A novel approach for studying and designing lowcost anisotropic transmitarrays at sub-THz frequencies is presented here. The array comprises three metal layers and two interleaved dielectric spacers. A four-port equivalent circuit model is derived to accurately model the anisotropic behavior of the unit-cell. The analysis proves theoretically that nearly perfect transmission and complete phase control can be achieved at the same time. A systematic procedure optimizing the admittance tensor of the inner layer is described for the unit-cell design. A 3-bit transmitarray antenna at 300 GHz is fabricated using a standard printed circuit board process. The measured results demonstrate that the design methodology is effective even under strict technological constraints. The antenna achieves a peak gain of 32.2 dBi with 36.5% aperture efficiency and 70.4 GHz of 3-dB bandwidth.
In this paper, we study the transmission behavior of a three-layer architecture comprising anisotropic FSS layers with applications to the optimal design of transmitarray (TA) antennas. We employ a theoretical analysis considering the depolarizing properties of the middle layer. We derive a condition showing that we can cover the full phase of transmission achieving at the same time zero insertion loss (IL). Lastly, a 3-bit 40×40 TA is realized at 300 GHz, based on the previous analysis. The antenna is able to attain a maximum gain of 35.1 dBi with an aperture efficiency of 64.8%, which is only 0.5 dB less than the ideal case of a TA with full transmission and perfect phase compensation.
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