Ferromagnetic nanowire (FMNW) self-biased H-plane resonance isolator

A novel resonant type H-plane isolator based on a ferromagnetic nanowire (FMNW) slab is presented. As a result of the remanence property of FMNW materials, the device is self-biased and therefore does not require any magnet. Moreover, the structure does not suffer from the conventional H-plane isolator drawback of demagnetization, which renders this configuration, characterized by superior heat dissipation capability, a competitive alternative to the E-plane resonance isolator. The inherent remanence of the FMNW material makes the shorter double and quadruple slab configurations more practical than their conventional ferrite counterparts. The proposed device is very compact, lightweight, and low-cost. Simulations based on two different methods, the finite integration technique (FIT) and the finite element method (FEM), predict an isolation of over 20 dB and insertion loss of less than 1 dB for a relatively high band width of 6 GHz at the center frequency of 20 GHz.