Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium最新文献_第8页

A PARAMETER-FREE CALIBRATION PROCESS FOR A SCHEIMPFLUG LIDAR FOR VOLUMETRIC PROFILING 一种用于体积剖面的激光雷达无参数校准方法

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2020-01-01 DOI: 10.2528/pier20120701

Longqiang Luo, Xiang Chen, Zhanpeng Xu, Shuo Li, Yaoran Sun, Sailing He

引用次数: 5

DUAL-MODE HYPERSPECTRAL BIO-IMAGER WITH A CONJUGATED CAMERA FOR QUICK OBJECT-SELECTION AND FOCUSING 双模高光谱生物成像仪与一个共轭相机快速对象选择和聚焦

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2020-01-01 DOI: 10.2528/pier20080308

Xinli Yao, Shuo Li, Sailing He

引用次数: 6

IMPACT OF PERMITTIVITY PATTERNS ON FULLY POLARIMETRIC BRIGHTNESS TEMPERATURE SIGNATURES AT L-BAND 介电常数模式对l波段全偏振亮度温度特征的影响

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-11-20 DOI: 10.2528/pier19080204

M. Link, C. Montzka, T. Jagdhuber, S. Søbjærg, S. Dill, M. Peichl, T. Meyer, F. Jonard

{"title":"IMPACT OF PERMITTIVITY PATTERNS ON FULLY POLARIMETRIC BRIGHTNESS TEMPERATURE SIGNATURES AT L-BAND","authors":"M. Link, C. Montzka, T. Jagdhuber, S. Søbjærg, S. Dill, M. Peichl, T. Meyer, F. Jonard","doi":"10.2528/pier19080204","DOIUrl":"https://doi.org/10.2528/pier19080204","url":null,"abstract":"This study investigates the sensitivity of L-band (1.41GHz) polarimetric brightness temperature signatures to oriented permittivity patterns, which can occur for example in the case of row and interrow soil moisture differences in agricultural fields. A field experiment and model simulations are conducted to verify the effects of such patterns on all four Stokes parameters. We find that for an artificial target resembling idealized model conditions, permittivity patterns lead to systematic brightness temperature modulations in dependency of the azimuthal look angle. For the specific field setup, modulations reach amplitudes of ∼ 4K and mostly affect h-polarized brightness temperatures as well as the first, second, and third Stokes parameters. Simulations of soil moisture patterns under idealized model conditions indicate even higher amplitudes (up to 60K for extreme cases). However, the effects occur only for permittivity layer widths of up to 8 cm (given the observing wavelength of 21 cm), which is lower than the row and interrow widths typically observed in agricultural settings. For this reason, and due to the idealized model geometry investigated here, future studies are needed to transfer the findings of this study to potential applications such as the sensing of oriented soil moisture patterns. Particular interest might lie in radiometry and reflectometry in lower frequency ranges such as P-band, where according to the threshold established here (8/21 wavelengths), permittivity layer widths of up to ∼ 45 cm could be observed.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80892146","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}

引用次数: 2

PHASELESS MICROWAVE IMAGING OF DIELECTRIC CYLINDERS: AN ARTIFICIAL NEURAL NETWORKS-BASED APPROACH 介质圆柱体的无相微波成像:一种基于人工神经网络的方法

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-07-25 DOI: 10.2528/PIER19080610

J. E. Fajardo, J. Galv'an, F. Vericat, C. M. Carlevaro, R. Irastorza

{"title":"PHASELESS MICROWAVE IMAGING OF DIELECTRIC CYLINDERS: AN ARTIFICIAL NEURAL NETWORKS-BASED APPROACH","authors":"J. E. Fajardo, J. Galv'an, F. Vericat, C. M. Carlevaro, R. Irastorza","doi":"10.2528/PIER19080610","DOIUrl":"https://doi.org/10.2528/PIER19080610","url":null,"abstract":"An inverse method for parameters estimation of infinite cylinders (the dielectric properties, location, and radius) in two dimensions from amplitude-only microwave information is presented. To this end two different Artificial Neural Networks (ANN) topologies are compared; Multilayer Perceptron (MLP) and a Convolutional Neural Network (CNN). Several simulations employing the Finite Differences in Time Domain (FDTD) method are performed to solve the direct electromagnetic problem and generate training, validation, and test sets for the ANN models. The magnitude of the mean errors in estimating the position and size of the cylinder are up to (1.9 $pm$ 3.3) mm and (0.2 $pm$ 0.8) mm for the MLP and CNN, respectively. The magnitude of the mean percentage relative errors in estimating the dielectric properties of the cylinder are up to (6.5 $pm$ 13.8) % and (0.0 $pm$ 7.2) % for the MLP and CNN, respectively. The errors in the parameters estimation from the MLP model are low, however, significantly lower errors were obtained with the CNN model. A validation example is shown using a simulation in three dimensions. Measurement examples with homogeneous and heterogeneous cylinders are presented aiming to prove the feasibility of the described method.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87195499","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}

引用次数: 12

RETRIEVAL APPROACH FOR DETERMINING SURFACE SUSCEPTIBILITIES AND SURFACE POROSITIES OF A SYMMETRIC METASCREEN FROM REFLECTION AND TRANSMISSION COEFFICIENTS 利用反射和透射系数反演对称超筛网表面磁化率和表面孔隙率的方法

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-02-22 DOI: 10.2528/pier19022305

C. Holloway, E. Kuester, Abdulaziz H. Haddab

{"title":"RETRIEVAL APPROACH FOR DETERMINING SURFACE SUSCEPTIBILITIES AND SURFACE POROSITIES OF A SYMMETRIC METASCREEN FROM REFLECTION AND TRANSMISSION COEFFICIENTS","authors":"C. Holloway, E. Kuester, Abdulaziz H. Haddab","doi":"10.2528/pier19022305","DOIUrl":"https://doi.org/10.2528/pier19022305","url":null,"abstract":"Recently we derived generalized sheet transition conditions (GSTCs) for electromagnetic fields at the surface of a metascreen (a metasurface with a ``fishnet'' structure, i.~e., a periodic array of arbitrary spaced apertures in a relatively impenetrable surface). The parameters in these GSTCs are interpreted as effective surface susceptibilities and surface porosities, which themselves are related to the geometry of the apertures that constitute the metascreen. In this paper, we use these GSTCs to derive the plane-wave reflection ($R$) and transmission ($T$) coefficients of a symmetric metascreen, expressed in terms of these surface parameters. From these equations, we develop a retrieval approach for determining the uniquely defined effective surface susceptibilities and surface porosities that characterize the metascreen from measured or simulated data for the $R$ and $T$ coefficients. We present the retrieved surface parameters for metascreens composed of five different types of apertures (circular holes, square holes, crosses, slots, and a square aperture filled with a high-contrast dielectric). The last example exhibits interesting resonances at frequencies where no resonances exist when the aperture is not filled, which opens up the possibility of designing metasurfaces with unique filtering properties. The retrieved surface parameters are validated by comparing them to other approaches.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77099229","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}

引用次数: 11

DECOUPLING OF TWO CLOSELY LOCATED DIPOLES BY A SINGLE PASSIVE SCATTERER FOR ULTRA-HIGH FIELD MRI 在超高场核磁共振中，用单一被动散射体解耦两个位置紧密的偶极子

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-17 DOI: 10.2528/PIER18101703

M. S. M. Mollaei, S. Kurdjumov, A. Hurshkainen, C. Simovski

引用次数: 2

HIGH-SENSITIVITY AND TEMPERATURE-INSENSITIVE REFRACTOMETER BASED ON TNHF STRUCTURE FOR LOW-RANGE REFRACTIVE INDEX MEASUREMENT 基于TNHF结构的高灵敏度温度不敏感折射率计用于低范围折射率测量

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-01 DOI: 10.2528/pier19102301

F. Wang, Kaibo Pang, Tao Ma, X. Wang, Yufang Liu

{"title":"HIGH-SENSITIVITY AND TEMPERATURE-INSENSITIVE REFRACTOMETER BASED ON TNHF STRUCTURE FOR LOW-RANGE REFRACTIVE INDEX MEASUREMENT","authors":"F. Wang, Kaibo Pang, Tao Ma, X. Wang, Yufang Liu","doi":"10.2528/pier19102301","DOIUrl":"https://doi.org/10.2528/pier19102301","url":null,"abstract":"Refractive index (RI) measurements find extensive use in biochemical sensing field. However, currently available RI sensors exhibit excessive temperature crosstalk and have low sensitivity in the low RI range. To solve this, a high-sensitivity and temperature-insensitive refractometer based on a tapered no-core-hollow-core fiber (TNHF) structure is proposed for low-range RI measurement. The TNHF comprises two Mach-Zehnder interferometers that are introduced within the tapered nocore fiber and hollow-core fiber, thereby establishing a composite interference. The results of an experimental evaluation demonstrate that maximum sensitivities of 482.74 nm/RIU within an RI range of 1.335 ∼ 1.3462 can be achieved, which is greater than that achieved using a traditional modal interferometer structure. Significantly, the refractometer exhibits ultra-low temperature sensitivities of 0.062 dB/◦C and 6.5 pm/◦C, which can alleviate the temperature crosstalk. The refractometer can be realistically applied in many fields requiring high precision RI measurement due to its advantages of low cost, ease of manufacture, high sensitivity, and temperature insensitivity.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78310017","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}

引用次数: 2

INTERNAL MAGNETIC INDUCTION TOMOGRAPHY USING A SINGLE COIL 使用单线圈的内部磁感应断层扫描

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-01 DOI: 10.2528/PIER18120408

J. Feldkamp, S. Quirk

{"title":"INTERNAL MAGNETIC INDUCTION TOMOGRAPHY USING A SINGLE COIL","authors":"J. Feldkamp, S. Quirk","doi":"10.2528/PIER18120408","DOIUrl":"https://doi.org/10.2528/PIER18120408","url":null,"abstract":"Most imaging modalities image an object’s interior while all instrumentation, including sources and receivers, is externally located. One notable exception is ultra-sound (US), which can be miniaturized sufficiently to locate a US transducer within an object and gather data for image reconstruction. Another is cross-borehole geophysical imaging. The goal of any internal imaging modality is to provide images of greater fidelity while avoiding interfering structures. Due to the bulkiness of multi-coil magnetic induction tomography (MIT), transmitting and receiving coils are never placed within small targets (e.g., a human body). Here, we demonstrate a novel implementation of single-coil MIT that performs a scan all while the coil is located within the interior of a small, labcreated phantom consisting of salt-doped agarose. Phantom geometry is annular, consisting of a 6.0 cm diameter channel of depth 5.5 cm surrounded by a 3.0 cm thick cylindrical wall. An embedded, centrally located agarose gel annulus, 2.0 cm thick, is doped with sufficient NaCl to elevate its conductivity above that of surrounding agarose. The resulting nearly axisymmetric phantoms consist of material having conductivity ranging from 0.11 to 10.55 S/m. A scan is accomplished robotically, with the coil stubmounted on the positioning head of a 3-axis controller that positions the planar circular loop coil into 360 or 720 preset internal positions. Image reconstruction from gathered data is shown to correctly reveal the location, size and conductivity of the approximately axisymmetric inclusion.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90070384","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}

引用次数: 5

PERFORMANCE IMPROVEMENT AND ANTENNA DESIGN OF LEFT-HANDED MATERIAL UNITS BASED ON TOPOLOGICAL DEFORMATIONS 基于拓扑变形的左手材料单元性能改进与天线设计

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-01 DOI: 10.2528/pier19011603

B. You, M. Dong, Jianhua Zhou, Haike Xu

{"title":"PERFORMANCE IMPROVEMENT AND ANTENNA DESIGN OF LEFT-HANDED MATERIAL UNITS BASED ON TOPOLOGICAL DEFORMATIONS","authors":"B. You, M. Dong, Jianhua Zhou, Haike Xu","doi":"10.2528/pier19011603","DOIUrl":"https://doi.org/10.2528/pier19011603","url":null,"abstract":"In this paper, by applying topological theory, we evaluate some left-handed unit structures. Based on the classification of topological deformation, the laws and characteristics of potential electromagnetic parameters are captured. The original left-handed material unit is realized by using a circular C-shaped coupling ring, whose whole size is 10×10×0.5 mm3. Through three kinds of topological deformations, to explore the influence of topology on antenna performance, the electromagnetic parameters and left-handed characteristics of the original and modified units are compared and analyzed. For the designed handshake-shaped unit structure, simulation analysis predicts that dual-frequency, or even multi-band left-handed characteristics, can be achieved. To expand the structural performance of the handshake-shaped unit, an annular line for coupling enhancement is added inside the U-shaped structure to form an integrally coupled annular unit structure. Simulation results show that, with amplitudes of reflection coefficients of −27.1 dB and −14.5 dB, the resonance points of the improved unit structure are 3.57 GHz and 5.64 GHz, respectively. Loading the unit structure with a dual-band lefthanded characteristic, a UWB antenna is designed and analyzed in detail. Through simulation, antenna performance is most affected by interference within the range of 2.5 ∼ 5.0 GHz, which coincides with the double negative frequency band of the loaded left-handed structural unit. The notch frequency band of the designed UWB antenna, which is much wider than traditional notch antennas, is 3.62 ∼ 4.54 GHz, with a notch bandwidth of 920 MHz.","PeriodicalId":90705,"journal":{"name":"Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73333190","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}

引用次数: 4

TWO-PHOTON LUMINESCENCE AND SECOND HARMONIC GENERATION OF SINGLE LAYER MOLYBDENUM DISULPHIDE NANOPROBE FOR NONBLEACHING AND NONBLINKING OPTICAL BIOIMAGING 用于非漂白和非闪烁光学生物成像的单层二硫化钼纳米探针的双光子发光和二次谐波产生

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-01 DOI: 10.2528/pier19072502

Qiuqiang Zhan, Xin Zhang, Baoju Wang, Nana Li, Sailing He

引用次数: 6