Experimental Study of the Back Scattering from Conducting Objects in the Range of One Quarter to One Wavelength in Size

摘要

The primary purpose of this study was to reduce the magnitude of the back scattering from objects by introducing reactive or other loading. Analytic solutions for values of loading have previously been obtained for certain simple objects. However, the complexity of an analytic approach for larger and more complicated objects led to the experimental approach of this study. A system was developed to measure the relative phase and magnitude of the backscattered fields. This phase and magnitude information was extremely valuable in the reduction of back scattering by means of reactive loading. A number of objects were detuned by means of reactive loading. The detuned objects included regular polyhedrons, dipole and monopole elements, cylinders, and planar structures. The objects' backscattering cross sections were reduced 15-db to 20-db or more at the frequency of minimum back scattering. Some bandwidths obtained were in order of 15-percent to 30percent for reductions of 15-db in cross section. (Author)