A design-oriented analytical approach to simplify the computational aspects of low pass planar multi EMI filters
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Date
2016
Authors
Botes, Nicholus James
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Abstract
Industry pressures of fabricating smaller components coupled with Electromagnetic
Compliance (EMC) regulations are driving the development of alternative solutions in
the EMI space. A possible solution to EMC lies in distributed frequency-selective
filters, such as multipath conductors. The involved complexity in the field, however,
hinders interest and capabilities for potential researchers and engineers working in
this domain. The ability to design multipath conductors is identified as a restrictive
aspect to advancing in the field of low pass filter design using these conductors. This
work aims to develop a design-oriented analytical approximation approach, using
established methods, for a given desired resistance-frequency plot. The method aims
to provide designers with an initial design that can be refined subsequently using
more involved techniques. This stands to broaden the scope of this field from experts
to non-experts by allowing easier analysis and design processes. The approach
develops from a low frequency method of modelling multipath conductors as separate
structures that are valid over different frequency bands. A method is developed to
model multipath structures as theoretical single layer conductors composed of
effective material property values. This approach forms the basis on which the design oriented
equations are developed solving for the material properties of the required
structure. The approaches developed are against the exact full frequency analytical
equations. Practical aspects to the design of multipath conductors in this manner are
discussed with main goal of feasible, stable design.