Walter Rotman

He served in the United States Air Force during World War II as a technician for the radar division.

These periodic structures, which he analyzed together with Arthur Oliner, allow antennas to scan in various directions by changing frequencies.

[2][3] Building upon previous work,[4] Rotman used a grid of three-dimensional thin wires to simulate plasmas with dielectric constants of less than one.

[5][6] However, Rotman did not attempt to use these grids to simulate negative epsilon material, possibly because he saw the difficulties with dispersion and loss which would occur.

He received the IEEE Centennial Medal in 1984 and the USAF Decoration for Exceptional Civilian Service in 1980, and the John Kraus Antenna Award in 2005.