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| Citation: | LIN Yifeng, SHAN Mingming, KONG Xudong, et al. Orbital angular momentum anti-interference properties analysis of electromagnetic vortex wave[J]. Journal of Radars, 2021, 10(5): 773–784. doi: 10.12000/JR21096
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Orbital Angular Momentum Anti-interference Properties Analysis of Electromagnetic Vortex Wave
doi: 10.12000/JR21096
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Abstract
The electromagnetic vortex wave has demonstrated excellent research value with potential applications in the fields of wireless communication and radar detection and imaging due to its unusual electromagnetic field distribution and theoretically infinite orthogonal Orbital Angular Momentum (OAM) modes. This study analyzes the anti-interference performance of OAM modes in the electromagnetic vortex Radio Frequency (RF) transceiver link primarily from the perspective of the electromagnetic vortex field distributions in space and the OAM modes orthogonality. Planar antenna arrays are designed to generate the electromagnetic vortex beams with respective OAM modes of and in the C band, and the corresponding RF transceiver links are established. The OAM modes’ anti-interference properties under different interference situations are analyzed in the electromagnetic vortex RF transceiver link by using a horn antenna as the interference source. Meanwhile, the corresponding OAM mode spectrum and the OAM modes’ orthogonality are employed as the primary methods in our analysis. Finally, the designed antenna models are fabricated, and the electromagnetic vortex RF transceiver links are measured. The corresponding analyses and conclusions are presented in this study. The OAM modes’ anti-interference performance analysis in the vortex electromagnetic wave’s RF transceiver link can provide a reference for exploring and designing a vortex electromagnetic wave in wireless communication and radar detection and imaging research. -
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References
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- Figure 1. Right-handed circularly polarized antenna unit structure diagram
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Figure 2. Designed antenna array for generating electromagnetic vortex beam with OAM mode
$\ell = + 1$ -
Figure 3. Designed antenna array for generating electromagnetic vortex beam with OAM mode
$\ell = - 2$ - Figure 4. Generated vortex beams’ 3D radiation pattern and 2D radiation pattern through the designed antenna array
- Figure 5. Simulated vortex electric field intensity distributions and phase distributions of OAM mode +1 and OAM mode –2 in the observation plane through the design antenna array
- Figure 6. Curves of the OAM mode purity versus the sampling reception radius, and the OAM mode purity spectrum at the fixed sampling reception radius of 300 mm
- Figure 7. Simulation model for electromagnetic vortex waves’ OAM mode ant-interference analysis
- Figure 8. Simulated vortex electric field distributions when the interference source is set at different deflection angles
- Figure 9.
- Figure 9. Curves of the OAM mode purity versus the sampling reception radius when the interference source is located at different illumination angles, and the OAM mode purity spectrum at the fixed sampling reception radius of 300 mm
- Figure 10. Reception antenna array model for different OAM modes
- Figure 11. Antenna array prototype and the corresponding measurement environment
- Figure 12. Measured transmission coefficients of different OAM modes