GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
The significance of this research and development to the Air Force is that a new type of electromagnetic window panel was designed and tested that exhibited a bandwidth of 101 or greater. Empirical data are included on both flat panels and curved panels. A typical panel that operates from 4 GHz to 40 GHz, having 90 percent or better transmission coefficient from 0 to 60 deg angle of incidence range, is 1.5-inches in thickness. The inner and outer surfaces of the panel are either grooves or pyramids. This type panel design has excellent circular polarization characteristics, since the amplitudes of the parallel and perpendicular components are near equal and since the insertion phase delays for the two components are approximately the same. Antenna radiation pattern measurements are included that also verify the broadband characteristics of these panels. Data are also presented on a computer analysis program of transmission through an anisotropic media. The analytical results compare favorably with the measured data.