Improving the high-frequency attenuation of shunt capacitor, low-pass filters

Author

Olsen, C.N. ; Van Doren, T.P. ; Hubing, T.H. ; Drewniak, J.L. ; DuBroff, R.E.

Author_Institution

Dept. of Electr. & Comput.Eng., Missouri Univ., Rolla, MO, USA

Volume

1

fYear

2001

fDate

2001

Firstpage

487

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

Keywords

capacitors; equivalent circuits; inductance; low-pass filters; surface mount technology; 0.3 to 6.0 GHz; 50 ohm; high-frequency attenuation improvement; input ports; load terminations; mutual inductance; output ports; shunt capacitor low-pass filters; source terminations; three-terminal surface-mounted capacitor; Attenuation; Capacitors; Equations; Inductance; Low pass filters; Magnetic flux; Resonant frequency; Shunt (electrical); Transmission line measurements; Transmission line theory;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 2001. EMC. 2001 IEEE International Symposium on

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-6569-0

Type

conf

DOI

10.1109/ISEMC.2001.950689

Filename

950689