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Complex near-field measurement using on-the-fly scan with in-phase and quadrature demodulation
Publikationstyp
Conference Paper
Date Issued
2024
Sprache
English
Start Page
181
End Page
184
Citation
GeMiC 2024 • March 11–13, 2024, Duisburg, Germany. - Piscataway, NJ, 2024. - Seite 181-184
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
IEEE
ISBN
978-3-9820397-3-2
Recently, a new near-field measurement technique based on on-the-fly (OTF) scanning and a Hilbert transform (HT) was proposed, allowing for rapid phase retrieval using a single probe. However, because of the required Nyquist rate sampling, this method encounters challenges related to costly data acquisition, storage, and processing demands, thereby restricting its use at MHz and GHz frequencies. In this paper a novel method is proposed, which addresses these issues by introducing in-phase and quadrature (IQ) demodulation in place of the HT. Its inherent frequency down conversion of the measured signal enables sampling at a significantly lower rate. To demonstrate the effectiveness of the proposed method, it is employed in a near-field scanner to measure the magnetic fields of two distinct devices under test: a wireless power transmitter and a microstrip line, operating at 125 kHz and 1 GHz, respectively. Measurement results, compared to conventional field measurement approaches, show a good correlation, affirming the suitability of this fast and cost-effective solution for antennas, and RF systems.
Subjects
in-phase and quadrature demodulation
Near-field scanner
on-the-fly scan
phase measurement
single-probe
DDC Class
510: Mathematics
621: Applied Physics