Abstract
To release more flexibility for users to charge their portable devices, researchers have increasingly developed compact wireless power transfer (WPT) systems in recent years. Also, a dual-band WPT system is proposed to transfer power and signal simultaneously, enriching the system’s functionality. Moreover, a stacked metasurface has recently been proposed for a single band near-field WPT system. In this study, a novel multimode self-resonance-enhanced wideband metasurface is proposed for a robust dual-band WPT system, which significantly improves the performance of both bands. The size of the transmitter (Tx) and the receiver (Rx) are both 15 mm × 15 mm only. The proposed metasurface can improve efficiency from 0.04 up to 39% in the best case. The measured figure of merit (FoM) is 2.09 at 390 MHz and 2.16 at 770 MHz, respectively, in the balanced mode. Especially, the FoM can reach up to 4.34 in the lower mode. Compared to the previous state-of-the-art for similar applications, the WPT performance has significantly been improved.
Highlights
To release more flexibility for users to charge their portable devices, researchers have increasingly developed compact wireless power transfer (WPT) systems in recent years
When the implanted medical devices (IMDs)’s battery inside a patient’s body runs out, as a solution for avoiding the battery replacement surgery, a wireless power transfer (WPT) system has been proposed in recent years[1,5], which has a unique capacity of charging the devices from outside wirelessly
The employed metasurface was in a conventional 1D topology[5,13,15,16,17,18,19,20,21,22,25,26], and more area seems to be exposed to the human body, which potentially causes health problems
Summary
To release more flexibility for users to charge their portable devices, researchers have increasingly developed compact wireless power transfer (WPT) systems in recent years. To satisfy the need for these applications, the whole system must maintain adequate WPT efficiency at a long WPT distance by using the device compact enough to be implanted With this purpose, recently, an artificial left-hand material with the dielectric characteristic of near-zero or negative permeability[13] called metasurface has been widely used to improve the WPT efficiency[5,13,14,15,16,17,18,19,20,21,22,23] enlarge the bandwidth of rectifier5, beamforming[24,25] and empower the performance of the lateral m isalignment[15,25].
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