Pub Date : 2015-12-21DOI: 10.1109/COMCAS.2015.7360360
Itzik Cohen, N. Levanon
Doppler processing of a coherent periodic waveform usually employs an n-pulse (or n-period) canceller followed by a weighted FFT. Early moving target detection (MTD) used a simple 3-pulse canceller as the MTI filter. MTD in ground-based radar faces a conflict between clutter attenuation and slow targets' visibility. The paper suggests two simple modifications to a 3-pulse canceller that will ease this conflict. Detecting very slow targets within stationary clutter gains importance in border or perimeter safeguarding.
{"title":"Adjusting 3-pulse canceller to enhance slow radar targets","authors":"Itzik Cohen, N. Levanon","doi":"10.1109/COMCAS.2015.7360360","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360360","url":null,"abstract":"Doppler processing of a coherent periodic waveform usually employs an n-pulse (or n-period) canceller followed by a weighted FFT. Early moving target detection (MTD) used a simple 3-pulse canceller as the MTI filter. MTD in ground-based radar faces a conflict between clutter attenuation and slow targets' visibility. The paper suggests two simple modifications to a 3-pulse canceller that will ease this conflict. Detecting very slow targets within stationary clutter gains importance in border or perimeter safeguarding.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123483503","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360370
M. Pieraccini, F. Papi, Silvestro Rocchio
In this paper a rotating antenna GB-SAR, that we named RotoSAR, is proposed and tested. The radar head is fixed at a rotating arm and the antennas are aimed in direction orthogonal to the rotation plane. Potential and limits of this configuration is studied, with simulations and in-field measurements, with particular regard to imagery performances.
{"title":"SAR imagery by RotoSAR","authors":"M. Pieraccini, F. Papi, Silvestro Rocchio","doi":"10.1109/COMCAS.2015.7360370","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360370","url":null,"abstract":"In this paper a rotating antenna GB-SAR, that we named RotoSAR, is proposed and tested. The radar head is fixed at a rotating arm and the antennas are aimed in direction orthogonal to the rotation plane. Potential and limits of this configuration is studied, with simulations and in-field measurements, with particular regard to imagery performances.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123349008","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360418
M. Ryzhii, V. Ryzhii, T. Otsuji, M. Shur
We evaluate the operation of vertical hot-electron graphene-base transistors (HET-GBTs) as detectors of terahertz (THz) radiation using the developed device model. The model accounts for the carrier statistics, tunneling injection from the emitter, electron propagation across the barrier layer with partial capture into the graphene-layer (GL) base, and the self-consistent plasma oscillations of the electric potential and the hole density in the GL-base. The calculated responsivity of the HET-GBT THz detectors as a function of the signal frequency exhibits sharp resonant maxima in the THz range of frequencies associated with the excitation of plasma oscillations. The positions of these maxima are controlled by the applied bias voltages. The HET-GBTs can compete with and even surpass other plasmonic THz detectors.
{"title":"Vertical hot-electron graphene-base transistors as resonant plasmonic terahertz detectors","authors":"M. Ryzhii, V. Ryzhii, T. Otsuji, M. Shur","doi":"10.1109/COMCAS.2015.7360418","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360418","url":null,"abstract":"We evaluate the operation of vertical hot-electron graphene-base transistors (HET-GBTs) as detectors of terahertz (THz) radiation using the developed device model. The model accounts for the carrier statistics, tunneling injection from the emitter, electron propagation across the barrier layer with partial capture into the graphene-layer (GL) base, and the self-consistent plasma oscillations of the electric potential and the hole density in the GL-base. The calculated responsivity of the HET-GBT THz detectors as a function of the signal frequency exhibits sharp resonant maxima in the THz range of frequencies associated with the excitation of plasma oscillations. The positions of these maxima are controlled by the applied bias voltages. The HET-GBTs can compete with and even surpass other plasmonic THz detectors.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133463655","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360422
G. Kolezas, G. P. Zouros, J. Roumeliotis
In this work we present a closed-form solution for the electromagnetic radiation of a prolate or oblate spheroidal antenna. The problem is solved using a shape perturbation technique, allowing a closed-form solution which is valid for small eccentricities of the spheroid. We validate our approach by comparing with the full wave solution and present numerical results for radiation patterns.
{"title":"Study of radiation characteristics of prolate or oblate spheroidal antennas using shape perturbation method","authors":"G. Kolezas, G. P. Zouros, J. Roumeliotis","doi":"10.1109/COMCAS.2015.7360422","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360422","url":null,"abstract":"In this work we present a closed-form solution for the electromagnetic radiation of a prolate or oblate spheroidal antenna. The problem is solved using a shape perturbation technique, allowing a closed-form solution which is valid for small eccentricities of the spheroid. We validate our approach by comparing with the full wave solution and present numerical results for radiation patterns.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124444991","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360438
Xiangning Fan, Li Tang, Xiaomin Si, Zaijun Hua
This paper designs a LC-VCO in the frequency synthesizer for wireless sensor network applications. The whole system is based on 1V low voltage with the process of TSMC 0.18μm RF-CMOS. The negative resistor pair is provided by cross-coupled PMOS transistors and the source of tail current is provided by NMOS transistor. Switched capacitor array is used to extend the frequency range. Technologies of second harmonic filter and large capacitor filter are introduced to further improve the phase noise performance. Switched currents source technology is also adopted to save the power. A output buffer with two stage of common-source is applied to drive the output signal and prevent external interference. Final on-chip test results show that the chip area is about 0.86mm × 0.73mm = 0.63mm2, the core power of the VCO is from 2.7 to 4.1mW, the power of output buffer stage is from 5.7 to 6.1mW respectively, the output frequency range is from 4.66 to 6.78GHz with 37% large tuning range, and phase noise is as low as from -94 to -108dBc/Hz@ 1MHz and from -104 to -124dBc/Hz@3.5MHz respectively.
{"title":"Design of a broadband VCO for WSN applications","authors":"Xiangning Fan, Li Tang, Xiaomin Si, Zaijun Hua","doi":"10.1109/COMCAS.2015.7360438","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360438","url":null,"abstract":"This paper designs a LC-VCO in the frequency synthesizer for wireless sensor network applications. The whole system is based on 1V low voltage with the process of TSMC 0.18μm RF-CMOS. The negative resistor pair is provided by cross-coupled PMOS transistors and the source of tail current is provided by NMOS transistor. Switched capacitor array is used to extend the frequency range. Technologies of second harmonic filter and large capacitor filter are introduced to further improve the phase noise performance. Switched currents source technology is also adopted to save the power. A output buffer with two stage of common-source is applied to drive the output signal and prevent external interference. Final on-chip test results show that the chip area is about 0.86mm × 0.73mm = 0.63mm2, the core power of the VCO is from 2.7 to 4.1mW, the power of output buffer stage is from 5.7 to 6.1mW respectively, the output frequency range is from 4.66 to 6.78GHz with 37% large tuning range, and phase noise is as low as from -94 to -108dBc/Hz@ 1MHz and from -104 to -124dBc/Hz@3.5MHz respectively.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115939633","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360420
O. Shaham, Y. Michlin
An improvement of IEC-61123 in the field of sequential probability ratio test (SPRT) is proposed. The current standard does not provide a proper solution for modern industry's needs, and the test plans are not up-to-date with the knowledge in the area of sequential tests. The advantages of the proposed version are reflected by the efficacy and accuracy of the tests, the wider range of the ready to use test's parameters, and available data regarding the test's characteristics. The proposed version is a significant improvement over the existing one. The changes will extend the use of SPRT and this standard.
{"title":"A proposal for updating the standard IEC-61123 - compliance test plans for success ratio","authors":"O. Shaham, Y. Michlin","doi":"10.1109/COMCAS.2015.7360420","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360420","url":null,"abstract":"An improvement of IEC-61123 in the field of sequential probability ratio test (SPRT) is proposed. The current standard does not provide a proper solution for modern industry's needs, and the test plans are not up-to-date with the knowledge in the area of sequential tests. The advantages of the proposed version are reflected by the efficacy and accuracy of the tests, the wider range of the ready to use test's parameters, and available data regarding the test's characteristics. The proposed version is a significant improvement over the existing one. The changes will extend the use of SPRT and this standard.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130744633","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360417
D. Filonov, A. Shalin, P. Belov, P. Ginzburg
Tailoring electrodynamical phenomena of radiation, emission, and scattering with auxiliary surrounding structuring is one of primary objectives of fundamental and applied investigations nowadays. Resent interests in optical frequency range are partially related to engineering of light-matter interaction dynamics with applications to invisibility cloaking, quantum information devices, optical interconnects and others. Many of frontier proposals, however, are still at the proof of concept stage and require reliable verifications. While performing and analyzing results of optical experiments are sometimes challenging due to their involved complexity related to nano-scale structuring, experimental platform and fabrication of radio waves devices is relatively straightforward. Being able to emulate a span of optical phenomena with GHz frequencies, we demonstrate the way of tailoring scattering characteristics of objects, embedded in wire metamaterial. Regimes of scattering suppression and super-scattering were investigated and the relations to optical effects were discussed. Furthermore, emulation experiments on other effects, among them the near-field interference, causing directional excitation of waves propagating in hyperbolic metamaterials and invisibility cloaking will be reviewed. The ability to detect both near and far fields at the GHz range opens vast opportunities for emulation experiments of different kinds.
{"title":"Emulation of complex optical phenomena with radio waves: Tailoring scattering characteristics with wire metamaterial","authors":"D. Filonov, A. Shalin, P. Belov, P. Ginzburg","doi":"10.1109/COMCAS.2015.7360417","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360417","url":null,"abstract":"Tailoring electrodynamical phenomena of radiation, emission, and scattering with auxiliary surrounding structuring is one of primary objectives of fundamental and applied investigations nowadays. Resent interests in optical frequency range are partially related to engineering of light-matter interaction dynamics with applications to invisibility cloaking, quantum information devices, optical interconnects and others. Many of frontier proposals, however, are still at the proof of concept stage and require reliable verifications. While performing and analyzing results of optical experiments are sometimes challenging due to their involved complexity related to nano-scale structuring, experimental platform and fabrication of radio waves devices is relatively straightforward. Being able to emulate a span of optical phenomena with GHz frequencies, we demonstrate the way of tailoring scattering characteristics of objects, embedded in wire metamaterial. Regimes of scattering suppression and super-scattering were investigated and the relations to optical effects were discussed. Furthermore, emulation experiments on other effects, among them the near-field interference, causing directional excitation of waves propagating in hyperbolic metamaterials and invisibility cloaking will be reviewed. The ability to detect both near and far fields at the GHz range opens vast opportunities for emulation experiments of different kinds.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116860121","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360364
R. Rotman
Tumours remain a common and challenging multidisciplinary clinical problem, and there is a constant need for innovative tumour diagnostic and treatments modalities that are accurate, efficacious, harmless and cost effective. Microwaves and RF will provide in the near future an alternative to present systems. Primary hepatocellular carcinoma (HCC) and metastatic colorectal hepatic metastasis tumours are the most common liver malignancies encountered Worldwide, HCC ranks the sixth most common malignancy and the third most common cause of cancer-related death. Proper diagnosis and monitoring of hepatic tumours is paramount for the recovery of liver cancer patients.
{"title":"Microwave diagnostics for ablation of the liver","authors":"R. Rotman","doi":"10.1109/COMCAS.2015.7360364","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360364","url":null,"abstract":"Tumours remain a common and challenging multidisciplinary clinical problem, and there is a constant need for innovative tumour diagnostic and treatments modalities that are accurate, efficacious, harmless and cost effective. Microwaves and RF will provide in the near future an alternative to present systems. Primary hepatocellular carcinoma (HCC) and metastatic colorectal hepatic metastasis tumours are the most common liver malignancies encountered Worldwide, HCC ranks the sixth most common malignancy and the third most common cause of cancer-related death. Proper diagnosis and monitoring of hepatic tumours is paramount for the recovery of liver cancer patients.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121991893","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360425
A. Sainath, Ernando L. Teixeira
We explore limitations of cylindrical, convex Perfectly Matched Layer (PML) media. Although concave PMLs are routinely used in numerical electromagnetic (EM) simulations, convex PML media are of particular interest as possible blueprints for realizing EM absorber coatings. The design challenge however involves removing the gain medium behavior. As the paper's central result we show that passive convex PMLs necessarily mandate an EM “horizon” in order to satisfy energy conservation.
{"title":"Analysis of convex PML media","authors":"A. Sainath, Ernando L. Teixeira","doi":"10.1109/COMCAS.2015.7360425","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360425","url":null,"abstract":"We explore limitations of cylindrical, convex Perfectly Matched Layer (PML) media. Although concave PMLs are routinely used in numerical electromagnetic (EM) simulations, convex PML media are of particular interest as possible blueprints for realizing EM absorber coatings. The design challenge however involves removing the gain medium behavior. As the paper's central result we show that passive convex PMLs necessarily mandate an EM “horizon” in order to satisfy energy conservation.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115800487","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360410
Zeev Kustanovich, Y. Levron
This paper demonstrates the use of compressive sensing methods for locating sources of harmonic distortion in power networks. It is shown that the number of sensors required to locate a source of harmonic distortion is typically small, and proportional to the number of suspicious sources. Simulations show that any 2 sources of harmonic distortion can be located using 6 sensors in a 50 bus power system.
{"title":"Applications of compressed sensing for locating harmonic distortions in power systems","authors":"Zeev Kustanovich, Y. Levron","doi":"10.1109/COMCAS.2015.7360410","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360410","url":null,"abstract":"This paper demonstrates the use of compressive sensing methods for locating sources of harmonic distortion in power networks. It is shown that the number of sensors required to locate a source of harmonic distortion is typically small, and proportional to the number of suspicious sources. Simulations show that any 2 sources of harmonic distortion can be located using 6 sensors in a 50 bus power system.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125673148","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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