| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 88 === In this thesis, design simulation, fabrication, and experimental measurement of planar Ka-band (27-32 GHz) antipodal linearly-tapered slot antennas (ALTSAs) are presented. A single-element ALTSA and two-element ALTSA arrays with in-phase and out-of-phase arrangement are studied. The High Frequency Structure Simulator (HFSS) which based on the 3-D finite-element method (FEM) and IE3D (2-1/2D IE/MoM) simulator are employed for design simulation. The ALTSAs are fabricated on a RT/Duroid 5880 substrate. Good agreement between HFSS 3-D simulation and measurement on input VSWR (about 1.3 at 30GHz) and antenna directivity (about 14dBi at 30GHz) is achieved for the single-element ALTSA. For two-element ALTSA arrays, it is found that, although with narrower HPBW (or higher directive gain), the directivity of the in-phase two-element ALTSA array (about 13 dBi at 30 GHz) is smaller than that of the single-element ALTSA. It may be due to the larger dimension of the arrayed ALTSA which causes more substrate loss at Ka-band. Higher sidelobe level of the designed two-element ALTSA array may also degrade the directivity of the antenna main beam. Further study is needed for improvement. The designed ALTSA could be used for Ka-band communication systems, such as the local multipoint distribution system (LMDS).
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