This communication proposes a two-port multiple-input–multiple-output (MIMO) antenna fabricated on a small size colored resin plastic button where full dielectric properties of the button substrate are evaluated before designing the MIMO antenna. The antenna uses partial ground plane and two coaxial feeds for the excitation of two semicircular shaped patch elements. A very simple copper ring around the four slots of the button is used to obtain very high port isolation. The antenna covers the frequency range from 7.96 to 8.76 GHz and fulfills the International Telecommunication Union (ITU) band (8–8.5 GHz) for fixed wireless communication application. It provides very high port isolation (>21 dB) and diversity gain (DG > 9.8 dB) over the whole band. The investigated envelope correlation coefficient (ECC) (<0.18) and channel capacity loss (CCL) (<0.24 b/s/Hz) are potentially very low. The mean effective gain (MEG) (±0.3 dB) over the entire application band is found in a well-accepted range. The prototype could be mounted on a textile material of on-body cloths for different wearable monitoring purposes. The simulated and measured outcomes are matched with a satisfactory level to mark the proposed two-element two-port button antenna as a suitable MIMO candidate for the specified application band.

中文翻译：

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用于设计小型MIMO天线的彩色树脂塑料按钮的介电性能评估

该通讯提出了一种在小尺寸彩色树脂塑料按钮上制造的双端口多输入多输出 (MIMO) 天线，其中在设计 MIMO 天线之前评估按钮基板的完整介电特性。天线使用部分地平面和两个同轴馈电来激励两个半圆形贴片元件。在按钮的四个插槽周围使用一个非常简单的铜环来获得非常高的端口隔离度。该天线覆盖 7.96 至 8.76 GHz 的频率范围，满足国际电信联盟 (ITU) 频带 (8-8.5 GHz) 的固定无线通信应用要求。它在整个频段内提供非常高的端口隔离度 (>21 dB) 和分集增益 (DG > 9.8 dB)。调查的包络相关系数 (ECC) (<0. 18) 和信道容量损失 (CCL) (<0.24 b/s/Hz) 可能非常低。整个应用频带内的平均有效增益 (MEG) (±0.3 dB) 在可接受的范围内。原型可以安装在体式布料的纺织材料上，用于不同的可穿戴监控目的。模拟和测量的结果与令人满意的水平相匹配，以将建议的二元二端口按钮天线标记为指定应用频段的合适 MIMO 候选者。