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Muramatsu Lab
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A lab that clarifies the interaction between living bodies and electromagnetic waves and applies it to communications and medicine.
AboutAbout the lab
Applying the link between living bodies and electromagnetic waves to technology
The Muramatsu Lab studies the interaction between living bodies and electromagnetic waves and applies it to technologies in information and communications, medical healthcare, human interfaces, and other fields.
A living body is a dielectric with unusual electrical properties, and its intricate tissue structure, individual differences, and constantly changing physiological activity combine to interact with electromagnetic waves in complex ways.
The lab's research covers a wide range of areas, including human body communication that uses the body as a communication channel, wearable antennas, implantable medical devices, measurement of biosignals, and meat quality evaluation.
The lab's motto is "Curiosity Driven Research," and it welcomes enthusiastic people who want to open up interdisciplinary fields without being bound by existing frameworks.
Key terms
- Human body communication
- Communication that uses the human body itself as a transmission path for high-frequency signals. Signals are fed into and received from the body through electrodes.
- Wearable device
- A device that is worn on the body when used. Smartwatches are one example.
- Head-mounted device
- A device worn on the head when used. Examples include hearing aids and true wireless earphones with separate left and right units.
NewsLab news
A doctoral student received the Young Researcher Encouragement Award from the Communications Society of the Institute of Electronics, Information and Communication Engineers (IEICE)
A paper on a conductive embroidered logo antenna for wearable RFID tags was accepted by IEEE Access
A paper on a wearable antenna supporting dual physical layers was accepted by the Journal on Wireless Communications and Networking
A master's student received the Poster Session Encouragement Award at the IEICE Technical Committee on Healthcare and Medical Information Communication Technology
A paper on signal propagation in multi-user human body communication was accepted by AIP Advances
ResearchResearch themes
The lab aims to clarify the complex interaction between living bodies and electromagnetic waves and to apply it to technologies in information and communications, medical healthcare, human interfaces, and other fields. Its research is presented in four categories: information and communications, medical healthcare, human interfaces, and others.
*Illustrative imageHuman body communication that uses the body as a transmission path
This is a communication technology that uses the human body itself as a transmission path for high-frequency signals. Signals are fed into and received from the body through electrodes, and because the electric field is distributed only near the body, the communication is highly secure and consumes little power.
*Illustrative imageBattery-less human body communication
For wearable devices without batteries, the lab proposes two approaches: sending information and power at the same time from an installed device through the human body, and harvesting ambient electromagnetic waves with the body acting as an antenna to use as a power source.
*Illustrative imageCommunication between left and right separated devices using the head
For head-mounted devices such as binaural hearing aids, the lab proposes a human body communication system that uses the head as a transmission path so that communication between the left and right devices is not interrupted by the head blocking the signal. Key challenges include frequencies suited to the head, electrode structures, and ensuring safety.
*Illustrative imageClothing-based garment antennas
This research uses clothing itself as a small, lightweight antenna that can be placed close to the body, by decorating the surface of leather material with conductive material. The lab built a prototype self-complementary antenna and is examining the effects of bending, body size, and posture.
MembersFaculty
The Muramatsu Lab consists of faculty, technical support staff, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorDairoku Muramatsu
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Body Area Network” Jtel / Public domain (cropped)
- Human body communication that uses the body as a transmission path: “Wristband computer 01” Wikideas1 / CC0 (cropped)
- Battery-less human body communication: “Schematic diagram of a remote health monitoring system based on wearable sensors” Aaron Asael Smith, Rui Li, Zion Tsz Ho Tse / CC BY 4.0 (cropped)
- Communication between left and right separated devices using the head: “Earphones BW” Berthold Werner / CC BY-SA 3.0 (cropped)
- Clothing-based garment antennas: “Art meets conductive fabric ( )” Libraries Taskforce / CC BY 2.0 (cropped)
- Related lab (Ishibashi Lab): “LteMimoAntennen” BAZ Spezialantennen / CC BY 3.0 (cropped)
- Related lab (Li Lab): “RF Fully Anechoic Room 1” Mihaelawojcik / CC BY 4.0 (cropped)
- Related lab (Murakami Lab): “Z Antennas at UHF Frequencies” C. Holloway/NIST / Public domain (cropped)
- Related lab (Washizawa Lab): “EEG Experiment” Flexagoon / CC0 (cropped)
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