Transmitarray Using Perforated Dielectric Material for Wideband Applications

In this paper, linearly polarized transmitarray is investi- gated as to avoid the usage of multi-layers for improving the bandwidth of transmitarray. The transmitarray is formed from a single dielectric sheet by perforating selected areas of the material. A perforated dielec- tric layer is divided into square cell elements. Each cell has four holes with the same diameters. Holes with difierent diameters in the cell el- ements are used to allow continuous tuning of the transmitted signal's phase over 360 - range with a maximum loss of 3.6dB at 10GHz. The transmission coe-cient versus the diameter of the holes is calculated by using the flnite integration technique. The results are compared with those calculated with transmission line method for veriflcation. The focal-to-diameter ratio of the transmitarray is optimized for lower side lobe level and highest transmitarray gain. A comparison between the transmitarray and the re∞ectarray with the same aperture area is illustrated.