期刊
APPLIED PHYSICS LETTERS
卷 105, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4904466
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资金
- National Natural Science Foundation of China [61008031]
- Fundamental Research Funds for the Central Universities [HIT.NSRIF.2014020]
- Postdoctoral Science-Research Developmental Foundation of Heilongjiang Province [LBH-Q13078]
We demonstrate both theoretically and experimentally that the microwave-shielding effectiveness of a double-layer metallic mesh with a submillimeter period can be improved by increasing the separation between the two mesh layers (without affecting transmittance). This double-layer mesh consists of two layers of square aluminum mesh separated by a quartz-glass substrate. By increasing the substrate's optical thickness from zero to lambda/4 of the shielding band's upper frequency, the shielding of the double-layer mesh improves considerably, owing to the increased reflectivity of the double-layer mesh with increasing separation in the low-frequency band. A Ku-band shielding effectiveness of over 32 dB is observed for the double-layer mesh with a normalized visible transmittance greater than 91%. It is found that the electromagnetic shielding effectiveness is enhanced by over 7 dB (80.0% energy attenuation) across the Ku-band, compared with that of a single-layer mesh, while the optical transmittances are almost identical for both tested structures. Such an enhancement permits the design of high-transparency optical elements with stronger microwave shielding that can be achieved using single-layer metallic mesh. (C) 2014 AIP Publishing LLC.
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