Broadband EC Models of Coil Antennas for Inductively Coupled Systems

Communication Quality Analysis for WPT and NFC Systems via Broadband Equivalent Circuit Models

“…The EC models of the coupled coils are based on our previous work and are given in Fig. 2 [11]. The chosen frequency range of interest is 0.1 MHz to 60 MHz.…”

“…The chosen frequency range of interest is 0.1 MHz to 60 MHz. We advanced a standard coil EC model (L n,r/t,i , R n,r/t,i , R p,n,r/t,1 , C p,n,r/t,1 ) [11], [17] for the coupled NFC coils while spreading the coupling capacitances C c over the inductance and DC resistance [11]. The WPT coil was modeled using a behavioral modeling The prototype is shown in a.)…”

“…approach [12] with parallel resonant circuits (L w,rx/tx,i , R w,rx/tx,i , R p,w,rx/tx,i , C p,w,rx/tx,i ) to align the EC model behavior with the measured prototype behavior [11]. In this specific case, the chosen frequency range and used WPT coils dictate the use of three resonant circuits for the WPT coil EC models [11], which in turn requires the NFC coil inductance to be split into three parts (i = 1, 2, 3, Fig. 2).…”

“…VNA measurements are required to determine S and Z parameters of the single coils and prototype [11]. Each coil was measured with no other coils in close proximity to determine the lumped elements for the single-coil EC models.…”

“…This broadband EC model allows the investigation of high-order WPT harmonics, contrary to narrowband EC models. In our previous work [11], we presented the basics of physical broadband EC models for two coupled NFC coils and a behavioral EC model for a WPT coil [12]. In this work, we further expand on this research and combine physical and behavioral coil EC models to generate a WPT and NFC systems prototype EC model.…”