Millimeter-Wave Three-Layer Substrate-Integrated $9 \times 9$ Butler Matrix and Its Application to Wide-Angle Endfire Multibeam Metasurface Antenna
IEEE Transactions on Microwave Theory and Techniques（2024）
关键词
Endfire,millimeter-wave,multibeam metasurface antenna,9 $\times$ 9 Butler matrix (BM),substrate-integrated waveguide (SIW),wide-angle coverage
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