Abstract

A design formalism is presented for transmission-type phase holograms for use in a submillimeter-wave compact radar-cross-section (RCS) measurement range. The design method is based on rigorous electromagnetic grating theory combined with conventional hologram synthesis. Hologram structures consisting of a curved groove pattern on a 320  mm×280   mm Teflon plate are designed to transform an incoming spherical wave at 650   GHz into an output wave generating a 100   mm diameter planar field region (quiet zone) at a distance of 1   m. The reconstructed quiet-zone field is evaluated by a numerical simulation method. The uniformity of the quiet-zone field is further improved by reoptimizing the goal field. Measurement results are given for a test hologram fabricated on Teflon.

© 2007 Optical Society of America

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