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| Citation: | ZHOU Jingyi, ZHENG Shilie, YU Xianbin, et al. Reconfigurable mode vortex beam generation based on transmissive metasurfaces in the terahertz band[J]. Journal of Radars, 2022, 11(4): 728–735. doi: 10.12000/JR22021
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Reconfigurable Mode Vortex Beam Generation Based on Transmissive Metasurfaces in the Terahertz Band
doi: 10.12000/JR22021
More Information-
Abstract
Combining Terahertz (THz) and Orbital Angular Momentum (OAM) technologies has great potential in high-speed wireless communication. Theoretically, OAM with different modes has strict orthogonality. The communication capacity of the system will improve significantly if OAM technology is applied to the THz communication system. Thus, the manner to generate a high-quality and dynamically controllable THz-OAM beam has been of significant interest to researchers in related fields. In this study, a double-layer transmissive metasurface that uses 3D printing as the processing method with a low cost and processing difficulty is designed. Note that the height of the unit cell for constructing the metasurface is configurable. As the height changes continuously, the phase of the transmitted wave covers 0～2${\pi }$ within 90~110 GHz, while the transmittance of the units is always higher than 88%. At 100 GHz, which is fed by a WR-10 standard waveguide horn antenna, OAM beams with different modes are generated by changing the relative rotation angle between the double-layer metasurface. The simulation results show that the metasurface antenna designed in this study can achieve OAM beams of$ l=1, \mathrm{2,3} $ , and the two-dimensional amplitude and phase results correspond with the characteristics of the corresponding modes. When$ l=1,\mathrm{ }2,\mathrm{ }3 $ , the OAM beam’s modal purity is 85.4%, 84.9%, and 83.4%, respectively. The measurement results include the results at frequency points of 90, 100, and 110 GHz. The results show that the OAM beam has a high-quality bandwidth of 20 GHz, which indicates that the metasurface antenna designed in this study has a wide working bandwidth at a high frequency and can be applied to high-frequency OAM communication.-
Keywords:
- Terahertz,
- Vortex beam,
- Reconfigurable mode,
- Metasurface,
- Transmissive
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References
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- Figure 1. The unit structure
- Figure 2. Simulation results of transmissivity and transmission phase of the unit structure
- Figure 3. The setup of the feed and the double-layer metasurface
- Figure 4. Integration of the compensation board and the horn antenna
- Figure 5. Phase distributions of double-layer metasurface
- Figure 6. CST simulation the simulation model in CST
- Figure 7. The simulated amplitude and phase distribution of the double-layer metasurface antenna at different OAM mode
- Figure 8. The OAM purity analysis based on the simulated field distribution
- Figure 9. Photograph of the double-layer metasurface
- Figure 10. Experimental setup for the field scanning of the double-layer metasurface antenna
- Figure 11. The measured amplitude and phase distribution of the double-layer metasurface antenna at different OAM mode
- Figure 12.
- Figure 12. The OAM purity analysis based on the measured field distribution at 90, 100 and 110 GHz