Hi Allen,
In short, I would not recommend changing PCB materials for a narrow-band
application without verification. Surface roughness causes changes to DK as
well as the copper attenuation, and the change in DK can be as much as 10%
in low quality materials. Studies have recognizing the DK change due to
surface roughness. However to the best of my knowledge, prediction
methodologies related to the DK shift are not reliable at this time.
Cheers,
Jason
Employed by and affiliated with Amphenol AICC (https://www.amphenol-icc.com/
)
On Wed, Sep 18, 2019 at 11:25 PM Allen <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Greetings all,
I have a different question regarding PCB materials for RF design topic.
surface resistivity is one of the parameter that we would encounter
different value when substitute an RF Board Material to a closest
equivalent.
we could see slight difference in laminate slash sheet construction,
difference in value of more than one electrical parameter like moisture
absorption, DF, DK, surface resistivity, so even if the substituted
material is better than previous material, I assume it will change antenna
power out performance/matching and might require redesign?
is it even a practical to substitute A PCB Material to B without requiring
re-matching ?
your experience on this subject would be a great source for
learning. Thanks regardsAllen
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