NDLI: Improved transmission-line attenuators for integrated power filters in the RF band

Content Provider	IEEE Xplore Digital Library
Author	Colin Kydd Campbell van Wyk, J.D. Wolmarans, P.
Copyright Year	1999
Abstract	Differential mode electromagnetic interference (EMI) at radio frequencies (RF) in compact integrated power electronic converter modules-as due in part to semiconductor switching and structural electromagnetic coupling-can be suppressed by the use of lossy transmission line lowpass filters. A previously reported lowpass filter design for such a system employed a Cu-Al/sub 2/O/sub 3/-Ni-BaTiO/sub 3/-Ni-Al/sub 2/O/sub 3/-Cu lossy uniform width planar transmission line. where the low-permittivity Al/sub 2/O/sub 3/ ceramic wafer merely separates the Cu and Ni conductors. The higher-conductivity Cu conductors served to handle kW-level power frequencies. Above power frequencies, skin-depth restrictions cause current diversion from the Cu line into the inner segment of Ni-BaTiO/sub 3/-Ni that provides subsequent attenuation of milliwatt-level spurious RF interference. Velocity reduction due to the high-permittivity barium titanate (BaTiO/sub 3/) ceramic (/spl epsiv//sub r//spl sim/12,000) enabled compact integrated package size construction (e.g., 10 mm /spl times/1.5 mm /spl times/130 mm). With the aim of increasing the lowpass cutoff response slope, the current paper examines a prototype non-uniform (in width) planar Ni-BaTiO/sub 3/-Ni constituent attenuator segment. For ease of one-dimensional (1-D) ABCD matrix analysis, a four-section Ni-BaTiO/sub 3/-Ni planar attenuator-comprised of four cascaded uniform sections of decreasing step width-was fabricated as a first approximation to an exponential taper. While good agreement was obtained between the predicted and experimental responses of the reverse-connected (narrow-to-wide) attenuator up to about 30 MHz, the discrepancy between the experimental and theoretical forward-connected (wide-to-narrow) frequency responses is attributed here to three-dimensional current constrictions at step interfaces. It is postulated that this can be overcome by the alternate use of a linearly- or an exponentially-tapered line.
Sponsorship	IEEE Components, Packaging, and Manufacturing Technology Society
Starting Page	311
Ending Page	316
Page Count	6
File Size	250990
File Format	PDF
ISSN	15213331
Volume Number	27
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmission lines Attenuators Power filters Radio frequency Electromagnetic interference Electromagnetic coupling Propagation losses Planar transmission lines Ceramics Conductors
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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