Broadband, Sequentially-Rotated Slot Array with Beam-Switching Capability
Date Issued
2009
Date
2009
Author(s)
Wu, Hsiao-Wei
Abstract
For wideband operation, a circularly-polarized circular slot antenna fed by a microstrip line has been chosen in this thesis to form an array. The physical mechanism and the analysis of the operating mode of the antenna are discussed first. The circular slot antenna is then employed to form a linear array and a planar array to increase the antenna gains. In addition, to enhance the axial-ratio bandwidth of the planar antenna array, the sequential rotation technique is applied in the design of the feeding network for the array.he aforementioned linear and planar arrays are also designed to have beam-switching capability. In designing the switched-beam planar array, we proposed a simple method to predict the radiation pattern of the array. The feeding phases for those array elements are thus modified to produce a main beam in the specified direction. After verifying the beam-switching characteristics of the linear and the planar arrays, phase shifters are exploited to replace the delayed microstrip lines to attain the beam-switching capability. As a result, broadband, circular-polarized switched-beam slot antenna arrays, both linear and planar arrays, are proposed, implemented, and tested.
Subjects
broadband
circular polarization
phase shifters
sequential rotation
slot antennas
switched-beam antenna arrays
Type
thesis
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ntu-98-R96942070-1.pdf
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