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Experimental investigation on a magnetically tunable ferrite resonator antenna

An experimental investigation of a novel ferrite resonator antenna has been performed. A ferrite antenna with rectangular cross-section was subjected to a static magnetic bias field, applied in two orthogonal directions, in a plane parallel to the antenna height. The effects on the resonant frequency, radiation efficiency and farfield patterns of the antenna were investigated. A maximum frequency shift of ± 8% about the unbiased resonant frequency was achieved. The efficiency of the ferrite resonator antenna was measured to be 97.7%, unbiased, and a minimum of 93% with magnetic bias.