In this paper, a compact 4-port band-notched multi-input-multi-output (MIMO) antenna with asymmetric coplanar strip (ACS) feed is presented for ultra-wide band (UWB) applications. The MIMO antenna is comprised of four semi-elliptical radiators with ACS feed for UWB applications and it is printed on inexpensive FR4 substrate of size 48 × 52 mm2 with ɛr = 4.4 and 1.6 mm height. The impedance characteristics of the suggested MIMO antenna ranges from 2.7 to 11 GHz with a band-notched behavior from 3 to 4 GHz to reduce the interception with WiMAX applications, and the isolation level over the achieved band is more than 20 dB between any two adjacent elements. Moreover, the radiation pattern of the proposed UWB antenna is almost omnidirectional with an average realized gain of 3.5 dBi over the entire achieved frequency band. The proposed ACS-fed antenna is confirmed by fabricating and measuring it's impedance and radiation characteristics. Finally, good consistency between simulation and measured outcomes is obtained confirming the validity of the MIMO antenna for real-life UWB wireless systems.

在本文中，针对超宽带（UWB）应用，提出了具有非对称共面带（ACS）馈源的紧凑型4端口带槽多输入多输出（MIMO）天线。MIMO天线包括四个半椭圆形辐射器与ACS饲料UWB应用和它被打印尺寸48×52毫米便宜FR4基板上2与ɛ ř= 4.4和1.6毫米高度。建议的MIMO天线的阻抗特性在2.7至11 GHz的范围内，具有3至4 GHz的带槽特性，以减少WiMAX应用的拦截，并且在所获得的频段上，任何两个相邻频段之间的隔离度均超过20 dB元素。而且，所提出的UWB天线的辐射方向图几乎是全向的，在整个实现的频带上的平均实现增益为3.5 dBi。拟议的ACS馈电天线通过制造和测量其阻抗和辐射特性得到确认。最终，获得了仿真结果和测量结果之间的良好一致性，从而确认了MIMO天线对于现实UWB无线系统的有效性。