Eight‐element‐based MIMO antenna with CP behaviour for modern wireless communication

Abstract

In this work, an eight‐element multiple‐input multiple‐output (MIMO) antenna with circular polarisation (CP) ability is proposed. The proposed antenna consists of eight off‐centred fed modified rectangular open‐loop resonating radiators. CP behaviour is realised by utilising a narrow slit on the loop and a modified ground plane. Measurement reveals that the proposed CP‐MIMO antenna occupies an overlapping 10 dB return loss bandwidth and a 3 dB axial ratio bandwidth over the frequency span of 5–6 GHz with inter‐element isolation > 8 dB. Essential diversity and multiplexing performances are estimated intuitively by means of the envelope correlation coefficient and ergodic channel capacity, which lie within their adequate range. To ensure its applicability in user terminal devices and confirm the use of other electronic circuitry, the antenna performances are also investigated in the presence of a conducting sheet which is commonly grounded with the antenna ground plane.

Sub-6 GHz Metallic via Integrated MIMO Antenna Array for 5G Smartphone

“…Several studies have been conducted in the field of antenna design to address these requirements. There exist several approaches that can help increase isolation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. A neutralization line presented in [1][2][3], a common ground plane technique reported in [4,5], and a gap-coupled feeding arrangement adopted in [6,7] are the methods employed to mitigate the mutual coupling.…”

“…The article [12] has described a hybrid loop/openslot antenna to excite additional modes for an LTE smartphone application. The eight off-centred fed modified rectangular open-loop resonating radiators with circular polarization (CP) behaviour have been realised by utilising a narrow slit on the loop and a modified ground plane [13]. A high-isolation printed eight-element array operating at 3.45 GHz (3.3-3.6 GHz) has been investigated in [14].…”