A Resonant E-field Probe for RFI Measurements


Near-field probes with high sensitivity facilitate the identification of the root causes of intrasystem radio frequency interference issues, where weak noise desensitizes the receiver. In the study presented in this paper, a high-sensitivity resonant electric field probe was designed, consisting of an LC resonator loaded by quarter-wave transformers for optimal power transfer at the resonant frequency. Based on the equivalent circuit model, analytical derivations and numerical simulations were performed to illustrate the design methodology. The simulation results agreed well with the measured values. At the resonant frequency of 1.577 GHz, the measured /S21/ from a matched trace to the resonant probe was approximately 6.6 dB higher than that of an equivalently sized broadband probe.


Electrical and Computer Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Second Research Center/Lab

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

Circuit simulation; Computer simulation; Electric fields; High frequency transformers; Natural frequencies; Power transformers; Radio frequency identification (RFID); Design Methodology; Enhanced sensitivity; Equivalent circuit model; Impedance transformers; Optimal power transfer; Quarter Wave Transformer; Radio frequency interference; RF interference; Probes; receiver desensitization

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 2014 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Dec 2014