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- W2600998225 abstract "The FD-TD method and the moment method are used to analyze a two-wire square spiral antenna backed by a conducting square cavity (SAC). The SAC is fed from a coaxial line without a balun circuit. First, the SAC is analyzed using the FD-TD method. The SAC design is based on radiation characteristics of a two-wire square spiral antenna backed by a conducting plane reflector (SAR). It is found that the frequency bandwidth for a 3-dB axial-ratio criterion is 12% (18% for SAR), with a gain of 7 dBi (8 dBi for SAR). Second, the moment method is used to analyze a wire-grid model of the SAC. Grid sizes appropriate for the analysis are determined on the basis of the FD-TD solutions. It is revealed that the grid size for the cavity side plates is 1.3 times larger than that for the cavity bottom plate. Third, a two-SAC array is analyzed to reveal the mutual coupling. Calculation shows that the decoupling factor is larger than that for a two-SAR array by approximately 3 dB. The computation time and memory size required for the analyses are compared between the two cases for the FD-TD and the moment methods. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(1): 53–63, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10211" @default.
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- W2600998225 date "2003-09-01" @default.
- W2600998225 modified "2023-09-23" @default.
- W2600998225 title "A cavity- backed spiral antenna with an unbalanced feed system --analyses using FD-TD and moment methods" @default.
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