| Summary: | 碩士 === 明新科技大學 === 電子工程研究所 === 95 === Abstract
In this thesis, the printed rectangle slot antenna is designed by T-shaped microstrip-fed method. Otherwise, we discuss and analysis about the broadband characteristics. The printed rectangle slot antennas are all using microstrip-line-fed method that can let the printed rectangle slot antenna has the characteristic of simple structure. Additionally, in order to increase the bandwidth and gain of antenna, we design the Two-element and Four-element T-shaped microstrip-fed printed rectangle slot antennas dividedly; we test and verify the characteristics of high frequency and broad band for designed antennas by real practices.
In this thesis, we research the single T-shaped microstrip-fed printed rectangle slot antenna firstly. It is like to design a rectangle slot in the ground. Furthermore, we design a T-shaped microstrip-fed in patch and then combine each other by couple method. It can enable the proposed antenna have the bandwidth characteristic. The bandwidth of impedance can up to 51 percentages. In the next, we design the Two-element and Four-element T-shaped microstrip-fed printed rectangle slot antennas dividedly to achieve the goal of increasing bandwidth based on previous antenna structure. In the Two-element T-shaped microstrip-fed printed rectangle slot antenna, we try to design two sections for comparing different operation frequency at low frequency (790MHz~1.66GHz) and medium frequency(1.667GHz~ 2.957GHz).
The bandwidth of impedance is 64%(1.68~ 2.96GHz) on the part of Two-element T-shaped microstrip-fed printed rectangle slot antenna, but the Four-element is 55.5%(1.63~ 2.74GHz) that we can find the Four-element bandwidth of impedance is not increasing. However, the maximum gain of Two-element is 5.58dBi and the Four-element is up to 6.90dBi. At last, in order to improve the problem of the bandwidth of impedance for Four-element T-shaped microstrip-fed printed rectangle slot antenna, the Eight-element slot antenna was proposed. After design and real practice, the Eight-element slot antenna’s bandwidth of impedance is exalt to 90.8%(1.51~ 3.97GHz) and the gain is exalt to 9.43dBi.
For the previous results, we can find the proposed method of T-shaped microstrip-fed printed rectangle slot antenna is really have the characteristics of high-gain and bandwidth.
Keywords: microstrip array antenna, wide-band, high-gain.
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