[SI-LIST] Low permittivity vs. High permittivity

Dear all,

I understand that higher subtrate permittivity the more capacitive it  
is, which means the more capacitive coupling will be introduced. This  
is obviously bad particularly for structures like multi transmission  
line.

What is then the advantage of higher permittivity substrate like  
silicon over lower permittivity substrate like glass?

Many thanks,
Jenni
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