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A K-band flat lens antenna with a slot-fed antenna feeder

This paper presents a novel design and demonstration of a linearly polarized lens antenna with planar antenna feeders. The lens consists of four identical metallic array printed on three identical dielectric slabs. The thickness is only 3 mm or 0.22 λ at the operating frequency, 22 GHz. To make the antenna structure compact, the planar small antenna feeder instead of a horn is investigated. Simulations and experiments have been conducted to validate the design. The measured results show that a 3-dB gain bandwidth of 15% and a peak gain of 25.1 dBi are achieved.