In this dissertation, different from the conventional PIFA structure, the novel internal loop and slot antennas suitable for multiband mobile phone application are proposed. The loop antennas here use the technique of meandering the loop pattern to control the frequency ratio of the three resonant loop modes, and then the multiband operation can be obtained. For the slot antenna, different from the conventional slot antenna operating in a half-wavelength, the monopole slots antenna operating in it¡¦s quarter-wavelength mode are proposed. By properly adjusting the position of the monopole slot and the tuning stub of the microstrip feedline, the monopole slot antenna can achieve the multiband operation with a small occupied area in the mobile phone. In addition, the user¡¦s hand and head effects on the loop antenna are also studied. The obtained results indicate that, when the user¡¦s hand and head is close to or cover a certain portion of the antenna, large decrease in the antenna¡¦s radiation efficiency and great distortion in the antenna¡¦s radiation pattern will occur for all the three excited resonant modes of the loop antenna, no matter the unbalanced or balanced modes. Further, the efficiency drops caused by the user¡¦s hand and head over the GSM900 band are much larger than that over the GSM1800/1900 bands.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0429108-151444 |
| Date | 29 April 2008 |
| Creators | Lin, Chun-I |
| Contributors | W. Sh. Chen, J. S. Kuo, K. L. Wong, S. Y. Lin, W. S. Chen, F. S. Chang, Y. T. Cheng, K. C. Chao, H. M. Chen |
| 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-0429108-151444 |
| Rights | not_available, Copyright information available at source archive |
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