Left-Handed Characteristics of Ferrite Microstrip Line Magnetized to Wave Propagation

Left-handed characteristics of microstrip line on the longitudinally magnetized ferrite substrate are investigated with both theoretically and experimentally. Transmission characteristics of the line are estimated by using an equivalent circuit model, and the high frequency structure simulator (HFSS) based on the finite element method. Experiments are undertaken using polycrystalline yttrium iron garnet substrate having 30 times 15 mm in thickness of 1 mm. Expected left-handed response within negative permeability region is found and agrees well with theory. Phase shifter tuned by the magnetic field is proposed as an application of the left-handed ferrite line.