Wideband electronically tunable microwave bandstop filters using iron film-gallium arsenide waveguide structure

A wideband electronically tunable microwave bandstop (notch) filter has been realized using ultrathin iron film-gallium arsenide (FeGaAs) material structure. A tuning range as large as 8 to 27 GHz for the peak absorption carrier frequency of a propagating microwave has been accomplished.