On Mon, 12 Feb 2007 14:17:50 GMT, Fred Bloggs Gave us:
>
> snipped-for-privacy@netzero.com wrote:
>> >>
>>>I think transmitting high-speed signals is very easy when you have a
>>>360-degree ground reference, round conductors,
>>>and no other nearby signals like in coaxial cables. My aim is to design PCB
>>>tracks as much like a coaxial cable as
>>>possible. Anyone tried this before? Is it possible with regular FR4, anyway?
>>>Thanks for your help.
>>>
>>>Gero
>>
>>
>> You can build a wave guide out of a multi-layer board with lots of
>> micro vias. The performance gain was non-existent vs traditional micro/
>> strip/line, and cost a lot of money. These days you can satisfy
>> yourself of this reality with a 3D field solver. Back when we tried
>> this, workstations were as slow as building it "for real", and more
>> expensive.
>> Just break out to a connector, use a coax assembly, and connect back
>> in. Easy peasy.
>>
>
>There is such a thing as microcoax, so he can chisel out a little groove
>in a thick pc and stuff that in there.
Semi-rigid is the term, and if it is in coax, it doesn't need to be IN the PCB from point to point.
I wish you guys would stop cross posting all over the place. Many ISPs have group inclusion limits.
It is also not considered proper Usenet practice.