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=(muh/2pi)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
T. H. Hubing et al., "Improving the High-Frequency Attenuation of Shunt Capacitor, Low-Pass Filters," Proceedings of the 2001 IEEE International Symposium on Electromagnetic Compatibility, 2001, Institute of Electrical and Electronics Engineers (IEEE), Jan 2001.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.2001.950689
2001 IEEE International Symposium on Electromagnetic Compatibility, 2001
Electrical and Computer Engineering
Keywords and Phrases
0.3 to 6.0 GHz; 50 Ohm; Capacitors; Equivalent Circuits; High-Frequency Attenuation Improvement; Inductance; Input Ports; Load Terminations; Low-Pass Filters; Mutual Inductance; Output Ports; Shunt Capacitor Low-Pass Filters; Source Terminations; Surface Mount Technology; Three-Terminal Surface-Mounted Capacitor
Article - Conference proceedings
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