Decoupling and MIMO performance of two planar monopole antennas with protruded strips

Abstract

This paper proposes a simple yet elegant approach to reduce mutual coupling between two closely spaced planar monopole antennas with an inter‐element spacing of 2 mm operating in the 2.45 GHz ISM band by employing two thin metallic strips attached to the adjacent corners of the antenna elements and extending above the partial ground plane. Experimental results revealed a 19.6% measured bandwidth over which the transmission coefficient, S21 ≤ −20 dB, and the reflection coefficient, S11 ≤ −10 dB, extending from 2.25 GHz to 2.74 GHz with a realized gain of 2.86 dB at 2.45 GHz. The proposed array offers excellent MIMO performance in terms of envelope correlation coefficient and link efficiency in realistic MIMO propagation environments.

The Coefficient of Variation as a Performance Metric of Mimo Antenna Systems Under Arbitrary Handset Orientations

“…The design of antenna arrays for a handset has a significant impact on the MIMO performance of a mobile device [1][2][3][4][5][6]. Designing efficient MIMO antennas for mobile terminals is very challenging due to the influence of user orientation [1,[7][8][9][10][11][12].…”

“…The orientation of a handset antenna has a substantial impact on the interaction of the 3-D radiation patterns with the wireless channel in MIMO systems. The handset performance affects the overall network performance; it also affects the total capacity in the network since end-users with non-optimal handsets operate at lower modulation and coding scheme [1][2][3][4][5][6][7][8][9][10][11][12]. Therefore, industry seeks accurate methods to assess and evaluate the effects of orientation of the handset on the performance in MIMO systems [7].…”