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- [19] Optical Implementation of Butler Matrix for Hardware-Efficient Multiuser Beamforming IEEE PHOTONICS JOURNAL, 2018, 10 (02):
- [20] 2.4 GHz DOA Finder using Modified Butler Matrix for 2x2 Array Antennas 2008 14TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, (APCC), VOLS 1 AND 2, 2008, : 377 - 381