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IWR1443BOOST: Use radar-absorbing tube to block beam from metal walls?

Part Number: IWR1443BOOST

IWR1443BOOST

I wish to measure the level of granular material in a 3m diameter x 9m tall steel tank.
I believe the radar reflections (harmonics) from the metals walls will be a big problem, correct?

There appears to be no available optical lens for the IWR1443BOOST, and no information on making one, cheap that is.

Could I make a tube of a radar-absorbing material and shoot the beam through it, thereby blocking the beam from striking the wall?
My initial calculations are that a 2.5" diameter tube, 6 inches long would block/shield the walls.

What material might work?
I'm reading that Silicon Carbide and Ferrite powder are a good absorbers.
I could adhere some Silicon Carbide/Iron powder to a Lexan tube, or make a sleeve filled with powder.
Any suggestions on the optimal powder (micron) size and total layer thickness?

Do you have a list of the "mm radar" dielectric properties of various materials?