Abstract
A new concept of the coding phase gradient metasurface (CPGM) is proposed, which is constructed using the phase gradient metasurface as the coding elements. Different from the previous coding metasurface (CM), both the coding sequences and gradient phases in the coding elements are designed to manipulate the electromagnetic (EM) wave for the CPGMs, and thus the manipulation will be more flexible. As an example, wide-band, wide-angle CPGMs with zero and non-zero phase gradient based on Pancharatnam-Berry (PB) phase are achieved using the co-polarization reflection unit cells under circularly polarized (CP) wave incidence. Both theoretically calculated and numerically simulated scattering patterns of the designed CPGMs demonstrate the expected manipulations. Additionally, two kinds of random CPGMs with different phase gradients are designed for radar cross section (RCS) reduction, and the measured RCS reveals a good accordance with the simulation.
Highlights
A new concept of the coding phase gradient metasurface (CPGM) is proposed, which is constructed using the phase gradient metasurface as the coding elements
We propose a concept of coding phase gradient metasurface (CPGM) with coding elements having a phase gradient
When it is illuminated by normally incident EM wave, the far-field function can be expressed as: College of Science, Air Force Engineering University, Xi,an 710051, People’s Republic of China
Summary
A new concept of the coding phase gradient metasurface (CPGM) is proposed, which is constructed using the phase gradient metasurface as the coding elements. Wide-band, wide-angle CPGMs with zero and non-zero phase gradient based on Pancharatnam-Berry (PB) phase are achieved using the co-polarization reflection unit cells under circularly polarized (CP) wave incidence. Both theoretically calculated and numerically simulated scattering patterns of the designed CPGMs demonstrate the expected manipulations. Compared with other CMs, the CPGM can manipulate EM wave by coding sequences and the phase gradient of coding elements To generate these CPGMs, we utilize the N-shaped element as the unit cell which has a co-polarization reflection characteristic under circularly polarized (CP) waves incidence[11]. Both theoretic analysis and numerical simulation indicate that our CPGMs have a more flexible capability of manipulating the EM wave
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