Ultra-wideband Quad Element MIMO Antenna on a Flexible Substrate for 5G and Wearable Applications

Abstract

This study describes the development of a low-profile, omnidirectional, CPW-fed Ultra-Wide Band (UWB) MIMO antenna. The antenna is designed on a flexible FR4 substrate with thickness 0.07 mm, making it suitable for wearable applications. The fractional bandwidth obtained is more than 100% (3.1-9.3 GHz) which spans the wireless communication bands such as ISM (5.15-5.35 GHz), ISM (5.725-5.825 GHz), Wi-Fi (5 GHz), Wi-Max (3.4-3.6 GHz), Sub-6 GHz 5G (3.3-4.2 GHz), and WLAN (5.15-5.825 GHz). The antenna also provides safe SAR value, low envelope correlation coefficient, good antenna gain, acceptable radiation efficiency, optimum Total Active Reflection Coefficient (TARC) value, low Channel Capacity Loss (CCL), good gain, and acceptable radiation efficiency across the frequency ranges. Simulated and measured performances of the antenna in the entire band are presented.

A compact highly flexible two-element wideband MIMO antenna based on modal analysis for 5G wireless applications

“…In Sub-6 GHz infrastructure, the network quality and channel capacity can be improved with the multiple input multiple output (MIMO) systems with a wider bandwidth and therefore this technology has become a research hotspot of the decade [1]. Recently, an ample amount of MIMO antenna research has been reported in the literature covering the Sub-6 GHz 5G band [2][3][4][5][6][7][8][9][10][11][12][13]. Most of the literature exhibits a trade-off between less bandwidth, gain or higher mutual coupling that hinders its application in realtime MIMO applications.…”

“…The offset feed configuration contributed to an isolation of 19 dB without any decoupling structure, however the bandwidth and the efficiency of the antenna is low. For wearable applications, a four-element wideband antenna is suggested in [4]. The antenna has a satisfactory radiation pattern with a wider bandwidth; however, the isolation between the components is quite minimal and the antenna volume is big.…”

8-port MIMO antenna at 27 GHz for n261 band and exploring for body centric communication

“…In [ 17 ], a mm wave 2-port MIMO antenna with sectoral slots on circular patch is investigated. Planar CPW fed antenna for UWB MIMO operation is proposed in [ 18 ] for wearable applications. A large decoupling network with defected ground structure is incorporated to enhance the port isolation.…”

“…Although, wider bandwidth and multiband response has been attained in plethora of papers, a significant shifting of resonance frequency has been observed due to structural deformation and body postures. In addition to this, restrictions of limited radiation power in body centric communication, and multipath fading effects caused by internal scattering/reflections of heterogeneous body tissue layers dramatically diminish the reliability/performance and robustness of communication [17][18][19][20]. Therefore, diversity technique MIMO is attaining much interest in body area networks.…”

Dual Band MIMO Antenna with High Isolation for GSM and WLAN Applications

“…Orthogonally placed two trapezoidal radiating elements with a rectangular stub in the ground offer high isolation [17]. A UWB MIMO antenna with orthogonally placed quad elements is designed on a flexible substrate for 5G and wearable applications [18]. Ring shaped slots in the ground are incorporated to obtain desired isolation between two crescent-shaped antenna elements [19].…”