Fifth-generation technology is not fully deployed in the world wireless communication till date. Millimeter-wave (mm-wave) band needs to be used due to plenty of available bandwidth and for achieving the goals of 5G such as greater data rate, ultra-high-speed video broadcasting, low latency services, and many more. Wideband antenna is required for 5G applications to access the high speed, low latency Internet services, and ultra-high-definition video streaming. Various bandwidth enhancement techniques have been reported by the researchers for microstrip antennas operating at microwave bands. High link losses, small wavelength, limited coverage, and environmental losses are the major challenges of mm-wave band. To mitigate these issues and satisfy 5G standard, an antenna with wide bandwidth, high gain, narrow steerable beam, high isolation, low side lobe levels, and multiband characteristics is required. Modifications in conventional antenna design techniques are required to achieve broader bandwidth along with stable radiation characteristics, improved gain, and low side lobe levels at mm-wave frequencies. This paper presents the survey of various bandwidth enhancement techniques which has been used in the 5G antennas designed by researchers. Reviews of some wideband 5G antennas with their performance comparisons are also discussed.

中文翻译：

---

用于 5G 天线的各种带宽增强技术的调查

迄今为止，第五代技术尚未在世界无线通信中得到充分部署。毫米波 (mm-wave) 频段需要使用，因为有足够的可用带宽以及实现 5G 的目标，例如更高的数据速率、超高速视频广播、低延迟服务等等。5G 应用需要宽带天线来访问高速、低延迟的互联网服务和超高清视频流。研究人员已经报告了各种带宽增强技术，用于在微波频段工作的微带天线。高链路损耗、小波长、有限覆盖和环境损耗是毫米波段的主要挑战。为了缓解这些问题并满足 5G 标准，具有宽带宽、高增益、窄可控波束、高隔离度的天线，低旁瓣电平，并且需要多频带特性。需要对传统天线设计技术进行修改，以实现更宽的带宽以及稳定的辐射特性、改进的增益和毫米波频率下的低旁瓣水平。本文介绍了研究人员设计的 5G 天线中使用的各种带宽增强技术的调查。还讨论了一些宽带 5G 天线的评论及其性能比较。本文介绍了研究人员设计的 5G 天线中使用的各种带宽增强技术的调查。还讨论了一些宽带 5G 天线的评论及其性能比较。本文介绍了研究人员设计的 5G 天线中使用的各种带宽增强技术的调查。还讨论了一些宽带 5G 天线的评论及其性能比较。