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An ultra-wideband bandpass filter (UWB) consisting of stepped-impedance resonators cascaded by parallel-coupled two-line and three-line structures is designed to satisfy Federal Communications Commission (FCC)'s spectrum mask. Firstly, a simpler equivalent circuit for the parallel-coupled three lines is derived based on the transmission line theory. Then, after the derivation of the Chebyshev-type...
We investigated the influence of the vibration characteristics of a head/disk system in contact recording. The frequency response function (FRF) and Q factor were used to analyze the vibration of the head-disk interface motion in sliding contact tests. The effect of the natural frequencies of the various disks is examined. The Q factor, obtained from the FRF of the vibration of the head-disk interface...
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