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Abstract
This paper presents a twelve-port multiple-input multiple-output (MIMO) antenna system for multi-mode 4G/5G smartphone applications. Characteristic mode analysis (CMA) is used to illustrate the operation principle and optimize the geometrical structure of the antenna system. The proposed MIMO antenna system consists of a 4G antenna module and a 5G antenna module. The 4G antenna module is a 2 × 2 MIMO antenna array capable of covering the LTE700/2500/3400, GSM850/900, DCS, PCS, UTMS, 2.4-GHz WLAN, and 3.5-GHz WiMAX, which consists of two symmetrical antenna elements, and uses protruded ground to improve the isolation between the two adjacent 4G module antenna elements. The 5G antenna module is a 10×10 MIMO antenna array composed of ten identical monopole antennas and operates at the bands of 3.31 3.70 GHz and 4.46 5.40 GHz, covering the 3.5-GHz band (3.4 3.6 GHz) and 4.9-GHz band (4.8 5.0GHz) for 5G applications. The proposed antenna is fabricated, and the experimental results agree with the simulated results well. The calculated envelope coefficient correlation is lower than 0.5, indicating that the diversity performance meets the need of the MIMO antenna system. All the features make the antenna suitable for multi-mode 4G/5G smartphone applications.
Highlights
With the development of wireless communications, multimode and multi-band antennas are required for mobile phones to incorporate more functions and services and support more communication standards
Due to the limited space reserved for smartphone antennas, the design of a multi-band MIMO antenna system with low mutual coupling is a serious technical challenge
As the calculated envelope correlation coefficient (ECC) are all better than the acceptable criterion of lower than 0.5, a desirable diversity capability is achieved by the proposed MIMO antenna
Summary
With the development of wireless communications, multimode and multi-band antennas are required for mobile phones to incorporate more functions and services and support more communication standards. In order to illustrate the operating property of the proposed 4G antenna module, the characteristic mode analysis of 4G antennas with different configurations is presented respectively. In order to obtain the frequency band of WiMAX and LTE3400 applications, structure #3 is added to the 4G antenna system Fig. presents the simulated return loss of antennas with different configurations It is evident from this figure that the low frequency band (0.6-0.9 GHz) is mainly excited by adding structure #1. In order to obtain a higher effective frequency band for WiMAX and LTE3400 applications, two rectangular slots are etched on structure #3 (see Antenna (3)). The measured total efficiency is about 42.5%-79.5% at the lower band, and about 75.1%-83.3% at the higher band
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