Electromagnetic Activity of Chiral Media Based on Crank Inclusions

Materials with electromagnetic activity at microwave frequencies are usually made by spreading helical inclusions into a host medium. A new manufacturing technique of chiral media based on the inclusion of three segment wire hooks (cranks) is presented in this letter. We show that the random inclusion of many cranks into a host medium produces electromagnetically active materials. Based on a free-wave experimental system, we have found that the transmitted wave through the material is rotated with respect to the incident one. First results seem to be in agreement with the typical behavior of chiral media at the resonant frequency.