Near-Field Shielding Analysis of Conformal Coating Materials for Integrated Circuits

This article analyzes a near-field shielding performance of conformal shielding materials for integrated-circuits (ICs) by experiments. Two test boards with loop-type and patch-type patterns are designed to generate magnetic-field and electric-field, respectively. These sources mimic typical electro...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2022-10, Vol.64 (5), p.1622-1631
Main Author: Park, Hyun Ho
Format: Article
Language:English
Subjects:
Coatings
Couplings
Electric fields
Electromagnetic (EM) pulse
Electromagnetic cells
electromagnetic shielding
ferrite sheet
Frequency measurement
Frequency ranges
frequency-dependent complex permea- bility
Integrated circuits
Magnetic materials
Magnetic noise
Magnetic shielding
Near fields
Pastes
slots
Strip
Transmission line measurements
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Summary:This article analyzes a near-field shielding performance of conformal shielding materials for integrated-circuits (ICs) by experiments. Two test boards with loop-type and patch-type patterns are designed to generate magnetic-field and electric-field, respectively. These sources mimic typical electromagnetic radiations from actual ICs. For shielding analysis, single-layered conductive materials, multilayered conductive and magnetic materials, hybrid materials with a mixture of conductive and magnetic pastes are considered as conformal shielding materials, which are coated on the test boards for measurements. Magnetic-field and electric-field shielding effectiveness (SE) of the materials evaluate by measurements using loop-probe, strip-line, and gigahertz transverse electromagnetic cell at the frequency range from 300 kHz to 3 GHz. Near-field SEs measured by three methods correspond generally well with each other at the frequency range up to a few hundred MHz. At the higher frequency, the ambient EM environment can affect the accuracy of the near-field measurements by the loop-probe and strip-line. For validation, numerical simulation is fulfilled and compared with measured results. Theoretical interpretation based on the Schelkunoff's SE decomposition is also addressed.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2022.3198274