Pub Date : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343477
Changyou Li, Q. Zhu, Xiao-xiang He
The electromagnetic properties of fiber-reinforced laminated composite are studied and optimized here, with the fibers in the structure are organized in a periodic way. The laminate is consist of multiple layers with the fibers in each layer periodically arranged and bind together by the matrix which can be epoxy or ceramics etc. A number of fibers are embedded into one periodic cell and bind together to form a fiber bundle for wave absorption enhancement. The electromagnetic wave scattering properties of this composite are studied in detail with different structural and electromagnetic parameters. The constrained optimization by linear approximations is applied for optimization the reflection and transmission properties of the structure. The finite-difference time-domain method is applied in this article for the numerical investigations. Short Gaussian pulse is used as the source for the time domain simulation, and a Fourier transformation is then applied to get the field distribution and the reflection/transmission coefficients in a wide frequency band. Various numerical results are presented with detailed discussions.
{"title":"Electromagnetic properties and optimizations of the laminated composites","authors":"Changyou Li, Q. Zhu, Xiao-xiang He","doi":"10.1109/NEMO49486.2020.9343477","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343477","url":null,"abstract":"The electromagnetic properties of fiber-reinforced laminated composite are studied and optimized here, with the fibers in the structure are organized in a periodic way. The laminate is consist of multiple layers with the fibers in each layer periodically arranged and bind together by the matrix which can be epoxy or ceramics etc. A number of fibers are embedded into one periodic cell and bind together to form a fiber bundle for wave absorption enhancement. The electromagnetic wave scattering properties of this composite are studied in detail with different structural and electromagnetic parameters. The constrained optimization by linear approximations is applied for optimization the reflection and transmission properties of the structure. The finite-difference time-domain method is applied in this article for the numerical investigations. Short Gaussian pulse is used as the source for the time domain simulation, and a Fourier transformation is then applied to get the field distribution and the reflection/transmission coefficients in a wide frequency band. Various numerical results are presented with detailed discussions.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130304674","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343594
Yan Li, Yang Shi, Zhi-yi Gao, Hao-Nan Zhou, Chuang-Chuang Fang, W. Tian
In this paper, the mechanism of passive intermodulation on the metal contact surface is analyzed. According to the roughness contact model, the corresponding equivalent circuit model is established. The influence of metal contact surface roughness, contact area, mechanical loading, and excitation electromagnetic field strength on passive intermodulation power is studied with numerical simulation using ADS. The suppression measures to reduce passive intermodulation products in engineering applications are proposed.
{"title":"Simulation of Third-order Inorganic Intermodulation on a Rough Contact Surface","authors":"Yan Li, Yang Shi, Zhi-yi Gao, Hao-Nan Zhou, Chuang-Chuang Fang, W. Tian","doi":"10.1109/NEMO49486.2020.9343594","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343594","url":null,"abstract":"In this paper, the mechanism of passive intermodulation on the metal contact surface is analyzed. According to the roughness contact model, the corresponding equivalent circuit model is established. The influence of metal contact surface roughness, contact area, mechanical loading, and excitation electromagnetic field strength on passive intermodulation power is studied with numerical simulation using ADS. The suppression measures to reduce passive intermodulation products in engineering applications are proposed.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115557723","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343434
Yinfei Weng, Zachary Su
The article introduces an automatic synthesis method for on-chip transformer from electromagnetic (EM) simulations. Using this method, a transformer library, parametric layout and scalable model are generated quickly, then a fast search through the transformer space produces an optimal design. We used this method to design transformer for common wireless application. The synthesis method of transformer includes various constraints such as inductance, quality factors, and coupling coefficients to ensure that the synthesis results meet expectations, and the accuracy deviation is within 5%.
{"title":"Automatic Synthesis for On-chip Transformer","authors":"Yinfei Weng, Zachary Su","doi":"10.1109/NEMO49486.2020.9343434","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343434","url":null,"abstract":"The article introduces an automatic synthesis method for on-chip transformer from electromagnetic (EM) simulations. Using this method, a transformer library, parametric layout and scalable model are generated quickly, then a fast search through the transformer space produces an optimal design. We used this method to design transformer for common wireless application. The synthesis method of transformer includes various constraints such as inductance, quality factors, and coupling coefficients to ensure that the synthesis results meet expectations, and the accuracy deviation is within 5%.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114651201","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343656
Jiaming Chu, Wen-hua Chen, Long Chen, Zhenghe Feng
Due to the increase of signal bandwidth in the current fifth-generation (5G) communication, the strong memory effects of the power amplifier (PA) seriously deteriorate the linearity of the system, while traditional digital predistortion (DPD) algorithms do not work well in this scenario. In this paper, a cascaded Memory Polynomial-Neural Network (MP-NN) model is proposed to model the PAs with strong memory effects. By including prior information, the input of the neural network is changed from input signals over a period of time to the basis functions of input signals. In this way, the training process converges faster and achieves good modeling accuracy. Experimental results on a 3.2-3.8 GHz Doherty PA show that the proposed model outperforms the traditional MP model, the adjacent channel power ratio (ACPR) performance is improved from -36.7dBc to-48.8dBc
{"title":"A Cascaded Memory Polynomial-Neural Network Behavior Model For Digital Predistortion","authors":"Jiaming Chu, Wen-hua Chen, Long Chen, Zhenghe Feng","doi":"10.1109/NEMO49486.2020.9343656","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343656","url":null,"abstract":"Due to the increase of signal bandwidth in the current fifth-generation (5G) communication, the strong memory effects of the power amplifier (PA) seriously deteriorate the linearity of the system, while traditional digital predistortion (DPD) algorithms do not work well in this scenario. In this paper, a cascaded Memory Polynomial-Neural Network (MP-NN) model is proposed to model the PAs with strong memory effects. By including prior information, the input of the neural network is changed from input signals over a period of time to the basis functions of input signals. In this way, the training process converges faster and achieves good modeling accuracy. Experimental results on a 3.2-3.8 GHz Doherty PA show that the proposed model outperforms the traditional MP model, the adjacent channel power ratio (ACPR) performance is improved from -36.7dBc to-48.8dBc","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123715283","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343513
Yaqin Li, Shijie Huang, Liang Zhang, Xianliang Wu
An improved ultra-wideband low-coupling MIMO antenna based on a metamaterial periodic structure frequency-selective surface wide slot antenna is derived from the basic -shaped resonant ring.The antenna can be implemented without loading any parasitic branches low coupling and high gain, the relative bandwidth exceeds the international standard of ultra-wideband (20%),and at the same time uses metamaterials whose electromagnetic characteristics can be artificially changed as a medium,the element antennas are arranged in a 9 × 9 array and processed at 90° In order to achieve the goal of miniaturization,the structure is more compact The 37 GHz MIMO antenna with a structure size of 108 mm × 104 mm × 1 mm working in the 5G millimeter wave band is simulated.The results show that the peak gain of the unit antenna bandwidth is 10 dB,the impedance bandwidth is 21%, and the isolation is less than 20 dB. It meets the expected performance requirements of ultra-wideband, low coupling, miniaturization and other performances, and will have important applications in the area of 5G mobile communications.
{"title":"A new ultra-wideband MIMO antenna based on metamaterials for 5G","authors":"Yaqin Li, Shijie Huang, Liang Zhang, Xianliang Wu","doi":"10.1109/NEMO49486.2020.9343513","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343513","url":null,"abstract":"An improved ultra-wideband low-coupling MIMO antenna based on a metamaterial periodic structure frequency-selective surface wide slot antenna is derived from the basic -shaped resonant ring.The antenna can be implemented without loading any parasitic branches low coupling and high gain, the relative bandwidth exceeds the international standard of ultra-wideband (20%),and at the same time uses metamaterials whose electromagnetic characteristics can be artificially changed as a medium,the element antennas are arranged in a 9 × 9 array and processed at 90° In order to achieve the goal of miniaturization,the structure is more compact The 37 GHz MIMO antenna with a structure size of 108 mm × 104 mm × 1 mm working in the 5G millimeter wave band is simulated.The results show that the peak gain of the unit antenna bandwidth is 10 dB,the impedance bandwidth is 21%, and the isolation is less than 20 dB. It meets the expected performance requirements of ultra-wideband, low coupling, miniaturization and other performances, and will have important applications in the area of 5G mobile communications.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122773248","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343579
Lei Chen, Xiang Zhou, Yixing Gu
This paper presents a simple method for determining the width of the injection line when measuring the transfer impedance of coaxial cable by line injection method. In line injection test of coaxial cable, copper strip or copper foil with a certain width is commonly used as the injection line, and the reflection coefficient of the outer circuit is less than 0.1 by adjusting the width of the copper strip or copper foil. In this paper, the outer circuit model of the injection line-coaxial cable shielding layer is established, and the width of the injection line with the different thickness of the dielectric layer and the different relative dielectric constants is obtained by simulation software. Then, the function of the injection line width to the cable radius, the thickness of the dielectric layer and the relative dielectric constants is obtained by curve fitting based on the simulation data. Finally, it is verified that the reflection coefficient of the outer circuit with the injection line width determined by the given function meets the requirements of IEC 62153.4-6 through simulation.
{"title":"Method for Determining the Width of Injection Line for Line Injection Method of Cable Transfer Impedance","authors":"Lei Chen, Xiang Zhou, Yixing Gu","doi":"10.1109/NEMO49486.2020.9343579","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343579","url":null,"abstract":"This paper presents a simple method for determining the width of the injection line when measuring the transfer impedance of coaxial cable by line injection method. In line injection test of coaxial cable, copper strip or copper foil with a certain width is commonly used as the injection line, and the reflection coefficient of the outer circuit is less than 0.1 by adjusting the width of the copper strip or copper foil. In this paper, the outer circuit model of the injection line-coaxial cable shielding layer is established, and the width of the injection line with the different thickness of the dielectric layer and the different relative dielectric constants is obtained by simulation software. Then, the function of the injection line width to the cable radius, the thickness of the dielectric layer and the relative dielectric constants is obtained by curve fitting based on the simulation data. Finally, it is verified that the reflection coefficient of the outer circuit with the injection line width determined by the given function meets the requirements of IEC 62153.4-6 through simulation.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122791542","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}
Land clutter data is a key part in radar signal processing algorithm design. Measured land clutter data is important to radar users, but usually not enough for radar signal simulation. In this work, we measure the scattering of a typical ground object sample. Then we use generative adversarial network to learn measured land clutter data, and generate more data which can be applied to further radar signal simulation. Numerical simulations verify the validity of such method.
{"title":"Land Clutter Data Generation Using Generative Adversarial Network","authors":"Xunwang Dang, Yong Chen, Chao Wang, Hongcheng Yin, Honglei Xu","doi":"10.1109/NEMO49486.2020.9343606","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343606","url":null,"abstract":"Land clutter data is a key part in radar signal processing algorithm design. Measured land clutter data is important to radar users, but usually not enough for radar signal simulation. In this work, we measure the scattering of a typical ground object sample. Then we use generative adversarial network to learn measured land clutter data, and generate more data which can be applied to further radar signal simulation. Numerical simulations verify the validity of such method.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125188987","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343573
Zhen Lu, Liang Zhou, Xiaofeng Hu
In this paper, the failure of SiGe HBT is analyzed under high power microwave pulses. The transient simulation is conducted to obtain the temperature distributions and change of junction temperature with pulse injected. The calculated failure results are compared with measurement results which show close agreements.
{"title":"Electro-Thermal analysis of SiGe HBT under HPM Injection","authors":"Zhen Lu, Liang Zhou, Xiaofeng Hu","doi":"10.1109/NEMO49486.2020.9343573","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343573","url":null,"abstract":"In this paper, the failure of SiGe HBT is analyzed under high power microwave pulses. The transient simulation is conducted to obtain the temperature distributions and change of junction temperature with pulse injected. The calculated failure results are compared with measurement results which show close agreements.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126229994","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343566
Wei Lai, Zhi Wang, Minyou Chen, Hongjian Xia, Dan Luo, Yunhai Wei, B. Gao, Yigao Chen
With the extensive investment of wind turbine, it is significant to study the reliability and lifetime estimation model of its core components. Considering the effect of different failure sites on the remaining lifetime, the response of the converter at failure sites is studied. It is found that die attach solder fatigue and DBC (Direct Bonding Copper) solder fatigue, which happen frequently during the serving time, have different effects on thermal loads. A modified Cauer-type thermal model is proposed according to the failure sites. Using a modified lifetime model, Remaining lifetime of the DFIG (Doubly Fed Induction Generator) converter is calculated under different health conditions and failure sites. Reliability analysis is very important to the health management of converter.
{"title":"Reliability Evaluation of IGBT Modules in Wind Power Converter Considering the Effects of Different Failure Sites","authors":"Wei Lai, Zhi Wang, Minyou Chen, Hongjian Xia, Dan Luo, Yunhai Wei, B. Gao, Yigao Chen","doi":"10.1109/NEMO49486.2020.9343566","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343566","url":null,"abstract":"With the extensive investment of wind turbine, it is significant to study the reliability and lifetime estimation model of its core components. Considering the effect of different failure sites on the remaining lifetime, the response of the converter at failure sites is studied. It is found that die attach solder fatigue and DBC (Direct Bonding Copper) solder fatigue, which happen frequently during the serving time, have different effects on thermal loads. A modified Cauer-type thermal model is proposed according to the failure sites. Using a modified lifetime model, Remaining lifetime of the DFIG (Doubly Fed Induction Generator) converter is calculated under different health conditions and failure sites. Reliability analysis is very important to the health management of converter.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125003234","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 : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343504
Shuting Qin, K. Zheng, Kang An, Xiaoman Sun, Chuanwei Wu
This paper focuses on the characteristics of electromagnetic waves in dusty plasma. On the basis of verifying the feasibility of the propagation matrix method used in dusty plasma, we layered the plasma and then found the basic law of electron concentration which is one of the factors affecting transport properties of wave.
{"title":"Study on the characteristics of wave transmission in dusty plasma","authors":"Shuting Qin, K. Zheng, Kang An, Xiaoman Sun, Chuanwei Wu","doi":"10.1109/NEMO49486.2020.9343504","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343504","url":null,"abstract":"This paper focuses on the characteristics of electromagnetic waves in dusty plasma. On the basis of verifying the feasibility of the propagation matrix method used in dusty plasma, we layered the plasma and then found the basic law of electron concentration which is one of the factors affecting transport properties of wave.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129901031","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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