Ferromagnetic material with negative permeability for tunable left-handed devices

Microwave devices as filters or couplers demand nowadays small sizes and broad bandwidth. Because of their unusual characteristics, left-handed materials are an ideal candidate for this demand. This paper proposes a new concept for left- handed materials based on ferromagnetic nanowired substrates, which provides at the same time a planar and tunable solution. The concept is based on an accurate model for the permeability of the nanowired substrate.