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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
Figure 3
= 1 .7 5 * H
250 mil
300 mil
Figure 4
450 mil
650 mil
that this connection be implemented as a 50 ohm stripline. Referring to Figure 3, the width of this stripline de-
pends 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.
D N T 2 4 0 0 P O u tlin e a n d M o u n tin g D im e n s io n s
2 .0 5 0
0 .0 5 0
0 .0 4 0
0 .1 0 0
1
1 .3 6 0
4 0
0 .2 8 5
0 .3 3 3
D im e n s io n s in in c h e s
Figure 5
www.RFM.com E-mail: info@rfm.com
?2009 by RF Monolithics, Inc.
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DNT2400 - 08/12/09
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