Electromagnetic (EM) wave absorbers and shielding materials, which are electromagnetic environment countermeasures, are essential for the future development of information and communication technology. In this research, we are trying to design and evaluation of novel EM wave absorbers and shielding materials from low to high frequencies. Furthermore, we are developing EM wave transmission materials that allow EM waves in the desired frequency band to pass through.
We are conducting research into Electromagnetic Compatibility (EMC) countermeasure technologies to realize the latest information and communication technologies. To improve the electromagnetic (EM) environment worldwide, it is essential to develop EM environment countermeasure materials such as EM wave absorbers and shielding materials. In this research, we are trying to design and development of new EM wave absorbers and shielding materials that suppress undesired EM waves from microwave to millimeter-wave frequencies. Furthermore, to make effective use of EM waves, we are also developing EM wave transparent materials that allow EM waves in desired frequency bands to pass through.
With the rapid development of information and communication technology in recent years, the effective use of EM waves has become essential. As exemplified by 5G and automotive millimeter-wave radar, the frequency bands used by these technologies are shifting from low frequencies to high frequencies, including millimeter waves. However, despite the development of these technologies, problems such as EM interference between devices caused by undesired EM waves emitted from various electronic devices have become a problem. To address this problem, the use of EM environment countermeasure materials such as EM wave absorbers and shielding materials is extremely effective. In this research, in addition to conventional EM environment countermeasure materials, we are proposing various wave absorbers, shielding materials, and transmitting materials with added new functions such as matching frequency selectivity.
In this research, we propose a EM wave absorber that incorporates a simple artificial material into a part of a conventional EM wave absorber. As an example, we designed and prototyped an artificial material with a periodic arrangement of metal patterns approximately half the wavelength on the same plane. By combining this with a lossy material such as a ferrite-mixed rubber material or a low-loss material such as an acrylic plate, we have confirmed through both experiments and theoretical analysis that it can function as a EM wave absorber with matching frequency selection capabilities. We have also confirmed that the above artificial material can function as a frequency-selective EM shielding material. Furthermore, by appropriately combining an artificial material such as a wire grid with a low-loss material, we have confirmed that an EM wave-transmitting material (space filter) can be constructed, and that the total transmission frequency can be controlled.
This research is expected to contribute to the development of technologies that effectively utilize only specific frequency bands of EM waves, such as millimeter-wave radar for automobile collision prevention. Specifically, this technology is expected to be applicable to the following fields:
・Beyond 5G technology
・Applications to the medical field (e.g., EM environment countermeasures for medical institutions)
・Applications to autonomous driving technology
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