Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460346
Y. Kovshov, S. Ponomarenko, S. Kishko, A. Likhachev, A. Danik, L. Mospan, S. Steshenko, E. Khutoryan, A. Kuleshov
The effect of transformation of slow grating modes into fast ones and vice versa is considered theoretically and implemented for the clinotron beam-wave interaction model. Strong resonant properties of a clinotron due to fast waves transformations were theoretically predicted even in the case of strong attenuation of the surface mode. Experimental study of the 300 GHz CW clinotron has been carried out. Simulation results were compared with experimental ones, elucidating strong resonances in a clinotron.
{"title":"Demonstration of a Mode Transformation Effect in 300-GHz CW Clinotron","authors":"Y. Kovshov, S. Ponomarenko, S. Kishko, A. Likhachev, A. Danik, L. Mospan, S. Steshenko, E. Khutoryan, A. Kuleshov","doi":"10.1109/MMET.2018.8460346","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460346","url":null,"abstract":"The effect of transformation of slow grating modes into fast ones and vice versa is considered theoretically and implemented for the clinotron beam-wave interaction model. Strong resonant properties of a clinotron due to fast waves transformations were theoretically predicted even in the case of strong attenuation of the surface mode. Experimental study of the 300 GHz CW clinotron has been carried out. Simulation results were compared with experimental ones, elucidating strong resonances in a clinotron.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116141700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460382
A. O. Natarova, N. Kokodiy
In the paper presented are results of investigation of the interaction of laser radiation with grid bolometric receivers, subsequent processing of signals using specially developed algorithms and determination of the space-energy, polarization, and time characteristics of laser radiation. For determining of radiation intensity distribution, direction of polarization and shape of the radiation pulse it has been used the Radon transform for processing of signals.
{"title":"Processing of Signals from the Grid Receiver for Measuring of Laser Radiation Characteristics","authors":"A. O. Natarova, N. Kokodiy","doi":"10.1109/MMET.2018.8460382","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460382","url":null,"abstract":"In the paper presented are results of investigation of the interaction of laser radiation with grid bolometric receivers, subsequent processing of signals using specially developed algorithms and determination of the space-energy, polarization, and time characteristics of laser radiation. For determining of radiation intensity distribution, direction of polarization and shape of the radiation pulse it has been used the Radon transform for processing of signals.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131269962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460368
O. Gurin, A. Degtyarev, M. Dubinin, V. Maslov, K. Muntean, V. Ryabykh
Theoretically, based on the Rayleigh-Sommerfeld vector theory using the radiation of a waveguide terahertz laser (λ = 432.6 μm), physical features of moderate and sharp focusing of radiation beams were studied. Laser beams are excited by the modes of a laser cavity based on a circular metal waveguide for inhomogeneous spatial polarization of the field. It is shown that in the focal region of the lens, in the case of a moderate and sharp focusing of the radiation beam excited by the TM11 mode with a nonuniform polarization, a minimum of its axial intensity is observed. It is due to the significant influence in this case of the intensity of the longitudinal component of the field of the given mode. The obtained results expand the knowledge about the features of the focusing for the laser beams of terahertz range.
{"title":"Focusing of Modes for Metallic Resonator of a Terahertz Laser with Nonuniform Spatial Polarization","authors":"O. Gurin, A. Degtyarev, M. Dubinin, V. Maslov, K. Muntean, V. Ryabykh","doi":"10.1109/MMET.2018.8460368","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460368","url":null,"abstract":"Theoretically, based on the Rayleigh-Sommerfeld vector theory using the radiation of a waveguide terahertz laser (λ = 432.6 μm), physical features of moderate and sharp focusing of radiation beams were studied. Laser beams are excited by the modes of a laser cavity based on a circular metal waveguide for inhomogeneous spatial polarization of the field. It is shown that in the focal region of the lens, in the case of a moderate and sharp focusing of the radiation beam excited by the TM11 mode with a nonuniform polarization, a minimum of its axial intensity is observed. It is due to the significant influence in this case of the intensity of the longitudinal component of the field of the given mode. The obtained results expand the knowledge about the features of the focusing for the laser beams of terahertz range.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130920919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460360
G. Koshovy
Classes of one-dimensional self-similar fractals with variable Hausdorff-Besicovitch dimension are presented. They can be used in the pre-fractal modelling in electromagnetic and acoustic wave theory: wave scattering by pre-fractal gratings and wave propagation in pre-fractal systems of microstrip lines.
{"title":"Modeling of Electromagnetic Wave Scattering and Propagation in the Presence of a Pre-Fractal PEC Strip Grating","authors":"G. Koshovy","doi":"10.1109/MMET.2018.8460360","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460360","url":null,"abstract":"Classes of one-dimensional self-similar fractals with variable Hausdorff-Besicovitch dimension are presented. They can be used in the pre-fractal modelling in electromagnetic and acoustic wave theory: wave scattering by pre-fractal gratings and wave propagation in pre-fractal systems of microstrip lines.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133269225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460319
Y. Kozhushko, D. Karlov, O. Klimishen, M. Bortsova, S. Herasymov, O. Hrichanuk, V. Bykov
The paper compares two fast algorithms, the normalized correlation algorithm and the generalized phase correlation algorithm, used for images superposition in aircraft map-matching navigation systems. It is shown that the normalized correlation algorithm appers to be more resistant to various geometry and brightness distortions.
{"title":"Comparison of the Efficiency of Some Images Superposition Algorithms Used in Aircraft Map-Matching Navigation Systems","authors":"Y. Kozhushko, D. Karlov, O. Klimishen, M. Bortsova, S. Herasymov, O. Hrichanuk, V. Bykov","doi":"10.1109/MMET.2018.8460319","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460319","url":null,"abstract":"The paper compares two fast algorithms, the normalized correlation algorithm and the generalized phase correlation algorithm, used for images superposition in aircraft map-matching navigation systems. It is shown that the normalized correlation algorithm appers to be more resistant to various geometry and brightness distortions.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114571916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460212
V. Hoblyk, N. Hoblyk
This work presents results of computer simulation of a flat reflective array of rectangular waveguides and results of the investigation of the influence of phase errors on the formation of the radiation field.
本文介绍了矩形波导平面反射阵列的计算机模拟结果和相位误差对辐射场形成影响的研究结果。
{"title":"Research and Development of Reflectarray Antennas","authors":"V. Hoblyk, N. Hoblyk","doi":"10.1109/MMET.2018.8460212","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460212","url":null,"abstract":"This work presents results of computer simulation of a flat reflective array of rectangular waveguides and results of the investigation of the influence of phase errors on the formation of the radiation field.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"20 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132360396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460252
A. Vertiy, P. Melezhik, A. Poyedinchuk, S. Mizrakhy, P. Nesterov
The inverse scattering problem is solved for layered dielectric slab located in the standard rectangular metal waveguide. The slab is comprised of conventional dielectric materials with a piecewise constant dielectric permittivity. Appropriate algorithm is developed for the dielectric permittivity profile reconstruction and is related to the Cauchy problem for the Riccati equation. The frequency dependencies of the complex reflection coefficients are measured by microwave vector network analyzers. The measured values of complex reflection coefficients are used as initial data for inverse scattering problem solution for finite number of frequencies. Reconstructed dielectric permittivity profiles for two and three layered slabs have a good agreement with measured ones.
{"title":"Dielectric Permittivity Profile Reconsctruction in Microwave Band for Layered Dielectric Slab Located in the Standard Metal Waveguide","authors":"A. Vertiy, P. Melezhik, A. Poyedinchuk, S. Mizrakhy, P. Nesterov","doi":"10.1109/MMET.2018.8460252","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460252","url":null,"abstract":"The inverse scattering problem is solved for layered dielectric slab located in the standard rectangular metal waveguide. The slab is comprised of conventional dielectric materials with a piecewise constant dielectric permittivity. Appropriate algorithm is developed for the dielectric permittivity profile reconstruction and is related to the Cauchy problem for the Riccati equation. The frequency dependencies of the complex reflection coefficients are measured by microwave vector network analyzers. The measured values of complex reflection coefficients are used as initial data for inverse scattering problem solution for finite number of frequencies. Reconstructed dielectric permittivity profiles for two and three layered slabs have a good agreement with measured ones.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128099352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460199
A. Lysenko, I. Volk, G. Oleksiienko
In the framework of method of averaged characteristics we demonstrated the application technique of modified asymptotic integration scheme. The technique was shown on the example of multiharmonic two-stream superheterodyne free-electron laser (TSFEL) with helical electron beam non-linear theory. We obtained the system of shortened differential equations for the amplitudes of interacting waves. This system considers diverse types of plural parametric interactions. We demonstrated that investigated multiharmonic TSFEL with helical relativistic electron beams (REBs) are characterized by higher electromagnetic waves amplification rates compared with TSFELs based on straight beams. It allows to reduce the longitudinal dimensions of the devices. We found out that width of electromagnetic signal frequency spectrum forming in multiharmonic TSFELs with helical REBs is bigger compared with frequency spectrum width in similar TSFELs using straight REBs.
{"title":"Application of Modified Asymptotic Integration Scheme in Theory of Multiharmonic Two-Stream FELs with Helical Electron Beams","authors":"A. Lysenko, I. Volk, G. Oleksiienko","doi":"10.1109/MMET.2018.8460199","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460199","url":null,"abstract":"In the framework of method of averaged characteristics we demonstrated the application technique of modified asymptotic integration scheme. The technique was shown on the example of multiharmonic two-stream superheterodyne free-electron laser (TSFEL) with helical electron beam non-linear theory. We obtained the system of shortened differential equations for the amplitudes of interacting waves. This system considers diverse types of plural parametric interactions. We demonstrated that investigated multiharmonic TSFEL with helical relativistic electron beams (REBs) are characterized by higher electromagnetic waves amplification rates compared with TSFELs based on straight beams. It allows to reduce the longitudinal dimensions of the devices. We found out that width of electromagnetic signal frequency spectrum forming in multiharmonic TSFELs with helical REBs is bigger compared with frequency spectrum width in similar TSFELs using straight REBs.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133883630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460455
M. Hammer, L. Ebers, A. Hildebrandt, Samer Alhaddad, J. Förstner
Semi-guided waves confined in dielectric slab waveguides are being considered for oblique angles of propagation. If the waves encounter a linear discontinuity of (mostly) arbitrary shape and extension, a variant of Snell's law applies, separately for each pair of incoming and outgoing modes. Depending on the effective indices involved, and on the angle of incidence, power transfer to specific outgoing waves can be allowed or forbidden. In particular, critical angles of incidence can be identified, beyond which any power transfer to non-guided waves is forbidden, i.e. all radiative losses are suppressed. In that case the input power is carried away from the discontinuity exclusively by reflected semi-guided waves in the input slab, or by semi-guided waves that are transmitted into other outgoing slab waveguides. Vectorial equations on a 2-D cross sectional domain apply. These are formally identical to the equations that govern the eigenmodes of 3-D channel waveguides. Here, however, these need to be solved not as an eigenvalue problem, but as an inhomogeneous problem with a right-hand-side that is given by the incoming semi-guided wave, and subject to transparent boundary conditions. The equations resemble a standard 2-D Helmholtz problem, with an effective permittivity in place of the actual relative permittivity. Depending on the properties of the incoming wave, including the angle of incidence, this effective permittivity can become locally negative, causing the suppression of propagating outgoing waves. A series of high-contrast example configurations are discussed, where these effects lead to - in some respects - quite surprising transmission characteristics.
{"title":"Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity","authors":"M. Hammer, L. Ebers, A. Hildebrandt, Samer Alhaddad, J. Förstner","doi":"10.1109/MMET.2018.8460455","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460455","url":null,"abstract":"Semi-guided waves confined in dielectric slab waveguides are being considered for oblique angles of propagation. If the waves encounter a linear discontinuity of (mostly) arbitrary shape and extension, a variant of Snell's law applies, separately for each pair of incoming and outgoing modes. Depending on the effective indices involved, and on the angle of incidence, power transfer to specific outgoing waves can be allowed or forbidden. In particular, critical angles of incidence can be identified, beyond which any power transfer to non-guided waves is forbidden, i.e. all radiative losses are suppressed. In that case the input power is carried away from the discontinuity exclusively by reflected semi-guided waves in the input slab, or by semi-guided waves that are transmitted into other outgoing slab waveguides. Vectorial equations on a 2-D cross sectional domain apply. These are formally identical to the equations that govern the eigenmodes of 3-D channel waveguides. Here, however, these need to be solved not as an eigenvalue problem, but as an inhomogeneous problem with a right-hand-side that is given by the incoming semi-guided wave, and subject to transparent boundary conditions. The equations resemble a standard 2-D Helmholtz problem, with an effective permittivity in place of the actual relative permittivity. Depending on the properties of the incoming wave, including the angle of incidence, this effective permittivity can become locally negative, causing the suppression of propagating outgoing waves. A series of high-contrast example configurations are discussed, where these effects lead to - in some respects - quite surprising transmission characteristics.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132930160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460241
A. Lysenko, I. Volk, G. Oleksiienko
We have modified the method of averaged characteristics to solve multiharmonic problems in high-current devices that use a helical relativistic electron beams (REBs). We proposed a new substitution of variables in the framework of the averaged characteristics method. This substitution made it possible to increase the efficiency of the algorithm for solving the motion problem. We demonstrated the efficiency of the new scheme on the motion problems of a plasma-beam superheterodyne free-electron laser (SFEL) with the helical REB.
{"title":"Modified Scheme of Asymptotic Integration in Theory of Multiharmonic Devices of High-Current Electronics Using Helical Relativistic Electron Beams","authors":"A. Lysenko, I. Volk, G. Oleksiienko","doi":"10.1109/MMET.2018.8460241","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460241","url":null,"abstract":"We have modified the method of averaged characteristics to solve multiharmonic problems in high-current devices that use a helical relativistic electron beams (REBs). We proposed a new substitution of variables in the framework of the averaged characteristics method. This substitution made it possible to increase the efficiency of the algorithm for solving the motion problem. We demonstrated the efficiency of the new scheme on the motion problems of a plasma-beam superheterodyne free-electron laser (SFEL) with the helical REB.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124966962","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：