Abstract
Two types of conducted noise suppressors, which dissipate noise current energy before radiated as noise waves, were developed using Ni-Zn ferrite films synthesized from an aqueous solution. In the “sheet type, Ni-Zn ferrite films of 5 μm thickness were deposited on polyimide sheets. In the “direct-deposition type, the films were deposited directly on to the microstrip line fabricated on printed circuit board (PCB). The transmission loss ΔPlossper thickness for the “sheet type and “direct-deposition type were 16 and 20 times larger, respectively, than that for commercialized composite noise suppressing sheets. Both types of ferrite-film noise suppressors exhibited reflection coefficient S11 small enough (< -10 dB) to be applied as conducted noise suppressors up to 10 GHz.
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