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Takahashi Lab
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A lab that receives information from the body via radio waves and sends power into the body.
AboutAbout the lab
Radio waves that watch over, radio waves that deliver.
The lab studies antennas and wireless systems for medical and wireless communication use.
It studies a system in which a fabric antenna attached to a patient gown serves as the transmitter, continuously monitoring the patient's vital signs.
It also works on technology to wirelessly transmit power from outside the body to a capsule endoscope inside it.
Recently, the lab has also been advancing a system that uses microwaves to detect pressure ulcers, as well as underwater position estimation using electromagnetic waves.
Key terms
- RFID
- A small tag that is read by radio waves. Battery-free types are powered by the radio waves from the reader.
- Wireless power transfer
- Technology that sends power to a distant device using radio waves or similar means, without a wired connection.
- MIMO
- Technology that speeds up wireless communication by using multiple antennas at the same time.
NewsLab news
A doctoral student received the 2025 IEEE AP-S Japan Student Award
A master's student received the Student Poster Award at AWAP2025
A master's student received the 2024 IEEE AP-S Japan Student Encouragement Award
A master's student received the Best Student Paper Award at MJWRT2024
ResearchResearch themes
While studying how the human body interacts with electromagnetic waves, the lab researches antennas and wireless systems for medical and wireless communication use. Its topics include fabric antennas attached to patient gowns, wireless power transfer into the body, and RFID-based detection of IV line removal and monitoring of infant posture.
*Illustrative imageAntennas for vital-sign monitoring
To respond quickly to changes in a hospitalized patient's condition, vital signs must be measured continuously. At present, connecting cables and wearing transmitters place a heavy burden on patients, so the lab studies a system in which a fabric antenna attached to a patient gown serves as the transmitter.
*Illustrative imageWireless power for capsule endoscopes
Current capsule endoscopes rely solely on a built-in battery, which limits their resolution and the number of images they can take. Introducing harmful battery materials into the body is also undesirable, so the lab studies technology to send power wirelessly from outside the body to the capsule inside it.
*Illustrative imageReducing coupling in MIMO antennas
When multiple antennas are placed in a small device such as a smartphone, they sit close together and mutual coupling between the elements occurs, lowering communication speed. The lab studies how to reduce this coupling while supporting carrier aggregation (CA), which uses multiple frequencies.
*Illustrative imageDetecting IV line removal with RFID
Patients pulling out their own IV lines is a common medical accident, and when it happens, prompt hemostasis and restarting of the infusion are required. Noting that the tape must be removed before the needle can be pulled out, the lab studies a system that uses RFID to determine whether the tape has come off the arm.
MembersFaculty
The lab's members are faculty and master's and undergraduate students.As of 2026
- Associate ProfessorMasaharu Takahashi
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: “Microwave Antenna ( )” Faisal Akram from Dhaka, Bangladesh / CC BY-SA 2.0 (cropped)
- Antennas for vital-sign monitoring: “Vital signs monitor display” Petty Officer 1st Class James Stenberg / Public domain (cropped)
- Wireless power for capsule endoscopes: “Wireless charging research ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Reducing coupling in MIMO antennas: “Cellular network antenna mount Haringey London” Acabashi / CC BY-SA 4.0 (cropped)
- Detecting IV line removal with RFID: “RFID tag in textile label disassembled” Boevaya mashina / CC BY-SA 4.0 (cropped)
- Related lab (医用生体電磁気学研究室
（齊藤研究室） ): “Metallic lens antenna Bell Labs 1946” 作者不詳 / Public domain (cropped) - Related lab (環境形成マネジメント
（林 立也） ): “Exterior Light Shelves - Green Office Building, Denver Colorado” USEPA Environmental-Protection-Agency / Public domain (cropped) - Related lab (通信・AI 信号処理教育研究分野): “136 to 174 MHz base station antennas” David Jordan on English Wikipedia / CC BY-SA 3.0 (cropped)
- Related lab (田中研究室): “Summer School Fluid Dynamics of Sustainability and the Environment ( )” École polytechnique - J.Barande (Ecole polytechnique Université Paris-Saclay Flickr account) / CC BY-SA 2.0 (cropped)
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