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A 2.45 GHz two-dimensional (2-D) 4×4 multi-beam phased array was designed, based on the Butler matrix beamforming technique. Sixteen beam states are produced by two stacks of 4-way Butler matrices, where one stack controls the vertical angle and the other one controls the horizontal angle. To achieve system compactness, the Butler matrix in grounded coplanar-waveguide (CPWG) configuration is newly...
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