Details of Researches

Underwater Wireless Power transfer

Autonomous underwater vehicles are desired to charge battery and communicate information under water in order to improve operation efficiency. We have an ambitious goal of developing the wireless power and data transfer system for operation underwater, focusing on the capacitive coupling with a simple structure and low leakage of field. So as to require a high power charging in this case, we are also investigating an elucidation of high-frequency property in fresh water and seawater.

  1. M. Tamura, K. Murai, M. Matsumoto,gDesign of Conductive Coupler for Underwater Wireless Power and Data Transfer,h IEEE Trans. Microwave Theory and Techniques, vol. 69, no. 1, pp.1161-1175, Jan. 2021.
  2. M. Tamura, Y. Naka, K. Murai, T. Nakata,gDesign of a Capacitive Wireless Power Transfer System for Operation in Fresh Water,h IEEE Trans. Microwave Theory and Techniques, vol. 66, no. 12, pp.5873-5884, Dec. 2018.
  3. Y. Naka, K. Yamamoto, T. Nakata, M. Tamura, gImprovement in Efficiency of Underwater Wireless Power Transfer with Electric Coupling,h IEICE Trans. Electron, vol. E100-C, no. 10, pp.850-857, Oct. 2017.

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Demonstration in Underwater WPT @@@@@@ @@@@@@

Next-Generation Wireless RF Circuits

Various methods in order to achieve high-speed and large-capacity wireless communications are developed such as Massive-MIMO, In-band full-duplex, and OAM. We aim to develop the RF circuits that are key technologies to realize these methods. As we image the application to a wide target range from portable devices to base station in small cell, we are developing value-added solutions such as high tunability and high power capability corresponding to the targets.

  1. K. Yoshihara, M. Tamura, Y. Miyaji, A. Alphones, gDual Band SIW Cavity-Backed Crossed-Slot Antenna,h in Proc. 2019 Asia-Pacific Microwave Conference, Singapore, Dec. 2019, pp.1775-1778.
  2. K. Satoh, M. Tamura,gFilter using cylindrical quadruple mode SIW resonator,h IEICE Electronics Express, ELEX, vol.15, No.9, pp.1-6, #20180295, Apr. 2018.
  3. M. Tamura, S. Tomida, K. Ichinose,gDesign and Analysis of Multi-Mode Stripline Resonator and Its Application to Bandpass Filter,h IEICE Trans. Electron, vol. E101-C, no. 3, pp.151-160, Mar. 2018.

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Demosntration with Antenna for In-band full-duplex @@@@@@ @@@@@@

Wireless Harness

Numerous sensors are installed in various facilities and equipment for the purpose to support safe and secure life. In particular, power supply by wireless power transfer is expected for the sensors in dangerous places such as infrastructures in factory and power plant. We are developing a unique system with the pseudo-shielded space, which makes it possible to confine the electromagnetic field in the space and wirelessly transfer power to the sensor nodes in series.

  1. D. Fujii, M. Tamura,gDesign Method for Differential Rectifier Circuit Capable of Rapidly Charging Storage Capacitor,h IEICE Trans. Electronics, vol. E104-C, no. 7, pp.355-362, Jul. 2021.
  2. S. Nimura, D. Furusu, M. Tamura,gImprovement in Power Transmission Efficiency for Cavity Resonance-Enabled Wireless Power Transfer by Utilizing Probes With Variable Reactance,h IEEE Trans. Microwave Theory and Techniques, vol. 68, no. 7, pp.2734-2744, Jul. 2020.
  3. D. Furusu, M. Tamura,gDesign of Capacitive Planar Power Transmitter and Receiver for Cavity Resonance enabled Wireless Power Transfer,h IEEE Microwave and Wireless Components Letters, vol. 29, no. 8, pp.566-568, Aug. 2019.

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