Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368628
Yu Zhang, Jia-qing Chen, Man-tang Su, Yue-Qi Han, Yingqiang Wang, Jie Yang
Due to the non-directional of the single-station electric-field monitor, single-station electric-field monitor needs to be improved by using the networking atmosphere electric-field monitors. We used the networking atmosphere electric-field data and put forward a method that can solve the problem the single-station electric-field monitor has. Quartic spline interpolation is used as the method and it can transform the 2 dimension data to 3 dimension data and we can get the map of the electric-field. Then we used the radar echo data to prove its effectiveness. The results show that: (1) Comparing to other interpolation method quartic spline interpolation is better when considering the relation of each station, electric network system enhanced the function of atmospheric electric field instrument and expand the monitoring scope of the electric-field. (2) Radar echo proves that the center of radar echo and the map of the electric-field don't coincide well. (3) Intensity of the radar echo and the electric-field has positive correlation.
{"title":"The forecasting method of thundercloud electric-field based on the data of networking atmosphere electric-field","authors":"Yu Zhang, Jia-qing Chen, Man-tang Su, Yue-Qi Han, Yingqiang Wang, Jie Yang","doi":"10.1109/CEEM.2015.7368628","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368628","url":null,"abstract":"Due to the non-directional of the single-station electric-field monitor, single-station electric-field monitor needs to be improved by using the networking atmosphere electric-field monitors. We used the networking atmosphere electric-field data and put forward a method that can solve the problem the single-station electric-field monitor has. Quartic spline interpolation is used as the method and it can transform the 2 dimension data to 3 dimension data and we can get the map of the electric-field. Then we used the radar echo data to prove its effectiveness. The results show that: (1) Comparing to other interpolation method quartic spline interpolation is better when considering the relation of each station, electric network system enhanced the function of atmospheric electric field instrument and expand the monitoring scope of the electric-field. (2) Radar echo proves that the center of radar echo and the map of the electric-field don't coincide well. (3) Intensity of the radar echo and the electric-field has positive correlation.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116371011","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368713
Tao Wang, Li-hua Shi, Fei Guo
In this paper, a three dimensions (3D) numerical simulation model to analyze time reversal applications in lightning location is presented. In this simulation model, more practical situation is considered, and a square array which consists of four monopole antennas is set. The simulation shows that the time reversed fields will converge on the lightning strike location in phase at proper time step. But when a special situation is considered that the lightning location is beside the sensor array, it is hard to observe the exact time accurately because there will always be a convergence point appearing at every time step. In this paper, it is unnecessary to estimate “the proper time”. What we have to do is to add an array. And then, track the different locating paths of the these arrays to the lightning location. The intersection of these paths is the location point. Considering different situations, it is better to set three arrays to ensure the lightning discharge is located successfully, and make the arrays not on the same line. With the results of this simulation model being presented, the time-reversed technique is shown to be accurate.
{"title":"Lightning location with time reversal of electromagnetic fields technique","authors":"Tao Wang, Li-hua Shi, Fei Guo","doi":"10.1109/CEEM.2015.7368713","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368713","url":null,"abstract":"In this paper, a three dimensions (3D) numerical simulation model to analyze time reversal applications in lightning location is presented. In this simulation model, more practical situation is considered, and a square array which consists of four monopole antennas is set. The simulation shows that the time reversed fields will converge on the lightning strike location in phase at proper time step. But when a special situation is considered that the lightning location is beside the sensor array, it is hard to observe the exact time accurately because there will always be a convergence point appearing at every time step. In this paper, it is unnecessary to estimate “the proper time”. What we have to do is to add an array. And then, track the different locating paths of the these arrays to the lightning location. The intersection of these paths is the location point. Considering different situations, it is better to set three arrays to ensure the lightning discharge is located successfully, and make the arrays not on the same line. With the results of this simulation model being presented, the time-reversed technique is shown to be accurate.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123612235","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368706
Mingxin Du, Ying-hui Zhou, Li-hua Shi, Liang Chen
Numerical simulation method is a simple but effective method in the study of the damage behavior of carbon fiber reinforced polymer (CFRP) caused by lightning strike. A method to evaluate the internal damage area of CFRP is developed in this paper by superposing the temperature field of each layer, and damage effects of two kinds of CFRPs caused by different types of lightning currents are investigated based on finite element method. The results show that action integral has a great affection on damage results, and the types of the lightning currents may slightly influence the propagation of the temperature along the thickness direction. Internal damage area will keep equal when the action integral of the lightning currents is the same.
{"title":"Study of action integral affecting the direct effects of lightning strike on CFRP","authors":"Mingxin Du, Ying-hui Zhou, Li-hua Shi, Liang Chen","doi":"10.1109/CEEM.2015.7368706","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368706","url":null,"abstract":"Numerical simulation method is a simple but effective method in the study of the damage behavior of carbon fiber reinforced polymer (CFRP) caused by lightning strike. A method to evaluate the internal damage area of CFRP is developed in this paper by superposing the temperature field of each layer, and damage effects of two kinds of CFRPs caused by different types of lightning currents are investigated based on finite element method. The results show that action integral has a great affection on damage results, and the types of the lightning currents may slightly influence the propagation of the temperature along the thickness direction. Internal damage area will keep equal when the action integral of the lightning currents is the same.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124816423","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368630
D. Giri
The first atomic test took place in Alamogordo, NM, USA on July 16, 1945, Nobel laureate physicist Enrico Fermi tried to calculate the possible electromagnetic fields that would be produced from the nuclear explosion. This can be considered as the birth of the study of HPEM. HPEM is a comprehensive acronym to include EM waveforms such as natural lightning, nuclear electromagnetic pulse (NEMP, High-Power Microwaves(HPM) etc. [D. V. Giri and F. M. Tesche, “Classification of Intentional Electromagnetic Environments” (IEME), IEEE Trans. EMC, Aug. 200]
{"title":"History of high-power electromagnetics (HPEM) from 1940s to 21st century","authors":"D. Giri","doi":"10.1109/CEEM.2015.7368630","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368630","url":null,"abstract":"The first atomic test took place in Alamogordo, NM, USA on July 16, 1945, Nobel laureate physicist Enrico Fermi tried to calculate the possible electromagnetic fields that would be produced from the nuclear explosion. This can be considered as the birth of the study of HPEM. HPEM is a comprehensive acronym to include EM waveforms such as natural lightning, nuclear electromagnetic pulse (NEMP, High-Power Microwaves(HPM) etc. [D. V. Giri and F. M. Tesche, “Classification of Intentional Electromagnetic Environments” (IEME), IEEE Trans. EMC, Aug. 200]","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122696579","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368646
Yan-xin Li, Yun Li, Li-hua Shi, Shi Qiu
At the time of sounding of static electric field, measuring devices can not be rested on the ground, which are suspended in the air. To study the relationship between corona current and electric field in the air, current detection unit with probe suspended in the vertical electric field has been tested in the laboratory. The experimental results show that probes suspended in a vertical electric field can still generate corona discharge and the waveform of corona impulse current is double exponential wave and the peak value of corona impulse current can reach milliampere level. Furthermore, the distance between current probes and the upper electrode plate makes a difference in onset voltage of corona discharge. The value of onset voltage decreases with decreasing the distance. By calibrating shorter probes, it was established that the waveform of corona current suspended in a vertical electric field is the same as that of a singlepointed probe resting on and perpendicular to a flat plane ground electrode. However, to the longer probes, the closer distance between current detection unit and the upper electrode plate is, the larger the waveform of corona current will change. With the limit of test space, the upper electrode plate has great influences on the waveform of corona impulse current.
{"title":"Study on corona current measurement with probe suspended in the vertical static electric field","authors":"Yan-xin Li, Yun Li, Li-hua Shi, Shi Qiu","doi":"10.1109/CEEM.2015.7368646","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368646","url":null,"abstract":"At the time of sounding of static electric field, measuring devices can not be rested on the ground, which are suspended in the air. To study the relationship between corona current and electric field in the air, current detection unit with probe suspended in the vertical electric field has been tested in the laboratory. The experimental results show that probes suspended in a vertical electric field can still generate corona discharge and the waveform of corona impulse current is double exponential wave and the peak value of corona impulse current can reach milliampere level. Furthermore, the distance between current probes and the upper electrode plate makes a difference in onset voltage of corona discharge. The value of onset voltage decreases with decreasing the distance. By calibrating shorter probes, it was established that the waveform of corona current suspended in a vertical electric field is the same as that of a singlepointed probe resting on and perpendicular to a flat plane ground electrode. However, to the longer probes, the closer distance between current detection unit and the upper electrode plate is, the larger the waveform of corona current will change. With the limit of test space, the upper electrode plate has great influences on the waveform of corona impulse current.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122675657","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368686
Ji Haiying, Gao You-gang, Zhang Dan, Wang Chen
In this Paper firstly, the CSE (Conducted Spurious Emission) problem induced by shielding can in smart mobile phone design is experimentally analyzed, and the feasible solution is found. Then, the elements of circuits, which can be influenced by shielding can in smart mobile phone are classified into two categories, and they are the components and the micro-strip line. At last, by method of CST simulation the influence from shielding can's top face and wall to impedance of micro-strip line is further studied, and the guidelines for micro-strip line design to avoid shielding can's influence are also given.
{"title":"Study on the CSE problem induced by shielding can during smart mobile phone design","authors":"Ji Haiying, Gao You-gang, Zhang Dan, Wang Chen","doi":"10.1109/CEEM.2015.7368686","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368686","url":null,"abstract":"In this Paper firstly, the CSE (Conducted Spurious Emission) problem induced by shielding can in smart mobile phone design is experimentally analyzed, and the feasible solution is found. Then, the elements of circuits, which can be influenced by shielding can in smart mobile phone are classified into two categories, and they are the components and the micro-strip line. At last, by method of CST simulation the influence from shielding can's top face and wall to impedance of micro-strip line is further studied, and the guidelines for micro-strip line design to avoid shielding can's influence are also given.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128640852","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368697
Masayasu Ohira, D. Anzai, Jianqing Wang
Quasi-electrostatic field on car body surface is considered to be more useful as an in-vehicle communication means, compared with wireless communication and wire harness communication. In this study, we numerically calculated the propagation characteristics on a car body surface for the electric field communication and 2.4 GHz wireless communication, respectively, and showed that the former is more effective to pass through a slit hole in a lower path loss. Moreover, we also expressed the transmitting electrode, the car body and the receiving electrode with an equivalent circuit in view of their near-field coupling characteristic, and yielded the matching impedances of the transmitting and receiving electrodes in order to improve transmission effectiveness.
{"title":"Propagation characteristic analysis and improvemnet for in-vehicle electric field communication","authors":"Masayasu Ohira, D. Anzai, Jianqing Wang","doi":"10.1109/CEEM.2015.7368697","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368697","url":null,"abstract":"Quasi-electrostatic field on car body surface is considered to be more useful as an in-vehicle communication means, compared with wireless communication and wire harness communication. In this study, we numerically calculated the propagation characteristics on a car body surface for the electric field communication and 2.4 GHz wireless communication, respectively, and showed that the former is more effective to pass through a slit hole in a lower path loss. Moreover, we also expressed the transmitting electrode, the car body and the receiving electrode with an equivalent circuit in view of their near-field coupling characteristic, and yielded the matching impedances of the transmitting and receiving electrodes in order to improve transmission effectiveness.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128502338","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}
As a special kind of electromagnetic interference, the transient electromagnetic pulse has strong destructive effects, which are serious threat to the safety of aerospace system. On the basic of three elements of electromagnetic interference, the protection factors of electromagnetic pulse of aerospace system were analyzed, and the protection methods were discussed in the paper.
{"title":"Discussion on transient electromagnetic pulse protection methods of aerospace system","authors":"Ping Zhou, Yinghua Lv, Yongsheng Song, Zhihong Chen","doi":"10.1109/CEEM.2015.7368716","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368716","url":null,"abstract":"As a special kind of electromagnetic interference, the transient electromagnetic pulse has strong destructive effects, which are serious threat to the safety of aerospace system. On the basic of three elements of electromagnetic interference, the protection factors of electromagnetic pulse of aerospace system were analyzed, and the protection methods were discussed in the paper.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116003123","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368673
Zhu Yichao, Zheng Shoujun, Pang Shenghan, Wu Sang
Rotating parabolic reflector antenna combined with parachute is designed to have a parachute-type high power EMP radiator. With EM array complementary radiation as the design idea, a four-feed-arm parachute-type reflector antenna structure with higher feeding efficiency is proposed, thus to strengthen the low-frequency radiating capacity, widen the bandwidth of antenna and improve the radiant efficiency of antenna; a balanced feeding structure is also adopted to strengthen the radiating capacity. The results showed that parachute-type radiator is superior to TEM horn antenna in both peak-to-peak value of field strength and effective bandwidth of radiation field, thus making effective radiation of high-power UWB-EMP come true.
{"title":"Simulation study on parachute-type high power EMP radiator","authors":"Zhu Yichao, Zheng Shoujun, Pang Shenghan, Wu Sang","doi":"10.1109/CEEM.2015.7368673","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368673","url":null,"abstract":"Rotating parabolic reflector antenna combined with parachute is designed to have a parachute-type high power EMP radiator. With EM array complementary radiation as the design idea, a four-feed-arm parachute-type reflector antenna structure with higher feeding efficiency is proposed, thus to strengthen the low-frequency radiating capacity, widen the bandwidth of antenna and improve the radiant efficiency of antenna; a balanced feeding structure is also adopted to strengthen the radiating capacity. The results showed that parachute-type radiator is superior to TEM horn antenna in both peak-to-peak value of field strength and effective bandwidth of radiation field, thus making effective radiation of high-power UWB-EMP come true.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115569678","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 : 2015-11-01DOI: 10.1109/CEEM.2015.7368624
Hong Rentang, Shi Lihua, Qiu Shi, Zhou Yinghui
A low-profile antenna with end-fire radiation and vertical polarization is presented in this paper. It employs a top-open dielectric-filled waveguide to propagate the electromagnetic waves, which is radiated by gradually deducing the height of the waveguide. The proposed antenna has a low profile of 0.1λL (λL is the wavelength at the lowest operating frequency), and is embedded in a large ground plane. Simulation results show that a fractional impedance bandwidth of 23.6%, a maximum gain of 8.4 dBi, and an end-fire radiation is achieved, indicating that the antenna should be useful in airborne and vehicle platforms. The antenna has a width much less than a wavelength, showing the capability of being an array element for higher directivity and beam steering at the end-fire direction.
{"title":"A novel low-profile antenna with end-fire radiation","authors":"Hong Rentang, Shi Lihua, Qiu Shi, Zhou Yinghui","doi":"10.1109/CEEM.2015.7368624","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368624","url":null,"abstract":"A low-profile antenna with end-fire radiation and vertical polarization is presented in this paper. It employs a top-open dielectric-filled waveguide to propagate the electromagnetic waves, which is radiated by gradually deducing the height of the waveguide. The proposed antenna has a low profile of 0.1λL (λL is the wavelength at the lowest operating frequency), and is embedded in a large ground plane. Simulation results show that a fractional impedance bandwidth of 23.6%, a maximum gain of 8.4 dBi, and an end-fire radiation is achieved, indicating that the antenna should be useful in airborne and vehicle platforms. The antenna has a width much less than a wavelength, showing the capability of being an array element for higher directivity and beam steering at the end-fire direction.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125747052","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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