A technique for building conformal antennas flush into the surface of aircraft to improve aerodynamics with no loss of electromagnetic performance is in further development by HRL Laboratories. Called holographic impedance surfaces for antennas, they are made in much the same way as holograms. In an abstract summarizing HRL’s original work published by the Institute of Electrical and Electronics Engineers, the impedance surface was described as a lattice of sub-wavelength metal patches on a ...


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