4.6 Article

An Effective Design Formula for Single-Layer Printed Spiral Coils with the Maximum Quality Factor (Q-Factor) in the Megahertz Frequency Range

期刊

SENSORS
卷 22, 期 20, 页码 -

出版社

MDPI
DOI: 10.3390/s22207761

关键词

magnetic resonant wireless power transfer; quality factor (Q-factor); printed spiral coil; ohmic losses; volume filament model

资金

  1. National Research Council of Science and Technology (NST) - Korea government (MSIT) [CAP21051-100]
  2. KERI Primary research program of MSIT/NST [22A01054]
  3. National Research Council of Science & Technology (NST), Republic of Korea [CAP21051-100, 22A01054] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

This paper presents a formula for designing a printed spiral coil with the maximum quality factor. The formula includes the metal thickness, single pattern width, total pattern width, and turn number, and is effective in the megahertz frequency range. Using a volume filament model, the resistance, self-inductance, and Q-factor are calculated based on the ratio of pattern width, total pattern width, and turn number, and considering different metal thicknesses, frequencies, and total pattern widths. The results showed that the optimized coils have higher coupling efficiency compared to coils without optimal dimensions.
This paper presents a design formula for a printed spiral coil to ensure the maximum quality factor (Q-factor). The formula is composed of a pattern's metal thickness, single pattern width, total pattern width, and turn number, and is effective in the megahertz (MHz) frequency range. During the formula's design, the resistance, self-inductance, and Q-factor are calculated according to the ratio of each pattern's width and total pattern width and the turn number for different metal thicknesses, frequencies, and total pattern widths using a volume filament model (VFM). With a given turn number and metal thickness, the optimal ratio of individual and total pattern widths can be determined to ensure the maximum Q-factor. To verify the formula, some optimal coils were fabricated, and the calculations and measurements were shown to have good agreement. Furthermore, the optimized coils were shown to have higher coupling efficiency than the coils without optimal dimensions.

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