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A 1 × 4 double-sided dipole antenna array with an associated Butler matrix beamforming network was designed and implemented at 60 GHz using glass-based integrated passive device (IPD) technology. Owing to the chip area limitation, the spacing between the antenna elements is ∼0.32λ0. Experimental results show that beams are successfully generated in the −62°, −23°, 22° and 50° directions, with total...
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