[time-nuts] Thinking outside the box a super reference
attila at kinali.ch
Sat Nov 5 10:36:37 EDT 2016
On Sat, 5 Nov 2016 06:53:45 -0700
jimlux <jimlux at earthlink.net> wrote:
> On 11/5/16 2:59 AM, Attila Kinali wrote:
> But we still need to ensure that the field is properly
> > oriented and homogenous over the whole vapor cell. For this you need
> > a cavity that is properly designed and most likely will be resonant at 6.9GHz.
> > (I don't know whether it is possible to design a non-resonant cavity with
> > the above properties)
> isn't a TEM cell, as used in EMI/EMC testing, something like this? It's
> a tapered transmission line and produces a uniform field within an area
> inside the line.
Yes, they fullfill the "constant field" condition, but not the "properly
oriented" condition. The field in these cells has still a quite considerable
curl. One can of course minimize that by building a larger one, but
then there are smaller structures with similar properties, when one does
not need the the wideband property of those TEM cells.
Any simple idea will be worded in the most complicated way.
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