Which element or substance reflects RF signals?
Answer:
I dont know why a sphere is in the picture for you. A corner reflector will reflect much, much more energy . Any metal will work: copper, aluminum foil, etc. Thickness is not important.
A corner reflector is basically what is used in light reflectors (like on a car). There are hundreds of sections of a cube molded into the plastic.
For RF, you may want the dimension of the cube to be on the order of 1/4 to 1 wavelength, if possible.
Everythings with high density would reflect RF signal.
Nearly any metal will reflect RF signals. You need a smooth surface to reflect signals that can be easily read.
In general, any conductor will reflect radio waves. The radio waves impinging on the conductor surface induces currents that re-radiate the signal.
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