Pub Date : 2016-03-13DOI: 10.1109/ROPACES.2016.7465329
H. Alroughani, J. Ethier, D. McNamara
Existing characteristic mode tracking algorithms experience difficulties when used for dielectric objects due to the presence of non-physical modes when surface integral equation models are used. It is shown how these problems can be circumvented using a pragmatic approach.
{"title":"Numerical experiments in tracking the characteristic modes of dielectric objects","authors":"H. Alroughani, J. Ethier, D. McNamara","doi":"10.1109/ROPACES.2016.7465329","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465329","url":null,"abstract":"Existing characteristic mode tracking algorithms experience difficulties when used for dielectric objects due to the presence of non-physical modes when surface integral equation models are used. It is shown how these problems can be circumvented using a pragmatic approach.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126637937","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465335
Y. Madany, H. Elkamchouchi, Bishoy I. Halim
Metamaterials is a rapidly evolving field of research that covers a vast range of artificial structures and electro-magnetic properties. Resulting from this, there is no universally accepted definition of what is meant by a meta-material. It is generally agreed that metamaterials are artificial media with unusual properties not found in their constituent materials. The composite right / left-handed transmission lines (CRLH-TLs) are the metamaterials with both of the RH and the LH properties. In this paper, study and design of smart frequency agility control system has been introduced and investigated. The proposed CRLH-TL has been evaluated using a commercial software. The final proposed system with smart control unit has been fabricated and the scattering characteristics have been illustrated using network analyzer to meet the multifunction requirements for communication and radar applications.
{"title":"Investigation and design of smart frequency agility control system using compact CRLH-TL for communication and radar applications","authors":"Y. Madany, H. Elkamchouchi, Bishoy I. Halim","doi":"10.1109/ROPACES.2016.7465335","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465335","url":null,"abstract":"Metamaterials is a rapidly evolving field of research that covers a vast range of artificial structures and electro-magnetic properties. Resulting from this, there is no universally accepted definition of what is meant by a meta-material. It is generally agreed that metamaterials are artificial media with unusual properties not found in their constituent materials. The composite right / left-handed transmission lines (CRLH-TLs) are the metamaterials with both of the RH and the LH properties. In this paper, study and design of smart frequency agility control system has been introduced and investigated. The proposed CRLH-TL has been evaluated using a commercial software. The final proposed system with smart control unit has been fabricated and the scattering characteristics have been illustrated using network analyzer to meet the multifunction requirements for communication and radar applications.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126405191","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465304
F. Nekoogar, F. Dowla
Advanced passive RFID tags integrated with a suite of sensors can play a significant role in the Internet of Things (IOT) ecosystem for longer range sensor applications. Although readers equipped with IPv6 communications capability allow the transfer of data from passive tags to the IOT world, reliable remote powering of such tag/sensor units still is a limiting factor in harsh propagation environments. In this paper we present a hybrid UWB/UHF signaling for reliable long-range tag-reader communications in challenging environments such as reflective, absorptive, and cluttered channels.
{"title":"Passive RFID for IOT using UWB/UHF hybrid signaling","authors":"F. Nekoogar, F. Dowla","doi":"10.1109/ROPACES.2016.7465304","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465304","url":null,"abstract":"Advanced passive RFID tags integrated with a suite of sensors can play a significant role in the Internet of Things (IOT) ecosystem for longer range sensor applications. Although readers equipped with IPv6 communications capability allow the transfer of data from passive tags to the IOT world, reliable remote powering of such tag/sensor units still is a limiting factor in harsh propagation environments. In this paper we present a hybrid UWB/UHF signaling for reliable long-range tag-reader communications in challenging environments such as reflective, absorptive, and cluttered channels.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116100024","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465376
Y. Mao, T. Jiang, A. Elsherbeni
An improved absorbing boundary condition for terminating finite-difference time-domain (FDTD) simulations, based on the surface impedance concept, is proposed in this paper. The improved method uses E component collocation instead of the H component collocation as in [1]. The performance of the two SIABCs and 10-layers CPML are discussed with a 3D example which employed these absorbing boundary conditions (ABCs) in the calculation of RCS of a dielectric sphere. The computer resources requirements are also discussed. The compared result indicates that both the SIABCs have a comparable absorbing performance with 10-layers CPML, and the E component collocated SIABC has a better absorbing performance relative to H component collocated SIABC.
{"title":"Improved surface impedance absorbing boundary for FDTD method","authors":"Y. Mao, T. Jiang, A. Elsherbeni","doi":"10.1109/ROPACES.2016.7465376","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465376","url":null,"abstract":"An improved absorbing boundary condition for terminating finite-difference time-domain (FDTD) simulations, based on the surface impedance concept, is proposed in this paper. The improved method uses E component collocation instead of the H component collocation as in [1]. The performance of the two SIABCs and 10-layers CPML are discussed with a 3D example which employed these absorbing boundary conditions (ABCs) in the calculation of RCS of a dielectric sphere. The computer resources requirements are also discussed. The compared result indicates that both the SIABCs have a comparable absorbing performance with 10-layers CPML, and the E component collocated SIABC has a better absorbing performance relative to H component collocated SIABC.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123794339","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465402
Varunkumar Singh
This work presents a full vectorial Yee's mesh based modesolver for anisotropic waveguides with five term Hermitian permittivity tensor and interpolation to compensate for the non-collocation of electric fields. The earlier anisotropic modesolvers with non diagonal permittivity tensor use simple finite difference, finite element or plane wave method for mode solving, also the earlier works on Yee's mesh based modesolver do not consider five term permittivity tensor. However in this work five term hermitian permittivity tensor along with electric field interpolation has been incorporated in Yee's mesh based modesolver and effective refractive index values have been shown as well as compared with previous work.
{"title":"A Yee's mesh based modesolver for anisotropic waveguides","authors":"Varunkumar Singh","doi":"10.1109/ROPACES.2016.7465402","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465402","url":null,"abstract":"This work presents a full vectorial Yee's mesh based modesolver for anisotropic waveguides with five term Hermitian permittivity tensor and interpolation to compensate for the non-collocation of electric fields. The earlier anisotropic modesolvers with non diagonal permittivity tensor use simple finite difference, finite element or plane wave method for mode solving, also the earlier works on Yee's mesh based modesolver do not consider five term permittivity tensor. However in this work five term hermitian permittivity tensor along with electric field interpolation has been incorporated in Yee's mesh based modesolver and effective refractive index values have been shown as well as compared with previous work.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122913654","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465457
E. N. Kuralay, E. F. Uzun, O. Ates, Y. Sahin, Taha Imeci
This paper represents a high-gain, single resonance microstrip patch antenna which operates at 14.70 GHz. Measurement result of electric field phi-polarized gain is 10.72 dB. There is an alternative design with four rectangular slots at 19.60 GHz. This antenna has compact structure thereby achieving size benefits over previously published works in literature. As a reason of large slitted structure the antenna manufactured easily and works well at high frequencies with more than 10 dB gain.
{"title":"Perturbed hexagonal antenna at 14.7 GHz","authors":"E. N. Kuralay, E. F. Uzun, O. Ates, Y. Sahin, Taha Imeci","doi":"10.1109/ROPACES.2016.7465457","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465457","url":null,"abstract":"This paper represents a high-gain, single resonance microstrip patch antenna which operates at 14.70 GHz. Measurement result of electric field phi-polarized gain is 10.72 dB. There is an alternative design with four rectangular slots at 19.60 GHz. This antenna has compact structure thereby achieving size benefits over previously published works in literature. As a reason of large slitted structure the antenna manufactured easily and works well at high frequencies with more than 10 dB gain.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115205647","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465379
L. Tamaye, R. Perron, D. Bibb, Jason Tanabe, Fernan Suela, G. Huang, M. Iskander
A phantom cross section of a human thorax was developed to evaluate the sensitivity of the Cardiopulmonary Stethoscope (CP-Stethoscope) system to detect changes in lung water content. Phantom heart and muscle tissues were also developed with dielectric properties similar to human tissue and sponges were used to model lung tissues. A structure was also built to evenly distribute water over the sponges. A 2port to 8port RF switch was developed to switch the sensors between transmitter and receiver configurations and examine sensitivity of measurement to sensors locations. Changes in the phase of the transmitted signal were correlated to the variation in the amount of the water inserted into the sponges. This experiment was used to examine the sensitivity of the CP-Stethoscope system and ability to detect water gradient in the lung. Results show that significant changes in the phase of the transmission coefficient are detectable as water migrates from the top surface to the bottom of the phantom model.
{"title":"CP-Stethoscope: Phantom model experiments","authors":"L. Tamaye, R. Perron, D. Bibb, Jason Tanabe, Fernan Suela, G. Huang, M. Iskander","doi":"10.1109/ROPACES.2016.7465379","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465379","url":null,"abstract":"A phantom cross section of a human thorax was developed to evaluate the sensitivity of the Cardiopulmonary Stethoscope (CP-Stethoscope) system to detect changes in lung water content. Phantom heart and muscle tissues were also developed with dielectric properties similar to human tissue and sponges were used to model lung tissues. A structure was also built to evenly distribute water over the sponges. A 2port to 8port RF switch was developed to switch the sensors between transmitter and receiver configurations and examine sensitivity of measurement to sensors locations. Changes in the phase of the transmitted signal were correlated to the variation in the amount of the water inserted into the sponges. This experiment was used to examine the sensitivity of the CP-Stethoscope system and ability to detect water gradient in the lung. Results show that significant changes in the phase of the transmission coefficient are detectable as water migrates from the top surface to the bottom of the phantom model.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"63 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114119792","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465403
J. Miller
Traditionally, an infinite ground plane is used to represent the water surface for analysis of antennas installed on ships or otherwise situated over water. While this is sufficient for some scenarios, we have found the need for more accuracy in representing short-range propagation close to a water surface. In this paper, we generate randomized, realistic water surfaces and use these in CEM simulations.
{"title":"Realistic randomized water surface generation for computational electromagnetics","authors":"J. Miller","doi":"10.1109/ROPACES.2016.7465403","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465403","url":null,"abstract":"Traditionally, an infinite ground plane is used to represent the water surface for analysis of antennas installed on ships or otherwise situated over water. While this is sufficient for some scenarios, we have found the need for more accuracy in representing short-range propagation close to a water surface. In this paper, we generate randomized, realistic water surfaces and use these in CEM simulations.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115894041","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465349
J. Rayno, M. Iskander
Previously developed hybrid genetic programming with low-level optimizer software is used along with two novel building block designs (3D loop and coil utilizing Fourier series) to design low frequency artificial magnetic conductor (AMC) ground planes using only design specifications. The methodology used to create these building block designs in the existing GP software is described, and an AMC design example covering 225-450 MHz is given. The design has 72.9% bandwidth and a thickness of λ0/15.
{"title":"Novel 3D loops and coils utilizing fourier series for low frequency AMC ground planes","authors":"J. Rayno, M. Iskander","doi":"10.1109/ROPACES.2016.7465349","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465349","url":null,"abstract":"Previously developed hybrid genetic programming with low-level optimizer software is used along with two novel building block designs (3D loop and coil utilizing Fourier series) to design low frequency artificial magnetic conductor (AMC) ground planes using only design specifications. The methodology used to create these building block designs in the existing GP software is described, and an AMC design example covering 225-450 MHz is given. The design has 72.9% bandwidth and a thickness of λ0/15.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116244798","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465357
M. Ignatenko, D. Filipović
Design of an electrically small low profile on-the-move HF antenna with 24 kHz instantaneous impedance bandwidth and gain better than -25 dBi for near vertical communications is presented. The antenna is mounted on the Oshkosh M-ATV and operates from 2 to 10 MHz. The profile is 0.8 m (λ/190 at 2 MHz) above vehicle roof, the length is 3.6 m (λ/42) and the width is 2.3 m (λ/65). Shown computational study agrees well with measurements that will be shown later on.
设计了一种具有24 kHz瞬时阻抗带宽、增益优于-25 dBi的小型移动高频天线，用于近垂直通信。天线安装在Oshkosh M-ATV上，工作频率为2至10 MHz。轮廓距车顶0.8 m (λ/190, 2mhz)，长3.6 m (λ/42)，宽2.3 m (λ/65)。所显示的计算研究与稍后将显示的测量结果非常吻合。
{"title":"Electrically small half-loop for wideband HF on-the-move operation","authors":"M. Ignatenko, D. Filipović","doi":"10.1109/ROPACES.2016.7465357","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465357","url":null,"abstract":"Design of an electrically small low profile on-the-move HF antenna with 24 kHz instantaneous impedance bandwidth and gain better than -25 dBi for near vertical communications is presented. The antenna is mounted on the Oshkosh M-ATV and operates from 2 to 10 MHz. The profile is 0.8 m (λ/190 at 2 MHz) above vehicle roof, the length is 3.6 m (λ/42) and the width is 2.3 m (λ/65). Shown computational study agrees well with measurements that will be shown later on.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115161579","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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