Pub Date : 2018-03-01DOI: 10.1109/COMPEM.2018.8496525
Tong Wang, Shiquan He, Yi Liu
Numerical simulation is an effective method for evaluating electromagnetic pulse (EMP) around the capacitor discharging circuits and impulse currents in the discharging circuits. The augment electric-field integral equation (AEFIE) and time-frequency transitional method are applied to overcome low frequency collapse. Besides that, model simplification can save much simulation time under the guaranteeing precision premise. In the comparison of experiments with simulation, the periodic error and amplitude error are within 5% and 20%. More importantly, impulse currents can be derived by integrating voltages wave in the B-Dot. This simulation method based on AEFIE and time-frequency transition solves integrated simulation of capacitor discharge circuits and can be applied in designing testing probes.
{"title":"Simulation and Measurement of EMP Emission by Capacitor Discharge Circuits","authors":"Tong Wang, Shiquan He, Yi Liu","doi":"10.1109/COMPEM.2018.8496525","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496525","url":null,"abstract":"Numerical simulation is an effective method for evaluating electromagnetic pulse (EMP) around the capacitor discharging circuits and impulse currents in the discharging circuits. The augment electric-field integral equation (AEFIE) and time-frequency transitional method are applied to overcome low frequency collapse. Besides that, model simplification can save much simulation time under the guaranteeing precision premise. In the comparison of experiments with simulation, the periodic error and amplitude error are within 5% and 20%. More importantly, impulse currents can be derived by integrating voltages wave in the B-Dot. This simulation method based on AEFIE and time-frequency transition solves integrated simulation of capacitor discharge circuits and can be applied in designing testing probes.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117098711","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496674
Zhijiao Chen, L. Qi, Yuan Yao, Junsheng Yu, Xiao-dong Chen
In this paper, a reconfigurable Dielectric Resonator Antenna (DRA) is proposed with continuously tunable radiation pattern for IEEE 802.11ac. A wideband variable concentric phase shifter was designed with continuously output phase shift over a wide impedance bandwidth on 5–6 GHz. This phase shifter is then integrated to a pattern reconfigurable DRA. And a continuously tuning between cardioid to directional radiation patterns is obtained over the operating band. The proposed mechanism gives a cost-effective solution to enable overage reconfigurable service for the IEEE 802.11ac applications.
{"title":"A Continuously Tunable Pattern Reconfigurable Dielectric Resonator Antenna for IEEE 802.11ac Applications","authors":"Zhijiao Chen, L. Qi, Yuan Yao, Junsheng Yu, Xiao-dong Chen","doi":"10.1109/COMPEM.2018.8496674","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496674","url":null,"abstract":"In this paper, a reconfigurable Dielectric Resonator Antenna (DRA) is proposed with continuously tunable radiation pattern for IEEE 802.11ac. A wideband variable concentric phase shifter was designed with continuously output phase shift over a wide impedance bandwidth on 5–6 GHz. This phase shifter is then integrated to a pattern reconfigurable DRA. And a continuously tuning between cardioid to directional radiation patterns is obtained over the operating band. The proposed mechanism gives a cost-effective solution to enable overage reconfigurable service for the IEEE 802.11ac applications.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129807245","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496566
Liangshuai Guo, Huiyuan Zhang, Zichang Liang
This paper studies the effect of multi-path scattering in complex target, like dihedral angle, cavity and coupling parts, in radar imaging. Because of the local effect in high frequency scattering, the coupling effects are ignored in radar imaging. This approximation produces the error between pixel distribution and really projection of target. Many of the conventional imaging methods assume the EM waves are scattered just once (Born-approximation) from the target before returning to the detector. In reality, the EM waves can be scattered several times before returning to the detector. This approximation again produces error in the imaging method. In this paper, shooting bouncing ray method (SBR), which considers the coupling scattering of the targets is calculated, the difference are considered from the multi-path scattering can contribute largely in radar imaging.
{"title":"Research in the Effect of Multi-Path Coupling Scattering in Radar Imaging","authors":"Liangshuai Guo, Huiyuan Zhang, Zichang Liang","doi":"10.1109/COMPEM.2018.8496566","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496566","url":null,"abstract":"This paper studies the effect of multi-path scattering in complex target, like dihedral angle, cavity and coupling parts, in radar imaging. Because of the local effect in high frequency scattering, the coupling effects are ignored in radar imaging. This approximation produces the error between pixel distribution and really projection of target. Many of the conventional imaging methods assume the EM waves are scattered just once (Born-approximation) from the target before returning to the detector. In reality, the EM waves can be scattered several times before returning to the detector. This approximation again produces error in the imaging method. In this paper, shooting bouncing ray method (SBR), which considers the coupling scattering of the targets is calculated, the difference are considered from the multi-path scattering can contribute largely in radar imaging.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129948813","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496663
Wentao Li, Xiao-wei Shi
In this paper, the low-sidelobe pattern synthesis of range-angle-dependent frequency diverse array (FDA) is studied. Unlike the conventional phased array, the frequency diverse array employs a tiny frequency shift compared to the carrier frequency across the array elements. As the frequency diverse array (FDA) introduces additional degrees-of-freedom (DOF), the antenna pattern is rang-angle-dependent and allows the array transmit energy over a desired range or angle. A hybrid artificial bee colony algorithm and differential evolution algorithm called ABC-DE is employed for the low-sidelobe design for frequency diverse arrays. Numerical results for FDA with low sidelobe level are presented to validate the effectiveness of the proposed approach.
{"title":"Low-Sidelobe Pattern Synthesis in Range and Angle Domains for Frequency Diverse Arrays","authors":"Wentao Li, Xiao-wei Shi","doi":"10.1109/COMPEM.2018.8496663","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496663","url":null,"abstract":"In this paper, the low-sidelobe pattern synthesis of range-angle-dependent frequency diverse array (FDA) is studied. Unlike the conventional phased array, the frequency diverse array employs a tiny frequency shift compared to the carrier frequency across the array elements. As the frequency diverse array (FDA) introduces additional degrees-of-freedom (DOF), the antenna pattern is rang-angle-dependent and allows the array transmit energy over a desired range or angle. A hybrid artificial bee colony algorithm and differential evolution algorithm called ABC-DE is employed for the low-sidelobe design for frequency diverse arrays. Numerical results for FDA with low sidelobe level are presented to validate the effectiveness of the proposed approach.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128422487","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496477
Z. Zhang, Ying Zhao, D. Ding, Rushan Chen
A volume surface integral equation (VSIE) for analyzing electromagnetic scattering properties of graphene and dielectric structure model is described. The proposed scheme discretizes a resistive boundary condition (RBC) enforced on the infinitesimally thin graphene sheet. The equivalent model of conductivity is also introduced by the electronic movement model of graphene under the bias of electric field. Numerical results are presented which demonstrate the applicability and accuracy of the proposed scheme.
{"title":"Analysis of Electromagnetic Scattering from Graphene with Volume Surface Integral Equation Method","authors":"Z. Zhang, Ying Zhao, D. Ding, Rushan Chen","doi":"10.1109/COMPEM.2018.8496477","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496477","url":null,"abstract":"A volume surface integral equation (VSIE) for analyzing electromagnetic scattering properties of graphene and dielectric structure model is described. The proposed scheme discretizes a resistive boundary condition (RBC) enforced on the infinitesimally thin graphene sheet. The equivalent model of conductivity is also introduced by the electronic movement model of graphene under the bias of electric field. Numerical results are presented which demonstrate the applicability and accuracy of the proposed scheme.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129139953","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496455
Rongrong Zhang, Ping-Hao Jia, Lun Hu, Z. Nie
This paper presented an effective preconditioning technique for iteratively solving FE-BI equation. In this method, the first order Robin-type TC is used to connect the interfaces of FEM and BI regions and the second order TC is used to joint the interfaces in interior FEM regions. The method not only provides a robust and effective preconditioner but also gives a novel way to establish and deal with eletromagnetic models.
{"title":"FEM-DDM-BEM for a 3-D Electromagnetic Scattering Analysis of Metal Dieletric Composite Structure","authors":"Rongrong Zhang, Ping-Hao Jia, Lun Hu, Z. Nie","doi":"10.1109/COMPEM.2018.8496455","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496455","url":null,"abstract":"This paper presented an effective preconditioning technique for iteratively solving FE-BI equation. In this method, the first order Robin-type TC is used to connect the interfaces of FEM and BI regions and the second order TC is used to joint the interfaces in interior FEM regions. The method not only provides a robust and effective preconditioner but also gives a novel way to establish and deal with eletromagnetic models.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129149476","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496470
Yahui Zhang, Bian Wu, Yutong Zhao, Wei Zhang, Lianxing He
In this paper, a novel compact graphene-based six-way power divider is presented. It has planar structure and can be manufactured easily through PCB process combined with laser etching. Circular graphene film is utilized as omnidirectional isolation resistance between arbitrary two output ports, avoiding traditional welding process of fussy lumped resistance. The six-way power divider, realized by double-layer microstrip structure, works at the frequency range from 1.8GHz to 2.8GHz. The final simulation result shows that the structure has a distribution loss of 8dB and an insertion loss of ±0.6dB, the port isolation is always better than 20dB.
{"title":"A Compact Graphene-Based Six-Way Power Divider","authors":"Yahui Zhang, Bian Wu, Yutong Zhao, Wei Zhang, Lianxing He","doi":"10.1109/COMPEM.2018.8496470","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496470","url":null,"abstract":"In this paper, a novel compact graphene-based six-way power divider is presented. It has planar structure and can be manufactured easily through PCB process combined with laser etching. Circular graphene film is utilized as omnidirectional isolation resistance between arbitrary two output ports, avoiding traditional welding process of fussy lumped resistance. The six-way power divider, realized by double-layer microstrip structure, works at the frequency range from 1.8GHz to 2.8GHz. The final simulation result shows that the structure has a distribution loss of 8dB and an insertion loss of ±0.6dB, the port isolation is always better than 20dB.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124783313","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496658
Gang Cui, L. Shi, Jiazhi Ma, Xuesong Wang
A new polarization property of chaff cloud is found, differential reflectivity varying with height during diffusion. The differential reflectivity (ZDR) of chaff fiber can be predicted as a function of time and initial orientation. The description of the chaff properties statistical changes from integrated to sectional, which Using this property, distribution curve of differential reflectivity will be plotted after the release of chaff fiber. The results of differential reflectivity stratification can be used as an explanation of the chaff event at the Key West, FL KBYX WSR-88D site on 17 June 2016.
{"title":"Study on Chaff Diffusion and Polarization Stratification","authors":"Gang Cui, L. Shi, Jiazhi Ma, Xuesong Wang","doi":"10.1109/COMPEM.2018.8496658","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496658","url":null,"abstract":"A new polarization property of chaff cloud is found, differential reflectivity varying with height during diffusion. The differential reflectivity (ZDR) of chaff fiber can be predicted as a function of time and initial orientation. The description of the chaff properties statistical changes from integrated to sectional, which Using this property, distribution curve of differential reflectivity will be plotted after the release of chaff fiber. The results of differential reflectivity stratification can be used as an explanation of the chaff event at the Key West, FL KBYX WSR-88D site on 17 June 2016.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129201520","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496645
Yongfu Liu, Shiquan He, Juping Li, Lingyu Cao
This paper describes an improved method based on the Magnetic Scalar Potential Volume Integral Method (MSP-VIM) to solve 3-D nonlinear magnetostatic problems. The impedance matrix generated by the Method of Moment (MoM) is separated into constant part and nonlinear part. Moreover, the constant part is further compressed with Multilevel Singular Value Decomposition (MLSVD). Besides, the simplified calculation for symmetrical structure is applied to decrease the unknowns and reduce matrix dimension. Consequently, the iterative solution of nonlinear problems becomes easy and fast. The accuracy and efficiency of the proposed method are demonstrated by numerical examples.
{"title":"Application of Magnetic Scalar Potential Volume Integral Method in Nonlinear Magnetostatic Problems","authors":"Yongfu Liu, Shiquan He, Juping Li, Lingyu Cao","doi":"10.1109/COMPEM.2018.8496645","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496645","url":null,"abstract":"This paper describes an improved method based on the Magnetic Scalar Potential Volume Integral Method (MSP-VIM) to solve 3-D nonlinear magnetostatic problems. The impedance matrix generated by the Method of Moment (MoM) is separated into constant part and nonlinear part. Moreover, the constant part is further compressed with Multilevel Singular Value Decomposition (MLSVD). Besides, the simplified calculation for symmetrical structure is applied to decrease the unknowns and reduce matrix dimension. Consequently, the iterative solution of nonlinear problems becomes easy and fast. The accuracy and efficiency of the proposed method are demonstrated by numerical examples.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123524272","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}
Microwave induced thermo-acoustic tomography (MITAT) is a hybrid imaging technology which has drawn widespread attention. The inhomogeneous acoustic impedance that depends on velocity of acoustic and density will affect the imaging quality in MITAT. In this paper, we adopt a clustering method to reconstruct the distribution of inhomogeneous density instead of an assumption of a constant density. The clustering method divide the region of interest (RDI) into several parts and these parts represent different densities which mean different tissues. Experiment demonstrates that adopting a clustering method., the density distribution is more accurate which results in better imaging quality. This research indicates that reducing the effects of inhomogeneous density will improve the imaging quality.
{"title":"Reducing the Effects of Inhomogeneous Density with a Clustering Method in Microwave Induced Thermo-Acoustic Tomography","authors":"Xiaoxuan Sun, Shuangli Liu, B. Wang, Zifang Guo, Zhiqin Zhao, Xinyan Zhao, Yicai Tang","doi":"10.1109/COMPEM.2018.8496460","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496460","url":null,"abstract":"Microwave induced thermo-acoustic tomography (MITAT) is a hybrid imaging technology which has drawn widespread attention. The inhomogeneous acoustic impedance that depends on velocity of acoustic and density will affect the imaging quality in MITAT. In this paper, we adopt a clustering method to reconstruct the distribution of inhomogeneous density instead of an assumption of a constant density. The clustering method divide the region of interest (RDI) into several parts and these parts represent different densities which mean different tissues. Experiment demonstrates that adopting a clustering method., the density distribution is more accurate which results in better imaging quality. This research indicates that reducing the effects of inhomogeneous density will improve the imaging quality.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116272964","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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