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W S N 8 0 2 G C O u tlin e a n d M o u n tin g D im e n s io n s
1 .0 5 0
0 .0 5 0
0 .0 4 0
1 5
0 .0 3 0
1
0 .1 2 5
1 6
0 .0 5 0
T o p V ie w
3 0
0 .9 8 5
0 .0 9 0
D im e n s io n s in in c h e s
Figure 2
WSN802G Antenna Connector
A U.FL miniature coaxial connector is provided on both WSN802G configurations for connection to the RFIO port.
A short U.FL coaxial cable can be used to connect the RFIO port directly to an antenna. In this case the antenna
should be mounted firmly to avoid stressing the U.FL coaxial cable due to antenna mounting flexure. Alternately,
a U.FL coaxial jumper cable can be used to connect the WSN802G module to a U.FL connector on the host cir-
cuit board. The connection between the host circuit board U.FL connector and the antenna or antenna connector
on the host circuit board should be implemented as a 50 ohm stripline. Referring to Figure 3, the width of this
stripline depends on the thickness of the circuit board between the stripline and the groundplane. For FR-4 type
circuit board materials (dielectric constant of 4.7), the width of the stripline is equal to 1.75 times the thickness of
the circuit board. Note that other circuit board traces should be spaced away from the stripline to prevent signal
coupling, as shown in Figure 4. The stripline trace should be kept short to minimize its insertion loss.
C ir c u it B o a r d S tr ip lin e T r a c e D e ta il
C o p p e r
S tr ip lin e
T ra c e
Trace Separation from
50 ohm Microstrip
100 mil
150 mil
200 mil
Length of Trace Run
Parallel to Microstrip
125 mil
200 mil
290 mil
C o p p e r
G ro u n d
P la n e
F R -4 P C B
M a te r ia l
F o r 5 0 o h m
im p e d a n c e W
= 1 .7 5 * H
250 mil
300 mil
450 mil
650 mil
Figure 3
www.RFM.com E-mail: info@rfm.com
?2009 by RF Monolithics, Inc.
Figure 4
Page 5 of 7
WSN802G - 04/29/09
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