A novel microstrip network is proposed for simultaneously controlling and improving the isolation and impedance matching in a highly-coupled printed monopole antenna array. This easy-to-fabricate network with a reduced number of key parameters including only an inductive microstrip line between two feeds, some functional simple links and two shorted stubs is designed in a small area. A matrix-based study on the total system along with an equivalent analysis method on the subsystem is presented to simplify the total study, noticeably. Network-based closed-form equations for real and imaginary parts of the self and mutual admittance of the antennas are extracted to establish the conditions and determine the parameters. A good agreement between the simulation and measurement of the prototypes is also provided. The results propose a broad bandwidth about 200 MHz at 2.45 GHz with an improved matching over 15 dB from 2.39 to 2.5 GHz. In this band, the isolation is improved over 32 dB with a maximum of about 70 dB. Using this network, not only good space diversity and high polarization purity are achieved, but also the correlation coefficient is reduced, notably. According to these suitable specifications, this efficient circuit can be a promising design for new compact MIMO-based Wi-Fi/Bluetooth/WLAN systems.

提出了一种新型微带网络，用于同时控制和改善高耦合印刷单极天线阵列中的隔离度和阻抗匹配。这种易于制造的网络具有较少的关键参数，包括两个馈电之间的电感微带线、一些功能简单的链接和两个短接的短截线，其设计面积很小。提出了对整个系统的基于矩阵的研究以及对子系统的等效分析方法，以显着简化整个研究。提取天线自导纳和互导的实部和虚部的基于网络的闭式方程，以建立条件并确定参数。还提供了原型的模拟和测量之间的良好一致性。结果提出了在 2.45 GHz 下约 200 MHz 的宽带宽，在 2.39 至 2.5 GHz 范围内匹配度提高了 15 dB 以上。在该频段中，隔离度提高了 32 dB 以上，最大约为 70 dB。使用该网络，不仅实现了良好的空间分集和高极化纯度，而且相关系数显着降低。根据这些合适的规范，这种高效的电路可以成为基于 MIMO 的新型紧凑型 Wi-Fi/蓝牙/WLAN 系统的有前途的设计。