Microwave Characteristics of CarbonNanocapsules and their Application to Radar Absorbing Structures
碩士 === 逢甲大學 === 航太與系統工程所 === 99 === Onion-like carbon nanocapsules with polyhedral carbon clusters are composed of multiple graphite layers. Carbon nanocapsules as well as C60 and carbon nanotubes are fullerene structures. The particle size of carbon nanocapsules is about 1~100 nm. Hollow carbon na...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/36458836223840653063 |
| Summary: | 碩士 === 逢甲大學 === 航太與系統工程所 === 99 === Onion-like carbon nanocapsules with polyhedral carbon clusters are composed of multiple graphite layers. Carbon nanocapsules as well as C60 and carbon nanotubes are fullerene structures. The particle size of carbon nanocapsules is about 1~100 nm. Hollow carbon nanocapsules and metal-filled nanocapsules possess specific optical, electrical and magnetic properties which make carbon nanocapsules an important cluster material for wide application. In this study, hollow carbon nanocapsules and iron-filled nanocapsules are added into epoxy to fabricate composite absorbers in different weight ratios. The complex permittivity and permeability and absorbing properties of the test samples are compared with carbon black and carbon nanotube absorbers in 2–18 GHz. The maximum absorption is –19.52 dB at 6.96 GHz for hollow carbon nanocapsule/epoxy absorber and –21.82 dB at 7.12 GHz for iron-filled nanocapsule/epoxy absorber with 3 mm thickness.
This study also uses carbon nanocapsules in the design of radar absorbing structures (RAS). With two frequency selective surfaces and two honeycomb layers in the RAS in which the lower honeycomb is coated with 15 wt% carbon nanocapsule/epoxy in 0.5 mm thickness, we can obtain wideband absorptivity greater than 10 dB in the frequency range of 3.7-18 GHz.
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