Designs of Pattern Reconfigurable Magneto-electric Dipole Array for Base Station Applications

• Main Authors: Wang, Po-Kai, 王柏凱
• Other Authors: Row, Jeen-Sheen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/bsv7pz

碩士 === 國立彰化師範大學 === 電機工程學系 === 107 === Two pattern reconfigurable antenna arrays are proposed in this thesis. The radiating element of the two arrays is a printed dipole backed with a metallic box, and it has a broad impedance bandwidth as well as a high front-to-back ratio. For the first array, four of the elements are connected together by using a mounting fixture with rotatable joints. When the joints are rotated manually, the array configuration is changed, and each array configuration can generate a specific radiation pattern. A prototype designed at the 5 GHz WiFi band is constructed. Measured results for the prototype operating in three typical radiation modes are shown, including high directive radiation mode, two-beam radiation mode, and omnidirectional radiation mode. For the second array, it is composed of four identical subarrays, and each subarray is a compact sector array with four radiating elements. To obtain the required radiation patterns, the four subarrays are stacked in a sequential-rotation fashion. By controlling the number of the elements are excited, the array can provide scanned beams and an omnidirectional pattern in the frequency band from 3.3 to 4 GHz; besides, the scanned beams with three different half-power beamwidths can be obtained. Both measured and simulated results are also provided in the thesis.