Applicable visualization strategies are required to achieve quick inspection and interpretation of polarimetric synthetic aperture radar (PolSAR) images. However, the visual effect of PolSAR images may be susceptible to the possibly existent large dynamic range of PolSAR data. In this paper, a simplified method for adjusting the large dynamic range of PolSAR data is developed, which is similar to the “MinMaxContrastMedian” technique adopted by Pottier et al. in their visualization strategy within the PolSARpro software. Based on this simplified method and the red-green-blue color model, a novel color visualization strategy for three-component model-based polarimetric decomposition is further proposed. The feasibility and validity of the proposed strategy is verified by the measured PolSAR data of Oberpfaffenhofen obtained by DLR L-band E-SAR.
{"title":"On the Color Visualization of Three-component Model-based Decomposition for Polarimetric SAR Data","authors":"Xun Wang, Dong Li, Yunhua Zhang, Jiefang Yang, Liting Liang","doi":"10.1109/PIERS55526.2022.9792977","DOIUrl":"https://doi.org/10.1109/PIERS55526.2022.9792977","url":null,"abstract":"Applicable visualization strategies are required to achieve quick inspection and interpretation of polarimetric synthetic aperture radar (PolSAR) images. However, the visual effect of PolSAR images may be susceptible to the possibly existent large dynamic range of PolSAR data. In this paper, a simplified method for adjusting the large dynamic range of PolSAR data is developed, which is similar to the “MinMaxContrastMedian” technique adopted by Pottier et al. in their visualization strategy within the PolSARpro software. Based on this simplified method and the red-green-blue color model, a novel color visualization strategy for three-component model-based polarimetric decomposition is further proposed. The feasibility and validity of the proposed strategy is verified by the measured PolSAR data of Oberpfaffenhofen obtained by DLR L-band E-SAR.","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":"122334664","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/piers55526.2022.9792953
Minmin Huang, Shuanggen Jin, Xueqin Gao
Flood disaster is one of the natural disasters with the highest frequency in the Yangtze River, which caused immeasurable losses, particularly catastrophic floods in the Yangtze River Basin during July and August 2020. Nowadays, Synthetic aperture radar (SAR) imagery can monitor and evaluate floods in any weather conditions. In this paper, the spatial-temporal variations of the 2020 catastrophic flood are investigated and evaluated from Sentinel-1 date and Otsu thresholding method in the two perspectives of area disparity and flood duration. Four severe flood sections of the Yangtze River (Yueyang, Hankou, Jiujiang, Chizhou) are taken as study objects. Yueyang and Hankou sections are in the middle reach and the Jiujiang and Chizhou section are in the lower section. The results show that the average water body area in 2020 was 20.40% larger than that in 2019 in four sections of the Yangtze River. The upper sections are suffered more from floods for a longer time. The water area of four sections shows a highly positive correlation with the water level, which is the highest in Jiujiang Section, even to 0.9924. The four sections are affected by the flood events in 2020 with the order as follows: Yueyang section > Jiujiang section > Hankou section > Chizhou section.
{"title":"Mapping and Evaluation of the 2020 Catastrophic Floods in the Yangtze River Basin Using Sentinel-1 Imagery","authors":"Minmin Huang, Shuanggen Jin, Xueqin Gao","doi":"10.1109/piers55526.2022.9792953","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792953","url":null,"abstract":"Flood disaster is one of the natural disasters with the highest frequency in the Yangtze River, which caused immeasurable losses, particularly catastrophic floods in the Yangtze River Basin during July and August 2020. Nowadays, Synthetic aperture radar (SAR) imagery can monitor and evaluate floods in any weather conditions. In this paper, the spatial-temporal variations of the 2020 catastrophic flood are investigated and evaluated from Sentinel-1 date and Otsu thresholding method in the two perspectives of area disparity and flood duration. Four severe flood sections of the Yangtze River (Yueyang, Hankou, Jiujiang, Chizhou) are taken as study objects. Yueyang and Hankou sections are in the middle reach and the Jiujiang and Chizhou section are in the lower section. The results show that the average water body area in 2020 was 20.40% larger than that in 2019 in four sections of the Yangtze River. The upper sections are suffered more from floods for a longer time. The water area of four sections shows a highly positive correlation with the water level, which is the highest in Jiujiang Section, even to 0.9924. The four sections are affected by the flood events in 2020 with the order as follows: Yueyang section > Jiujiang section > Hankou section > Chizhou section.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"43 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":"125965138","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}
Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793162
Xiaolei Yuan, M. Gou, Zeng Yang, Ming-lin Yang, X. Sheng
In this paper, we present solutions of scattering from inhomogeneous objects with honeycomb structures using a homogenization based fast computation method. In this method, the effective permittivity and permeability of the cellular materials are first derived with the HS theory which are expressed as diagonal tensors. Then the Euler angels are introduced to describe the orientation of a honeycomb structure, transforming the diagonal tensors into a general 3$times $3 tensors. At last, the homogenized honeycombs together with other structures are integrated and computed using the nonconformal domain decomposition hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA). Numerical examples are given to demonstrate the accuracy, capability and performance of the proposed algorithm, including the scattering by typical sandwich panels with honeycomb cores.
{"title":"Homogenization Based Fast Computation of Electromagnetic Scattering by Inhomogeneous Objects with Honeycomb Structures","authors":"Xiaolei Yuan, M. Gou, Zeng Yang, Ming-lin Yang, X. Sheng","doi":"10.1109/piers55526.2022.9793162","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793162","url":null,"abstract":"In this paper, we present solutions of scattering from inhomogeneous objects with honeycomb structures using a homogenization based fast computation method. In this method, the effective permittivity and permeability of the cellular materials are first derived with the HS theory which are expressed as diagonal tensors. Then the Euler angels are introduced to describe the orientation of a honeycomb structure, transforming the diagonal tensors into a general 3$times $3 tensors. At last, the homogenized honeycombs together with other structures are integrated and computed using the nonconformal domain decomposition hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA). Numerical examples are given to demonstrate the accuracy, capability and performance of the proposed algorithm, including the scattering by typical sandwich panels with honeycomb cores.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"897 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114059090","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/piers55526.2022.9792972
Baoqing Huang, G. Cheng
In this paper, it presents a UWB MIMO antenna with three band-notched properties. The antenna consists of two monopole antennas. It sculptured three U-shaped slots to achieve three stop band characteristics. Slotted the floor to further raise the degree of isolation between antenna units. It has a compact size of 50 mm * 35mm * 1.6 mm. Results show that this antenna meets a 20 dB isolation from 3.3 to 11 GHz, with three notched band at 3.5 GHz, 5.5 GHz and 7.5 GHz. This antenna is simulated by HFSS.
{"title":"UWB-MIMO Antenna with Band-notched Structure","authors":"Baoqing Huang, G. Cheng","doi":"10.1109/piers55526.2022.9792972","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792972","url":null,"abstract":"In this paper, it presents a UWB MIMO antenna with three band-notched properties. The antenna consists of two monopole antennas. It sculptured three U-shaped slots to achieve three stop band characteristics. Slotted the floor to further raise the degree of isolation between antenna units. It has a compact size of 50 mm * 35mm * 1.6 mm. Results show that this antenna meets a 20 dB isolation from 3.3 to 11 GHz, with three notched band at 3.5 GHz, 5.5 GHz and 7.5 GHz. This antenna is simulated by HFSS.","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":"122760360","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/piers55526.2022.9792593
Fangzheng Ji, Zhixin Wang, Liyin Nie, Zhaoneng Jiang
A probe-fed broadband vertically polarized metasurface antenna with omnidirectional radiation is presented in this paper. The omnidirectional antenna combined with the metasurface can well make up for the shortcomings of the traditional microstrip antenna with a high Q value and a narrow frequency band. The profile of the antenna is very low due to its single-layer structure. The antenna is composed of 16 square patches with twelve outer patches slightly smaller than the inner ones. In order to improve impedance matching, a small circular patch is added to the center of the antenna to offset the inductivity introduced by the feeding probe. The overall size of the antenna is 55mm $times55$ mm $times4$ mm. The simulation results show that the bandwidth of the proposed metasurface antenna is as high as 52.3% (5.57–9.51 GHz) with maximum gain of 6.5 dB.
{"title":"A Metasurface Omnidirectional Antenna Design Using CMA","authors":"Fangzheng Ji, Zhixin Wang, Liyin Nie, Zhaoneng Jiang","doi":"10.1109/piers55526.2022.9792593","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792593","url":null,"abstract":"A probe-fed broadband vertically polarized metasurface antenna with omnidirectional radiation is presented in this paper. The omnidirectional antenna combined with the metasurface can well make up for the shortcomings of the traditional microstrip antenna with a high Q value and a narrow frequency band. The profile of the antenna is very low due to its single-layer structure. The antenna is composed of 16 square patches with twelve outer patches slightly smaller than the inner ones. In order to improve impedance matching, a small circular patch is added to the center of the antenna to offset the inductivity introduced by the feeding probe. The overall size of the antenna is 55mm $times55$ mm $times4$ mm. The simulation results show that the bandwidth of the proposed metasurface antenna is as high as 52.3% (5.57–9.51 GHz) with maximum gain of 6.5 dB.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"57 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":"123926663","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/piers55526.2022.9792869
A. N. Bogolyubov, Z. Dombrovskaya, A. D. Nikitchenko
We perform quantitative estimations of lifetime and energy transfer coefficient for the Bloch Surface Wave in all-dielectric photonic crystal which was experimentally realized earlier. The calculations show that such structures are very perspective for technical applications.
{"title":"Long-lived Bloch Wave in All-dielectric Photonic Crystal","authors":"A. N. Bogolyubov, Z. Dombrovskaya, A. D. Nikitchenko","doi":"10.1109/piers55526.2022.9792869","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792869","url":null,"abstract":"We perform quantitative estimations of lifetime and energy transfer coefficient for the Bloch Surface Wave in all-dielectric photonic crystal which was experimentally realized earlier. The calculations show that such structures are very perspective for technical applications.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"21 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":"124555501","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/PIERS55526.2022.9793108
Zhanheng Liu, Hongtao Liu, Y. Luo
Electromagnetic metamaterials are based on artificial design, such as composite left-right-handed structure (CRLH), split ring resonator (SRR) and Mushroom, and the periodical configurations can be taken advantages of to realize tunable properties via integrating active components such as varactor diodes into metamaterial units. In this paper, an active metamaterial antenna with tunable zero-order resonance(ZOR) is proposed with utilizing Mushroom structure to realize the narrow band. Particularly, varactor diodes are utilized in each unit cell, thus, by supplying different voltages, the capacitance of varactor diodes is changed, resulting in tunable ZORs. The measured results of the antenna are consistent with the simulated results. The proposed antenna can be used in 5G narrowband Internet of Things in the near future due to its good narrowband characteristics in Sub-6GHz band.
{"title":"An Active Metamaterial Antenna with Tunable Zero-order Resonances","authors":"Zhanheng Liu, Hongtao Liu, Y. Luo","doi":"10.1109/PIERS55526.2022.9793108","DOIUrl":"https://doi.org/10.1109/PIERS55526.2022.9793108","url":null,"abstract":"Electromagnetic metamaterials are based on artificial design, such as composite left-right-handed structure (CRLH), split ring resonator (SRR) and Mushroom, and the periodical configurations can be taken advantages of to realize tunable properties via integrating active components such as varactor diodes into metamaterial units. In this paper, an active metamaterial antenna with tunable zero-order resonance(ZOR) is proposed with utilizing Mushroom structure to realize the narrow band. Particularly, varactor diodes are utilized in each unit cell, thus, by supplying different voltages, the capacitance of varactor diodes is changed, resulting in tunable ZORs. The measured results of the antenna are consistent with the simulated results. The proposed antenna can be used in 5G narrowband Internet of Things in the near future due to its good narrowband characteristics in Sub-6GHz band.","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":"127714059","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/piers55526.2022.9792963
M. Maksutoglu, A. Ghirri, S. Yorulmaz, Fikret Yildiz, M. Affronte, B. Rameev
Studies on spin waves (magnons) formed by collective electron spin excitations in magnetic materials have recently gained importance due to their great potential for magnonics and hybrid quantum systems. In this study, the magnetostatic spin-wave modes excited as a result of the coupling between the 2D microwave resonator and the YIG sphere have been investigated computationally. The simulations have been performed using commercial finite element method software (CST Studio Suite). The 2D microwave resonator is realized on the ground plane of the broadband microstrip structure by using a low-loss printed circuit board. The calculations reveal the Q factor to be about 300 by optimizing the resonance frequency to 7 GHz. The most interesting result of simulations is the observation that the magneto-static spin-wave modes of the YIG sphere may be excited depending on the geometry of the hybrid structure. A strong interaction between the YIG and the microwave resonator observed in the dispersion curves of these modes reveals the realization of the strong coupling regime, which is a prerequisite of their use in quantum hybrid devices.
磁性材料中由集体电子自旋激发形成的自旋波(磁振子)的研究近年来因其在磁振学和混合量子系统中的巨大潜力而变得重要。本文对二维微波谐振腔与YIG球耦合所激发的静磁自旋波模式进行了计算研究。利用商业有限元软件(CST Studio Suite)进行了仿真。利用低损耗印刷电路板在宽带微带结构的地平面上实现了二维微波谐振器。计算结果表明，将谐振频率优化到7 GHz时，Q因子约为300。模拟中最有趣的结果是观察到YIG球的静磁自旋波模式可能会根据混合结构的几何形状而被激发。在这些模式的色散曲线中观察到YIG与微波谐振腔之间的强相互作用，揭示了强耦合状态的实现，这是它们在量子混合器件中使用的先决条件。
{"title":"Modelling Studies of Magnetostatic Modes in Hybrid MW-YIG Structures","authors":"M. Maksutoglu, A. Ghirri, S. Yorulmaz, Fikret Yildiz, M. Affronte, B. Rameev","doi":"10.1109/piers55526.2022.9792963","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792963","url":null,"abstract":"Studies on spin waves (magnons) formed by collective electron spin excitations in magnetic materials have recently gained importance due to their great potential for magnonics and hybrid quantum systems. In this study, the magnetostatic spin-wave modes excited as a result of the coupling between the 2D microwave resonator and the YIG sphere have been investigated computationally. The simulations have been performed using commercial finite element method software (CST Studio Suite). The 2D microwave resonator is realized on the ground plane of the broadband microstrip structure by using a low-loss printed circuit board. The calculations reveal the Q factor to be about 300 by optimizing the resonance frequency to 7 GHz. The most interesting result of simulations is the observation that the magneto-static spin-wave modes of the YIG sphere may be excited depending on the geometry of the hybrid structure. A strong interaction between the YIG and the microwave resonator observed in the dispersion curves of these modes reveals the realization of the strong coupling regime, which is a prerequisite of their use in quantum hybrid devices.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"59 Pt A 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":"114114032","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/piers55526.2022.9793283
Jingzheng Lu, Jun-ping Geng, Weinan Gao, Da Su, Yangzhou Zhang, Jing Zhang, Chaofan Ren, Kun Wang, Han Zhou, Chong He, Xianling Liang, R. Jin
In this paper, a novel circularly polarized (CP) leaky-wave antenna with wide bandwidth is presented. The proposed antenna has a structure based on a microstrip line loaded with X-shaped slots. To generate circularly polarized waves, the feeding position of the microstrip line is shifted from the center of the X-slot to the edge. Then the straight feed line can form the phase difference between two arms of the X-slot without a meandering line, increasing the radiation efficiency. When the phase difference is 90degrees, the two arms radiate orthogonal field within required phases, thus synthesizing circular polarization. The arms of the X-slot have no spatial phase difference which makes the radiating element have a wide CP bandwidth. The simulated results show that the proposed antenna realizes available impedance bandwidth of 45.01% (2.72GHz–4.30GHz) and CP bandwidth of 13.01% (3GHz–3.42GHz). The radiation efficiency of the leaky-wave antenna is from 82.1% to 95.4% and the gain is from 2.48dBi to 3.6dBi with bi-directional radiation in the operating bandwidth. The overall size of the proposed antenna is $0. 356 lambda_{0}, times 0. 356 lambda_{0}$, where $lambda _{0}$ is the free-space wavelength at the center frequency of the operating bandwidth. According to the phase transmission characteristic, it is convenient to extend a backward to forward scanning array with the proposed antenna. With the wide bandwidth and high scanning rate, the array has the potential to realize large-angle frequency scanning with circular polarization. The proposed leaky-wave antenna could be a good choice for radar applications and microwave imaging.
{"title":"A Wideband Circularly Polarized Leaky-wave Antenna","authors":"Jingzheng Lu, Jun-ping Geng, Weinan Gao, Da Su, Yangzhou Zhang, Jing Zhang, Chaofan Ren, Kun Wang, Han Zhou, Chong He, Xianling Liang, R. Jin","doi":"10.1109/piers55526.2022.9793283","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793283","url":null,"abstract":"In this paper, a novel circularly polarized (CP) leaky-wave antenna with wide bandwidth is presented. The proposed antenna has a structure based on a microstrip line loaded with X-shaped slots. To generate circularly polarized waves, the feeding position of the microstrip line is shifted from the center of the X-slot to the edge. Then the straight feed line can form the phase difference between two arms of the X-slot without a meandering line, increasing the radiation efficiency. When the phase difference is 90degrees, the two arms radiate orthogonal field within required phases, thus synthesizing circular polarization. The arms of the X-slot have no spatial phase difference which makes the radiating element have a wide CP bandwidth. The simulated results show that the proposed antenna realizes available impedance bandwidth of 45.01% (2.72GHz–4.30GHz) and CP bandwidth of 13.01% (3GHz–3.42GHz). The radiation efficiency of the leaky-wave antenna is from 82.1% to 95.4% and the gain is from 2.48dBi to 3.6dBi with bi-directional radiation in the operating bandwidth. The overall size of the proposed antenna is $0. 356 lambda_{0}, times 0. 356 lambda_{0}$, where $lambda _{0}$ is the free-space wavelength at the center frequency of the operating bandwidth. According to the phase transmission characteristic, it is convenient to extend a backward to forward scanning array with the proposed antenna. With the wide bandwidth and high scanning rate, the array has the potential to realize large-angle frequency scanning with circular polarization. The proposed leaky-wave antenna could be a good choice for radar applications and microwave imaging.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 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":"128200585","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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