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Kidera Lab
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A lab for electromagnetic sensing that uses microwaves and millimeter waves to image what cannot be seen.
AboutAbout the lab
Seeing the unseen with electromagnetic eyes.
The Kidera Lab studies sensing technologies that use electromagnetic waves (microwaves, millimeter waves, and terahertz waves) to examine the interior of objects and what lies behind obstacles.
These waves can penetrate to depths ranging from several tens of centimeters to a few millimeters, so they are said to enable measurement even where lasers or cameras cannot see.
The lab combines physical insight from analyzing electromagnetic scattering with data science such as signal and image analysis and machine learning.
The lab cites applications such as detecting people out of line of sight in autonomous driving, nondestructive measurement of roads and tunnels, and medical imaging diagnosis of cancer tissue using dielectric properties.
Key terms
- RPM method
- An imaging method developed by this lab that reconstructs the boundary of a target as a point cloud from range information alone.
- Complex permittivity
- A quantity describing how a material responds to electromagnetic waves, which differs greatly by type of target, such as concrete, cavities, or cancer tissue.
- Tomography
- A method that illuminates an object with electromagnetic waves from multiple directions and forms an image of its internal distribution from the scattered electric field.
- Nondestructive measurement
- Measurement that examines internal cavities, corrosion, and the like without damaging the target.
NewsLab news
A paper co-authored with a doctoral student has been accepted to IEEE OJAP
A paper co-authored with a master's student has been accepted to IEEE OJAP
A paper co-authored with a master's student has been accepted to IEEE JSTARS
A paper in IEEE Trans. on Antennas and Propagation was featured in a university news release
A paper co-authored with a master's student has been accepted to IEEE Sensors Journal
ResearchResearch themes
The lab studies sensing with microwaves, millimeter waves, and terahertz waves to capture the interior of objects and what lies behind obstacles, even in situations where optical sensors cannot see. By combining analysis of electromagnetic scattering with data science such as signal and image analysis and machine learning, it aims for technical breakthroughs in applications including autonomous driving, nondestructive measurement of transportation infrastructure, and cancer imaging diagnosis.
*Illustrative imageHigh-speed 3D image reconstruction beyond the wavelength limit
The lab's original RPM method specializes in extracting the boundary surfaces of targets and builds images from range information, raising processing speed thousands of times over conventional radar imaging techniques. It achieves imaging with a resolution of one-tenth of a wavelength and a positioning accuracy of one-hundredth of a wavelength.
*Illustrative imagePermittivity estimation combining radar and tomography
Radar images are used to narrow down regions of interest that contain cancer tissue or cavities. After the number of unknowns is reduced, inverse scattering analysis is performed to estimate the complex permittivity. While updating the region of interest, the lab determines both shape and permittivity with high accuracy.
MembersFaculty
The Kidera Lab's members consist of faculty, administrative assistants, affiliated faculty, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorShohei Kidera
- Project ProfessorTetsuro Kirimoto
- Associate ProfessorFang Shang
- Assistant ProfessorPeixian Zhu
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: “JGSDF AH-64D（74506） APG-78 Longbow millimeter-wave fire-control radar” Hunini / CC BY-SA 3.0 (cropped)
- High-speed 3D image reconstruction beyond the wavelength limit: “3D CT reconstruction of human lumbar spine and sacrum (anterior view) - Navi Mumbai” Goleisureintl / CC BY 4.0 (cropped)
- Permittivity estimation combining radar and tomography: “Dielectric-mirror780 1” Geek3 / CC BY-SA 4.0 (cropped)
- Related lab (Ishikawa Lab): “Monolithic microwave integrated circuit MSA0686 fixed” Appaloosa / CC BY-SA 3.0 (cropped)
- Related lab (Masamoto Lab): “Blood vessels-3D rendering” Antonino Paolo Di Giovanna / CC BY-SA 4.0 (cropped)
- Related lab (Kan Lab): “Metamaterial ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Tsuda Lab): “Himawari-8 true-color Z” Himawari 8 satellite operated by the Japan Meteorological Agency / CC BY 4.0 (cropped)
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