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Simulated and measured far-field radiation patterns at 2 GHz, 4 GHz, 6 GHz and 8 GHz. (a) Feed antennas alone for boresight radiation. (b) Luneburg lens-antennas for boresight radiation. (c) Luneburg lens-antennas for 36° beam steering. (d) Luneburg lens-antennas for 72° beam steering.
