Design of compact loop-wire medium at radio frequencies for magnetic resonance imaging

In this paper we show how loop wire medium can allow to tune the index of refraction of metamaterial. The principle and a equivalent circuit is presented in a first time. Then in order to show the influence of their geometric parameters on the plasma frequency, simulations of loop wire medium with a program based on method of moment (MoM) are driven. Comparison with classical wire medium show a decrease of the plasma frequency. In a second step, simulations of loop wire medium combined with a negative permeability structure are carried out, to show their influence on the negative index of refraction: extraction of the negative index of refraction shows a decrease in the presence of medium with high inductance.