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Microwave Interactions in Polyvinyl Chloride–Graphite Thick Film Resistors
K. V. Subrahmanium, Busi Rambabu, B. Poornaiah and Y. Srinivaasa Rao

The purpose of this paper is to study the microwave interactions in polymer thick film resistors, namely PVC-graphite thick film resistors and its applications in trimming of these resistors. We applied microwave radiation in the form of pulses of various pulse durations and with different powers to polymer thick film resistors and observed resistance variation with microwave radiation have been explained using a mathematical model. The paper shows the mathematical modeling for microwave trimming of polymer thick film resistors. The value of the paper is in showing that a new mathematical model is developed, which is used to explain the resistance variations of polymer thick film resistors with microwave radiation trimming technique. The research implication of this paper is that we can trim polymer thick film resistors, PVC-graphite thick film resistors using this method. The practical implication of this paper is that it shows with the help of a mathematical modeling of trimming of polymer thick film resistors, a new microwave trimming technique is suggested.

Keywords: Polymer Resistor, Microwave Radiation, Trimming technique, Composition, Grain size.

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