Abstract
Polarization has always been an important issue in modern communication systems, especially in sensitive measurements. Conventional polarization converters show limited applications due to their large size and narrow bandwidth. In this paper, we demonstrate an ultra-wide band, multifunctional, and highly efficient metamaterial-based polarization converter that is capable of converting a linearly polarized wave into its cross-polarized wave and circularly polarized wave over different frequency bands. The design principle is based on the field transformation theory and the anisotropic plate is made with high/low permittivity strip metamaterials. The simulation results show that the metamaterial-based polarization converter is able to achieve linear-to-linear conversion over 11.5–12.6 GHz, and linear-to-circular conversion over two frequency bands, 3.0–11.5 GHz and 12.6–17.0 GHz, with an average polarization conversion efficiency over 90%. The polarization converter proposed in this paper provides an important stepping stone for future communication systems’ polarization control and can also be extended to higher frequency bands.
Highlights
Electromagnetic waves play an important role in the field of modern communication engineering, and people are increasingly hoping to achieve perfect control of electromagnetic waves with devices such as polarization converters [1,2,3,4,5], lenses [6,7], and phase modulators [8,9,10]
By solving the parameter matrix, the coupling effect between the structural units is used to approximate the diagonal tensor in the parameter matrix, and achieve polarization conversion in the microwave region over an ultra-wide band through a dielectric strip metamaterial
Compared to other ultra-thin or broadband designs, the polarization converter proposed in this paper shows better performance in terms of device volume and operating bands, which makes it more convenient in communication system integration than other devices
Summary
Electromagnetic waves play an important role in the field of modern communication engineering, and people are increasingly hoping to achieve perfect control of electromagnetic waves with devices such as polarization converters [1,2,3,4,5], lenses [6,7], and phase modulators [8,9,10]. The field transformation theory is used to construct the constitutive parameter matrix required for polarization conversion. By solving the parameter matrix, the coupling effect between the structural units is used to approximate the diagonal tensor in the parameter matrix, and achieve polarization conversion in the microwave region over an ultra-wide band through a dielectric strip metamaterial. The field transformation matrix should be set-up based on the polarization conversion requirement. Based on frequency-independent research methods, the dielectric metamaterial constructed here can convert the incoming wave in the required space over an ultra-wide band. As the constitutive parameter matrix based on field transformation was diagonally symmetric, the coupling relationship between TE polarization (along x axis) and TM polarization (along y axis) was enhanced. Εx,y,z refers calculated that when the lowstrip, dielectric permittivityisstrip was air, the of required dielectric permittivity of to high the effective thewas x, y,about or z 50 direction
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