“…[3,4]. In recent years, with the development of experimental technology and theory, many different types of LHMs structures, including open rings [5][6][7][8], fishnet type [9], composed silver slabs with parallel nanorods [10], S type [11], spiral type [12], H type [13], and L type [14], have been designed. However, most of these designs only performed a single negative refraction frequency band, in which the permittivity and permeability are both negative, and one primary resonance is offered.…”