Researchers fashioned a
prism out of this meta material that made microwaves bend backwards.
The key to the material is the group of tiny copper lines on one side
of the circuit boards' sections, and the circular shapes on the otherside.
University of California at
bends microwaves backwards
TRN April 11, 2001
Materials Science and Engineering;
Optical Computing, Optoelectronics and Photonics