A High-Frequency and High Spatial Resolution Probe Design for EMI Prediction

In this paper, a simple and accurate equivalent circuit of the magnetic probe is proposed. Based on the equivalent circuit, a high-frequency probe for near-field measurements is proposed, manufactured, and tested. To increase its working frequency, its parasitic inductance and capacitance are reduce...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-08, Vol.68 (8), p.3012-3019
Main Authors: Yang, Rui, Wei, Xing-Chang, Shu, Yu-Fei, Yang, Yan-Bin
Format: Article
Language:English
Subjects:
Apertures
Calibration
Coplanar waveguides
Electric fields
Electromagnetic interference
equivalent circuit
Equivalent circuits
Frequencies
high-frequency probe
Inductance
Magnetic circuits
Magnetic fields
Magnetic noise
Magnetic probes
Magnetic resonance
Magnetic shielding
Metallizing
Microstrip transmission lines
near-field scanning
Probes
Scanning
Spatial resolution
Substrates
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Summary:In this paper, a simple and accurate equivalent circuit of the magnetic probe is proposed. Based on the equivalent circuit, a high-frequency probe for near-field measurements is proposed, manufactured, and tested. To increase its working frequency, its parasitic inductance and capacitance are reduced by using a small loop aperture and a tapered transition. The working frequency of the probe is up to 30 GHz. At the same time, sidewall metallization and bottom-vias are used in the probe, which result in a good performance of electric field suppression. The transmission section of the probe is optimized at high frequencies by using via fence and coax-thru-hole vias. The magnetic field probe is built on a four-layered printed circuit board with Rogers substrate. The loop aperture size of the probe is 250\,\,\mu \text{m}\,\,\times 250\,\,\mu \text{m} , so it has a high spatial resolution and is helpful to measure the detailed magnetic field from a small device. The probe is calibrated by a standard coplanar waveguide with a backside ground (CPWG). Finally, a near-field scanning system with the fabricated probe is set up to test the magnetic field above an unknown CPWG and microstrip line. From the near-field scanning results, it can be concluded that the probe can accurately measure the magnetic field over a wide frequency band.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2018.2869181