Takafumi Kai

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SUMMARY Interfaces between a coaxial structure and a post-wall waveguide are proposed as the essential components for cost-effective millimeter-wave modules. PTFE substrate is selected in terms of loss and manufacturability. The reflection and the transmission characteristics are investigated. The short-stepped and the short-taper-stepped feeding structures(More)
In the field of vibration control, accelerometers are widely used as feedback sensors. In addition, according to state feedback control theory, detections of velocity and displacement signals are required to improve anti-vibration performance. Then, an absolute displacement sensor is proposed by modifying a control loop of a seismo-type velocity sensor.(More)
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