Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 20, Issue 6, Pages 1093-1097Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2021.3073144
Keywords
Airy beam; nondiffracting beam; orbital angular momentum (OAM); reflectarray
Funding
- National Natural Science Foundation of China (NSFC) [61971051]
- BUPT Excellent Ph.D. Students Foundation [CX2019225]
- State Key Laboratory of Millimeter Waves, Southeast University [K202010]
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In this study, a millimeter-wave nondiffracting Airy orbital angular momentum beam was experimentally demonstrated using a reflectarray, with theoretical analysis and experimental results showing good agreement and validating its autofocusing and self-healing properties.
In this letter, a millimeter-wave (mm-wave) nondiffracting Airy orbital angular momentum (OAM) beam is experimentally demonstrated by using a single-layer hexagonal lattice reflectarray based on an Airy-OAM-phase modulation method. To reduce the design time, a near-field synthesis technique is used to theoretically analyze the nondiffracting characteristics of the Airy OAM beam. A hexagonal dual-resonance element, composed of a hexagon ring around a square patch, is employed in the reflectarray to provide a linear phase range of 360 degrees. The proposed reflectarray with a diameter of 45 cm is designed at 47 GHz, which can reshape the incident wave according to the superposition phase of the desired Airy beam and OAM beam. To validate our design, a prototype is fabricated and measured. The measured results agree well with the theoretical and simulated ones. The experimental results show that an Airy OAM beam with the mode of +1 is successfully generated from 44 to 49 GHz. The nondiffracting propagation distance is greater than 2.5 m (392 lambda(0)). Moreover, the measured results validate the autofocusing and self-healing properties of the Airy OAM beam.
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