On 12/1/20 11:03 AM, Hal Murray wrote:
[email protected] said:
Yes, there’s more to it if you want to get connections in and out. Forget
about “hermetic� connectors, they aren’t up to the task. You need glass
to
metal seals embedded in the structure. Now you have even more constraints on
the package.
What's available in the way of glass-metal seals for coax? (The antenna
signal has to get in somehow.)
Vacuum tight hermetic feedthroughs - we use them all the time in thermal
vacuum testing to get the wires through the wall of the chamber.
They come in two kinds - O-ring sealed and "braze in"
On a smaller scale, there are plenty of hermetic RF (and non RF)
connectors used on sealed assemblies that get leak tested. Usually, it's
a "braze in" sort of thing where you have a hole that's "slightly"
larger, and you drop the thing in.
It's a "well understood and mature" technology, if a bit expensive.
Sub-D, multipin round, thermocouple wires, fiber optics, etc. they're
all available.
I've used modified spark plugs as a HV hermetic feedthrough.
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