Title:	Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements
Authors:	Almtrod, Abdalghfor Abdalghfar A Kubík, Zdeněk
Citation:	ALMTROD, AAA. KUBÍK, Z. Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements. SENSORS, 2022, roč. 22, č. 19, s. 1-19. ISSN: 1424-8220
Issue Date:	2022
Publisher:	MDPI
Document type:	článek article
URI:	2-s2.0-85139919695 http://hdl.handle.net/11025/51046
ISSN:	1424-8220
Keywords in different language:	broadband;EMC;LC equivalent circuit;LGR magnetic probe;narrowband;PIN diode;varactor diode
Abstract in different language:	This paper presents a printed magnetic probe that can switch from broadband to tunable narrowband for near-field measurement. In the early design stage, we created a printed loop gap resonator as a magnetic reference sensor for the pre-compliance test in a band up to 6 GHz. Consequently, the results showed a good response in terms of the S11 and S21 parameters of the proposed probe compared with the commercial magnetic sensor XF-R 3-1. The source noise might spread among different frequency bands, making the broadband magnetic probe the closest choice for estimating the magnetic field in the near-field region. Unfortunately, broadband magnetic probes have lower sensitivity than narrowband ones. One of the solutions to get high sensitivity is to connect the LNA to the output of the passive magnetic sensor. This work proposes a novel method to solve this issue using a PIN diode to change the broadband status into a high sensitivity narrowband status and then tune this narrowband across the most critical applications such as 3.5 GHz, 3.75 GHz, 4.8 GHz, and 5.2 GHz with the help of a varactor diode. Compared to the broadband status, an improvement of more than 10 dB has been obtained across all these wireless bands. Furthermore, the proposed structure’s isolation between the electrical and magnetic fields is about 13 dB.
Rights:	© authors
Appears in Collections:	Články / Articles (KEI) OBD

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