A coplanar waveguide- (CPW-) fed dual-band multiple-input multiple-output (MIMO) antenna for 2.45/5.5 GHz wireless local area network (WLAN) applications is presented in this paper. The presented MIMO antenna consists of two identical trapezoidal radiating elements which are perpendicular to each other. The size of the entire MIMO antenna is 50 × 50 × 1.59 mm³, which is printed on a FR4 substrate. The measured impedance bandwidth of the proposed antenna is 2.25–3.15 GHz and 4.89–5.95 GHz, which can cover IEEE 802.11 a/b/g frequency bands. A rectangular microstrip stub is introduced to achieve a good isolation which is less than −15 dB in both operation frequency bands. The measured peak gain is 5.59 dBi at 2.45 GHz and 5.63 dBi at 5.5 GHz. The measured antenna efficiency is 77.8% and 80.4% in the lower and higher frequency bands, respectively. The ECC values at the lower and higher frequencies are lower than 0.003 and 0.01, respectively.

中文翻译：

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用于 IEEE 802.11 a/b/g 应用的两端口 CPW 馈电双频 MIMO 天线

本文介绍了一种用于 2.45/5.5 GHz 无线局域网 (WLAN) 应用的共面波导 (CPW) 馈电双频多输入多输出 (MIMO) 天线。所提出的 MIMO 天线由两个相同的梯形辐射元件组成，它们彼此垂直。整个 MIMO 天线尺寸为 50 × 50 × 1.59 mm ³，印刷在 FR4 基材上。建议天线的测量阻抗带宽为 2.25-3.15 GHz 和 4.89-5.95 GHz，可以覆盖 IEEE 802.11 a/b/g 频段。引入矩形微带短截线以实现良好的隔离，在两个工作频段均小于 -15 dB。测得的峰值增益在 2.45 GHz 时为 5.59 dBi，在 5.5 GHz 时为 5.63 dBi。测得的天线效率在较低频段和较高频段分别为 77.8% 和 80.4%。较低和较高频率下的 ECC 值分别低于 0.003 和 0.01。