Pub Date : 2018-03-01DOI: 10.1109/COMPEM.2018.8496612
Haoran Li, D. Moisseev, A. von Lerber
Dual-polarization radar variables, such as differential reflectivity $(mathrm{Z}_{mathrm{dr}})$, are simulated from observed microphysical property of snowflakes. The increases of particle mass and aspect ratio are found to have opposite effects on $mathrm{Z}_{mathrm{dr}}$, This contradictory effect is different in various riming condition. The results of simulation were adopted to interpret radar observations, which are found to agree with the current hypothesis of riming process.
{"title":"Dual-Polarization Radar Signatures of Rimed Snowflakes","authors":"Haoran Li, D. Moisseev, A. von Lerber","doi":"10.1109/COMPEM.2018.8496612","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496612","url":null,"abstract":"Dual-polarization radar variables, such as differential reflectivity $(mathrm{Z}_{mathrm{dr}})$, are simulated from observed microphysical property of snowflakes. The increases of particle mass and aspect ratio are found to have opposite effects on $mathrm{Z}_{mathrm{dr}}$, This contradictory effect is different in various riming condition. The results of simulation were adopted to interpret radar observations, which are found to agree with the current hypothesis of riming process.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122583637","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.2018.8496622
Zhaoyang Qiu, Jun Zhu, Fang Li
The electromagnetic environment is becoming increasingly complex and the non-cooperative radar receiver will intercept the multiple concurrent radar signals. The binary phase shift keying/linear frequency modulated (BPSK/LFM) hybrid modulated signal is a novel kind of low probability of intercept (LPI) signal. In this paper, a new parameter estimation method is proposed for the multiple BPSK/LFM signals. The squaring process and fractional Fourier transform are used to estimate the chirp rate. Then, the output signal to interference plus noise ratio (SINR) is analyzed. Finally, the code rate estimation is given based on the linear transformation. Numerical simulation results show the efficacy of the proposed method and the correctness of the analysis.
{"title":"Multiple BPSK/LFM Hybrid Modulated Signals Parameter Estimation and Analysis Intercepted by Non-Cooperative Radar Receiver","authors":"Zhaoyang Qiu, Jun Zhu, Fang Li","doi":"10.1109/COMPEM.2018.8496622","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496622","url":null,"abstract":"The electromagnetic environment is becoming increasingly complex and the non-cooperative radar receiver will intercept the multiple concurrent radar signals. The binary phase shift keying/linear frequency modulated (BPSK/LFM) hybrid modulated signal is a novel kind of low probability of intercept (LPI) signal. In this paper, a new parameter estimation method is proposed for the multiple BPSK/LFM signals. The squaring process and fractional Fourier transform are used to estimate the chirp rate. Then, the output signal to interference plus noise ratio (SINR) is analyzed. Finally, the code rate estimation is given based on the linear transformation. Numerical simulation results show the efficacy of the proposed method and the correctness of the analysis.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129303963","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.2018.8496708
M. Huang, Yongzhi Cheng
We present a photo-excited tunable terahertz matematerial absorber (MMA) with polarization-insensitive and wide-angle absorption. The MMA is a periodic array consisted of dielectric layer sandwiched with continue metal film and meander split-rings., where light-sensitive silicon (LSS) chip is embedded in four gaps of split-ring. Since the conductivity of LSS is sensitive for laser light power., the tunable function is easy to achieve for this MMA. The numerical simulations demonstrate that the absorption peak frequency of the designed MMA is varied from O.615THz to O.321THz by modulated LSS. In addition., the relative modulation bandwidth and absorption depth are 62.67% and 49.59%., respectively. Further simulations indicate that the MMA has polarization-insensitive and wide-angle absorption for both TE and TM modes.
{"title":"Design of a Photo-Excited Tunable Metamaterial Absorber with Polarization-Insensitive and Wide-Angle Absorption in Terahertz Regime","authors":"M. Huang, Yongzhi Cheng","doi":"10.1109/COMPEM.2018.8496708","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496708","url":null,"abstract":"We present a photo-excited tunable terahertz matematerial absorber (MMA) with polarization-insensitive and wide-angle absorption. The MMA is a periodic array consisted of dielectric layer sandwiched with continue metal film and meander split-rings., where light-sensitive silicon (LSS) chip is embedded in four gaps of split-ring. Since the conductivity of LSS is sensitive for laser light power., the tunable function is easy to achieve for this MMA. The numerical simulations demonstrate that the absorption peak frequency of the designed MMA is varied from O.615THz to O.321THz by modulated LSS. In addition., the relative modulation bandwidth and absorption depth are 62.67% and 49.59%., respectively. Further simulations indicate that the MMA has polarization-insensitive and wide-angle absorption for both TE and TM modes.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126499210","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.2018.8496501
R. Gao, Z. Su, M. Tong
Reconstruction of dielectric objects by integral equation approach requires to alternatively solve the forward scattering integral equation (FSIE) and inverse scattering integral equation (ISIE) in the frame of Born iterative method (BIM) or distorted BIM (DBIM). Solving the FSIE is very tedious because an intensive calculation of volume integrals over imaging domain is required. In this work, we use a novel meshless scheme to simplify the calculation of volume integrals in the solution of FSIE so that the reconstruction can be accelerated. The meshless scheme changes the volume integrals into boundary integrals through the Green-Gauss theorem after the integrands are regularized in the imaging domain and the volumetric discretization of the imaging domain is not necessary. The ISIE is solved by the Gauss-Newton minimization approach (GNMA) with the multiplicative regularization method (MRM). A typical numerical example is presented to demonstrate the inversion approach and good results have been obtained.
{"title":"Reconstruction of Dielectric Objects Based on Meshless Discretization of Imaging Domain","authors":"R. Gao, Z. Su, M. Tong","doi":"10.1109/COMPEM.2018.8496501","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496501","url":null,"abstract":"Reconstruction of dielectric objects by integral equation approach requires to alternatively solve the forward scattering integral equation (FSIE) and inverse scattering integral equation (ISIE) in the frame of Born iterative method (BIM) or distorted BIM (DBIM). Solving the FSIE is very tedious because an intensive calculation of volume integrals over imaging domain is required. In this work, we use a novel meshless scheme to simplify the calculation of volume integrals in the solution of FSIE so that the reconstruction can be accelerated. The meshless scheme changes the volume integrals into boundary integrals through the Green-Gauss theorem after the integrands are regularized in the imaging domain and the volumetric discretization of the imaging domain is not necessary. The ISIE is solved by the Gauss-Newton minimization approach (GNMA) with the multiplicative regularization method (MRM). A typical numerical example is presented to demonstrate the inversion approach and good results have been obtained.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123006761","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.2018.8496458
Z. Wen, Qi Wu
Characteristic mode analysis (CMA) is applied mostly in the frequency domain. In this paper, a time domain CMA is proposed based on the data of modal self-and mutual-admittance in the frequency domain. An algorithm is developed to compute the time domain CMA using IFFT, extrapolation and Hilbert Transformation. This time domain CMA is suitable for transmission and coupling problems, in which it represents the modal unit impulse response on specified ports. A parallel line and dipole antennas are computed for verification. For parallel line, time domain CMA is similar as the common and differential modes. For dipole antennas, the results are interesting to observe. The presented theory expands the areas of traditional CMA.
{"title":"Time Domain Characteristic Mode Theory for Transmission and Coupling Problems","authors":"Z. Wen, Qi Wu","doi":"10.1109/COMPEM.2018.8496458","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496458","url":null,"abstract":"Characteristic mode analysis (CMA) is applied mostly in the frequency domain. In this paper, a time domain CMA is proposed based on the data of modal self-and mutual-admittance in the frequency domain. An algorithm is developed to compute the time domain CMA using IFFT, extrapolation and Hilbert Transformation. This time domain CMA is suitable for transmission and coupling problems, in which it represents the modal unit impulse response on specified ports. A parallel line and dipole antennas are computed for verification. For parallel line, time domain CMA is similar as the common and differential modes. For dipole antennas, the results are interesting to observe. The presented theory expands the areas of traditional CMA.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124551256","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.2018.8496498
X. Bo, Jian Feng Zhang, T. Cui
Corner singularity in this paper for finite-difference time-domain (FDTD) method indicates the incorrect conformal area computed from the intersection information by ray tracing for tangential situation. Tangential situation originates from a mesh line aligning on an aligned plane, which leads to the fuzzification of intersection length along Yee grid edge. The intersection position of two perpendicular aligned planes or an aligned plane with arbitrary plane is the position of possible corner singularity, from which the incorrect computed conformal area may result. A universal scheme to solve the corner singularity problem is proposed. By utilizing the in or out information normal to the tangential plane, as well as cell position relation relative to the tangential plane, we can determine whether or not to modify the length of the tangential side of Yee cell for computing the conformal area. A simple numerical example of a hollow rectangular waveguide shows the necessity for handling corner singularity.
{"title":"Investigation of Corner Singularity in Conformal FDTD Structured Mesh Generation Based on Ray Tracing","authors":"X. Bo, Jian Feng Zhang, T. Cui","doi":"10.1109/COMPEM.2018.8496498","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496498","url":null,"abstract":"Corner singularity in this paper for finite-difference time-domain (FDTD) method indicates the incorrect conformal area computed from the intersection information by ray tracing for tangential situation. Tangential situation originates from a mesh line aligning on an aligned plane, which leads to the fuzzification of intersection length along Yee grid edge. The intersection position of two perpendicular aligned planes or an aligned plane with arbitrary plane is the position of possible corner singularity, from which the incorrect computed conformal area may result. A universal scheme to solve the corner singularity problem is proposed. By utilizing the in or out information normal to the tangential plane, as well as cell position relation relative to the tangential plane, we can determine whether or not to modify the length of the tangential side of Yee cell for computing the conformal area. A simple numerical example of a hollow rectangular waveguide shows the necessity for handling corner singularity.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129215020","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.2018.8496676
Wang Xiaoliang, Han Zhi
A multi-band monopole antenna is proposed in this paper. The antenna consists of a parasitic M-strip and an elliptical slot etched in the ground. With the help of the parasitic M-strip and the slot, the Y-shaped monopole antenna can easily obtain multi-band characteristics. The proposed antenna has been constructed and tested. The simulation is identical to the theoretical result. The simulated and tested results show that the proposed antenna impedance bandwidths make it easily cover the required bandwidths for PCS band, and WLAN band applications. The results also show the better comprehensiveness at the H plane.
{"title":"A Multi-Band Monopole Antenna with a Parasitic M-Strip for PCS and WLAN Applications","authors":"Wang Xiaoliang, Han Zhi","doi":"10.1109/COMPEM.2018.8496676","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496676","url":null,"abstract":"A multi-band monopole antenna is proposed in this paper. The antenna consists of a parasitic M-strip and an elliptical slot etched in the ground. With the help of the parasitic M-strip and the slot, the Y-shaped monopole antenna can easily obtain multi-band characteristics. The proposed antenna has been constructed and tested. The simulation is identical to the theoretical result. The simulated and tested results show that the proposed antenna impedance bandwidths make it easily cover the required bandwidths for PCS band, and WLAN band applications. The results also show the better comprehensiveness at the H plane.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115962601","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.2018.8496464
Xiaoyu Han, H. Hou, Junhong Wang
In this paper, FDTD method is used to study the propagation property of electromagnetic waves in the F1 layer of ionosphere in which the distribution of plasmas is known. All the important parameters about the ionosphere used in this paper are got from International Reference Ionosphere 2016. The results are in good agreement with theoretical solutions in the similar studies, indicating that the proposed method is accurate and efficient in predicting the wave propagation in ionospheric plasmas.
{"title":"Study on the Propagation Property of Radio Wave in $F_{1}$ Layer of the Ionosphere","authors":"Xiaoyu Han, H. Hou, Junhong Wang","doi":"10.1109/COMPEM.2018.8496464","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496464","url":null,"abstract":"In this paper, FDTD method is used to study the propagation property of electromagnetic waves in the F1 layer of ionosphere in which the distribution of plasmas is known. All the important parameters about the ionosphere used in this paper are got from International Reference Ionosphere 2016. The results are in good agreement with theoretical solutions in the similar studies, indicating that the proposed method is accurate and efficient in predicting the wave propagation in ionospheric plasmas.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114436145","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.2018.8496486
Jian Wang, Wei-Bing Lu, Zhengguo Liu
This paper presents a hybrid graphene-metal IFA antenna with dynamically tunable operating frequency. A small piece of single-layer graphene is used to connect with metal structure. This paper shows that the operating frequency of the antenna with special structure can be dynamically tuned by changing the surface resistance of single-layer graphene. The operating frequency of the antenna can be changed from Ll band of Global Positioning System to B3 band of BeiDou Navigation Satellite System.
{"title":"A Hybrid Graphene-Metal IFA Antenna with Dynamically Tunable Operating Frequency at Microwave Freauencies","authors":"Jian Wang, Wei-Bing Lu, Zhengguo Liu","doi":"10.1109/COMPEM.2018.8496486","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496486","url":null,"abstract":"This paper presents a hybrid graphene-metal IFA antenna with dynamically tunable operating frequency. A small piece of single-layer graphene is used to connect with metal structure. This paper shows that the operating frequency of the antenna with special structure can be dynamically tuned by changing the surface resistance of single-layer graphene. The operating frequency of the antenna can be changed from Ll band of Global Positioning System to B3 band of BeiDou Navigation Satellite System.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127825433","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.2018.8496595
F. Lin, Qian Cui
This talk will present our recent work on reconfigurable crossovers for applications in wideband reconfigurable radio systems. The design of microstrip and half-mode substrate integrated waveguide (HMSIW) reconfigurable crossovers is shown. The microstrip crossover is tuned from 1.29 to 2.06 GHz. Its size is reduced by 92% compared with the conventional two-section branch-line crossover. The measured HMSIW crossover is tuned from 2.2 to 5.0 GHz.
{"title":"Design of Reconfigurable Crossovers","authors":"F. Lin, Qian Cui","doi":"10.1109/COMPEM.2018.8496595","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496595","url":null,"abstract":"This talk will present our recent work on reconfigurable crossovers for applications in wideband reconfigurable radio systems. The design of microstrip and half-mode substrate integrated waveguide (HMSIW) reconfigurable crossovers is shown. The microstrip crossover is tuned from 1.29 to 2.06 GHz. Its size is reduced by 92% compared with the conventional two-section branch-line crossover. The measured HMSIW crossover is tuned from 2.2 to 5.0 GHz.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127115063","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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