Abstract
A double-layer complementary metasurface (MS) with ultra-wideband polarization conversion is presented. Then, we propose two application cases by applying the polarization conversion structures to aperture coupling patch antenna (ACPA). Due to the existence of air-filled gap of ACPA, air substrate and dielectric substrate are used to construct the double-layer MS. The polarization conversion bandwidth is broadened toward low-frequency range. Subsequently, two application cases of antenna are proposed and investigated. The simultaneous improvement of radiation and scattering performance of antenna is normally considered as a contradiction. Gratifyingly, the contradiction is addressed in these two application cases. According to different mechanism of scattering suppression (i.e., polarization conversion and phase cancellation), the polarization conversion structures are utilized to construct uniform and orthogonal arrangement configurations. And then, the configurations are integrated into ACPA and two different kinds of metasurface-based (MS-based) ACPA are formed. Radiation properties of the two MS-based ACPAs are improved by optimizing the uniform and orthogonal arrangement configurations. The measured results suggest that ultra-wideband polarization conversion properties of the MS are achieved and radiation enhancement and scattering suppression of the two MS-based ACPAs are obtained. These results demonstrate that we provide novel approach to design high-performance polarization conversion MS and MS-based devices.
Highlights
IntroductionMetasurfaces (MSs) are two-dimensional (2D) planar surfaces constructed by artificially periodic or quasi-periodic structures with sub-wavelength scales[1,2,3,4,5,6], which overcome the physical limitations imposed by natural materials and provide exceptional capabilities for manipulating electromagnetic (EM) waves magnitudes[7,8], phases[9,10,11], polarizations[12,13], propagation directions[14,15,16] and shapes[17,18]
The polarization conversion bandwidth is broadened toward low-frequency range for the introduction of air substrate
The polarization conversion structures are used to construct uniform and orthogonal arrangement configurations based on different mechanism of scattering suppression
Summary
Metasurfaces (MSs) are two-dimensional (2D) planar surfaces constructed by artificially periodic or quasi-periodic structures with sub-wavelength scales[1,2,3,4,5,6], which overcome the physical limitations imposed by natural materials and provide exceptional capabilities for manipulating electromagnetic (EM) waves magnitudes[7,8], phases[9,10,11], polarizations[12,13], propagation directions[14,15,16] and shapes[17,18]. The present bandwidth broadening methods were mostly toward high-frequency range. Except for converting the antenna polarizations, the polarization conversion structures were used to suppress antenna scattering. These polarization conversion structures were used to form orthogonal arrangement configurations and applied to patch antenna and slot array antenna directly[39,40]. Applying the polarization conversion structures to a wideband antenna and improve the radiation and scattering performance simultaneously is rarely presented in existing literatures. We present a double-layer complementary MS with ultra-wideband polarization conversion bandwidth. We propose two application cases by applying polarization conversion structures to aperture coupling patch antenna (ACPA). The polarization conversion bandwidth is broadened toward low-frequency range for the introduction of air substrate. The measured results demonstrate the validity of our design methods
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