Optimization design and development of UHF omnidirectional wideband antenna for PD detection in substationZhen-hua Xing, Zhen Wang, Hang Xu, Miao Xu, Xiao-lin Mou, Lu-xiao Wu, Kun Yang and Zhao LiuE3S Web Conf., 256 (2021) 01012DOI: https://doi.org/10.1051/e3sconf/202125601012