期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 68, 期 6, 页码 4332-4343出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.2972625
关键词
Lenses; Encoding; Dielectrics; Polarization; Delays; Transmitting antennas; 3-D printing; beam shaping; coding polarizer; lens; millimeter-wave (mm-wave); pencil beam
资金
- National Science Foundation of China [61871189]
- Science Foundation of Guangdong Province [2019A1515011999]
- Fundamental Research Funds for the Central Universities [2018MS14]
- Beijing Municipal Natural Science Foundation [4202047]
- Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07X032]
This article presents a new linear-to-circular polarization conversion coding unit, on which two new kinds of beam-shaping lenses are proposed. First, under periodic boundary conditions, a linear-to-circular polarization conversion coding unit is introduced, which introduces the necessary phase delay by adjusting its geometrical parameters. The phase delay ranges from 0 degrees to 360 degrees and is discretized into 3 bit coding units corresponding to specific delays. Second, by properly arranging the coding units, a high-gain circularly polarized (CP) lens is proposed. The lens achieves linear-to-circular polarization conversion and beam collimation in the transmission mode simultaneously with a planar configuration, which is different from counterparts that place a lens atop of a polarizer. Furthermore, the coding units are used to form Wollaston-prism-like and Rochon-prism-like planar CP beam-shaping lenses, which split the beams with different polarizations into right- and left-handed components. These beams can be controlled independently. Prototypes working at 30 GHz band are designed, fabricated, and measured to verify the idea.
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