| Summary: | 碩士 === 臺北城市科技大學 === 機電整合研究所 === 102 === In this thesis, there is great possibilities that the radiated structure of antenna can be shrunk about 50% area by using the image charge theorem. Compared with the full-patch antenna in this work, the patch area is only 57% for image semi-patch structure antenna. The impedance bandwidth of full-path antenna extends from 3.3GHz to 6.54GHz, or percentage bandwidth = 65%. The peak of antenna gain is about is 3.3dBi at 5.8GHz. On the one hand, the impedance bandwidth of semi-path antenna extends from 3.12GHz to 6.92GHz, or percentage bandwidth = 75%. The peak of gain is only 2.7dBi at 6.2GHz. From the results above, the small size semi-patch antenna radiate similar frequency band to the full-patch one. It implies that the semi-patch antenna can substitution for full-patch one in spite of antenna gain.
Semi-patch structure can also be designed in ultra-wideband antenna. The bandwidth of our ultra-wideband antenna with semi-patch structure is from 2.42GHz to 12.4 GHz, or percentage of bandwidth = 130.4% , covering the use of ultra-wideband antenna range.
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