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}
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/NEMO49486.2020.9343586
Pengju Yang, Wenjing Mu, R. Wu
A model of dynamic nonlinear sea surfaces damped by natural sea slicks is presented. Lombardini et al. model is adopted for predicting the hydrodynamic damping of sea surfaces in the presence of natural sea slicks, and "choppy wave model" (CWM) nonlinear sea surface is utilized for describing the nonlinear interactions between ocean waves. On this basis, the influence of sea slicks’ damping on Doppler spectrum of backscattered echoes from contaminated sea surface is investigated by comparison with that from clean sea surfaces. Numerical simulation shows a narrowing of the Doppler spectrum of contaminated sea surfaces compared to that of clean sea. In addition, it is also indicated that the Doppler shift in slicks can decrease or increase, depending on incidence angles.
{"title":"Investigation on Electromagnetic Scattering from Dynamic Sea Surfaces Covered by Natural Sea Slicks","authors":"Pengju Yang, Wenjing Mu, R. Wu","doi":"10.1109/NEMO49486.2020.9343586","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343586","url":null,"abstract":"A model of dynamic nonlinear sea surfaces damped by natural sea slicks is presented. Lombardini et al. model is adopted for predicting the hydrodynamic damping of sea surfaces in the presence of natural sea slicks, and \"choppy wave model\" (CWM) nonlinear sea surface is utilized for describing the nonlinear interactions between ocean waves. On this basis, the influence of sea slicks’ damping on Doppler spectrum of backscattered echoes from contaminated sea surface is investigated by comparison with that from clean sea surfaces. Numerical simulation shows a narrowing of the Doppler spectrum of contaminated sea surfaces compared to that of clean sea. In addition, it is also indicated that the Doppler shift in slicks can decrease or increase, depending on incidence angles.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"48 39","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120836644","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}
Surface Enhanced Raman Scattering (SERS) has become a spectroscopic detection technique widely used in many fields. This paper proposes a SERS electric field distribution prediction model based on deep learning, the average relative norm error of the test set is 3.6%. It takes about 3 minutes to perform an FDTD simulation for an Au nanosphere dimer on a high-performance server, while using the deep learning model on an ordinary PC only takes less than 0.003 seconds, which can be used as a kind of fast calculation tool in the optimization algorithm.
{"title":"SERS Prediction with Deep Learning","authors":"Zixuan Ma, Yanmeng Hu, Renmeng Cao, Mengmeng Li, Rushan Chen","doi":"10.1109/NEMO49486.2020.9343629","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343629","url":null,"abstract":"Surface Enhanced Raman Scattering (SERS) has become a spectroscopic detection technique widely used in many fields. This paper proposes a SERS electric field distribution prediction model based on deep learning, the average relative norm error of the test set is 3.6%. It takes about 3 minutes to perform an FDTD simulation for an Au nanosphere dimer on a high-performance server, while using the deep learning model on an ordinary PC only takes less than 0.003 seconds, which can be used as a kind of fast calculation tool in the optimization algorithm.","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":"129023560","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}
Pub Date : 2020-12-07DOI: 10.1109/NEMO49486.2020.9343574
Jindi Hu, Jin Huang, L. Kang, Jinzhu Zhou, Zhe Zhang, Wenhao Peng
This paper presents a flexible broadband power divider based on defect compensation that works in the 3-12GHz frequency band. In the design, the cascaded multi-section impedance converter is employed to expand the working bandwidth, at the same time, additional capacitance and inductance are introduced through the defective ground structure (DGS) to compensate for the performance of the splitter caused by bending. This paper analyzes the transmission characteristics of the flexible power divider in different directions and at different angles through numerical calculation and modeling simulation. The results show that the proposed compensation design scheme achieves a maximum insertion loss of -3.1dB within 3-12GHz, the flatness of the most in-band is less than 0.7dB, the isolation is <-15 dB. Finally, a prototype is fabricated and tested to verify the design method.
{"title":"Design of flexible broadband power divider based on defect ground compensation","authors":"Jindi Hu, Jin Huang, L. Kang, Jinzhu Zhou, Zhe Zhang, Wenhao Peng","doi":"10.1109/NEMO49486.2020.9343574","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343574","url":null,"abstract":"This paper presents a flexible broadband power divider based on defect compensation that works in the 3-12GHz frequency band. In the design, the cascaded multi-section impedance converter is employed to expand the working bandwidth, at the same time, additional capacitance and inductance are introduced through the defective ground structure (DGS) to compensate for the performance of the splitter caused by bending. This paper analyzes the transmission characteristics of the flexible power divider in different directions and at different angles through numerical calculation and modeling simulation. The results show that the proposed compensation design scheme achieves a maximum insertion loss of -3.1dB within 3-12GHz, the flatness of the most in-band is less than 0.7dB, the isolation is <-15 dB. Finally, a prototype is fabricated and tested to verify the design method.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"3 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":"131044410","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/NEMO49486.2020.9343567
Yanlei Du, Jian Yang, Shurun Tan, Xiaofeng Yang, J. Wang, Wenting Ma
The effects of roughness scale on bistatic radar scattering from an ocean surface at L-band are studied using the second order small slope approximation (SSA-II) and the method of moments (MoM). Ocean roughness is represented and varied using different ranges of the KHCC03 spectrum. The criteria of full spectrum truncation are also given. Numerical results are illustrated in fully bistatic configuration at 1.26 GHz. Simulations indicate that short waves with wavenumber larger than 316 rad/m (around 12 wavenumbers of L-band incidence wave) have little effect on ocean scattering. The large-scale waves put more impacts on scattering in the forward directions, especially for large incidence angles. The effects of large-scale roughness on ocean scattering are in general smaller at VV-pol than HH-pol. The bistatic scattering at cross polarizations is less sensitive to the roughness scale as compared to the co-polarizations. For numerical simulations of ocean scattering with incidence angle less than 60°, using small surface profiles with size about 1/6 of those accounting for full spectrum yields results of bistatic scattering coefficients with errors less than 2dB.
{"title":"Numerical Simulations of Roughness Scale Effects on Bistatic Ocean Scattering","authors":"Yanlei Du, Jian Yang, Shurun Tan, Xiaofeng Yang, J. Wang, Wenting Ma","doi":"10.1109/NEMO49486.2020.9343567","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343567","url":null,"abstract":"The effects of roughness scale on bistatic radar scattering from an ocean surface at L-band are studied using the second order small slope approximation (SSA-II) and the method of moments (MoM). Ocean roughness is represented and varied using different ranges of the KHCC03 spectrum. The criteria of full spectrum truncation are also given. Numerical results are illustrated in fully bistatic configuration at 1.26 GHz. Simulations indicate that short waves with wavenumber larger than 316 rad/m (around 12 wavenumbers of L-band incidence wave) have little effect on ocean scattering. The large-scale waves put more impacts on scattering in the forward directions, especially for large incidence angles. The effects of large-scale roughness on ocean scattering are in general smaller at VV-pol than HH-pol. The bistatic scattering at cross polarizations is less sensitive to the roughness scale as compared to the co-polarizations. For numerical simulations of ocean scattering with incidence angle less than 60°, using small surface profiles with size about 1/6 of those accounting for full spectrum yields results of bistatic scattering coefficients with errors less than 2dB.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"2 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":"127221206","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：