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Design of compact high efficient WPT system utilizing half ring resonators (HRRs) DGS for short range applications

This paper presents a new design for high efficient and compact size wireless power transfer (WPT) systems. The proposed system is based on coupled resonators of defected ground structures (DGS). A half ring resonator defected ground structure (HRR-DGS) band-stop filter is designed and proposed, and when two HRRs-DGS are coupled back-to-back, it transfers to a band-pass filter leading to compact WPT system operating at 3.4 GHz. The measured efficiency of the proposed HRRs-DGS WPT system is 96.87 % at a separation of 12 mm filled with foam which is suitable for charging electronic devices and biomedical applications. The measured performance of the prototype system is in good agreement with the simulated one.