An artificial electro-ferromagnetic meta-material demonstrates the design of
tunable
band-gap and tunable bi-anisotropic materials. The medium is obtained using a composite
mixture of dielectric, ferro-electric, and metallic materials arranged in a periodic
fashion. By changing the intensity of an applied DC field the permeability of the
artificial electro-ferromagnetic can be properly varied over a particular range
of frequency. The structure shows excellent Electromagnetic Band-Gap (EBG) behavior
with a band-gap frequency that can be tuned by changing the applied DC field intensity.
The building block of the electro-ferromagnetic material is composed of miniaturized
high Q resonant circuits embedded in a low-loss dielectric background. The resonant
circuits are constructed from metallic loops terminated with a printed capacitor
loaded with a ferro-electric material. Modifying the topology of the embedded-circuit,
a bi-anisotropic material (tunable) is examined. The embedded-circuit meta-material
is treated theoretically using a transmission line analogy of a medium supporting
TEM waves.