Research Overview
Our researches aim to elucidate how electromagnetic waves—specifically, microwaves, millimeter waves, and terahertz waves—propagate through various spaces and materials that surround us. We employ a range of electromagnetic field theoretical analyses and experimental approaches to achieve this objective.
In more detail, we investigate the impact of various obstacles like rain, dense fog, clouds, and walls on the propagation of electromagnetic waves. We also study how these waves are affected as they traverse complex structures such as underground passages, winding hallways, indoor spaces, and urban landscapes. Understanding these aspects has promising implications for satellite communication, high-precision topographical observations during natural disasters, the construction of efficient mobile networks, and visualization technologies for obscure locations.
Specifically, we are ardently engaged in the development of waveguides and antennas, which are crucial for the advancement of radio astronomy observations and novel visualization technologies like terahertz remote sensing.
Research Topics
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Electromagnetic Wave Propagation Analysis
- Proposal and experimental verification of analytical methods for understanding electromagnetic phenomena within complex structures like buildings and subterranean spaces.
- Analytical Methods: CIP Method, FVTD Method, FDTD Method
- Analytical Models: Lossy dielectric materials such as concrete
- Experimental Verification: Using microwave scale models
- Identification and mitigation of radio interference issues in long-distance RFID applications.
- Proposal and experimental verification of analytical methods for understanding electromagnetic phenomena within complex structures like buildings and subterranean spaces.
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Development of High-Performance Antennas
- Development of high-performance feed horns for submillimeter wave telescopes.
- Measuring antenna characteristics using submillimeter wave network analyzers.
- Development of RFID antennas that allow reading from all directions.
- Features of Proposed Antenna: Planar structure, omnidirectional radiation, wide frequency range, excellent return loss characteristics, and circular polarization.
- Patent Pending: Various
- Development of high-performance feed horns for submillimeter wave telescopes.
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Other Topics
- Estimation methods for soil moisture content
- Proposals for analytical methods based on coupled-mode theory for multi-layer microstrip lines
- Extensions to analytical methods based on coupled-mode theory for anisotropic multi-conductor line systems
- Terahertz wave imaging and sensing
Exhibitions
- Innovation Japan - University Fair: "RFID Antennas Enabling Reading from All Directions"
- Microwave Exhibition (2008–2012)
Research Funding
- Various Grants
- Leader for Young Researcher (A) grant on "Antenna Technology to Solve Frustration During Radio Transmission and Reception in Mobile Devices", 2009-2012.
- Leader for Young Researcher (B) grant on "Development of High-Performance Submillimeter Wave Antennas and Evaluation Methods", 2004-2006.
- And more.
- Contracted Research (Government Agencies)
- Ministry of Internal Affairs and Communications: "Clarification and Improvement of Radio Interference During Long-Distance RFID Usage", 2009-2010.
- Collaborative Research (Public Institutions)
- Various projects from 2000-2007.
- Collaborative Research (Private Companies)
- Various projects from 2003-2007.