This article develops a flat, miniaturized lens based on metamaterial for antenna gain improvement. The overall size of the lens is 1.9λ0 × 1.9λ0 × 0.05λ0. The distance between the metamaterial lens and the antenna is only about 0.4λ0. The prototype lens antenna is fabricated and the measured results are in agreement with the simulated results. It shows that the proposed lens provides significant gain enhancement by 2 to 3.5 dB between 1.3 and 1.45 GHz, which effectively demonstrate a high directivity, miniaturized, and compact metamaterial lens antenna.

A design method of metal coaxial resonator antenna (MCRA) is proposed in this article. According to this method, a broadband MCRA working in highorder modes is designed. The proposed antenna fuses two frequency bands of different high-order mode pairs, thus achieving 30% fractional bandwidth. The measured operating frequency band of the antenna is 2.95-4.1 GHz, in which the gain is more than 8.5 dBi. In addition, in order to improve the gain, a lowprofile dielectric lens (DL) is designed. With the DL loaded, the À10 dB S11 band shifts to 3.1-4.1 GHz, and the gain of is more than 11 dBi. A close agreement has been achieved between the measured and simulated results.

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