Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634038
Chun Chen, P. Ban, Shuji Sun
This paper proposes a method for forecasting the ionospheric critical frequency, foF2, one day in advance using the support vector machine approach. The output is the predicted foF2 one day ahead. The network is trained to use the ionospheric sounding data at Guangzhou station at high and low solar activity. The performance of the SVM model was verified with observed data. It is shown that the predicted foF2 has agreement with the observed foF2.
{"title":"On the Predictability of FoF2 using Support Vector Machine","authors":"Chun Chen, P. Ban, Shuji Sun","doi":"10.1109/ISAPE.2018.8634038","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634038","url":null,"abstract":"This paper proposes a method for forecasting the ionospheric critical frequency, foF2, one day in advance using the support vector machine approach. The output is the predicted foF2 one day ahead. The network is trained to use the ionospheric sounding data at Guangzhou station at high and low solar activity. The performance of the SVM model was verified with observed data. It is shown that the predicted foF2 has agreement with the observed foF2.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117152183","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.2018.8634156
Qi Chen, Z. Xue, W. Ren, Weiming Li
A method which is the combination of traditional antipodal Vivaldi and tightly coupled approach is proposed in this paper to meet the demands of the application of ultrawideband phased array antenna. Through the improvement of the combination structure, the performance of broadband array has been greatly improved. Firstly, by adding the truncated arms to the edge elements at both ends to compensate the edge elements. Then, by changing the bottom exponential curve of the antipodal Vivaldi to a special curve to obtain better low-frequency performance, the array has a VSWR of less than 2.5 within the band of 2–12 GHz. Finally, by arraying triangle arrays and controlling the number of elements in each row, the grating lobes and lobe-splitting phenomenon won't appear at the array pattern within the band of 2–12 GHz
{"title":"Research on the improvement of tightly coupled antipodal Vivaldi antenna array","authors":"Qi Chen, Z. Xue, W. Ren, Weiming Li","doi":"10.1109/ISAPE.2018.8634156","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634156","url":null,"abstract":"A method which is the combination of traditional antipodal Vivaldi and tightly coupled approach is proposed in this paper to meet the demands of the application of ultrawideband phased array antenna. Through the improvement of the combination structure, the performance of broadband array has been greatly improved. Firstly, by adding the truncated arms to the edge elements at both ends to compensate the edge elements. Then, by changing the bottom exponential curve of the antipodal Vivaldi to a special curve to obtain better low-frequency performance, the array has a VSWR of less than 2.5 within the band of 2–12 GHz. Finally, by arraying triangle arrays and controlling the number of elements in each row, the grating lobes and lobe-splitting phenomenon won't appear at the array pattern within the band of 2–12 GHz","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117183667","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.2018.8634410
Yang Niu, Bing Hu
In the context of the W-band outfield test system, antennas need high isolation to acquire target characteristic information at different latitudes and low sidelobe to realize high resolution. In order to meet above the two key requirements, this paper designs a new type of $2times 2$ dual-polarized full-corporate waveguide slot array unit. This unit uses orthogonal-mode coupling structure to achieve dual-polarized feed function. It utilizes circular slot to radiate electromagnetic waves. Antenna array consists of array units to reach narrow beamwidth and low sidelobe level. The simulation results show that the VSWR is less than 1.5 in the band of 91-97GHz. The antenna array has a gain more than 28dB and 3dB-beamwidth is 7°. It has a sidelobe level less than −22dB and a cross-polarization level less than −55dB.
{"title":"A Dual-Polarized Full-Corporate Waveguide Slot Array Antenna on W-Band","authors":"Yang Niu, Bing Hu","doi":"10.1109/ISAPE.2018.8634410","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634410","url":null,"abstract":"In the context of the W-band outfield test system, antennas need high isolation to acquire target characteristic information at different latitudes and low sidelobe to realize high resolution. In order to meet above the two key requirements, this paper designs a new type of $2times 2$ dual-polarized full-corporate waveguide slot array unit. This unit uses orthogonal-mode coupling structure to achieve dual-polarized feed function. It utilizes circular slot to radiate electromagnetic waves. Antenna array consists of array units to reach narrow beamwidth and low sidelobe level. The simulation results show that the VSWR is less than 1.5 in the band of 91-97GHz. The antenna array has a gain more than 28dB and 3dB-beamwidth is 7°. It has a sidelobe level less than −22dB and a cross-polarization level less than −55dB.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117224341","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.2018.8634091
Fei Wang, Yu-mei Liu, Shu-ji Sun
In this study, historical data MOFF from two HF propagation paths: Qingdao-Lanzhou and Guangzhou-Haikou at mid and low latitude, the midpoint referenced data are from two ionosondes located at Xinxiang and Guangzhou, respectively. They are used to study the disturbance dMOFF properties reflected by the ionosphere during the ionospheric disturbance period, and compared with the variation of dMUF calculated by ITU-R P.533. The relative variation dfoF2 in the midpoint is used an indicator to denote the ionospheric disturbance magnitude. It is found that the change trends of dMOFF, dfoF2 and dMUF are similar to each other during the ionospheric disturbance time.
{"title":"The statistic characteristics of HF Oblique Sounding Channel at mid and low latitude during ionospheric disturbance time","authors":"Fei Wang, Yu-mei Liu, Shu-ji Sun","doi":"10.1109/ISAPE.2018.8634091","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634091","url":null,"abstract":"In this study, historical data MOFF from two HF propagation paths: Qingdao-Lanzhou and Guangzhou-Haikou at mid and low latitude, the midpoint referenced data are from two ionosondes located at Xinxiang and Guangzhou, respectively. They are used to study the disturbance dMOFF properties reflected by the ionosphere during the ionospheric disturbance period, and compared with the variation of dMUF calculated by ITU-R P.533. The relative variation dfoF2 in the midpoint is used an indicator to denote the ionospheric disturbance magnitude. It is found that the change trends of dMOFF, dfoF2 and dMUF are similar to each other during the ionospheric disturbance time.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121347684","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.2018.8634281
Deqiang Xie, Jianxin Yi, Ji Shen, X. Wan
In recent years, the demand for low-altitude surveillance has increased dramatically, and passive radar has received more and more attentions. In this experimental research, we develop a multi-FM based passive radar system in Wuhan University. It is demonstrated that the digital beamforming (DBF) method can be used to simultaneously extract direct waves from different orientations as reference signals. Using this technique, we achieve multi-FM channel joint detection without increasing the complexity of the hardware system, which improves the detection stability of FM based passive radar.
{"title":"Experimental Research of Multi-FM Based Passive Radar","authors":"Deqiang Xie, Jianxin Yi, Ji Shen, X. Wan","doi":"10.1109/ISAPE.2018.8634281","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634281","url":null,"abstract":"In recent years, the demand for low-altitude surveillance has increased dramatically, and passive radar has received more and more attentions. In this experimental research, we develop a multi-FM based passive radar system in Wuhan University. It is demonstrated that the digital beamforming (DBF) method can be used to simultaneously extract direct waves from different orientations as reference signals. Using this technique, we achieve multi-FM channel joint detection without increasing the complexity of the hardware system, which improves the detection stability of FM based passive radar.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127118990","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.2018.8634295
Lei Li
Planar inverted-F antenna analysed using the finite difference time domain (FDTD) method with absorbing boundary condition (ABC) are demonstrated in this thesis. To compare the effective of absorbing boundary condition at absorbing evanescent wave, two kinds of absorbing boundary conditions algorithm of the FDTD method are presented, which are convention perfectly matched layer (PML) absorbing boundary conditions and convolutional Perfectly Matched Layer (CPML) absorbing boundary condition. Based upon the programming language of MATLAB, the FDTD method is realized. The antenna is simulated using Ansoft High Frequency Structure Simulator (HFSS) software, The simulation results agree fairly well with theoretical CPML analysis. The dimension of proposed antenna is ($10.48times 16times 0.847$) mm3 and its resonated at (2.23-5.89) GHz which cover the C-communication frequency band. Inverted-F antenna display omnidirectional radiation pattern and good peak gains across the operation bands.
{"title":"Comparasion of FDTD Analysis With Absorbing Boundary Condition Based on Inverted-F Antenna","authors":"Lei Li","doi":"10.1109/ISAPE.2018.8634295","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634295","url":null,"abstract":"Planar inverted-F antenna analysed using the finite difference time domain (FDTD) method with absorbing boundary condition (ABC) are demonstrated in this thesis. To compare the effective of absorbing boundary condition at absorbing evanescent wave, two kinds of absorbing boundary conditions algorithm of the FDTD method are presented, which are convention perfectly matched layer (PML) absorbing boundary conditions and convolutional Perfectly Matched Layer (CPML) absorbing boundary condition. Based upon the programming language of MATLAB, the FDTD method is realized. The antenna is simulated using Ansoft High Frequency Structure Simulator (HFSS) software, The simulation results agree fairly well with theoretical CPML analysis. The dimension of proposed antenna is ($10.48times 16times 0.847$) mm3 and its resonated at (2.23-5.89) GHz which cover the C-communication frequency band. Inverted-F antenna display omnidirectional radiation pattern and good peak gains across the operation bands.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127343976","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.2018.8634264
Xiaoming Gou, Lantu Guo, Zhedong Wu, Cong Tang
Emitter localization via triangulation is a common task for spectrum management, and it is typically realized by angle-of-arrival (AoA) estimation with correlative interferometers installed within fixed or mobile monitoring stations. The AoA estimation technique is addressed and a modulation-specific algorithm is proposed. Simulation results show that, for a specific set of modulation types, namely the ones which are noncircular, both the accuracy of AoA estimation and that of localization are improved.
{"title":"Modulation-Specific Angle-of-Arrival Estimation Algorithm for Correlative Interferometry","authors":"Xiaoming Gou, Lantu Guo, Zhedong Wu, Cong Tang","doi":"10.1109/ISAPE.2018.8634264","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634264","url":null,"abstract":"Emitter localization via triangulation is a common task for spectrum management, and it is typically realized by angle-of-arrival (AoA) estimation with correlative interferometers installed within fixed or mobile monitoring stations. The AoA estimation technique is addressed and a modulation-specific algorithm is proposed. Simulation results show that, for a specific set of modulation types, namely the ones which are noncircular, both the accuracy of AoA estimation and that of localization are improved.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127507319","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.2018.8634252
Jing Dong, Ming Zhang, Mingliang Huang
In this paper, we study the lightning induced transient effects on coaxial cables for ships. The coaxial cables with different grounding and shielding measures are injected with lightning waves according to the US military standard MIL-STD-461G, so that the circuit voltage at the end of the cables can be detected by the oscilloscope. A simply theory analysis is given and simulations are taken to find the influence of such measures. At last, experimental measurements validate the simulation results.
{"title":"Analysis of Lightning Induced Transient Effects on Coaxial Cables for Ships","authors":"Jing Dong, Ming Zhang, Mingliang Huang","doi":"10.1109/ISAPE.2018.8634252","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634252","url":null,"abstract":"In this paper, we study the lightning induced transient effects on coaxial cables for ships. The coaxial cables with different grounding and shielding measures are injected with lightning waves according to the US military standard MIL-STD-461G, so that the circuit voltage at the end of the cables can be detected by the oscilloscope. A simply theory analysis is given and simulations are taken to find the influence of such measures. At last, experimental measurements validate the simulation results.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124989470","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.2018.8634195
Yijuan Yang, Zheng Li, Bang Wei, Junhong Wang
A novel quasi-Yagi antenna is presented based on spoof surface plasmon polaritons (SSPPs). In the new design, the antenna consists of a transition from a coplanar waveguide to an SSPPs waveguide, an SSPPs balun, an SSPPs driving dipole, and two SSPPs directors. The lengths of the driving dipole and director are approximately reduced by 32% and 27% compared with that of the conventional antenna in the free space without substrate, as a result of high phase constant on the SSPPs. Numerical simulations demonstrate good performance of the proposed structure, which has a gain of 8.7 dBi operating at 3 GHz. The proposed SSPPs quasi-Yagi antenna has potential value in wireless communication systems due to its compact dimension and good performance.
{"title":"A Compact Quasi-Yagi Antenna Based on Spoof Surface Plasmon Polaritons","authors":"Yijuan Yang, Zheng Li, Bang Wei, Junhong Wang","doi":"10.1109/ISAPE.2018.8634195","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634195","url":null,"abstract":"A novel quasi-Yagi antenna is presented based on spoof surface plasmon polaritons (SSPPs). In the new design, the antenna consists of a transition from a coplanar waveguide to an SSPPs waveguide, an SSPPs balun, an SSPPs driving dipole, and two SSPPs directors. The lengths of the driving dipole and director are approximately reduced by 32% and 27% compared with that of the conventional antenna in the free space without substrate, as a result of high phase constant on the SSPPs. Numerical simulations demonstrate good performance of the proposed structure, which has a gain of 8.7 dBi operating at 3 GHz. The proposed SSPPs quasi-Yagi antenna has potential value in wireless communication systems due to its compact dimension and good performance.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125934715","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.2018.8634221
Tianqi Hao, Zhuangli Dong, Qiao Huang
The circulator is an important device in the microwave field. In recent years, due to the development of millimeter wave communication, microwave devices have begun to be miniaturized and easy to integrate. With the development of the technology, the market is beginning to see the need for circulators based on the new band. Based on ferrite materials, this paper, designs a microstrip circulator working at 1.9-2.6GHz, which is designed and simulated in the commercial simulation software HFSS. The data are applicable to the corresponding industrial indicators and needs. The measurement meets the requirements, and the processing and design scheme has reference significance for the circulators in other frequency bands.
{"title":"Design of 1.9GHz-2.6GHz Microstrip Circulator Based on Ferrite Material","authors":"Tianqi Hao, Zhuangli Dong, Qiao Huang","doi":"10.1109/ISAPE.2018.8634221","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634221","url":null,"abstract":"The circulator is an important device in the microwave field. In recent years, due to the development of millimeter wave communication, microwave devices have begun to be miniaturized and easy to integrate. With the development of the technology, the market is beginning to see the need for circulators based on the new band. Based on ferrite materials, this paper, designs a microstrip circulator working at 1.9-2.6GHz, which is designed and simulated in the commercial simulation software HFSS. The data are applicable to the corresponding industrial indicators and needs. The measurement meets the requirements, and the processing and design scheme has reference significance for the circulators in other frequency bands.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115184359","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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