Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360461
I. Gershenzon, Y. Brick, A. Boag
A novel iterative physical optics (IPO) algorithm is proposed, for the analysis of scattering from large complex geometries involving multiple reflections and complex self-shadowing effects. The algorithm involves two types of nested iterations: reflection (“bounce”) iterations and self-shadowing iterations. At each bounce iteration, the physical optics sources induced on the surface of the scatterer produce a correction to the incident field, which in turn creates a correction to the physical optics sources. Each correction is evaluated to account for self-shadowing effects by a nested iterative evaluation of shadow-radiation integrals. The nested iterative formulation is naturally accelerable by using fast field evaluation methods, e.g., the multilevel non-uniform grid algorithm. The procedure's applicability to complex geometries is demonstrated numerically by comparison to numerically exact results and to standard PO results.
{"title":"Iterative physical optics (IPO) with integral evaluation of self-shadowing","authors":"I. Gershenzon, Y. Brick, A. Boag","doi":"10.1109/COMCAS.2015.7360461","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360461","url":null,"abstract":"A novel iterative physical optics (IPO) algorithm is proposed, for the analysis of scattering from large complex geometries involving multiple reflections and complex self-shadowing effects. The algorithm involves two types of nested iterations: reflection (“bounce”) iterations and self-shadowing iterations. At each bounce iteration, the physical optics sources induced on the surface of the scatterer produce a correction to the incident field, which in turn creates a correction to the physical optics sources. Each correction is evaluated to account for self-shadowing effects by a nested iterative evaluation of shadow-radiation integrals. The nested iterative formulation is naturally accelerable by using fast field evaluation methods, e.g., the multilevel non-uniform grid algorithm. The procedure's applicability to complex geometries is demonstrated numerically by comparison to numerically exact results and to standard PO results.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128408035","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360385
M. Merzer, Y. Kantor, Lior Rodes
Bonding chips to substrates is usually done at high temperatures. After adhesion the system cools down. When the adherends have different thermal properties, the intermediate adhesive becomes subject to large distortions that can cause fracture or failure. Strains and stresses in such configurations can be computed using numerical methods, but they are usually cumbersome. More desirable is an analytic algorithm giving instant albeit approximate results. An analytic formulation that computes quickly stresses within the adhesive is presented together with an example. For this example a simpler analytic formulation is found to give similar results giving support to the primary analysis.
{"title":"A quick tool for assessing mechanical stresses in adhesives between chip & substrate","authors":"M. Merzer, Y. Kantor, Lior Rodes","doi":"10.1109/COMCAS.2015.7360385","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360385","url":null,"abstract":"Bonding chips to substrates is usually done at high temperatures. After adhesion the system cools down. When the adherends have different thermal properties, the intermediate adhesive becomes subject to large distortions that can cause fracture or failure. Strains and stresses in such configurations can be computed using numerical methods, but they are usually cumbersome. More desirable is an analytic algorithm giving instant albeit approximate results. An analytic formulation that computes quickly stresses within the adhesive is presented together with an example. For this example a simpler analytic formulation is found to give similar results giving support to the primary analysis.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"80 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114049981","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360397
I. Rozenberg, Y. Levron
Compressed sensing is an emerging signal processing method that finds applications in diverse estimation problems. This paper shows that power systems events may be analyzed in terms of sparse structures, especially if the probability of their occurrence within a power network is low. The paper presents several examples for such events, and suggests methods for locating them within large power systems using few measurements. Several types of sparse events are analyzed: faults, lightning strikes, polluting loads, and electricity thefts.
{"title":"Applications of compressed sensing and sparse representations for state estimation in power systems","authors":"I. Rozenberg, Y. Levron","doi":"10.1109/COMCAS.2015.7360397","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360397","url":null,"abstract":"Compressed sensing is an emerging signal processing method that finds applications in diverse estimation problems. This paper shows that power systems events may be analyzed in terms of sparse structures, especially if the probability of their occurrence within a power network is low. The paper presents several examples for such events, and suggests methods for locating them within large power systems using few measurements. Several types of sparse events are analyzed: faults, lightning strikes, polluting loads, and electricity thefts.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121405051","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360459
Xiao Dong, Yunhua Zhang, Xiang Gu, W. Zhai
This paper proposes a new method for inverse synthetic aperture radar (ISAR) imaging of multiple targets based on sparse representations. The proposed method includes three steps: (1) coarse estimation of the radial velocities of the targets using Radon transform; (2) signal separation of different targets using sparse representation (SR) method; (3) refocusing of each targets using traditional range-Doppler algorithm. The effectiveness of the proposed method is verified using real ISAR data.
{"title":"ISAR imaging of multiple targets based on sparse representations","authors":"Xiao Dong, Yunhua Zhang, Xiang Gu, W. Zhai","doi":"10.1109/COMCAS.2015.7360459","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360459","url":null,"abstract":"This paper proposes a new method for inverse synthetic aperture radar (ISAR) imaging of multiple targets based on sparse representations. The proposed method includes three steps: (1) coarse estimation of the radial velocities of the targets using Radon transform; (2) signal separation of different targets using sparse representation (SR) method; (3) refocusing of each targets using traditional range-Doppler algorithm. The effectiveness of the proposed method is verified using real ISAR data.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"59 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116890690","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360489
A. Zviagintsev, I. Brouk, I. Bloom, Y. Nemirovsky
Novel uncooled thermal sensor based on a suspended transistor (TMOS) made in standard CMOS-SOI process and released by post-etching, has been developed at Technion. The transient Self-heating thermal effect analysis of TMOS sensors operated either in saturation or subthreshold is presented. This work establishes an analytical analysis of a novel approach drastically reducing the self-heating thermal effect in TMOS sensors. This is achieved by a bridge-like circuit and utilizing a sensor and a reference device with similar thermal capacitance and different thermal conductivity. The self-heating effect is significantly reduced while operating in subthreshold. Thus emphasizing the advantages of the subthreshold operation point: battery operation as well as reduced self-heating.
{"title":"Self- heating effects in CMOS-SOI-NEMS transistors for uncooled passive IR sensors","authors":"A. Zviagintsev, I. Brouk, I. Bloom, Y. Nemirovsky","doi":"10.1109/COMCAS.2015.7360489","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360489","url":null,"abstract":"Novel uncooled thermal sensor based on a suspended transistor (TMOS) made in standard CMOS-SOI process and released by post-etching, has been developed at Technion. The transient Self-heating thermal effect analysis of TMOS sensors operated either in saturation or subthreshold is presented. This work establishes an analytical analysis of a novel approach drastically reducing the self-heating thermal effect in TMOS sensors. This is achieved by a bridge-like circuit and utilizing a sensor and a reference device with similar thermal capacitance and different thermal conductivity. The self-heating effect is significantly reduced while operating in subthreshold. Thus emphasizing the advantages of the subthreshold operation point: battery operation as well as reduced self-heating.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"6 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121001233","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360457
Benjamin R. Epstein
“Digital at every element” (elemental digital) arrays have many compelling advantages, at least in theory. A persistent drawback of elemental digital arrays has been their perceived high costs and the challenges of placing high performance data converters at each element. New device technologies and fabrication lines are beginning to break down the cost challenge, making elemental digital arrays of any size worthy of consideration for a wide variety of applications.
{"title":"Digital phased arrays: Are they worth the cost?","authors":"Benjamin R. Epstein","doi":"10.1109/COMCAS.2015.7360457","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360457","url":null,"abstract":"“Digital at every element” (elemental digital) arrays have many compelling advantages, at least in theory. A persistent drawback of elemental digital arrays has been their perceived high costs and the challenges of placing high performance data converters at each element. New device technologies and fabrication lines are beginning to break down the cost challenge, making elemental digital arrays of any size worthy of consideration for a wide variety of applications.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122026616","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360487
R. Abdullin, S. Shabunin
A leaky-wave antenna based on two-layer substrate integrated waveguide with transverse slots and protective dielectric cover is investigated. A dispersion equation, that allows finding the complex propagation constant in the structure, is obtained. Velocity factor dependencies on the position of slots, protective cover permittivity and filling factor are presented. The possibility of using the metamaterial in studied design is estimated. The influence of substrate composition on the antenna characteristics is analyzed.
{"title":"Performance calculation of leaky-wave antenna based on substrate integrated waveguide with transverse slots","authors":"R. Abdullin, S. Shabunin","doi":"10.1109/COMCAS.2015.7360487","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360487","url":null,"abstract":"A leaky-wave antenna based on two-layer substrate integrated waveguide with transverse slots and protective dielectric cover is investigated. A dispersion equation, that allows finding the complex propagation constant in the structure, is obtained. Velocity factor dependencies on the position of slots, protective cover permittivity and filling factor are presented. The possibility of using the metamaterial in studied design is estimated. The influence of substrate composition on the antenna characteristics is analyzed.","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":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126514631","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360482
D. Letavin, Y. E. Mitelman, V. Chechetkin
This article is dedicated to the new procedure of synthesizing microwave devices which provides size reduction of conventional microstrip structures. In the proposed method traditional transmission lines are replaced with microstrip lowpass filters having the same phase response on the frequency of interest. As an example the usage of this procedure is shown on miniaturization of a branch-line coupler with the central frequency of 2 GHz. Area occupied by the compact coupler is about 3 times less than of the conventional one.
{"title":"A novel method of design of miniaturized microstrip microwave devices using filters","authors":"D. Letavin, Y. E. Mitelman, V. Chechetkin","doi":"10.1109/COMCAS.2015.7360482","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360482","url":null,"abstract":"This article is dedicated to the new procedure of synthesizing microwave devices which provides size reduction of conventional microstrip structures. In the proposed method traditional transmission lines are replaced with microstrip lowpass filters having the same phase response on the frequency of interest. As an example the usage of this procedure is shown on miniaturization of a branch-line coupler with the central frequency of 2 GHz. Area occupied by the compact coupler is about 3 times less than of the conventional one.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130526129","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360458
A. Rudiakova, R. Sinitsyn, F. Yanovsky
In this paper we introduce and check a new description of polarimetric parameters that are asymptotically invariant to the group of all monotonous transformations of input signals. In particular, this can give a possibility to estimate pure correlation between polarimetric signals independently on statistical characteristics of initial data. This copula-based approach is applied to signal processing in polarimetric meteorological radar.
{"title":"Invariant polarimetric parameters for signal processing in weather radar","authors":"A. Rudiakova, R. Sinitsyn, F. Yanovsky","doi":"10.1109/COMCAS.2015.7360458","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360458","url":null,"abstract":"In this paper we introduce and check a new description of polarimetric parameters that are asymptotically invariant to the group of all monotonous transformations of input signals. In particular, this can give a possibility to estimate pure correlation between polarimetric signals independently on statistical characteristics of initial data. This copula-based approach is applied to signal processing in polarimetric meteorological radar.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123099222","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 : 2015-11-01DOI: 10.1109/COMCAS.2015.7360446
U. Guvenc, O. Palamutçuogullari, B. Yarman
In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable for the wide band applications and has a unique mechanism to prevent the LO to RF leakage which results in DC offset at the output. Simulations are performed and according to the simulation results, 21dB of conversion voltage gain is obtained within 2-12 GHz RF range while the DC voltage component at the output stays more than 80dB below the IF component.
{"title":"Zero-if second harmonic SiGe mixer with DC offset cancellation","authors":"U. Guvenc, O. Palamutçuogullari, B. Yarman","doi":"10.1109/COMCAS.2015.7360446","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360446","url":null,"abstract":"In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable for the wide band applications and has a unique mechanism to prevent the LO to RF leakage which results in DC offset at the output. Simulations are performed and according to the simulation results, 21dB of conversion voltage gain is obtained within 2-12 GHz RF range while the DC voltage component at the output stays more than 80dB below the IF component.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133379133","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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