volume | PIER Journals

Abstract

We report a reduction in crosstalk between a transmitting antenna and an adjacent receiving antenna due to the use of radiation patterns with different orbital angular momentum (OAM). This crosstalk reduction is based on the orthogonality between different OAM modes. To generate OAM beams, patch array antennas are designed using High frequency simulation software (HFSS). The designed antennas are fabricated and characterized. An experiment is carried out to determine the amount of crosstalk reduction achieved due to the OAM nature of the signals transmitted. The variation of this crosstalk reduction with the distance between the transmitting and receiving antennas is also studied. The results obtained are verified through theoretical analysis using simulations in HFSS. A maximum theoretical crosstalk reduction of 3.6 dB has been obtained, and a crosstalk reduction of 2.6 dB has been realized experimentally. The results may benefit full-duplex communication links.

1. Allen, L., M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A, Vol. 45, No. 11, 8185-8189, Jun. 1992. Accessed on: Sep. 7, 2020.
doi:10.1103/PhysRevA.45.8185 Google Scholar

2. Yao, A. M. and M. J. Padgett, "Orbital angular momentum: Origins, behavior and applications," Adv. Opt. Photonics, Vol. 3, No. 2, 161-204, May 2011. Accessed on: Sep. 7, 2020.
doi:10.1364/AOP.3.000161 Google Scholar

3. Tamburini, F., E. Mari, A. Sponselli, B. Thide, A. Bianchini, and F. Romanato, "Encoding many channels on the same frequency through radio vorticity: First experimental test," New J. Phys., Vol. 14, No. 3, 3001-3018, Mar. 2012. Accessed on: Sep. 11, 2012.
doi:10.1088/1367-2630/14/3/033001 Google Scholar

4. Tamburini, F., E. Mari, G. Parisi, F. Spinello, M. Oldoni, R. A. Ravanelli, P. Coassini, C. G. Someda, B. Thide, and F. Romana, "Tripling the capacity of a point-to-point radio link by using electromagnetic vortices," Radio Sci., Vol. 50, No. 6, 501-508, Jun. 2015. Accessed on: Sep. 7, 2020.
doi:10.1002/2015RS005662 Google Scholar

5. Spinello, F., E. Mari, M. Oldoni, R. A. Ravanelli, C. G. Someda, F. Tamburini, F. Romanato, P. Coassini, and G. Parisi, "Experimental near field OAM-based communication with circular patch array," Optics, 1507.06889, Jul. 2015. Google Scholar

6. Ashrafi, S., "Full duplex using OAM,", Patent 20200044349, [Online]. Available: Justia: Patents: US Patent Application for FULL DUPLEX USING OAM Patent Application. Google Scholar

7. Zhang, Y. and J. Li, "Analyses and full-duplex applications of circularly polarized OAM arrays using sequentially rotated configuration," IEEE Transactions on Antennas and Propagation , Vol. 66, No. 12, 7010-7020, Dec. 2018.
doi:10.1109/TAP.2018.2872169 Google Scholar

8. Choi, J. I., M. Jain, K. Srinivasan, P. Levis, and S. Katti, "Achieving single channel, full duplex wireless communication," International Conference on Mobile Computing and Networking, 2010,Online], available: https://web.stanford.edu/∼skatti/pubs/mobicom10-fd.pdf.. Google Scholar

9. Chen, S., M. Beach, and J. McGeehan, "Division-free duplex for wireless applications," IEEE Electron. Lett., Vol. 34, No. 2, 147-148, Jan. 1998. Accessed on: Sept. 6, 2020.
doi:10.1049/el:19980022 Google Scholar

10. Duarte, M., "Full-duplex wireless: Design, implementation and characterization,", PhD. Dissertation, Rice Univ., Houston, Tx, 2012. Google Scholar

11. Duarte, M., A. Sabharwal, V. Aggarwal, R. Janna, K. K. Ramakrishnan, C. W. Rice, and N. Shankaranarayanan, "Design and characterization of a full-duplex multiantenna system for WiFi networks," IEEE Trans. Veh. Technol., Vol. 63, No. 3, 1160-1177, Mar. 2012. Accessed on: Sep. 7, 2020.
doi:10.1109/TVT.2013.2284712 Google Scholar

12. Jain, M., J. I. Choi, T. Kim, D. Bharadia, S. Seth, K. Srinivasan, P. Levis, S. Katti, and P. Sinha, "Practical, real-time, full duplex wireless," MobiCom, Las Vegas, Nevada, USA, Sep. 19–23, 2011. Google Scholar

13. Sahai, A., G. Patel, C. Dick, and A. Sabharwal, "On the impact of phase noise on active cancellation in wireless full-duplex," IEEE Trans. Veh. Technol., Vol. 62, No. 9, 4494-4510, Nov. 2013. Accessed on: Sep. 7, 2020.
doi:10.1109/TVT.2013.2266359 Google Scholar

14. Trinder, J. R., "Parabolic reflector,", Patent WO 2005069443, Jul. 28, 2005. Google Scholar

15. Schemmel, P., G. Pisano, and B. Maffei, "Modular spiral phase plate design for orbital angular momentum generation at millimetre wavelengths," Opt. Express, Vol. 22, No. 12, 14712-14726, Jun. 2014. Accessed on: Sep. 8, 2020.
doi:10.1364/OE.22.014712 Google Scholar

16. Gao, X., S. Huang, J. Zhou, Y. Wei, C. Gao, X. Zhang, and W. Gu, "Generating, multiplexing/demultiplexing and receiving the orbital angular momentum of radio frequency signals using an optical true time delay unit," J. Opt., Vol. 15, No. 10, 5401-5407, Aug. 2013. Accessed on: Sep. 8, 2020. Google Scholar

17. Mahmouli, F. E. and S. Walker, "Orbital angular momentum generation in a 60 GHz wireless radio channel,", 20th TELFOR, Nov. 2012, [Online]. Available: https://ieeexplore.ieee.org/document/6419210. Google Scholar

18. Bai, Q., A. Tennant, and B. Allen, "Experimental circular phased array for generating OAM radio beams," Electron. Lett. , Vol. 50, No. 20, 1414-1415, Sep. 2014. Accessed on: Sep. 8, 2020.
doi:10.1049/el.2014.2860 Google Scholar

Ms. Unaiza Tariq

Dr. Hiva Shahoei

Dr. Guang Yang

Dr. Duncan L. MacFarlane