In this thesis, we described our efforts to achieve antenna radomes that enhance antenna gain by using the artificial synthesis structure of the left-handed material.
The characteristics of the metamaterial are introduced. Also, we will analyze the phenomena of the left-handed material which distinguish them from the right-handed material. Moreover, we analyze and derive the theory to obtain the effect of the meta-materials with the metal line artificial synthesis array structure. Then, we will focus on the method of lowering the frequency of the left-handed material structure and discuss the frequency influence of the permeability, permittivity, and refractive index as the modulus of the refractive index is smaller than one or negative. We will adjust the structure to allow a wider useful frequency bandwidth. In order to prevent from the reflection of the metal lines to cause too much loss, we will simplify the structure of the single unit. Making use of the above-mentioned methods, we use the material to achieve an antenna radome. The meta-material radome can reduce the 3 dB beam-width by about 30 percent compared with the conformal patch at 5.25 GHz. Finally, we design a novel structure of unit cell based on the CSRR which is provided with a broadband negative index of refraction. The relative bandwidth of the LHM proposed in this thesis is 36.5%. In order to reduce loss tangent we remove the dielectric substrate, which further reduce the 3 dB beam-width.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0724107-141708 |
| Date | 24 July 2007 |
| Creators | Lo, Chin-yung |
| Contributors | Chih-Wen Kuo, Ken-Huang Lin, Tzyy-Sheng Horng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724107-141708 |
| Rights | not_available, Copyright information available at source archive |
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