5G antenna array with wide-angle beam steering and dual linear polarizations
A 24-GHz CMOS Butler Matrix MMIC for multi-beam smart antenna systems
2.4 GHz DOA finder using modified butler matrix for 2×2 array antennas
60-GHz Two-Dimensionally Scanning Array Employing Wideband Planar Switched Beam Network
A Low-Cost 60-GHz Switched-Beam Patch Antenna Array With Butler Matrix Network
Survey of Beam Steering Techniques Available for Millimeter Wave Applications