In recent year, wireless communications systems require transmission of higher and higher data rates to foster various multimedia services. The multiple-input multiple-output (MIMO) antennas system has been studied to increase wireless channel capacity and reliability. The mutual coupling of MIMO antennas affects the capacity of the wireless channel. Traditionally, the minimal mutual coupling distance between antenna elements needs to be at least one half wavelength. When MIMO antenna system is used in miniature mobile device, the problem of mutual coupling becomes even more serious.
In the first part of this thesis we propose a WLAN/WiMAX antenna that can be operated in 2.4 GHz (2.4¡V2.48 GHz) WLAN band; 2.5 GHz (2.5¡V2.7 GHz) and 3.5 GHz (3.4¡V3.7 GHz) WiMAX band. We use the inverted U slot band notch and omega slot band notch to reduce the mutual coupling in MIMO antennas. Our design is able to reduce the mutual coupling to be less than ¡V20 dB in all interested bands. In the second part, we propose a planar WLAN/WiMAX antenna that can be operated in 2.4 GHz (2.4¡V2.48 GHz), 5.2/5.8GHz (5.15-5.35GHz/5.725-5.825GHz) WLAN band; 2.5 GHz (2.5¡V2.7 GHz), 3.5 GHz (3.4¡V3.7 GHz) and 5.5 GHz (5.25-5.85 GHz) WiMAX band and mutual coupling of MIMO antenna is less than ¡V20 dB in all interested bands.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0201108-140630 |
| Date | 01 February 2008 |
| Creators | Huang, Chun-Chieh |
| Contributors | Chih-Wen Kuo, Ken-Huang Lin, Tzyy-Sheng Horng, Hsin-Lung Su, Yu-De Lin |
| 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-0201108-140630 |
| Rights | not_available, Copyright information available at source archive |
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