Masaya Tamura

Affiliation	Department of Electrical and Electronic Information Engineering
Title	Associate Professor
Fields of Research	Wireless power transfer / Microwave circuits / High frequency circuit
Degree	Doctor of Informatics (Kyoto Univ.)
Academic Societies	IEEE / IEICE
E-mail	tamura@ee Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL	http://www.comm.ee.tut.ac.jp/em/index.html
Researcher information URL（researchmap）	Researcher information

Research

Our daily lives are surrounded by electromagnetic wave. It includes not only radio wave utilized in the data transmission but also heat radiation from our body and sunlight. We are widely conducting basic & applied researches with the aim of social contribution using the electromagnetic field; Basic researches are wireless power transfer under water and development of the resonator with high quality factor used in RF filter. Applied research is realization of the two-way communication module that can work by wireless power transfer.

Theme1：Wireless Power Transfer under Water

Overview

Power station under seawater

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, Y. Naka, K. Murai, T. Nakata,“Design of a Capacitive Wireless Power Transfer System for Operation in Fresh Water,” IEEE Trans. Microwave Theory and Techniques, vol. 66, no. 12, pp.5873-5884, Dec. 2018.
[2] M. Tamura, Y. Naka, K. Murai,“Design of Capacitive Coupler in Underwater Wireless Power Transfer Focusing on kQ Product,” IEICE Trans. Electron, vol. E101-C, no. 10, pp.759-766, Oct. 2018.
[3] Y. Naka, K. Yamamoto, T. Nakata, M. Tamura, “Improvement in Efficiency of Underwater Wireless Power Transfer with Electric Coupling,” IEICE Trans. Electron, vol. E100-C, no. 10, pp.850-857, Oct. 2017.

Keywords

Underwater wireless power transfer, high power RF generator

Theme2：Next-Generation Wireless RF Circuits

Overview

Base station for next-generation network

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. Satoh, M. Tamura,“Filter using cylindrical quadruple mode SIW resonator,” IEICE Electronics Express, ELEX, vol.15, No.9, pp.1-6, #20180295, Apr. 2018.
[2] M. Tamura, S. Tomida, K. Ichinose,“Design and Analysis of Multi-Mode Stripline Resonator and Its Application to Bandpass Filter,” IEICE Trans. Electron, vol. E101-C, no. 3, pp.151-160, Mar. 2018.

Keywords

RF circuits, RF filter, Circuit design for signal processing

Theme3：Wireless Harness

Overview

Battery-less wireless sensor system

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 communicate with the sensors outside the space.

Keywords

Wireless power transfer, Battery-less sensor system, Wireless harness

Title of class

Electric Circuit 1 / Signal Processing / Microwave Circuits / Advanced Communication Systems 2