Dielectric properties of Australia lignite at radio frequency Ning Zhang a,b, Lianguo Caic, Jiang Xu , Ranran Wang a,b, and Fa-De Li aCollege of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an, China; bShandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Tai’an, China; cIndustrial …