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Seven-element hexagonal arrays based on two- and four-arm spiral elements are introduced and analyzed in frequency and time domains. Full-wave modeling based on CST Microwave Studio verifies that these arrays can work over 4:1 bandwidth with VSWR<2.1:1, side lobe level (SLL)< −10dB, broadside axial ratio < 2 dB over the most operating bandwidth, appealing scanning capability over wide scan...
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