>Another great material is Rexolite (crosslinked
>Polystyrene). It make wonderful waveguide windows. Also it makes nice
>insulators in cavities. But is is very brittle, and tough to machine. The
>dielectric properties are not far from PTFE, lightly higher K, and loss is
>maybe 10x, still negligable even to X band.
Rexolite is also outstanding for making circuits with. You can literally
cut a grove with just a box knife in copper clad boards and the peel off
the copper you don't want leaving you a nice microstrip. Used to make
antennas all the time with this stuff in the EM Lab at Illinois.
73,
Jon
KE9NA
--------------------------------------------------------------------------
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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