Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388414
T. Kojima, Shuri Fujiwara
One of the most important problems in helicopter satellite communications is the periodic blockage of the received signal caused by rotor blades. Code division multiplexing (CDM) has an implicit time diversity effect overcoming the periodic blockage. Performance of CDM employing Walsh-Hadamard code (WHCDM) under the periodic blockage environment is investigated in this paper. First, we show that a simple WHCDM scheme has the implicit time diversity effect by computer simulation. Next, a WHCDM scheme combined with explicit time diversity is proposed. The proposed scheme improves the bit error rate performance of the conventional time diversity scheme in high speed data transmission.
{"title":"Performance of Walsh-Hadamard code division multiplexing in helicopter satellite communications","authors":"T. Kojima, Shuri Fujiwara","doi":"10.1109/ATC.2015.7388414","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388414","url":null,"abstract":"One of the most important problems in helicopter satellite communications is the periodic blockage of the received signal caused by rotor blades. Code division multiplexing (CDM) has an implicit time diversity effect overcoming the periodic blockage. Performance of CDM employing Walsh-Hadamard code (WHCDM) under the periodic blockage environment is investigated in this paper. First, we show that a simple WHCDM scheme has the implicit time diversity effect by computer simulation. Next, a WHCDM scheme combined with explicit time diversity is proposed. The proposed scheme improves the bit error rate performance of the conventional time diversity scheme in high speed data transmission.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115969291","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388386
Chi-Ngon Nguyen, Nguyen Thai-Nghe
This study proposes an approach for building a Semi-Automatic Agricultural Extension Support System based on mobile communication networks and machine learning. This system can be used to link farmers and agricultural experts, thus, it can be considered as an online “farmer-expert bridge”. To build the system, at first, we need to build modules for sending and receiving SMS/MMS messages. These modules are important for farmers to send questions or images, e.g., about their rice status, that need to be consulted by the agricultural experts. Next, a message classification module is built using a combination of machine learning method (e.g., SVM) with image and text processing technologies. Finally, a whole web-based system is conducted to integrate these modules. Initial results show that construction of this system is feasible. This is also the foundation for building an online automatic agricultural extension support system through mobile communication networks.
{"title":"An agricultural extension support system on mobile communication networks","authors":"Chi-Ngon Nguyen, Nguyen Thai-Nghe","doi":"10.1109/ATC.2015.7388386","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388386","url":null,"abstract":"This study proposes an approach for building a Semi-Automatic Agricultural Extension Support System based on mobile communication networks and machine learning. This system can be used to link farmers and agricultural experts, thus, it can be considered as an online “farmer-expert bridge”. To build the system, at first, we need to build modules for sending and receiving SMS/MMS messages. These modules are important for farmers to send questions or images, e.g., about their rice status, that need to be consulted by the agricultural experts. Next, a message classification module is built using a combination of machine learning method (e.g., SVM) with image and text processing technologies. Finally, a whole web-based system is conducted to integrate these modules. Initial results show that construction of this system is feasible. This is also the foundation for building an online automatic agricultural extension support system through mobile communication networks.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116113904","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388302
Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien
Interactive activity recognition from the RGB videos still remains a challenge, therefore some existing approaches paid the attention to RGB-Depth video process to avoid problems relating to mutual occlusion and redundant human pose and to improve accuracy of skeleton extraction. From the single action to complex interaction activity, it is necessary an efficient model to describe the relationship of body components between multi-human objects. In this research, the authors proposed a hierarchical model based on the Pachinko Allocation Model for interaction recognition. Concretely, the joint features comprising joint distant and joint motion are calculated from the skeleton position and then support to topic modeling. The probabilistic models describing the flexible relationship between features - poselets - activities are generated by this model. Finally, the Binary Tree of Support Vector Machine is applied for classification. Compared with existing state-of-the-arts, the proposed method outperforms in overall classification accuracy (8-21% approximately) with the SBU Kinect Interaction Dataset.
{"title":"PAM-based flexible generative topic model for 3D interactive activity recognition","authors":"Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien","doi":"10.1109/ATC.2015.7388302","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388302","url":null,"abstract":"Interactive activity recognition from the RGB videos still remains a challenge, therefore some existing approaches paid the attention to RGB-Depth video process to avoid problems relating to mutual occlusion and redundant human pose and to improve accuracy of skeleton extraction. From the single action to complex interaction activity, it is necessary an efficient model to describe the relationship of body components between multi-human objects. In this research, the authors proposed a hierarchical model based on the Pachinko Allocation Model for interaction recognition. Concretely, the joint features comprising joint distant and joint motion are calculated from the skeleton position and then support to topic modeling. The probabilistic models describing the flexible relationship between features - poselets - activities are generated by this model. Finally, the Binary Tree of Support Vector Machine is applied for classification. Compared with existing state-of-the-arts, the proposed method outperforms in overall classification accuracy (8-21% approximately) with the SBU Kinect Interaction Dataset.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127992139","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388376
Nhat Nguyen, Kien N. Huynh, N. N. Vo, T. V. Pham
Fish Detection and Tracking is an important step in studying oceanography, especially for forecasting changes in the quality of water and the increasing or decreasing number of fish in a population. In this paper, combination of Gaussian Mixture Model and Frame-Differencing algorithm (CGMMFD) is proposed to improve tracking performance in different scenarios. Also, four other techniques, namely Mean Background, Gaussian Mixture Model, Mean Shift Tracking and Particle Filter are also investigated. In this study, we use the self-built database with some typical tracking situations such as appearance of illusions, different swimming velocities of the fish and qualities of water. Mean square error and Variance are used to assess the performance of each technique for different scenarios. The experimental results indicate that our proposed algorithm gives higher tracking accuracy. While other techniques have difficulties to track the fish location or the fish centroid in some certain scenarios, the proposed algorithm can perform well in different situations.
{"title":"Fish detection and movement tracking","authors":"Nhat Nguyen, Kien N. Huynh, N. N. Vo, T. V. Pham","doi":"10.1109/ATC.2015.7388376","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388376","url":null,"abstract":"Fish Detection and Tracking is an important step in studying oceanography, especially for forecasting changes in the quality of water and the increasing or decreasing number of fish in a population. In this paper, combination of Gaussian Mixture Model and Frame-Differencing algorithm (CGMMFD) is proposed to improve tracking performance in different scenarios. Also, four other techniques, namely Mean Background, Gaussian Mixture Model, Mean Shift Tracking and Particle Filter are also investigated. In this study, we use the self-built database with some typical tracking situations such as appearance of illusions, different swimming velocities of the fish and qualities of water. Mean square error and Variance are used to assess the performance of each technique for different scenarios. The experimental results indicate that our proposed algorithm gives higher tracking accuracy. While other techniques have difficulties to track the fish location or the fish centroid in some certain scenarios, the proposed algorithm can perform well in different situations.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128884785","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388341
Duy Tan Faculty, Nguyen Dinh Viet
One of the most important challenges in heterogeneous wireless sensor network (WSN) is to design a routing protocol that use energy efficiently to prolong the lifetime of the entire network due to the limited battery power of sensor nodes. To solve this problem, in this paper, we propose Sector-Chain Based Clustering (SCBC) Routing Protocol, in which, entire network area is divided into sectors (clusters), which balance to the number of nodes. SCBC further reduces energy dissipation of communication in network by constructing chain for each cluster with the chain leader as the cluster head (CH) or secondary cluster head (SCH) that has high residual energy and the shortest distance between candidate nodes and base station (BS) in network. In addition, SCBC improves energy efficiency by calculating the time length of each round in the steady data transmission phase for CHs or SCHs but still guarantee that it is alive in next round. Our simulation results show that the network lifetime of our proposed protocol can be improved about 70% and 20% in comparison with PEGASIS (Power-Efficient Gathering in Sensor Information System) and IEEPB (An Improved Energy-Efficient PEGASIS-Based) protocols, respectively.
在异构无线传感器网络(WSN)中，由于传感器节点的电池电量有限，设计一种有效利用能量的路由协议来延长整个网络的使用寿命是一个重要的挑战。为了解决这一问题，本文提出了基于扇区链的聚类路由协议(SCBC)，该协议将整个网络区域划分为扇区(集群)，每个扇区(集群)与节点数量相平衡。SCBC通过为每个集群构建链，以剩余能量高、候选节点与网络基站之间距离最短的簇头(CH)或次簇头(SCH)作为链头，进一步减少网络中通信的能量耗散。此外，SCBC通过计算CHs或sc在稳定数据传输阶段的每轮时间长度来提高能量效率，但仍然保证它在下一轮中是存活的。仿真结果表明，与PEGASIS (Power-Efficient Gathering in Sensor Information System)和IEEPB (a improved efficient PEGASIS- based)协议相比，该协议的网络生存期分别提高了70%和20%左右。
{"title":"SCBC: Sector-chain based clustering routing protocol for energy efficiency in heterogeneous wireless sensor network","authors":"Duy Tan Faculty, Nguyen Dinh Viet","doi":"10.1109/ATC.2015.7388341","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388341","url":null,"abstract":"One of the most important challenges in heterogeneous wireless sensor network (WSN) is to design a routing protocol that use energy efficiently to prolong the lifetime of the entire network due to the limited battery power of sensor nodes. To solve this problem, in this paper, we propose Sector-Chain Based Clustering (SCBC) Routing Protocol, in which, entire network area is divided into sectors (clusters), which balance to the number of nodes. SCBC further reduces energy dissipation of communication in network by constructing chain for each cluster with the chain leader as the cluster head (CH) or secondary cluster head (SCH) that has high residual energy and the shortest distance between candidate nodes and base station (BS) in network. In addition, SCBC improves energy efficiency by calculating the time length of each round in the steady data transmission phase for CHs or SCHs but still guarantee that it is alive in next round. Our simulation results show that the network lifetime of our proposed protocol can be improved about 70% and 20% in comparison with PEGASIS (Power-Efficient Gathering in Sensor Information System) and IEEPB (An Improved Energy-Efficient PEGASIS-Based) protocols, respectively.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130509077","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388365
Ha L. Vu, Hai Viet Tran, Lam D. Tran, Minh Hong Phan
This article proposes a reconfiguration solution for CMOS frequency synthesizer with a hybrid architecture which is a combination of a Direct Digital Synthesizer (DDS) and a Phase Locked Loop (PLL). The DDS is implemented in FPGA platform functioning a reference frequency to the PLL. The PLL is designed using CMOS technology, being reconfigurable to accelerate tuning speed. Instead of employing a hardware-based lock detector, a software algorithm is used to determine the switching time and to optimize the frequency tuning speed, consuming energy or limited pick power. This PLL is used in cognitive radio for spectrum sensing function.
{"title":"A reconfiguration solution for CMOS frequency synthesizers in cognitive radios","authors":"Ha L. Vu, Hai Viet Tran, Lam D. Tran, Minh Hong Phan","doi":"10.1109/ATC.2015.7388365","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388365","url":null,"abstract":"This article proposes a reconfiguration solution for CMOS frequency synthesizer with a hybrid architecture which is a combination of a Direct Digital Synthesizer (DDS) and a Phase Locked Loop (PLL). The DDS is implemented in FPGA platform functioning a reference frequency to the PLL. The PLL is designed using CMOS technology, being reconfigurable to accelerate tuning speed. Instead of employing a hardware-based lock detector, a software algorithm is used to determine the switching time and to optimize the frequency tuning speed, consuming energy or limited pick power. This PLL is used in cognitive radio for spectrum sensing function.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126435521","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388307
G. Luu, P. Ravier, O. Buttelli
The aim of this study is to validate the time delay estimators recently developed by our group. We test the estimators with the real data in both case isometric isotonic and isometric anisotonic contraction in order to take into account the stationarity and the non-stationarity of the data. The results indicate that these estimators have coherent behaviors with the law of Henneman up to 60% Maximal Voluntary Contraction(MVC) in both cases.
{"title":"Validation of the time delay estimators applied to the surface electromyography signals during isometric isotonic and isometric anisotonic contraction","authors":"G. Luu, P. Ravier, O. Buttelli","doi":"10.1109/ATC.2015.7388307","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388307","url":null,"abstract":"The aim of this study is to validate the time delay estimators recently developed by our group. We test the estimators with the real data in both case isometric isotonic and isometric anisotonic contraction in order to take into account the stationarity and the non-stationarity of the data. The results indicate that these estimators have coherent behaviors with the law of Henneman up to 60% Maximal Voluntary Contraction(MVC) in both cases.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126143016","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388416
T. Ho-Phuoc, D. T. Cong
The present paper proposes a new method for color image demosaicing. This method separates luminance from chrominance and allows luminance to be extracted directly from known pixel values. Since interpolation for missing pixels is applied only to chrominance channels, it can reduce artifacts. Moreover, in chrominance channels the proposed method tries to interpolate pixels along edges. As consequence, edges are better preserved in the demosaiced image and false colors, which are a popular problem in demosaicing, are correctly eliminated. Comparisons with other algorithms show satisfying performances of our method in both qualitative and quantitative criteria. Another advantage of the proposed method relates to its low computational complexity, which can facilitate hardware implementation.
{"title":"Compact and efficient algorithm for color demosaicing","authors":"T. Ho-Phuoc, D. T. Cong","doi":"10.1109/ATC.2015.7388416","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388416","url":null,"abstract":"The present paper proposes a new method for color image demosaicing. This method separates luminance from chrominance and allows luminance to be extracted directly from known pixel values. Since interpolation for missing pixels is applied only to chrominance channels, it can reduce artifacts. Moreover, in chrominance channels the proposed method tries to interpolate pixels along edges. As consequence, edges are better preserved in the demosaiced image and false colors, which are a popular problem in demosaicing, are correctly eliminated. Comparisons with other algorithms show satisfying performances of our method in both qualitative and quantitative criteria. Another advantage of the proposed method relates to its low computational complexity, which can facilitate hardware implementation.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123015805","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388392
T. Q. Tho, T. V. Anh, L. M. Phương
Nowadays, there is a rapid development of devices of uninterruptible power supply (UPS) in communications. Inverter is one of the important parts in the UPS and its producing of current harmonics negatively affects the operation quality of communication devices. Therefore, reduction of current harmonics in the UPSs to achieve the stringent standards is one of the priority tasks of the inverters. Increasing the switching frequency of sinusoidal pulse-width modulation (SPWM) of inverters for reduction of current total harmonic distortion (THD) makes switching loss increase. This paper proposes an optimal SPWM technique, with variable switching cycle in every half of the fundamental period, for reducing the current harmonics, without any increase in switching loss. The results of the proposed technique are compared with those of the conventional constant switching cycle technique and the cascaded 5-level inverter to validate the performance of the proposed technique.
{"title":"Optimal modulation to reduce harmonics in inverters","authors":"T. Q. Tho, T. V. Anh, L. M. Phương","doi":"10.1109/ATC.2015.7388392","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388392","url":null,"abstract":"Nowadays, there is a rapid development of devices of uninterruptible power supply (UPS) in communications. Inverter is one of the important parts in the UPS and its producing of current harmonics negatively affects the operation quality of communication devices. Therefore, reduction of current harmonics in the UPSs to achieve the stringent standards is one of the priority tasks of the inverters. Increasing the switching frequency of sinusoidal pulse-width modulation (SPWM) of inverters for reduction of current total harmonic distortion (THD) makes switching loss increase. This paper proposes an optimal SPWM technique, with variable switching cycle in every half of the fundamental period, for reducing the current harmonics, without any increase in switching loss. The results of the proposed technique are compared with those of the conventional constant switching cycle technique and the cascaded 5-level inverter to validate the performance of the proposed technique.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121274438","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 : 2015-10-01DOI: 10.1109/ATC.2015.7388351
Wengang Chen, C. Balanis, C. Birtcher
The reflection variation property of Electromagnetic Band-Gap (EBG) structures can be utilized to reduce the Radar Cross Section (RCS) of ground planes. Combining PEC and EBG structures on the same ground plane forms checkerboard surfaces which can achieve a RCS reduction in a narrow frequency band. However, a wider band RCS reduction can be realized by combining two different EBG structures. It can realize 60% frequency bandwidth for the 10-dB RCS reduction. The scattered fields for square checkerboard surfaces are re-directed toward four quadrants, while the scattering for hexagonal checkerboard surfaces are toward six directions. The maxima of the RCS for checkerboard surfaces in the four quadrants are 10 dB less than those of the PEC ground plane, and more than 19 dB RCS reduction is obtained along the principal planes. Both bistatic and monostatic RCS are compared with those of the equal-sized PEC ground planes.
{"title":"Scattering control using square and hexagonal checkerboard surfaces","authors":"Wengang Chen, C. Balanis, C. Birtcher","doi":"10.1109/ATC.2015.7388351","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388351","url":null,"abstract":"The reflection variation property of Electromagnetic Band-Gap (EBG) structures can be utilized to reduce the Radar Cross Section (RCS) of ground planes. Combining PEC and EBG structures on the same ground plane forms checkerboard surfaces which can achieve a RCS reduction in a narrow frequency band. However, a wider band RCS reduction can be realized by combining two different EBG structures. It can realize 60% frequency bandwidth for the 10-dB RCS reduction. The scattered fields for square checkerboard surfaces are re-directed toward four quadrants, while the scattering for hexagonal checkerboard surfaces are toward six directions. The maxima of the RCS for checkerboard surfaces in the four quadrants are 10 dB less than those of the PEC ground plane, and more than 19 dB RCS reduction is obtained along the principal planes. Both bistatic and monostatic RCS are compared with those of the equal-sized PEC ground planes.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748117","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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