Mutual Coupling Reduction Using Ground Stub and EBG in a Compact Wideband MIMO-Antenna

This paper presents a compact, uni-planer wide band Multiple-Input-Multiple-Output (MIMO) antenna. The designed antenna array has a compact size of (26mm x 31mm) covering a wide frequency band from 3.1GHz - 11GHz. A partial ground plane shared by two radiating patches is used. A ground stub and a single column Electromagnetic Bandgap (EBG) structure in between the two radiating patches results in very low mutual coupling in the designed antenna. The proposed MIMO-antenna was evaluated through different performance metric indicators like channel capacity loss, far-field radiation pattern, S-parameters, envelope correlation coefficient, peak gain, diversity-gain and radiation efficiency. Our designed MIMO antenna has a very high isolation amongst the MIMO antennas ( $\text{S}_{21} < -25$ dB), a high Diversity-Gain (DG $>9.995$ dB), a very low Envelope Co-relation Coefficient of (ECC < 0.001) and low Channel-Capacity-Loss (CCL < 0.1bits/s/Hz). The said antenna has an average radiation efficiency of 85.5% and a peak gain of (5.67dB) within the ultra-wideband (UWB) spectrum. A 0.8mm thick FR-4 substrate is used to fabricate the MIMO-antenna and tested in an anechoic chamber. The measured results closely match with the simulated results.

[1]  S. M. Shakil Hassan,et al.  Identical performance from distinct conventional electromagnetic bandgap structures , 2016 .

[2]  Dong-You Choi,et al.  Study on Mutual Coupling Reduction Technique for MIMO Antennas , 2019, IEEE Access.

[3]  Harsh Verdhan Singh,et al.  Compact UWB MIMO antenna with cross‐shaped unconnected ground stub using characteristic mode analysis , 2019, Microwave and Optical Technology Letters.

[4]  S. P. Singh,et al.  Shared radiator MIMO antenna for broadband applications , 2018 .

[5]  Xiaosong Zhu,et al.  Compact UWB MIMO Vivaldi Antenna With Dual Band-Notched Characteristics , 2019, IEEE Access.

[6]  Hongjoon Kim,et al.  Development of 60-GHz millimeter wave, electromagnetic bandgap ground planes for multiple-input multiple-output antenna applications , 2020, Scientific Reports.

[7]  Xiao Dong Chen,et al.  Multiperiod EBG structure for wide stopband circuits , 2003 .

[8]  Tayeb A. Denidni,et al.  Millimeter-Wave Compact EBG Structure for Mutual Coupling Reduction Applications , 2015, IEEE Transactions on Antennas and Propagation.

[9]  K. S. Sultan,et al.  PLANAR UWB MIMO-DIVERSITY ANTENNA WITH DUAL NOTCH CHARACTERISTICS , 2019, Progress In Electromagnetics Research C.

[10]  S. Rajkumar,et al.  Isolation improvement of UWB MIMO antenna utilising molecule fractal structure , 2019, Electronics Letters.

[11]  Xiaofeng Wu,et al.  Compact UWB-MIMO Antenna With High Isolation and Triple Band-Notched Characteristics , 2019, IEEE Access.

[12]  Rashid Saleem,et al.  A Compact Quad-Element UWB-MIMO Antenna System with Parasitic Decoupling Mechanism , 2019, Applied Sciences.

[13]  Slawomir Koziel,et al.  Ground Plane Alterations for Design of High-Isolation Compact Wideband MIMO Antenna , 2018, IEEE Access.

[14]  Amjad Iqbal,et al.  Mutual Coupling Reduction Using F-Shaped Stubs in UWB-MIMO Antenna , 2018, IEEE Access.

[15]  Mau-Phon Houng,et al.  A novel cross-shape DGS applied to design ultra-wide stopband low-pass filters , 2006, IEEE Microwave and Wireless Components Letters.

[16]  Muhammad Saeed Khan,et al.  Isolation enhancement of a wideband MIMO antenna using floating parasitic elements , 2015 .

[17]  Mohammad Amin Honarvar,et al.  Design of High-Isolation Compact MIMO Antenna for UWB Application , 2016 .

[18]  Junfa Mao,et al.  Miniaturized Tapered EBG Structure With Wide Stopband and Flat Passband , 2012, IEEE Antennas and Wireless Propagation Letters.

[19]  Mei Li,et al.  Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays , 2017, IEEE Transactions on Antennas and Propagation.

[20]  Q. Wang,et al.  Wide stopband miniaturized “I”‐typed EBG with DGS , 2018 .

[21]  N. Amar Touhami,et al.  Mutual Coupling Reduction Using a Protruded Ground Branch Structure in a Compact UWB Owl-Shaped MIMO Antenna , 2018, International Journal of Antennas and Propagation.

[22]  Xianliang Wu,et al.  A Compact Tapered EBG Structure With Sharp Selectivity and Wide Stopband by Using CSRR , 2018, IEEE Microwave and Wireless Components Letters.

[23]  Ying Liu,et al.  Isolation Enhancement in Patch Antenna Array With Fractal UC-EBG Structure and Cross Slot , 2017, IEEE Antennas and Wireless Propagation Letters.

[24]  Jung-Dong Park,et al.  Isolation Enhancement of Wide-Band MIMO Array Antennas Utilizing Resistive Loading , 2019, IEEE Access.

[25]  Yogendra Kumar Awasthi,et al.  High Diversity Gain MIMO-Antenna for UWB Application with WLAN Notch Band Characteristic Including Human Interface Devices , 2020, Wirel. Pers. Commun..

[26]  K. S. Vishvaksenan,et al.  Mutual Coupling Reduction in Microstrip Patch Antenna Arrays Using Parallel Coupled-Line Resonators , 2017, IEEE Antennas and Wireless Propagation Letters.

[27]  Bahare Mohamadzade,et al.  Mutual coupling reduction and gain enhancement in patch array antenna using a planar compact electromagnetic bandgap structure , 2017 .