Deca‐band structure reutilization MIMO antenna for 4G / 5G full‐screen metal frame smartphone operation

Abstract

This article presents a deca-band multi-input multi-output (MIMO) antenna for full-screen metal frame smartphone, which covers wideband of GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, WLAN/WiMAX, N78, and sub-6 GHz (4.8-5.1 GHz) bands table. Two kinds of antenna structures are positioned on the long side edge and form two 2 Â 2 MIMO array, covering the low-band (824-960 MHz) and mid-band (1710-2690 MHz/3300-3800 MHz), respectively. Four slot antennas are distributed on both sides of the short side edge.Each slot is connected to an antenna structure on the long side edge, sharing one port to form the high-band structure. By reutilization the low and mid-band structures, the high-band structure can achieved a wide band bandwidth without any additional matching structures. The high-band structure is composed of 4 Â 4 MIMO array and covers the band of 4800-5825 MHz. A prototype of the proposed MIMO antenna is fabricated and measured. The isolation of the antenna is larger than 15 dB, the efficiencies are between 31% and 63%, and the ECCs is less than 0.3, which shows that the proposed antenna has great potential in the future 4G/5G smartphone application.

Compact Sub 6 GHz Dual Band Twelve-Element MIMO Antenna for 5G Metal-Rimmed Smartphone Applications

“…Moreover, they are durable and can effectively dissipate heat. Some studies [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] have designed MIMO antennas for smartphones with metal frames. In other studies, multi-antenna systems have been configured on a mobile phone device with the antennas being placed at appropriate distances from each other to optimize the isolation between the antennas [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

“…To design decoupling mechanisms or achieve impedance matching, integrated metal-frame MIMO antennas for smartphones have been connected with components such as capacitors or inductors [ 14 , 15 , 16 , 17 , 18 ]. In [ 14 ], the authors presented a MIMO antenna for a full-screen metal-frame smartphone that covered the low-band (824–960 MHz), mid-band (1710–2690 and 3300–3800 MHz), and high-band (5800–5825 MHz) frequencies. The low-band and mid-band antennas added capacitors and inductors as a matching circuit for impedance adjustment.…”

“…MHz-3800 MHz (with a 50.4 mm spacing between the antennas)[15], and the radiation efficiency was reported to range from 36% to 58% at 4800 MHz-5000 MHz (with a 21 mm spacing between the antennas)[14]. It is important to note that metal frames can have an impact on radiation efficiency due to their ability to reflect, absorb, or scatter RF energy, resulting in radiation loss or non-uniform radiation patterns.…”

Application of switchable 4G/5G dual antenna system for laptops

“…As a result, the development of small and low‐profile antennas for mobile devices is always ongoing, and those designed to cover the 4G and 5G bands can be found in Refs. [2–24].…”

“…Nevertheless, they require a certain profile height that many antennas are incorporated matching circuit designs to achieve antenna shrinkage [2][3][4][5][6]. With the demand for large screens with high display-to-body ratios, metal back covers or metal bezels, there are antenna designs with integrated metal bezels and metal ground plane perimeters [8][9][10][11][12][13][14][15][16][17].…”