not a guarantee

of actual RSSI characteristics):

200

300

400

500

600

700

800

900

1000

1100

-130

-120

-110

-100

-90

-80

-70

-60

-50

RF input level (dBm)

Module mounting considerations

Good RF layout practice should be observed – in particular, any ground return required by the antenna or feed

should be connected directly to the RF GND pin at the antenna end of the module, and not to the OV pin which

is intended as a DC ground only. All connecting tracks should be kept as short as possible to avoid any

problems with stray RF pickup.

If the connection between module and antenna does not form part of the antenna itself, it should be made using

50

Ω microstrip line or coax or a combination of both. It is desirable (but not essential) to fill all unused PCB

area around the module with ground plane.

The module may be potted if required in a viscous compound which cannot enter the screen can

.

Figure 3: Typical RSSI