Improving the High-frequency Attenuation of Shunt Capacitor, Low-pass Filters

Author

C. N. Olsen
Thomas P. Van Doren, Missouri University of Science and TechnologyFollow
Todd H. Hubing, Missouri University of Science and Technology
James L. Drewniak, Missouri University of Science and TechnologyFollow
Richard E. DuBroff, Missouri University of Science and TechnologyFollow

Abstract

Circuit board mounted, shunt capacitive filters are less effective at high frequencies because of the mutual inductance (M) that exists between the input and output ports. An approximate expression for the mutual inductance is M = (μh/2π)ln(h/a); where h = via length and a = radius of the via connecting the capacitor to the return plane. The reduced mutual inductance associated with the new, three-terminal, surface-mounted capacitor results in more than 15 dB increased attenuation compared to two-terminal capacitors over the 0.3 - 6.0 GHz range with 50 Ω source and load terminations.

Recommended Citation

C. N. Olsen et al., "Improving the High-frequency Attenuation of Shunt Capacitor, Low-pass Filters," IEEE International Symposium on Electromagnetic Compatibility, vol. 1, pp. 487 - 489, Institute of Electrical and Electronics Engineers, Dec 2001.

Department(s)

Electrical and Computer Engineering

International Standard Serial Number (ISSN)

0190-1494

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Dec 2001