Millimeter wave notch filters based on ferromagnetic resonance in hexagonal barium ferrites

Young-Yeal Song; Ordóñez-Romero, César L.; Mingzhong Wu
October 2009
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p142506
Academic Journal
A hexagonal ferrite-based millimeter wave notch filter was demonstrated. The filter consists of an M-type BaFe12O19 (BaM) slab sitting on top of a stripline. The band-stop filtering response originates from the ferromagnetic resonance absorption in the BaM slab. The BaM slab has an in-plane uniaxial anisotropy field of 17 kOe. This anisotropy field facilitates the operation of the filter beyond 50 GHz without a need of high external fields. The operating frequency increases linearly with the external field, while the bandwidth versus field profile shows a U-shaped response. The physical mechanisms for these responses were discussed.


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