Terminator3
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What foamed/pore hard plastic used in some horn / satellite/ etc. antennas?
Sometimes it is machined to form a Frensel lens, sometimes it is very thick, even thicker than a wavelength and allows to make durable horn with very thick metal around it. I want to know what is that material, it looks like there are many small pores in it, very lightweight, different in color, white, gray/yellow, black. I guess with good characteristics, without too much microwave absorption, etc.
Sometimes it is machined to form a Frensel lens, sometimes it is very thick, even thicker than a wavelength and allows to make durable horn with very thick metal around it. I want to know what is that material, it looks like there are many small pores in it, very lightweight, different in color, white, gray/yellow, black. I guess with good characteristics, without too much microwave absorption, etc.