In this paper, a very small size (20 × 14.75 mm²) triple-band multiple-input multiple-output (MIMO) microstrip patch antenna for WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.5/3.5/5.5 GHz) wireless applications. The goal of this paper is to merge these two wireless standards into a single antenna that can be easily accommodated inside the devices operating in three different frequency ranges. The proposed MIMO antenna consists of an asymmetric coplanar strip (ACS) feedline loaded with an inverted L-shaped slot and a meanderline. The inverted L-shaped slot and the meanderline both having an electrical length 0.5λ, are responsible for the achieving the operating band around 3.5 and 2.4 GHz, respectively whereas the ACS feedline is responsible for the generation of 5 GHz frequency band. The fabricated prototype of the proposed MIMO antenna when tested, shows three distinct frequency bands; I from 2.38 to 3.00 GHz, II from 3.21 to 3.61 GHz and III from 5.02 to 6.18 GHz that covers entire frequency bands of WLAN and WiMAX wireless applications along with different standards of IEEE 802.11 including a/b/j/p/g/n/ac/ax. The peak gain in I, II and III frequency bands is 7.93, 4.23 and 7.57 dBi, respectively. In addition, the diversity performance in terms of envelope correlation coefficient, diversity gain, multiplexing efficiency, total active reflection coefficient, and mean effective gain is also performed for the proposed MIMO antenna.

本文的尺寸非常小（20×14.75 mm ²）用于WLAN（2.4 / 5.2 / 5.8 GHz）和WiMAX（2.5 / 3.5 / 5.5 GHz）无线应用的三频多输入多输出（MIMO）微带贴片天线。本文的目标是将这两个无线标准合并为一个天线，可以很容易地将其容纳在以三个不同频率范围运行的设备内部。所提出的MIMO天线由非对称共面带（ACS）馈线组成，该馈线上装有倒L形槽和曲折线。电气长度为0.5λ的倒L形槽和曲折线分别负责实现3.5 GHz和2.4 GHz附近的工作频带，而ACS馈线负责生成5 GHz频带。所建议的MIMO天线的预制原型在测试时显示了三个不同的频段。我从2.38到3。00 GHz，II从3.21到3.61 GHz和III从5.02到6.18 GHz，涵盖WLAN和WiMAX无线应用的整个频带以及不同的IEEE 802.11标准，包括a / b / j / p / g / n / ac / ax 。I，II和III频段的峰值增益分别为7.93、4.23和7.57 dBi。另外，还针对所提出的MIMO天线执行了在包络相关系数，分集增益，复用效率，总有效反射系数和平均有效增益方面的分集性能。