An Ultrawideband Electric Probe based on U-Shaped Structure for Near-Field Measurement from 9 KHz to 40 GHz


A normal electric probe with miniature size and ultrawideband characteristic is proposed in this letter. The probe is fabricated in a four-layer printed circuit board (PCB) with a high-performance dielectric RO4003C and RO4450. The minimum width of the probe is 4 mm, and the length of probe is 48 mm. The probe can be used in compact and complex space like PCB and integrated circuit. The designs of U-shaped structure and tuning element matrix are used to expand the work band and optimize the impedance of signal via. The work band of probe can cover from 9 kHz to 40 GHz. It can improve the test efficiency in ultrawideband application compared with series probe. The sensitivity of the probe is higher about 12 dB than commercial probe above 1 GHz, and the spatial resolution is 1 mm when the height of probe is 0.3 mm. The proposed probe is verified with simulation in full-wave tool and measurement.


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory


This work was supported in part by the National Natural Science Foundation of China under Grant 61427803 and Grant 61271044, and in part by the Defense Industrial Technology Development Program under Grant JCKY2016601B005.

Keywords and Phrases

Impedance Matching; Miniature; Near-Field Measurement; U-Shaped Structure; Ultrawideband Probe

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Document Type

Article - Journal

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© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jun 2019