Compact 4x4 CPW-fed MIMO antenna with Wi-Fi and WLAN notch for UWB applications




UWB, ECC, DG, TARC, CCL, MIMO, multiple-input multiple-output, UWB antenna, ultra-wideband antenna


This paper presents a compact CPW-fed MIMO antenna for UWB applications. The four-element CPW-fed antenna is designed as a radiator. The isolations between the same polarized elements and the orthogonally polarized elements are more than 20 and 25 dB, respectively. The floating parasitic element is used to improve isolation at a higher frequency. The simulated and measured 10 dB impedance bandwidth of the proposed MIMO UWB antenna is from 3.6 to 10.3 GHz. The return loss, isolation, radiation patterns, envelope correlation coefficient (ECC), total active reflection coefficient (TARC), diversity gain (DG), and channel capacity loss (CCL) are simulated and/or measured for the proposed antenna. ECCs are less than 0.0022, DGs are above 9.9 dB, TARC has minimum variations in different angles and CCLs are less than 0.4 bits/s/Hz at 10 dB impedance bandwidth. Due to which the proposed antenna can be used in portable UWB applications.


H. Babashah, H. R. Hassani, S. Mohammad-Ali-Nezhad, “A compact UWB printed monopole MIMO antenna with mutual coupling reduction,” Prog. Electromagn. Res. C, vol. 91, pp. 55–67, 2019, doi:

S. P. Biswal, S. Das, “A planar triple band four element antenna system with polarization and pattern diversity for LTE/WLAN/DSRC applications,” Int. J. RF Microw. Comput. Eng., vol. 28, no. 4, p. e21213, 2018, doi:

W. A. E. Ali, A. A. Ibrahim, “A compact double-sided MIMO antenna with an improved isolation for UWB applications,” AEU - Int. J. Electron. Commun., vol. 82, pp. 7–13, 2017, doi:

N. K. Kiem, H. N. B. Phuong, D. N. Chien, “Design of compact 4×4 UWB-MIMO antenna with WLAN band rejection,” Int. J. Antennas Propag., vol. 2014, pp. 1–11, 2014, doi:

J. Zhu, S. Li, B. Feng, L. Deng, S. Yin, “Compact dual-polarized UWB quasi-self-complementary MIMO/diversity antenna with band-rejection capability,” IEEE Antennas Wirel. Propag. Lett., vol. 15, pp. 905–908, 2016, doi:

X.-L. Liu, Z.-D. Wang, Y.-Z. Yin, J. Ren, J.-J. Wu, “A compact ultrawideband MIMO antenna using QSCA for high isolation,” IEEE Antennas Wirel. Propag. Lett., vol. 13, pp. 1497–1500, 2014, doi:

S. Tripathi, A. Mohan, S. Yadav, “A compact Koch fractal UWB MIMO antenna with WLAN band-rejection,” IEEE Antennas Wirel. Propag. Lett., vol. 14, pp. 1565–1568, 2015, doi:

R. Mathur, S. Dwari, “Compact 4-port UWB-MIMO slot antenna with dual polarization and low correlation for spatial diversity application,” Frequenz, vol. 72, no. 11–12, pp. 503–509, 2018, doi:

D. Sipal, M. P. Abegaonkar, S. K. Koul, “Compact planar 2×2 and 4×4 UWB mimo antenna arrays for portable wireless devices,” Microw. Opt. Technol. Lett., vol. 60, no. 1, pp. 86–92, 2018, doi:

S. Rajkumar, K. T. Selvan, P. H. Rao, “Compact 4 element Sierpinski Knopp fractal UWB MIMO antenna with dual band notch,” Microw. Opt. Technol. Lett., vol. 60, no. 4, pp. 1023–1030, 2018, doi:

B. Premalatha, M. V. S. Prasad, M. B. R. Murthy, “Multi-band notched antennas for UWB applications,” Radioelectron. Commun. Syst., vol. 62, no. 12, pp. 609–618, 2019, doi:

S. Blanch, J. Romeu, I. Corbella, “Exact representation of antenna system diversity performance from input parameter description,” Electron. Lett., vol. 39, no. 9, p. 705, 2003, doi:

C. Saha, J. Y. Siddiqui, Y. M. M. Antar, Multifunctional Ultrawideband Antennas. CRC Press, 2019, doi:

P. Hallbjorner, “The significance of radiation efficiencies when using S-parameters to calculate the received signal correlation from two antennas,” IEEE Antennas Wirel. Propag. Lett., vol. 4, pp. 97–99, 2005, doi:

S. H. Chae, S. Oh, S.-O. Park, “Analysis of mutual coupling, correlations, and TARC in WiBro MIMO array antenna,” IEEE Antennas Wirel. Propag. Lett., vol. 6, pp. 122–125, 2007, doi:

I. Elfergani et al., “Low-profile and closely spaced four-element MIMO antenna for wireless body area networks,” Electronics, vol. 9, no. 2, p. 258, 2020, doi:

Top view of proposed 4x4 MIMO antenna





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