3D 'Probe' machine, in plastic, for RF work?

[gacrwell]

I have no idea which forum to put this post in - this one was the closest I could think of.

I'm considering building a system, that could 'scan' an RF probe around a stationary object, for taking near-field RF measurments. It would be a 3-axis system, not unlike a small 2.5D router table, perhaps 18"x18"x6" of scanning area.

Oh yeah, it's got to be constructed of non-metallic materials. I can't avoid the motors and wiring, though I might belt drive them to get them farther away. I'm OK with MDF and HDPE structural parts. What I don't know about are non-metallic drive and bearing components. Any ideas would be appreciated.

Gary

[all4anm]

I work with an antenna engineer. He says to just put all the metal behind the probe and use a directional probe so you don't see the metal.

Maybe with more info like frequecy range I could get you a better answer.

kl