| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 107 === Design of dual band uni-direction and high directivity antenna is presented in the thesis. The proposed antenna is consist of the uni-direction high directivity log-periodic dipole array (LPDA) and Yagi antenna. Both are constructed with series dipole elements by PS (parallel strip), and then the 50 Ω parallel strip as the antenna feed. The proposed LPDA antenna element dose not be adopt by cross feed. The traditional printed log periodic dipole antenna array is fed on the shortest dipole position. The proposed LPDA antenna, on the other hand, can be fed on the longest dipole positon by modified antenna arrangement. Then it is connected with Yagi antenna.
The presented antenna is designed with the dielectric substrate of FR4. The formulated frequency band is operated from 2.4 GHz to 2.484 GHz and 3.3 GHz to 5 GHz for dual band applications. The proposed antenna is constructed with the Yagi and the modified log-periodic dipole antenna. The bandwidth is measured from 2.39 GHz to 2.66 GHz in the low band and 2.94 GHz to 5.07 GHz in the high band. The front to back ratio upon to 15 dB at 2.45 GHz、3.5 GHz、4 GHz, and 4.5 GHz. The full-wave simulation software and circuit simulation software are HFSS and ADS, respectively.
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