Design of two-dimensional radio-frequency holograms using distributed apertures

We present an approach to design the transmission values for a closed distributed array of millimeter-wave antennas that generate a desired response within the interior of the array. The desired response consists of isolated peaks and nulls of energy. In comparison to previous work, we use vortex fields to generate wide-area, stable, isolated nulls. Our design approach considers the geometry of the transmitter array, the distribution of receivers, and the ability of the array to produce both converging spherical waves and optical vortices that yield isolated peaks and nulls. Our simulated results indicate the viability of this approach.