In this paper, wireless power transfer based on resonant coupling with metamaterials is studied. We show with numerical studies that the coupling between transmitter and receiver can be enhanced, and the power transfer efficiency can be improved by metamaterials. A prototype wireless power transfer system and a metamaterial is designed and built. Experiment results prove the efficiency improvement with the fabricated metamaterial. The system with metamaterial is capable of transferring power wirelessly at roughly double the efficiency of the same system without a metamaterial. European Conference on Antennas and Propagation (EUCAP)This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract-In this paper, wireless power transfer based on resonant coupling with metamaterials is studied. We show with numerical studies that the coupling between transmitter and receiver can be enhanced, and the power transfer efficiency can be improved by metamaterials. A prototype wireless power transfer system and a metamaterial is designed and built. Experiment results prove the efficiency improvement with the fabricated metamaterial. The system with metamaterial is capable of transferring power wirelessly at roughly double the efficiency of the same system without a metamaterial.

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In this paper, a wireless power transfer system with magnetically coupled resonators is studied. The idea to use metamaterials to enhance the coupling coefficient and the transfer efficiency is proposed and analyzed. With numerical calculations of a system with and without metamaterials we show that the transfer efficiency can be improved with metamaterials. ICWITSThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. AbstractIn this paper, a wireless power transfer system with magnetically coupled resonators is studied. The idea to use metamaterials to enhance the coupling coefficient and the transfer efficiency is proposed and analyzed. With numerical calculations of a system with and without metamaterials, we show that the transfer efficiency can be improved with metamaterials.

We present a novel device structure applicable to various RF MEMS devices that consist of a dielectric membrane and metallized air cavity. RF MEMS device components are formed on the dielectric membrane, which is suspended above the metallized air cavity. The metallization of the bottom of the air cavity allows us to realize the ground plane. Moreover, by applying the air cavity, the influence of the substrate on the loss characteristics of the device can be minimized. In this paper, we also present a novel RF MEMS process module to realize our proposed device structure. By means of our RF MEMS process module, four RF passives could be successfully developed. The implementation of these passives could be achieved simultaneously on the same silicon substrate. Our fabricated passives are a grounded coplanar waveguide (GCPW), a 90° hybrid, an elliptic low pass filter (LPF) and an inductor. All of them are fabricated on a silicon nitride membrane suspended above the 30 µm deep metallized air cavity. They have been developed as components of a wireless communication transceiver module at 12 GHz. We performed characteristics measurement and obtained 2.03 dB and 2.18 dB as insertion losses, and 21.63 dB as the return loss for the 90° hybrid at 12 GHz. For the elliptic LPF and GCPW, we obtained the insertion losses at 12 GHz as 1.86 dB and 0.1 dB mm−1, respectively. The measurement results are also in agreement with the simulation results. Our proposed device structure and RF MEMS process module have the advantages in terms of loss characteristics, manufacturing cost and applicability.