Design of the Ferrite Band-pass Filter with Dual Tunability

This report presents the results of dual-tunable band-pass filter characteristics measurement. The filter operation is based on the straight-edge ferrite resonator (made from Y-type hexaferrite) symmetrically coupled to the input and output microstrip transmission lines. The filter demonstrated magnetic tunability within 8–12 GHz frequency range by the in-plane bias magnetic field and electric control of the passband center frequency due to current-induced nonlinear magnetoelectric effect. The electric tuning of the center frequency up to $-(115\pm 90)$ MHz was obtained for the 200 mW of DC electric power applied to the ferrite resonator.