Octagonal split resonant rings composite metal-wires to realize negative refraction

Abstract

Traditional C-shaped split resonant ring(SRR) composite metal wire periodic structure is studied through simulation and experiment. Comparing the simulation result of negative permeability material based on periodic structure of octagonal SRR with that of closed split resonant rings (CSRRs), we ind that octagonal SRRs can produce negative permeability. A new kind of left-handed material combined with octagonal resonators and copper wires is de signed, and the simulation result shows that the structure has good left-hand property in a certain frequency band. Experimental samples of two different sizes are fabricated, in which negative refraction happens in ranges of 9.8—15 GHz and 9.5—15 GHz separately: small size sample has more broad negative band but lower transmission rate.By comparison with the experiment result of C-shaped sample we ind that the octagonal SRR hasa high transmission rate , but energy transmitting through new designed structure shows a more proportion in negative field, which demonstrates better negative behavior. This has important significance on design and study on new periodic structures of left-handed materials.