期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 12, 页码 11442-11453出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3209283
关键词
Chain Huygens' metasurface; induced magnetism; low profile; metalens
资金
- National Natural Science Foundation of China [62071133]
- Key Program of the Natural Science Foundation of Guangxi Province [2019GXNSFDA245011, 2021GXNSFDA220003]
- Ministry of Education, Singapore [R-263-000-E86-112]
This study proposes an ultrathin and low-profile metalens antenna based on chain Huygens' metasurface for applications in the 28 GHz band. By utilizing the properties of the chain metasurface, such as full transmission phase coverage and stable angular performance, the metalens antenna achieves excellent radiated performances, including high gain and efficiency, as well as a wide gain bandwidth.
An ultrathin and low-profile metalens antenna based on chain Huygens' metasurface is proposed for 28 GHz band applications. The metasurface consists of an array series of modified dipoles etched onto a piece of the dielectric substrate, and there is a half-unit dislocation along the y-axis between these dipoles on top and bottom surfaces. Due to this geometry, the EM response between the pair of adjacent dislocated dipoles as a bridge links them into a whole structure, and thus, the metasurface is regarded as a chain structure. The chain metasurface has the characteristics of full transmission phase coverage, stable angular performance, and the subwavelengthscale EM manipulation ability (half the period of the unit along the y-axis, similar to 0.215 lambda(0) at 28 GHz, where lambda(0) is the wavelength in free space). By utilizing these properties of chain Huygens' metasurface, an ultrathin and low-profile metalens antenna operating at 28 GHz is designed with an aperture of about 15 lambda(0) x 15 lambda(0) and a smaller F/D ratio of 0.32 compared with the usual metalens antenna. The measurement shows that the proposed ultrathin metalens antenna achieves excellent radiated performances, including the peak gain of 30.6 dBi at 28 GHz, the antenna efficiency of 40.3%, and the 3 dB gain bandwidth of 10.7%.
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