BIM-418-40 Radiometrix, BIM-418-40 Datasheet - Page 8

• Manufacturer Part Number: BIM-418-40
• Description: (BIM-418-40 / BIM-433-40) Low Power UHF Data Transceiver Module
• Manufacturer: Radiometrix

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Antenna selection chart
The antenna choice and position directly controls the system range. Keep it clear of other metal in the
system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is
often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an
internal antenna must be used try to keep it away from other metal components, particularly large ones
like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important
as the antenna itself.
Radiometrix Ltd, BiM Data Sheet
figure 6: Antenna configurations
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
B . Loop antenna
C. W hip antenna
A. Helical antenna
15.5cm
C3
C4
C2
R F
R F
C1
R F -G N D
R F
0.5 m m enam eled copp er w ire
close w oun d on 3.2 m m diam eter form er
433 M H z = 24 turns
w ire, ro d, P C B -track or a com bination
of these th ree
433 M H z = 15 .5 cm total from a nte nna pin 2.
A
helical
**
**
***
**
80m
Track w idth = 1m m
4 to 10 cm insid e are a
2
B
loop
*
*
**
***
50m
C
whip
***
***
*
*
120m
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