Effects of Nonuniform Bias Magnetic Field on Left-Handed Ferrite Microstrip Line(Passive Devices/Circuits,<Special Section>Microwave and Millimeter-Wave Technology)

概要

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Transmission characteristics of a left-handed (LH) ferrite microstrip line are significantly affected by the nonuniform DC bias magnetic field in the ferrite substrate (internal magnetic field H_<in>) caused by the inhomogeneous demagnetizing effect because the strip conductors of these devices must be mounted at the edge of the ferrite substrate. Three dimensional analyses on the LH ferrite microstrip line are performed taking into account the nonuniform internal magnetic field H_<in>. The analytical results show that the nonuniform internal magnetic field under the strip conductor near the edge of the ferrite substrate is useful for spreading the frequency band of negative permeability and nonreciprocal operation, and for improvement of both the insertion and return losses of the LH ferrite microstrip line. Measured results of more than 20dB isolation with 2.2dB insertion loss and 1.33GHz bandwidth are corresponding well to the analytical results.
社団法人電子情報通信学会の論文
2007-09-01