Analysis of a Low-Pass Filter Employing a 4-pin Capacitor

A. Ritter
Todd H. Hubing, Missouri University of Science and Technology
Thomas Van Doren, Missouri University of Science and Technology
Theodore M. Zeeff

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Capacitors with two or three leads tend to make poor low-pass filters at high frequencies (e.g. greater than 100 MHz) due to the mutual inductance between the input and output sides of the filter. This work proposes a four-lead low-pass filter capacitor design that minimizes the magnetic flux coupling between the input and output. Measurements of a prototype capacitor confirm that it performs significantly better than a typical two-lead capacitor at high frequencies.