Double-negative reconfigurable resonator with cross-polarised split rings

Double-negative metamaterials using cross-polarised split-ring resonators in a microstrip line have been implemented. The split-ring resonators comprised quad ring structures and were connected with the microstrip line in series. Four different structures, with the shorted rings in varying locations, were fabricated to demonstrate reconfigurable bandpass characteristics. The effective permittivities and permeabilities were extracted using the Ziolkowski method. Excellent agreement between the developed circuit model and the measurement was observed up to 10 GHz.