All-dielectric frequency selective surfaces based on dielectric resonators
| Autor: | Yerong Zhang, Hao Wu, Huamei Zhang, Zheng-Bin Wang, Zhi-Hang Wu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Resonance Metamaterial 020206 networking & telecommunications 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Electromagnetic radiation Selective surface Resonator Dipole Wavelength Optics 0202 electrical engineering electronic engineering information engineering 0210 nano-technology business |
| Zdroj: | 2016 Progress in Electromagnetic Research Symposium (PIERS). |
| Popis: | Frequency selective surfaces (FSSs) are planar structures composed of a periodic array of unit cells that filter electromagnetic (EM) waves impinging on the surfaces. They have been widely used in stealth technology, electromagnetic countermeasure, and communication systems [1, 2]. Typical FSSs are composed of metallic grids or dipole arrays, which exploit the strong interactions between EM waves and metals. However, metals are problematic at very high incident power. Strong currents in the conductors will incur severe heating due to ohmic losses; arcing will occur at field concentration points [3]. Besides, metal materials are not quite favorable for high-temperature resistance and corrosion-resistant requirements. Consider that dielectrics exhibit a much weaker interaction with the field than metals do, all-dielectric FSSs (ADFSSs) make better alternative. Recently, J. H. Barton et al. [4] developed an ADFSS based on guided-mode resonance (GMR), which extended the fractional bandwidth of conventional GMR devices from 1% to 16%, and could survive with no damage at a high pulsed microwave power of 1.7GW/m2. In 2015, they presented another novel ADFSS using genetic algorithms and fast Fourier transforms [5], which exhibited a larger fractional bandwidth. Both of the designs have a total height about λ 0 /3 (λ 0 is the center wavelength of the operating EM waves). In optical region, subwavelength dielectric granules that possess strong Mie resonances are often used to fabricate metamaterials. Recently, a single-negative all-dielectric metamaterial, which is comprised of a single layer of cylindrical silicon resonators on a silicon-on-insulator substrate, is experimentally proved to possess broadband perfect reflection in the infrared region [6]. |
| Databáze: | OpenAIRE |
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