• Ground connections for the module and the capacitors should be kept as short as
possible and with at least one separate through hole connection to the ground layer.
• ESD protection elements should be placed as close as possible to the exposed areas.
Figure 6: Placement of the module with integrated antenna
7.2 Dimensioning of the micro strip antenna line
Figure 7: Dimensioning the antenna feed line as micro strip
The antenna track has to be designed as a 50
Ω
feed line. The width W for a micro strip can
be calculated using the following equation:
W
= 1
.
25
×
5
.
98
×
H
e
50
×
√
r
+1
.
41
87
−
T
met
!
(1)
Ophelia-I reference manual version 1.0
© January 2022
www.we-online.com/wireless-connectivity
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