volume | PIER Journals

Abstract

In this study, a single-layer substrate and via-free transmit-reflect-array antenna based on a metasurface is proposed. The array antenna comprises transmissive and reflective unit cells arranged alternately in sequence. To achieve a 360° phase coverage, two sets of antisymmetric U-shaped lines are etched on the top and bottom layers of the substrate to form the transmissive unit cells, and multi-layer stacking and vias are avoided. Moreover, by adjusting the lengths of a split-ring structure with phase delay lines for reflective unit cells, a 360° phase coverage is achieved. The measurement results demonstrate that the antenna simultaneously generates a reflective focused beam with a peak gain of 20.8 dBi and a transmissive +1-mode OAM vortex beam with a peak gain of 20 dBi and a mode purity of 90% at 17 GHz.

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Dr. Xinwei Chen

Dr. Xinmiao Zhao

Dr. Jinrong Su

Dr. Guorui Han

Dr. Runbo Ma

Dr. Li Li