A Magnetic-Field Resonant Probe With Enhanced Sensitivity for RF Interference Applications

• Published in: IEEE transactions on electromagnetic compatibility Vol. 55; no. 6; pp. 991 - 998
• Main Authors: Hao-Hsiang Chuang, Guang-Hua Li, Eakhwan Song, Hyun-Ho Park, Hyun-Tae Jang, Hark-Byeong Park, Yao-Jiang Zhang, Pommerenke, David, Tzong-Lin Wu, Jun Fan
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.2013; Institute of Electrical and Electronics Engineers
• Subjects: Cross-disciplinary physics: materials science; rheology; Deformation; material flow; Effects of electric and magnetic fields; Enhanced sensitivity; Exact sciences and technology; Generation of magnetic fields; magnets; Impedance; Impedance matching; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Laser-induced magnetic fields in plasmas; Laser-plasma interactions; Magnetic components, instruments and techniques; Magnetic resonance; magnetic-field resonant probe; Magnetometers for magnetic field measurements; Marchand balun; Microstrip; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Probes; receiver desensitization; RF interference; Rheology; Sensitivity; Circuit design; Baluns; magnetic-field resonant probe; LC circuit; Receivers; Resonant circuit; RF interference; Mobile handsets; receiver desensitization; Radiofrequency interference; Noise level; Enhanced sensitivity; Marchand balun; Sensitivity; Resonance frequency; High field; Signal converter; Magnetic fields; Comparative study; Equivalent circuits
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2013.2248011

High-sensitive field probes are highly desirable for radio-frequency (RF) interference studies, where ultralow noise levels are of interest. By incorporating an LC resonant circuit in a differential-loop probe, together with a Marchand balun, a magnetic-field probe with enhanced sensitivity is developed. Its equivalent circuit model and design methodology are established. The design is validated by measurements. The measured relative sensitivity in terms of |S 21 | of the proposed probe increases by approximately 8.63 dB at the resonant frequency of 1.575 GHz compared to that of a conventional design. The advantage of the proposed probe is validated through its application in the measurement of a microstrip trace and a real-world cell phone design.