| Summary: | 碩士 === 國立中正大學 === 電機工程研究所 === 105 === In this thesis, the phased array antennas applicable to the fifth generation (5G) mobile systems are designed. Based on the 5G radio prototype implemented by Huawei, the operation frequency of the proposed phased array antennas is selected at sub-6GHz (i.e. 3.5 GHz). The bow-tie antenna is utilized as the antenna element constituting the 4×16 phased array antenna to enhance the beam directivity and increase the array gain required by 5G communication.
Through measuring the gain pattern of individual element composing the array, the beam-forming and beam-steering characteristic can then be synthesized by scanning element pattern measurement approach. The measurement results show the maximum array gain is 20 dBi. In addition, when the progressive phase shift between the adjacent antenna is adjusted from −160° to +160°, the corresponding beam directions can be scanned from +57° to −57° thus validating the beam-steering.
The other topic of this thesis is the design and implementation of printed-circuit board electromagnetic surfaces. The microstrip electromagnetic elements with delay lines possessing wide adjustable reflection phase range are utilized to improve the design flexibility of the electromagnetic surfaces. Based on the theory of the reflectarray, the phase distribution of elements can be acquired and the required reflection phase shift can be fulfilled by adjusting the physical delay lines thereby achieving the beam-forming capability. The characteristics of the electromagnetic surfaces are verified by full-wave electromagnetic simulator. Finally, to validate the practicality of the designed electromagnetic surfaces, several surfaces with different reflection angles are designed under two predetermined incident angles (30° and 60°). The measurement and simulation results show satisfactory agreement.
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