In this paper, a complementary split ring resonator (CSRR) loaded compact CPW-fed circular shaped monopole UWB antenna with dual band notch characteristics is designed on an FR-4 substrate. The propounded band-notched UWB antenna is integrated with two frequency selective surface layers referred as bandpass frequency selective surface (FSS-1) and reflector (FSS-2) to offer enhanced radiation performance. Bandpass FSS-1 enhances the gain of the antenna by improving directivity and reflector FSS-2 reflects back the backside radiation of the proposed antenna towards the forward direction thereby increasing gain and directivity of the proposed antenna. Furthermore, a two-element orthogonal MIMO antenna is proposed with improved gain using two FSS layers. The complete configuration of the proposed two-element MIMO antenna consists of CSRR-based radiating patches, monopole ground planes and two integrated FSS layers. The proposed MIMO antenna operates in UWB range from 3.46$$GHz to 16.02$$GHz with dual notches at 3.9$$GHz and 7.2$$GHz. Isolation between MIMO elements is greater than 23 dB. Both antennas are fabricated and investigated at 5.9$$GHz for vehicular communications. Maximum gain improvements of 8 dB and 6.4 dB are observed in case of the presented single element and MIMO antenna within the entire operating band due to the integration of dual FSS layers. The diversity performance of the suggested MIMO antenna is investigated by analyzing mean effective gain, envelope correlation coefficient, channel capacity loss and diversity gain parameters. The proposed MIMO antenna is a suitable candidate for vehicular and UWB wireless communication applications.

本文在 FR-4 基板上设计了一种具有双频带陷波特性的互补开环谐振器 (CSRR) 负载紧凑型 CPW 馈电圆形单极 UWB 天线。所提出的带切口 UWB 天线与两个频率选择表面层集成，称为带通频率选择表面（FSS-1）和反射器（FSS-2），以提供增强的辐射性能。带通FSS-1通过改善方向性来增强天线的增益，反射器FSS-2将所提出的天线的背面辐射反射回向前方向，从而增加所提出的天线的增益和方向性。此外，还提出了一种使用两个 FSS 层提高增益的两元件正交 MIMO 天线。所提出的两元件 MIMO 天线的完整配置由基于 CSRR 的辐射贴片、单极接地层和两个集成 FSS 层组成。拟议的 MIMO 天线在 3.46 的 UWB 范围内运行$$GHz 至 16.02$$GHz 双陷波 3.9$$GHz 和 7.2$$兆赫。MIMO 元件之间的隔离度大于 23 dB。两种天线均在 5.9 下制造和研究$$GHz 用于车辆通信。由于双 FSS 层的集成，在整个工作频段内所提供的单元件和 MIMO 天线的情况下，观察到最大增益改进为 8 dB 和 6.4 dB。通过分析平均有效增益、包络相关系数、信道容量损失和分集增益参数，研究了所建议的 MIMO 天线的分集性能。所提出的 MIMO 天线非常适合车辆和 UWB 无线通信应用。