A Broadband Dual-Component Magnetic Probe With a New Structural Design for EMI Diagnostics

This work develops a broadband dual-component magnetic probe with a new structural design, tailored for electromagnetic interference (EMI) diagnostic applications. Unlike the conventional dual-component magnetic probes that measure the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_y</i> field components, the proposed probe employs a new detection architecture capable of simultaneously measuring two orthogonal <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_y</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_z</i> field components. The probe structure comprises a new detection architecture, a pair of striplines, two ground planes, and a pair of SubMiniature version A (SMA) connectors. This configuration enables concurrent measurement of the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_y</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_z</i> field components. To validate the design, the proposed probe was fabricated on a four-layer printed circuit board (PCB), evaluated through simulations using high-frequency electromagnetic simulation software, as well as measurements via a self-developed near-field measurement system with two distinct calibration kits (microstrip line and slot-line). Both simulated and experimental results demonstrate that the probe can not only have a wider operational bandwidth (4~15 GHz) but also realize simultaneous measurement of two orthogonal <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_y</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H_z</i> field components.