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In this paper, a microwave dielectric sensor is presented using an open-ended microstrip line. It is fabricated in a standard 0.25 µm SiGe BiCMOS process (fT/fmax = 180/220 GHz). A theoretical basis of open-ended microstrip line as dielectric sensor has been proposed and it is used as a permittivity dependent capacitor in the Colpitts oscillator. The sensor distinguishes permittivities ranging from...
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