Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634146
Zhiwei Zhang, Guohua Liu, Hao Sun, Zhi-qun Cheng
This paper presents a new method to design broadband high efficiency Class-J power amplifiers (JPAs). The wideband output matching network (OMN) is designed with a new simplified output impedance calculation method by using a two-port network. For demonstration, a broadband high efficient Class-J power amplifier based on proposed method is implemented using Cree 10-W packaged GaN HEMT devices. Measurement results show that 64%-68% drain efficiency is achieved and between 40-41.6 dBm output power with more than 10 dB gain over the frequency band of 1.2-2.6 GHz, the proposed amplifier has an ACPR between - 27.5 and −32.4 dBc over the entire band.
{"title":"A Broadband High Efficiency Class-J Power Amplifier with a Novel Output Matching Method","authors":"Zhiwei Zhang, Guohua Liu, Hao Sun, Zhi-qun Cheng","doi":"10.1109/ISAPE.2018.8634146","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634146","url":null,"abstract":"This paper presents a new method to design broadband high efficiency Class-J power amplifiers (JPAs). The wideband output matching network (OMN) is designed with a new simplified output impedance calculation method by using a two-port network. For demonstration, a broadband high efficient Class-J power amplifier based on proposed method is implemented using Cree 10-W packaged GaN HEMT devices. Measurement results show that 64%-68% drain efficiency is achieved and between 40-41.6 dBm output power with more than 10 dB gain over the frequency band of 1.2-2.6 GHz, the proposed amplifier has an ACPR between - 27.5 and −32.4 dBc over the entire band.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122016443","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 : 2018-12-01DOI: 10.1109/isape.2018.8634364
Fuling Zhao, Yongjun Wang, Shaolin He
There are different interferences in the satellite communication. A example is given in the paper, it is shown from the simulation that when using smart antenna and PASTd algorithm in the satellite communication, the radiation patterns formed by smart antenna points a main beam in the direction of the desired signal but the ability to cancel inferences.
{"title":"Constraining interference in satellite reception and ground station receiver","authors":"Fuling Zhao, Yongjun Wang, Shaolin He","doi":"10.1109/isape.2018.8634364","DOIUrl":"https://doi.org/10.1109/isape.2018.8634364","url":null,"abstract":"There are different interferences in the satellite communication. A example is given in the paper, it is shown from the simulation that when using smart antenna and PASTd algorithm in the satellite communication, the radiation patterns formed by smart antenna points a main beam in the direction of the desired signal but the ability to cancel inferences.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116945873","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634116
Min Zhang, Lianyan Zhu
In the analysis of electromagnetic characters around the buildings, the effects of ground are non-ignorable. To solve the problem, a half-space FDTD method with nonuniform meshes is proposed in this paper. Two 1-D modified FDTD equations have been employed to set TF/SF boundary of the infinite half-space electromagnetic problems, then the half space problem can be solved in finite space. A method with non-uniform meshes is applied to reduce the calculation time and meshes of the building with an electrically large structure. Finally, the electromagnetic fields in Building which illuminated by the airborne antenna array is analysed.
{"title":"Analysis of Electromagnetic Distribution in Building Illuminated with Airborne Antenna Array by Using a Half-space FDTD","authors":"Min Zhang, Lianyan Zhu","doi":"10.1109/ISAPE.2018.8634116","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634116","url":null,"abstract":"In the analysis of electromagnetic characters around the buildings, the effects of ground are non-ignorable. To solve the problem, a half-space FDTD method with nonuniform meshes is proposed in this paper. Two 1-D modified FDTD equations have been employed to set TF/SF boundary of the infinite half-space electromagnetic problems, then the half space problem can be solved in finite space. A method with non-uniform meshes is applied to reduce the calculation time and meshes of the building with an electrically large structure. Finally, the electromagnetic fields in Building which illuminated by the airborne antenna array is analysed.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116951837","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634140
Wei Chen, Yuanchao Yang, Hao Li
This paper deals with a new trajectory optimization modeling and algorithm for the integrated scheduling of multiple aircraft under the complex electronic warfare environment. With the cooperative flying formation of the fighter aircraft and electronic warfare aircraft, the proposed modeling and algorithm can help the flight team fulfill an optimal mission accomplishment. The effectiveness of the modeling and algorithm is demonstrated by the corresponding test case.
{"title":"Integrated Trajectory Optimization of Multiple Aircraft under Electronic Warfare Environment","authors":"Wei Chen, Yuanchao Yang, Hao Li","doi":"10.1109/ISAPE.2018.8634140","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634140","url":null,"abstract":"This paper deals with a new trajectory optimization modeling and algorithm for the integrated scheduling of multiple aircraft under the complex electronic warfare environment. With the cooperative flying formation of the fighter aircraft and electronic warfare aircraft, the proposed modeling and algorithm can help the flight team fulfill an optimal mission accomplishment. The effectiveness of the modeling and algorithm is demonstrated by the corresponding test case.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115238748","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634278
Zepei Jiang, Fushun Zhang
A single feed broadband circularly polarized (CP) antenna is proposed. The antenna is composed of single feeding loop structure which provides sequential phase, four driven patches, and one parasitic patches. The driven patches, which are capacitively coupled by the feeding structure, generate one CP mode due to the sequentially rotated structure. One parasitic patch produces additional CP mode. By combining single feeding loop structure with four driven patches and one parasitic patch, the axial ratio (AR) bandwidth is greatly broadened. The results of the simulation show that the antenna achieves a broad impedance bandwidth of 20.7% (4.38–5.39 GHz) and a 3-dB AR bandwidth of 14.2% (4.65–5.36 GHz). In addition, the proposed antenna has a flat gain within the operating frequency band and a size of $boldsymbol{Phi} 0.97boldsymbol{lambda}_{0}times 0.15boldsymbol{lambda}_{0}$ at 5.0 GHz.
提出了一种单馈宽带圆极化(CP)天线。该天线由提供顺序相位的单馈电回路结构、四个驱动贴片和一个寄生贴片组成。驱动片由进给结构电容耦合，由于结构顺序旋转，产生一个CP模式。一个寄生补丁产生额外的CP模式。通过将单进给回路结构与四个驱动贴片和一个寄生贴片相结合，大大拓宽了轴比(AR)带宽。仿真结果表明，该天线具有20.7的宽阻抗带宽% (4.38–5.39 GHz) and a 3-dB AR bandwidth of 14.2% (4.65–5.36 GHz). In addition, the proposed antenna has a flat gain within the operating frequency band and a size of $boldsymbol{Phi} 0.97boldsymbol{lambda}_{0}times 0.15boldsymbol{lambda}_{0}$ at 5.0 GHz.
{"title":"Single Feed Broadband Circularly Polarized Antenna With Parasitic Patch","authors":"Zepei Jiang, Fushun Zhang","doi":"10.1109/ISAPE.2018.8634278","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634278","url":null,"abstract":"A single feed broadband circularly polarized (CP) antenna is proposed. The antenna is composed of single feeding loop structure which provides sequential phase, four driven patches, and one parasitic patches. The driven patches, which are capacitively coupled by the feeding structure, generate one CP mode due to the sequentially rotated structure. One parasitic patch produces additional CP mode. By combining single feeding loop structure with four driven patches and one parasitic patch, the axial ratio (AR) bandwidth is greatly broadened. The results of the simulation show that the antenna achieves a broad impedance bandwidth of 20.7% (4.38–5.39 GHz) and a 3-dB AR bandwidth of 14.2% (4.65–5.36 GHz). In addition, the proposed antenna has a flat gain within the operating frequency band and a size of $boldsymbol{Phi} 0.97boldsymbol{lambda}_{0}times 0.15boldsymbol{lambda}_{0}$ at 5.0 GHz.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121196698","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634126
Yali Hou, Hong Su, Bo Tian, Tie Li
Aiming at the fact that the narrow pulse laser transient characteristics of target have not been applied in target recognition, a hidden Markov model (HMM)based on transient characteristics is proposed. For the scattering characteristics of each target in different poses, the reliable model parameters of each target were completed by using the training samples, and each hidden Markov model was established. The maximum likelihood of the test samples for each model was calculated, the target feature class corresponding to the largest probability value was selected as the output category. The result shows that target recognition by hidden Markov model has better performance in terms of calculation speed and accuracy. This method is fast and effective.
{"title":"Hidden Markov Model Based on Target Narrow Pulse Laser Transient Characteristics","authors":"Yali Hou, Hong Su, Bo Tian, Tie Li","doi":"10.1109/ISAPE.2018.8634126","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634126","url":null,"abstract":"Aiming at the fact that the narrow pulse laser transient characteristics of target have not been applied in target recognition, a hidden Markov model (HMM)based on transient characteristics is proposed. For the scattering characteristics of each target in different poses, the reliable model parameters of each target were completed by using the training samples, and each hidden Markov model was established. The maximum likelihood of the test samples for each model was calculated, the target feature class corresponding to the largest probability value was selected as the output category. The result shows that target recognition by hidden Markov model has better performance in terms of calculation speed and accuracy. This method is fast and effective.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123871272","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634210
Jingxia Qiang, F. Xu, Wenjun Fan
A high isolation, high gain and compact patch antenna arrays that operates in 11.4–11.78 GHz by using fractal defected ground structure (Fractal-DGS) is designed. Performance of the antenna arrays, such as isolation and radiation, are simulated and compared with conventional patch antenna array without Fractal-DGS. As is presented in this paper, the mutual coupling is −33dB at working frequency, it reduces 13dB compared with the traditional antenna array. And the radiation direction is better than conventional antennas too. Higher isolation and stable directional radiation pattern make this antenna array a better choice for millimeter wave communication system.
{"title":"Reducing Mutual Coupling of Millimeter Wave Array Antennas by Fractal Defected Ground Structure","authors":"Jingxia Qiang, F. Xu, Wenjun Fan","doi":"10.1109/ISAPE.2018.8634210","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634210","url":null,"abstract":"A high isolation, high gain and compact patch antenna arrays that operates in 11.4–11.78 GHz by using fractal defected ground structure (Fractal-DGS) is designed. Performance of the antenna arrays, such as isolation and radiation, are simulated and compared with conventional patch antenna array without Fractal-DGS. As is presented in this paper, the mutual coupling is −33dB at working frequency, it reduces 13dB compared with the traditional antenna array. And the radiation direction is better than conventional antennas too. Higher isolation and stable directional radiation pattern make this antenna array a better choice for millimeter wave communication system.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123228069","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634384
Wei Sun, Pulong Nan
In this paper, a novel target motion analysis (TMA) method using unscented Kalman Filter (UKF) based on modified polar coordinates (MPC) is proposed to improve the localization accuracy for underwater target with constant velocity. The proposed approach utilizes bearings of two-arrays to estimate the localization and velocity of the target. Unlike extended Kalman filter, unscented Kalman Filter (UKF), which is biased and sensitive to the initial value in Cartesian coordinate, the proposed scheme is much more stable and asymptotically unbiased. Moreover, the performances among these schemes are compared based on the noisy bearings from towed array sonar and flank array sonar via Monte Carlo simulations. Simulation results show that the proposed MPC-UKF has better performances with higher numerical stability and little cost of computational complexity.
{"title":"A new TMA method for state estimation of underwater target","authors":"Wei Sun, Pulong Nan","doi":"10.1109/ISAPE.2018.8634384","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634384","url":null,"abstract":"In this paper, a novel target motion analysis (TMA) method using unscented Kalman Filter (UKF) based on modified polar coordinates (MPC) is proposed to improve the localization accuracy for underwater target with constant velocity. The proposed approach utilizes bearings of two-arrays to estimate the localization and velocity of the target. Unlike extended Kalman filter, unscented Kalman Filter (UKF), which is biased and sensitive to the initial value in Cartesian coordinate, the proposed scheme is much more stable and asymptotically unbiased. Moreover, the performances among these schemes are compared based on the noisy bearings from towed array sonar and flank array sonar via Monte Carlo simulations. Simulation results show that the proposed MPC-UKF has better performances with higher numerical stability and little cost of computational complexity.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123987478","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634039
Shihan Zhang, Yuhua Zou
The equatorial and low-latitude plasma depletions is an important space weather phenomenon, which often produce severe ionospheric scintillations. According to the well-known formation mechanism of the equatorial and low-latitude plasma depletions, i.e., the generalized Rayleigh-Taylor (RT) instability mechanism, these plasma depletions are expected to occur mainly at night and appear simultaneously at the geomagnetic conjugate locations in the northern and southern hemisphere. Although many studies on the equatorial and low-latitude plasma depletions have been performed in recent years, there are few reports on the variation features of the equatorial and low-latitude plasma depletions along the geomagnetic meridian direction. In this study, we have analyzed in situ electron density measurements obtained by the three Swarm satellites in the 55°E-155°E geographic longitude (GLON) sector during the equinox months of high solar activity years, i.e., February-April 2014, September-November 2014, February-April 2015, and September-November 2015. We found that the equatorial and low-latitude plasma depletions were observed mainly at night, which are consistent with the statements of the generalized RT instability mechanism. Moreover, we found that in most cases the appearance of the equatorial and low-latitude plasma depletions presented the north-south hemisphere symmetry. However, sometimes (with the occurrence rate of ∼16-27%) they presented the north-south hemisphere asymmetry, namely, they were only detected at the low-latitude region in the northern hemisphere or southern hemisphere, which cannot be explained by the generalized RT instability mechanism.
{"title":"Meridional Direction Features of Equatorial and Low-Latitude Plasma Depletions Observed by Swarm Satellites","authors":"Shihan Zhang, Yuhua Zou","doi":"10.1109/ISAPE.2018.8634039","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634039","url":null,"abstract":"The equatorial and low-latitude plasma depletions is an important space weather phenomenon, which often produce severe ionospheric scintillations. According to the well-known formation mechanism of the equatorial and low-latitude plasma depletions, i.e., the generalized Rayleigh-Taylor (RT) instability mechanism, these plasma depletions are expected to occur mainly at night and appear simultaneously at the geomagnetic conjugate locations in the northern and southern hemisphere. Although many studies on the equatorial and low-latitude plasma depletions have been performed in recent years, there are few reports on the variation features of the equatorial and low-latitude plasma depletions along the geomagnetic meridian direction. In this study, we have analyzed in situ electron density measurements obtained by the three Swarm satellites in the 55°E-155°E geographic longitude (GLON) sector during the equinox months of high solar activity years, i.e., February-April 2014, September-November 2014, February-April 2015, and September-November 2015. We found that the equatorial and low-latitude plasma depletions were observed mainly at night, which are consistent with the statements of the generalized RT instability mechanism. Moreover, we found that in most cases the appearance of the equatorial and low-latitude plasma depletions presented the north-south hemisphere symmetry. However, sometimes (with the occurrence rate of ∼16-27%) they presented the north-south hemisphere asymmetry, namely, they were only detected at the low-latitude region in the northern hemisphere or southern hemisphere, which cannot be explained by the generalized RT instability mechanism.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125323464","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 : 2018-12-01DOI: 10.1109/ISAPE.2018.8634388
T. Feng, Moran Liu, Chen Zhou
Parametric Decay Instability (PDI) plays an important role in the interaction of the high-power HF EM waves with ionosphere plasma. In this study, we have constructed a 2D numerical simulation model for studying PDI with a nearly realistic ionosphere background and a radio wave propagation model by taking a proper processing for the routine dynamic equations of plasma with generalized Zakharov method. The simulation results found that high-power HF EM waves could excite two electrostatic modes of a Langmuir wave and an ion acoustic wave near the reflection point of the ordinary wave (O-mode) within a timescale order of millisecond. The amplitude of density perturbation grows exponentially and significantly influencing the plasma frequency related to ‘low frequency’ density background. These processes are also followed by plasma caviton structures and trapped Langmuir waves. Finally, the O-mode heating leads to an intense localized turbulence. This paper also presents the simulation results of Langmuir parametric instability (LPI) excited by powerful HF wave heating at the O-mode reflection height. The study of this article contributes to formation of a deep impression for the physical mechanism of the Parametric Decay Instability (PDI). It is also helpful to research on the nonlinear interaction between the high-power HF EM waves and ionosphere plasma.
{"title":"A 2D Numerical Study of the Langmuir Parametric Instability in the Ionospheric Modification","authors":"T. Feng, Moran Liu, Chen Zhou","doi":"10.1109/ISAPE.2018.8634388","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634388","url":null,"abstract":"Parametric Decay Instability (PDI) plays an important role in the interaction of the high-power HF EM waves with ionosphere plasma. In this study, we have constructed a 2D numerical simulation model for studying PDI with a nearly realistic ionosphere background and a radio wave propagation model by taking a proper processing for the routine dynamic equations of plasma with generalized Zakharov method. The simulation results found that high-power HF EM waves could excite two electrostatic modes of a Langmuir wave and an ion acoustic wave near the reflection point of the ordinary wave (O-mode) within a timescale order of millisecond. The amplitude of density perturbation grows exponentially and significantly influencing the plasma frequency related to ‘low frequency’ density background. These processes are also followed by plasma caviton structures and trapped Langmuir waves. Finally, the O-mode heating leads to an intense localized turbulence. This paper also presents the simulation results of Langmuir parametric instability (LPI) excited by powerful HF wave heating at the O-mode reflection height. The study of this article contributes to formation of a deep impression for the physical mechanism of the Parametric Decay Instability (PDI). It is also helpful to research on the nonlinear interaction between the high-power HF EM waves and ionosphere plasma.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124217197","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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