https://scholars.lib.ntu.edu.tw/handle/123456789/632510
標題: | Radiation Pattern Nulling in Phased Array Antennas Using Superior Discrete Fourier Transform and Dolph-Tschebyscheff Based Synthesis Techniques | 作者: | Panigrahi S HSI-TSENG CHOU Chang C.-Y. |
關鍵字: | adaptive nulling; antenna array; Discrete Fourier Transform; field basis function; pattern nulling | 公開日期: | 2022 | 卷: | 57 | 期: | 4 | 來源出版物: | Radio Science | 摘要: | This study proposes an improved method for sector nulling in the radiation pattern of rectangular phased array antennas using two different synthesis techniques; an orthogonal Discrete Fourier transform and a quasi-orthogonal Dolph-Tschebyscheff based technique. In traditional synthesis techniques, broad elemental beams serve as local field basis functions (FBFs) in an array. Instead, the proposed methods produce low sidelobe narrow beams as FBFs. A set of these FBFs can effectively constitute the array's radiation pattern in a confined angular region. By properly weighting these FBFs, sector pattern nulls in a designated angular range are synthesized without severely distorting the patterns outside this area. The FBFs' optimal weights can be efficiently calculated using a nonlinear minimum least squares error technique, which is later transformed into the array's elemental excitation coefficients. Along with faster convergence, this technique allows control over peak sidelobe level, null depth, and width, making it suitable for GPS anti-jamming, 5G communications, and other applications requiring interference suppression. © 2022. American Geophysical Union. All Rights Reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128779193&doi=10.1029%2f2021RS007342&partnerID=40&md5=0c5925c83dd5388b33e89b2355cba2e9 https://scholars.lib.ntu.edu.tw/handle/123456789/632510 |
ISSN: | 486604 | DOI: | 10.1029/2021RS007342 | SDG/關鍵字: | 5G mobile communication systems; Antenna lobes; Antenna phased arrays; Adaptive nulling; Base function; Field base function; Local fields; Low sidelobe; Narrow beams; Nulling; Pattern nulling; Phased array antennas; Synthesis techniques; Discrete Fourier transforms |
顯示於: | 電機工程學系 |
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