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\text{\hspace{0.17em} mm}\times \text{280 \hspace{0.17em} mm} Teflon plate are designed to transform an incoming spherical wave at \text{650 \hspace{0.17em} GHz} into an output wave generating a \text{100 \hspace{0.17em} mm} diameter planar field region (quiet zone) at a distance of \text{1 \hspace{0.17em} 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.