碩士 / 國立交通大學 / 電信工程系所 / 97 / In this thesis, we presented a 4-way spatial beam splitter consisting of two-dimsnsional fishnet-based periodic structure. By properly designing the periods and aperture size of the fishnet, the periodic medium can possess a effective refractive index close to zero. Furthermore, from Snell’s law we know that the refractive wave outgoing from a medium with refractive index near zero will tend to be perpendicular to its interface connecting to a medium with refractive index greater than unity. Based on this principle, we put a line source in the metamaterial to excite the four beams normally radiating from the four sides of the rectangle-shaped metamaterial. To enhance the radiation directivity, each of the openning is equipped with a E-plane horn type structure. The major contribution of this theses contains twofolds: (1) the dispersion and phase relations of the two-dimensionally periodic structure was systematically calculated to explain the extraordinary propagating characteristics of waves in the metamaterial with near-zero effective refractive index, and (2) in addition to the theoretical calculation, the experimental measurements were carried out to verfy the theoretical studies. Last but not the lease, a good agreement between the theoretical and experimental results was obtained.
| Identifer | oai:union.ndltd.org:TW/097NCTU5435090 |
| Date | January 2009 |
| Creators | Hsu, Neng-Chieh, 許能傑 |
| Contributors | Hwang, Ruey-Bing, 黃瑞彬 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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