Ultra Video Converter Free Download Full Version With Key
Nichol Sadlon
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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.
Metasurfaces (MSs) are two-dimensional (2D) planar surfaces constructed by artificially periodic or quasi-periodic structures with sub-wavelength scales1,2,3,4,5,6, which overcome the physical limitations imposed by natural materials and provide exceptional capabilities for manipulating electromagnetic (EM) waves magnitudes7,8, phases9,10,11, polarizations12,13, propagation directions14,15,16 and shapes17,18. Recently, polarization conversion was one of the most interesting fields of MSs. There are two major research interests on the polarization conversion MSs. One is to realize almost arbitrary polarizations from one specific state to another. Linear-to-linear19,20, linear-to-circular21,22 and circular-to-circular23 polarization converters were presented, which provided flexible control of polarizations. The second research interest is to broaden polarization conversion bandwidth. Structure optimization24, topology optimization25 and multiple layers cascading26 were demonstrated to be effective bandwidth broadening methods. However, the present bandwidth broadening methods were mostly toward high-frequency range. The ultra-wideband polarization conversion MS, which covers low-frequency band, is rarely reported.
In this paper, we present a double-layer complementary MS with ultra-wideband polarization conversion bandwidth. Then, we propose two application cases by applying 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 form double-layer MS. The complementary anisotropic patterns are printed on both sides of the dielectric substrate. The polarization conversion bandwidth is broadened toward low-frequency range for the introduction of air substrate. Thus, ultra-wideband polarization conversion bandwidth is achieved. Subsequently, according to different mechanism of scattering suppression, the polarization conversion structures are used to construct uniform and orthogonal arrangement configurations. Referring to previous loading methods38,39,40,41,42, the configurations could be readily integrated into ACPA. The loaded configurations are optimized to obtain better impedance matching and radiation performance. The two MS-based ACPAs possess radiation enhancement and scattering suppression simultaneously. The measured results demonstrate the validity of our design methods.
Fig. 1(a) presents the schematic illustration of proposed double-layer polarization conversion MS illuminated by x-polarized EM waves. The MS converts polarization state to its orthogonal counterpart in an ultra-wide frequency range. Fig. 1(b) gives the 3D schematic structure of a unit cell. Metallic ground plane on the bottom surface is installed to guarantee absolute reflection. Air substrate and dielectric substrate are used to form double-layer structure. The dielectric substrate is on the above. The thicknesses of them are t1 and t2, respectively. Polytef slab (FR4) is adopted as dielectric substrate. The relative permittivity is 2.65 and dielectric loss is 0.002. Modified I-shaped patch and its orthogonal complementary slot are printed on the top and bottom surfaces of dielectric substrate, respectively. All parameters of the unit structures are optimized to obtain desired characteristics.
An ultra-wideband polarization conversion MS and its two application cases are proposed and demonstrated. Considering the application on ACPA, air substrate and dielectric substrate are utilized to design this double-layer polarization conversion MS. And the polarization conversion bandwidth is broadened toward low-frequency range. Subsequently, the polarization conversion structures are used to construct uniform and orthogonal arrangement configurations based on different mechanism of scattering suppression. Two kinds of configurations are readily integrated into ACPA with coplanar loading method and MS-based antennas are formed. The wide operation band is preserved well and boresight gain is enhanced over the whole operation band. Meanwhile, the scattering of antennas is suppressed in an ultra-wide frequency range. The proposed MS-based ACPAs possess radiation enhancement and scattering suppression simultaneously. The contradiction between radiation and scattering is addressed well. The results demonstrate that we provide novel approach to design high-performance polarization conversion MS and MS-based devices.
The polarization conversion MS and the MS-based antennas are simulated in commercial software Ansoft HFSS. The unit cell with master-slave periodic boundaries and floquet port is used to mimic the periodically arranged polarization conversion MS. A plane wave under normal incidence is introduced to obtain scattering properties of MS-based antennas.
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