Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793158
K. Khvorostovsky, K. I. Yarusov, E. Zabolotskikh
The Weather Research and Forecasting (WRF) model simulations of several Polar lows observed in the Barents and Norwegian seas are evaluated using satellite data. The modeled surface wind speed (SWS) is compared to the SWS retrieved from the measurements of the Advanced Scatterometer (ASCAT) and Advanced Scanning Microwave Radiometer (AMSR-E). The ASCAT and AMSR-E data combined with the images of the Advanced Very-High-Resolution Radiometer (AVHRR) were used to validate the simulated PL trajectories. A series of numerical experiments using different model setup shown that although the reanalysis dataset used to obtain initial and boundary conditions and the initialization time of simulations are the major contributing factors for the model results, the choice of combination of the parameterization schemes may also significantly influence the simulated direction of the PL trajectory and SWS estimates.
{"title":"Evaluation of Model Simulations of Polar Lows with Satellite Data","authors":"K. Khvorostovsky, K. I. Yarusov, E. Zabolotskikh","doi":"10.1109/piers55526.2022.9793158","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793158","url":null,"abstract":"The Weather Research and Forecasting (WRF) model simulations of several Polar lows observed in the Barents and Norwegian seas are evaluated using satellite data. The modeled surface wind speed (SWS) is compared to the SWS retrieved from the measurements of the Advanced Scatterometer (ASCAT) and Advanced Scanning Microwave Radiometer (AMSR-E). The ASCAT and AMSR-E data combined with the images of the Advanced Very-High-Resolution Radiometer (AVHRR) were used to validate the simulated PL trajectories. A series of numerical experiments using different model setup shown that although the reanalysis dataset used to obtain initial and boundary conditions and the initialization time of simulations are the major contributing factors for the model results, the choice of combination of the parameterization schemes may also significantly influence the simulated direction of the PL trajectory and SWS estimates.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125272010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9792937
Wenhao Li, Rui Xi, Y. Ren, Xinyu Wu, Yihao Yang, J. Huangfu, Zuojia Wang, Hongsheng Chen
With the growing channel demand in the interactive communication system, vortex beam with multi directions is of vital importance for high-efficiency communication. A chiral coding metamirror constructed with optically transparent material is proposed here to generate vortex beams carrying different topological charges in different directions. Dispersionless phase diagram covering 360 degrees is achieved based on the theory of Pancharatnam-Berry phase. The proposed metamirror unit has circular dichroism (CD) with near-perfect spin-selective absorption across a wideband and is insensitive to incident angle. Multi vortex beams can thus be selectively generated at the designated frequency, which avoid information interference. In addition, vortex beams with direction control are realized based on phase gradient mechanism.
{"title":"Vortex Beam with Direction Control Based on Coding Chiral Metamirrors","authors":"Wenhao Li, Rui Xi, Y. Ren, Xinyu Wu, Yihao Yang, J. Huangfu, Zuojia Wang, Hongsheng Chen","doi":"10.1109/piers55526.2022.9792937","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792937","url":null,"abstract":"With the growing channel demand in the interactive communication system, vortex beam with multi directions is of vital importance for high-efficiency communication. A chiral coding metamirror constructed with optically transparent material is proposed here to generate vortex beams carrying different topological charges in different directions. Dispersionless phase diagram covering 360 degrees is achieved based on the theory of Pancharatnam-Berry phase. The proposed metamirror unit has circular dichroism (CD) with near-perfect spin-selective absorption across a wideband and is insensitive to incident angle. Multi vortex beams can thus be selectively generated at the designated frequency, which avoid information interference. In addition, vortex beams with direction control are realized based on phase gradient mechanism.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124020517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9792776
Daofan Wang, T. Fu, Ziquan Zhou
Terahertz (THz) waves commonly refer to the electromagnetic (EM) waves between millimeter microwaves and infrared waves. Among the three main ways of generating THz waves, vacuum electronics, especially Smith-Purcell radiation (SPR), have been considered as a popular way due to their unsubstitutability to produce relatively high emission power. SPR is a kind of electromagnetic wave radiation that happens when an energetic beam of electrons passes very closely parallel to the surface of a ruled optical diffraction grating. The frequency of radiation waves changes in the upper and lower space of the grating for different electron velocity, satisfying the SPR relationship. In this study, a Fano resonance metasurface was proposed to steer the direction of the SPR waves at the fixed resonant frequency by changing the velocity of the electric beam without varying the geometric parameters or adding extra coupling structure. The maximum emission power always locates at the resonant frequency by utilizing the integration of the Poynting vector. The absolute efficiency is normalized by the kinetic energy of the electrons. There is a great consistence of steering radiation angle about 40 degrees by altering the velocity of electron beam from 0. 6c to 0. 95c both in theoretical analysis and effective surface current simulation, where c is the speed of light in vacuum. Our study indicates that the proposed structure can produce direction-tunable THz radiation waves at resonant frequency by varying the velocity of the electric beam, which is promising for various applications in compact, tunable, high power millimeter wave and THz wave radiation sources.
{"title":"Dual-electron-beams Steering Direction Tunable THz Radiation Waves at a Fixed Frequency","authors":"Daofan Wang, T. Fu, Ziquan Zhou","doi":"10.1109/piers55526.2022.9792776","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792776","url":null,"abstract":"Terahertz (THz) waves commonly refer to the electromagnetic (EM) waves between millimeter microwaves and infrared waves. Among the three main ways of generating THz waves, vacuum electronics, especially Smith-Purcell radiation (SPR), have been considered as a popular way due to their unsubstitutability to produce relatively high emission power. SPR is a kind of electromagnetic wave radiation that happens when an energetic beam of electrons passes very closely parallel to the surface of a ruled optical diffraction grating. The frequency of radiation waves changes in the upper and lower space of the grating for different electron velocity, satisfying the SPR relationship. In this study, a Fano resonance metasurface was proposed to steer the direction of the SPR waves at the fixed resonant frequency by changing the velocity of the electric beam without varying the geometric parameters or adding extra coupling structure. The maximum emission power always locates at the resonant frequency by utilizing the integration of the Poynting vector. The absolute efficiency is normalized by the kinetic energy of the electrons. There is a great consistence of steering radiation angle about 40 degrees by altering the velocity of electron beam from 0. 6c to 0. 95c both in theoretical analysis and effective surface current simulation, where c is the speed of light in vacuum. Our study indicates that the proposed structure can produce direction-tunable THz radiation waves at resonant frequency by varying the velocity of the electric beam, which is promising for various applications in compact, tunable, high power millimeter wave and THz wave radiation sources.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126823762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9792763
Maxim A. Dubovitskiy, M. S. Mikhailov
In the theory of synthesis of MIMO antenna arrays for mm-Wave and THz applications, methods based on some a priori assumptions either about the amplitude-phase distribution over the length of the array are often used. Also the spatial location with the subsequent solution of the optimization problem is a common task in the conformal antennas design. In this paper, we analyze the possibilities of synthesizing a non-uniformly spaced array equivalent to a uniform one with a given amplitude-phase distribution. We synthesized the arrangement of elementary emitters with a known radiation pattern for the optimal antenna array by the criterion of sidelobe level suspension using two modifications of the particle swarm method and a genetic algorithm. This is implemented using evolutionary programming-real valued genetic algorithm (GA) and particle swarm optimization algorithm (PSO) under some constraints, minimizing the maximum side-lobe level of the planar array. It is shown that the proposed method can significantly reduce the pattern distortion as well as the side-lobe level. The obtained numerical results are compared with each other. The Best-Weights for 18 elements array are listed. The radiation patterns are presented for different number of elements.
{"title":"Non-periodic and Conformal Antenna Arrays Design Using Parallel Evolutionary Algorithm Based on GA and PSO","authors":"Maxim A. Dubovitskiy, M. S. Mikhailov","doi":"10.1109/piers55526.2022.9792763","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792763","url":null,"abstract":"In the theory of synthesis of MIMO antenna arrays for mm-Wave and THz applications, methods based on some a priori assumptions either about the amplitude-phase distribution over the length of the array are often used. Also the spatial location with the subsequent solution of the optimization problem is a common task in the conformal antennas design. In this paper, we analyze the possibilities of synthesizing a non-uniformly spaced array equivalent to a uniform one with a given amplitude-phase distribution. We synthesized the arrangement of elementary emitters with a known radiation pattern for the optimal antenna array by the criterion of sidelobe level suspension using two modifications of the particle swarm method and a genetic algorithm. This is implemented using evolutionary programming-real valued genetic algorithm (GA) and particle swarm optimization algorithm (PSO) under some constraints, minimizing the maximum side-lobe level of the planar array. It is shown that the proposed method can significantly reduce the pattern distortion as well as the side-lobe level. The obtained numerical results are compared with each other. The Best-Weights for 18 elements array are listed. The radiation patterns are presented for different number of elements.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127660968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this article, we prove a new type of opto-mechanical microwave metasurface with reflected and controllable beam through theory and simulation. The unit structure of the metasurface prepares an ELC metal resonance ring on a flexible medium FPC, and air is filled between the flexible medium FPC and the metal back plate at the bottom. Through the independent design of the cantilever arm and the air gap of each unit, the non-linear response characteristics of each unit in the metasurface are different under the excitation of electromagnetic waves of different intensities. It is based on the generalized Snell’s law to realize the abnormal deflection of the reflected beam.This research paper briefly analyzes the geometry and working mechanism of opto-mechanical metamaterials. Furthermore, the size of the cantilever arm corresponding to each unit structure is designed. Compared with the traditional nonlinear metasurface and its reconfigurable metasurface, the goal of this design is to achieve more flexible and reconfigurable functions. In addition, the electromagnetic response characteristics of each unit in the metasurface are independently controlled. Our findings will enrich the research field of nonlinear controllable metasurface technology on the coupling mechanism of electromagnetic energy and structural potential energy, which may lead to many interesting applications, such as beam scanning reflector antennas, planar devices with adjustable focal length and so on.
{"title":"Numerical Demonstrations of Beam Reconfigurable Reflective-type Opto-mechanical Metasurface","authors":"Yifeng Liu, Yuedan Zhou, Wenxian Zheng, Xueming Wei, Jian Li, Yongjun Huang, G. Wen","doi":"10.1109/piers55526.2022.9793200","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793200","url":null,"abstract":"In this article, we prove a new type of opto-mechanical microwave metasurface with reflected and controllable beam through theory and simulation. The unit structure of the metasurface prepares an ELC metal resonance ring on a flexible medium FPC, and air is filled between the flexible medium FPC and the metal back plate at the bottom. Through the independent design of the cantilever arm and the air gap of each unit, the non-linear response characteristics of each unit in the metasurface are different under the excitation of electromagnetic waves of different intensities. It is based on the generalized Snell’s law to realize the abnormal deflection of the reflected beam.This research paper briefly analyzes the geometry and working mechanism of opto-mechanical metamaterials. Furthermore, the size of the cantilever arm corresponding to each unit structure is designed. Compared with the traditional nonlinear metasurface and its reconfigurable metasurface, the goal of this design is to achieve more flexible and reconfigurable functions. In addition, the electromagnetic response characteristics of each unit in the metasurface are independently controlled. Our findings will enrich the research field of nonlinear controllable metasurface technology on the coupling mechanism of electromagnetic energy and structural potential energy, which may lead to many interesting applications, such as beam scanning reflector antennas, planar devices with adjustable focal length and so on.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114892841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9792803
Longlong Yang, Wenxin Liu, Yue Ou, Zhengyuan Zhao
Extended Interaction Klystron (EIK) is a high power, high efficiency and high gain vacuum electronic device (VED) based on high power klystron, which uses extended interaction cavity technology to achieve high power, high efficiency and high gain in millimeter wave and terahertz wave band. In this paper, the G-band high-power EIK high-frequency interaction circuit is designed and optimized, and the PIC three-dimensional particle simulation software is used to simulate it. The calculation results show that the terahertz power output with electronic efficiency of more than 6% and peak power of more than 278 W is obtained when the operating voltage is 18.4 kV, the beam current is 0.25 A and the center frequency is 234.2 GHz. The -3 dB bandwidth is more than 250 MHz and the gain is more than 34 dB. This work is of great significance to the development of high-power terahertz EIK and its application in national defense, satellite, high-resolution radar and other fields.
{"title":"Investigation of G-band Extended Interaction Klystron Broadband Beam-wave Interaction","authors":"Longlong Yang, Wenxin Liu, Yue Ou, Zhengyuan Zhao","doi":"10.1109/piers55526.2022.9792803","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792803","url":null,"abstract":"Extended Interaction Klystron (EIK) is a high power, high efficiency and high gain vacuum electronic device (VED) based on high power klystron, which uses extended interaction cavity technology to achieve high power, high efficiency and high gain in millimeter wave and terahertz wave band. In this paper, the G-band high-power EIK high-frequency interaction circuit is designed and optimized, and the PIC three-dimensional particle simulation software is used to simulate it. The calculation results show that the terahertz power output with electronic efficiency of more than 6% and peak power of more than 278 W is obtained when the operating voltage is 18.4 kV, the beam current is 0.25 A and the center frequency is 234.2 GHz. The -3 dB bandwidth is more than 250 MHz and the gain is more than 34 dB. This work is of great significance to the development of high-power terahertz EIK and its application in national defense, satellite, high-resolution radar and other fields.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116698047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793226
Huafei Wang, Xianpeng Wang, Mengxing Huang, Xiang Lan, Liangtian Wan
In the field of array signal parameter estimation, the research on direction-of-arrival estimation (DOA) by using the sparse Bayesian learning (SBL) technique has always been a very important aspect. Most of the existing SBL-based methods are not consider the temporal correlation between snapshots, which is not consistent with the real environment. Hence, the block sparse Bayesian learning (Block-SBL) has recently received a lot of attention. To enhance the robustness of the traditional Block-SBL based method to mutual coupling (MC), a robust Block-SBL method is proposed to achieve off-grid DOA estimation for temporally correlated source in this paper. Firstly, in the proposed method, a linear transformation is conducted based on the banded complex symmetric Toeplitz structure of the mutual coupling matrix (MCM) to eliminate the influence of MC between the array elements. Then, in order to improve the estimation performance, the signal subspace fitting (SSF) technique is introduced to construct an equivalent signal model, which is realized by eigenvalue decomposition of the received signal covariance matrix. Based on the constructed equivalent signal model, the SBL process is finally utilized to estimate parameters. In the process of the estimation of parameters, the equivalent signal variance is estimation by expectation maximization (EM) method and the off-grid error is reduced by the dynamic updating of spatial discrete grid points, which is realized by finding the roots of a polynomial. The simulation results demonstrate that the proposed method is more robust to the off-grid error and array mutual coupling, and can provide better DOA estimation performance than the traditional SBL and Block-SBL method.
{"title":"Off-grid DOA Estimation for Temporally Correlated Source via Robust Block-SBL in Mutual Coupling","authors":"Huafei Wang, Xianpeng Wang, Mengxing Huang, Xiang Lan, Liangtian Wan","doi":"10.1109/piers55526.2022.9793226","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793226","url":null,"abstract":"In the field of array signal parameter estimation, the research on direction-of-arrival estimation (DOA) by using the sparse Bayesian learning (SBL) technique has always been a very important aspect. Most of the existing SBL-based methods are not consider the temporal correlation between snapshots, which is not consistent with the real environment. Hence, the block sparse Bayesian learning (Block-SBL) has recently received a lot of attention. To enhance the robustness of the traditional Block-SBL based method to mutual coupling (MC), a robust Block-SBL method is proposed to achieve off-grid DOA estimation for temporally correlated source in this paper. Firstly, in the proposed method, a linear transformation is conducted based on the banded complex symmetric Toeplitz structure of the mutual coupling matrix (MCM) to eliminate the influence of MC between the array elements. Then, in order to improve the estimation performance, the signal subspace fitting (SSF) technique is introduced to construct an equivalent signal model, which is realized by eigenvalue decomposition of the received signal covariance matrix. Based on the constructed equivalent signal model, the SBL process is finally utilized to estimate parameters. In the process of the estimation of parameters, the equivalent signal variance is estimation by expectation maximization (EM) method and the off-grid error is reduced by the dynamic updating of spatial discrete grid points, which is realized by finding the roots of a polynomial. The simulation results demonstrate that the proposed method is more robust to the off-grid error and array mutual coupling, and can provide better DOA estimation performance than the traditional SBL and Block-SBL method.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116954428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793239
Fan Ding, Chen Zhao, Ze-zong Chen, Min Deng
Recently, using bistatic high-frequency (HF) radars to monitor the ocean surface attracts much attention. However, only a few works which focus on the extraction of ocean wave information are reported. In this work, a new method for the extraction of the ocean wavenumber spectrum is proposed. This new method assumes that the directional distribution of the ocean waves is known, and then it linearizes and simplifies the theoretical model of the bistatic radar sea echoes. In addition, the proposed method is applied to the simulated sea echo data and the result indicates that the method is effective.
{"title":"Inversion of Ocean Wavenumber Spectrum from the Bistatic High-frequency Radar Sea Echoes","authors":"Fan Ding, Chen Zhao, Ze-zong Chen, Min Deng","doi":"10.1109/piers55526.2022.9793239","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793239","url":null,"abstract":"Recently, using bistatic high-frequency (HF) radars to monitor the ocean surface attracts much attention. However, only a few works which focus on the extraction of ocean wave information are reported. In this work, a new method for the extraction of the ocean wavenumber spectrum is proposed. This new method assumes that the directional distribution of the ocean waves is known, and then it linearizes and simplifies the theoretical model of the bistatic radar sea echoes. In addition, the proposed method is applied to the simulated sea echo data and the result indicates that the method is effective.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131069672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793184
Yufang Wang, Y. Ge, Z. Chen
This paper proposes a kind of broadband metasurfaces that can independently and finely control the amplitudes and phases with a high efficiency for both reflection and transmission modes. A Fabry-Perot (FP) cavity and a metallic dual-split ring (DSR) polarizer are combined to construct each element of the metasuface that has an ultrathin and planar structure. The forward cross-polarization transmission and backward co-polarization reflection can be switched easily by varying the DSR polarizer. It can offer the arbitrary combination of amplitudes within [0, 1] and phases within the range of [0, 360°] for both transmission and reflection modes. The proposed metasurface was applied to design high-gain low-sidelobe transmitarray antenna (TA) and reflectarray antenna (RA). Comparisons between metasurfaces based on the phase control only and those based on the control of both phase and amplitude are studied. Numerical simulation results verify the described superior performance.
{"title":"A Broadband High-efficiency Multifunctional Ultrathin Metasurfaces","authors":"Yufang Wang, Y. Ge, Z. Chen","doi":"10.1109/piers55526.2022.9793184","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793184","url":null,"abstract":"This paper proposes a kind of broadband metasurfaces that can independently and finely control the amplitudes and phases with a high efficiency for both reflection and transmission modes. A Fabry-Perot (FP) cavity and a metallic dual-split ring (DSR) polarizer are combined to construct each element of the metasuface that has an ultrathin and planar structure. The forward cross-polarization transmission and backward co-polarization reflection can be switched easily by varying the DSR polarizer. It can offer the arbitrary combination of amplitudes within [0, 1] and phases within the range of [0, 360°] for both transmission and reflection modes. The proposed metasurface was applied to design high-gain low-sidelobe transmitarray antenna (TA) and reflectarray antenna (RA). Comparisons between metasurfaces based on the phase control only and those based on the control of both phase and amplitude are studied. Numerical simulation results verify the described superior performance.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132474614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9792949
Guang-Hua Sun, H. Wong
In this paper, we propose a wideband and high-gain planar antenna array for millimeter-wave applications. In this array, the slot radiator with a C-shaped and open structure is used as the antenna element. Due to the travelling-wave radiation of the open slot, the slot radiator can produce a wideband radiation and have an impedance bandwidth of 40% with the |S11| below –10dB from 21.6 GHz to 32.6 GHz. The gain of the proposed antenna element is up to 12.5 dBi owning to its large radiation aperture formed by two C-shaped open slot. Based on this wideband and high-gain antenna element, we design an 8 × 8 antenna array with a 1-to-64 SIW full-corporate feed network. The proposed array is fabricated in a two-layer substrate using standard printed circuit board (PCB) technology. The measured results show that the proposed antenna array has an impedance bandwidth of 37% from 21.4 to 31GHz. The measured gain of the proposed array is from 26.3 to 28.4 dBi over the operating bandwidth, with an average radiation efficiency of 70%. With wide bandwidth and the high directive gain, the proposed antenna array is a good candidate for long-distance millimeter-wave communications.
{"title":"A Wideband C-shaped Open Slot Array for Millimeter-wave Applications","authors":"Guang-Hua Sun, H. Wong","doi":"10.1109/piers55526.2022.9792949","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792949","url":null,"abstract":"In this paper, we propose a wideband and high-gain planar antenna array for millimeter-wave applications. In this array, the slot radiator with a C-shaped and open structure is used as the antenna element. Due to the travelling-wave radiation of the open slot, the slot radiator can produce a wideband radiation and have an impedance bandwidth of 40% with the |S11| below –10dB from 21.6 GHz to 32.6 GHz. The gain of the proposed antenna element is up to 12.5 dBi owning to its large radiation aperture formed by two C-shaped open slot. Based on this wideband and high-gain antenna element, we design an 8 × 8 antenna array with a 1-to-64 SIW full-corporate feed network. The proposed array is fabricated in a two-layer substrate using standard printed circuit board (PCB) technology. The measured results show that the proposed antenna array has an impedance bandwidth of 37% from 21.4 to 31GHz. The measured gain of the proposed array is from 26.3 to 28.4 dBi over the operating bandwidth, with an average radiation efficiency of 70%. With wide bandwidth and the high directive gain, the proposed antenna array is a good candidate for long-distance millimeter-wave communications.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132566818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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