| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 93 === In the thesis, in ISM band the printed dipole array antenna is proposed. The printed dipole array antenna consists of one dipole array arranged back to back and can be easily formed by printing on both sides of a dielectric substrate. Based on the matching theory, which includes of a 50Ω microstrip feed line with open stub matched circuits is designed. Properties of the radiator as an array element have also been investigated.
The dipole antenna is a very simple antenna suitable for use when a nearly omnidirectional pattern is required. However, its gain is low. In many communication systems, one is interested in point-to-point communications, and a much more highly directive beam of radiation can be used to advantage. By arranging several dipoles into an array, a higher directive beam of radiation can be obtained. A more directive beam means that the antenna will also have a higher gain. In this thesis, the use of printed and doubled-sided dipole pair wideband antennas with parallel reflector in application of 2.4 GHz ISM band has been demonstrated.
It has been shown that dipole antenna array with high gain and broadband for VSWR 1.5 can be achieved. According to the measured results, The printed dipole array antenna achieves gain for 2.45GHz band to be about 3.5-4.5 dBi with 570MHz bandwidth and the reflector antenna has a gain of 5.3-7.0 dBi with a 310MHz bandwidth, respectively. The 8-element printed dipole array antenna without and with reflector have gain of 8.5-9.3 dBi with a 200MHz bandwidth and gain of 12-13 dBi with a 70MHz bandwidth, respectively. Both simulation and measured results are highly matched and verify our previous analysis.
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