Design and Analysis of mm-Wave MIMO Antenna With a UWB AMC

This article presents the design and analysis of an ultrawideband (UWB) Artificial Magnetic Conductor (AMC) aimed to enhance the gain of a UWB mm-wave MIMO antenna. The AMC features capacitive slots to excite TM20 mode to achieve a phase bandwidth of 14.08 GHz, ranging from 23.49 GHz to 37.57 GHz. A 10×10 AMC array is positioned 0.38<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</i> (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</i> is free space wavelength at 23.27) beneath the MIMO antenna for the gain enhancement. The proposed antenna resonates from 23.27 GHz to 39.3 GHz with an impedance bandwidth of 16.03 GHz. The isolation between quad ports is greater than 19.84 dB. The enhanced gain of the proposed MIMO antenna ranges from 8.7 dBi to 12.21 dBi, with maximum gain reaching 12.21 dBi at 31.5 GHz. The proposed antenna shows diverse performance in terms of Envelope correlation coefficient (ECC)< 0.005, Channel capacity loss (CCL)< 0.26 b/s/Hz and Total active reflection coefficient (TARC)< -10 dB. The size of the proposed antenna is 3.8<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</i>×3.8<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</i>×0.38<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</i> only. This makes the proposed antenna suitable for a 5G bastion antenna.