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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Estimation of Antenna Correlation Coefficient of N-Port Lossy MIMO Array

  • Saputro, Susilo Ady (Department of Electrical and Information Engineering, Seoul National University of Science and Technology) ;
  • Nandiwardhana, Satya (Department of Electrical and Information Engineering, Seoul National University of Science and Technology) ;
  • Chung, Jae-Young (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
  • Received : 2017.08.21
  • Accepted : 2018.02.19
  • Published : 2018.06.01
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Abstract

This paper proposes a simple yet accurate method for estimating the antenna correlation coefficient (ACC) of a high-order multiple-input multiple-output (MIMO) antenna. The conventional method employed to obtain the ACC from three-dimensional radiation patterns is costly and difficult to measure. An alternate method is to use the S-parameters, which can be easily measured using a network analyzer. However, this method assumes that the antennas are highly efficient, and it is therefore not suitable for lossy MIMO antenna arrays. To overcome this limitation, we define and utilize the non-coupled radiation efficiency in the S-parameter-based ACC formula. The accuracy of the proposed method is verified by the simulation results of a 4-port highly coupled lossy MIMO array. Further, the proposed method can be applied to N-port arrays by expanding the calculation matrix.

Keywords

References

  1. J.-Y. Chung, T. Yang, and J. Lee, "Low Correlation MIMO Antenna with Negative Group Delay," Prog. Electromagn. Res. C, vol. 22, 2011, pp. 151-163. https://doi.org/10.2528/PIERC11051007
  2. R.G. Vaughan and J.B. Andersen, "Antenna Diversity in Mobile Communication," IEEE Trans. Veh. Technol., vol. 36, no. 4, Nov. 1987, pp. 149-172. https://doi.org/10.1109/T-VT.1987.24115
  3. S. Blanch, J. Romeu, and I. Corbella, "Exact Representation of Antenna System Diversity Performance from Input Parameter Description," IEEE Electron. Lett., vol. 39, no. 9, 2003, pp. 705-707. https://doi.org/10.1049/el:20030495
  4. Y.A.S. Dama, R.A. Abd-Alhameed, S.M.R. Jones, J.M. Noras, and N.T. Ali, "An Exact Envelope Correlation Formula for Two-Antenna Systems Using Input Scattering Parameters and Including Power Losses," Int. J. Commun. Antenna Propag., vol. 2, no. 1, Feb. 2012, pp. 41-46.
  5. P. Hallbjorner, "The Significance of Radiation Efficiencies When Using S-parameters to Calculate the Received Signal Correlation from Two Aantennas," IEEE Antennas Wireless Propag. Lett., vol. 4, 2005, pp. 97-99. https://doi.org/10.1109/LAWP.2005.845913
  6. H. Li, X. Lin, B.K. Lau, and S. He, "Equivalent Circuit Based Calculation of Signal Correlation in Lossy MIMO Antennas," IEEE Trans. Antennas Propag., vol. 61, no. 10, Oct. 2013, pp. 5214-5222. https://doi.org/10.1109/TAP.2013.2273212
  7. H. Li, X. Lin, B.K. Lau, and S. He, "Calculating Signal Correlation in Lossy Dipole Arrays Using Scattering Parameters and Efficiencies," in Proc. Eur. Conf. Antennas Propag. (EuCAP'2013), Gothenburg, Sweden, Apr. 8-12, 2013, pp. 519-523.
  8. S.A. Saputro and J.Y. Chung, "An Improved Method for Estimating Antenna Correlation Coefficient of Lossy MIMO Arrays," in Proc. URSI Asia-Pacific-Radio Sci. Conf., Seoul, Rep. of Korea, Aug. 21-25, 2016, pp. 177-180.
  9. J. Thaysen and K.B. Jakobsen, "Envelope Correlation in (N, N) Mimo Antenna Array from Scattering Parameters," Microw. Opt. Tech. Lett., vol. 48, no. 5, 2006, pp. 832-834. https://doi.org/10.1002/mop.21490
  10. B.I. Neelgar and G.S.N. Raju, "Impedance Characteristics of Yagi-Uda Antenna," Int. J. Electron. Commun. Eng., vol. 4, no. 1, 2011, pp. 115-130.
  11. J. Won, S. Jeon, and S. Nam, "Identifying the Appropriate Position on the Ground Plane for MIMO Antennas Using Characteristic Mode Analysis," J. Electromag. Eng. Sci., vol. 16, no. 2, Apr. 2016, pp. 119-125. https://doi.org/10.5515/JKIEES.2016.16.2.119
  12. D. Kwon, S.-J. Lee, J.-W. Kim, B. Ahn, J.-W. Yu, and W.-S. Lee, "8-Element Compact Low Profile Planar MIMO Antenna Using LC Resonance with High Isolation," J. Electromag. Eng. Sci., vol. 16, no. 3, 2016, pp. 194-196. https://doi.org/10.5515/JKIEES.2016.16.3.194