Abstract—Transmitarray unit-cells, typically multi-layered, have several design challenges. These structures require many thick substrates between layers. This makes the transmitarray costly and bulky. Besides, significant modifications of the size of radiating layers to achieve phase variation may lead to discrepancies between unit-cell performance in periodic boundary simulation and that in the real transmitarray. This paper proposes a 2-bit transmitarray unit-cell structure made from two substrates and a combination of C-patches and C-slots. Thanks to the multi-resonance characteristics of the C-patches and C-slots, a large phase shift can be primarily realized through varying the slot length of the C-slots on the middle layers. As a result, the radiating elements in the array are the same size. A lowcost, thin transmitarray prototype is fabricated and measured. Experimental results reveal a 1-dB bandwidth of 7%. A peak aperture efficiency is achieved of 43% at 11.8 GHz. Furthermore, the side lobe level is less than 18 dB, and cross-polarization radiation is below 30 dB.

Keywords—cut-ring patch, cut-ring slot, reflectarray, transmitarray, unit-cell design



Cite: Minh Thien Nguyen, Linh Mai, and Binh Duong Nguyen, “Transmitarray Antenna Based on Low-Profile Multi-resonance C-patch and C-slot Elements," Journal of Communications, vol. 19, no. 5, pp. 248-254, 2024.




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