Pub Date : 2010-06-21DOI: 10.1109/MSMW.2010.5545988
B. Kutuza
The study of precipitation at the observation of the Earth from space is one of the important problems of remote sensing. For the first time the possibility of estimation of rain intensity by upwelling Earth radiation was shown by the experiment conducted on the satellite “Kosmos-243” in 1986 [1]. Areas of precipitation falling over sea surface were registered by typical emission of brightness temperature at wavelengths of 0.8, 1.35 and 3.2 cm. By the magnitude of emission several rain intensity levels may be distinguished. Further development of precipitation observation from space is related with American satellite DMSP with microwave radiometric system SSM/I [2], which received radiation in a wide range of wavelengths from 0.35 to 1.6 cm. This system made it possible to carry out the study of precipitation fields over the surface and sea. The precipitation in radiometric images appeared as areas with lower brightness temperature at 0.35 cm wavelength. This is accounted for by the increase of the Earth albedo due to multiple microwaves scattering on large rain drops. Over recent years the remote sensing of precipitation was conducted on Japan-USA satellite TRMM. A large project GPS (Global Precipitation Mission) is under preparation.
{"title":"Microwave emission properties of a precipitating atmosphere with respect to remote sensing of precipitation from space by means of microwave radiometry","authors":"B. Kutuza","doi":"10.1109/MSMW.2010.5545988","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5545988","url":null,"abstract":"The study of precipitation at the observation of the Earth from space is one of the important problems of remote sensing. For the first time the possibility of estimation of rain intensity by upwelling Earth radiation was shown by the experiment conducted on the satellite “Kosmos-243” in 1986 [1]. Areas of precipitation falling over sea surface were registered by typical emission of brightness temperature at wavelengths of 0.8, 1.35 and 3.2 cm. By the magnitude of emission several rain intensity levels may be distinguished. Further development of precipitation observation from space is related with American satellite DMSP with microwave radiometric system SSM/I [2], which received radiation in a wide range of wavelengths from 0.35 to 1.6 cm. This system made it possible to carry out the study of precipitation fields over the surface and sea. The precipitation in radiometric images appeared as areas with lower brightness temperature at 0.35 cm wavelength. This is accounted for by the increase of the Earth albedo due to multiple microwaves scattering on large rain drops. Over recent years the remote sensing of precipitation was conducted on Japan-USA satellite TRMM. A large project GPS (Global Precipitation Mission) is under preparation.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114971055","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5545997
M. Glyavin, A. Luchinin, V. Manuilov, M. Moiseev, A. Sedov, V. Zapevalov
One of the most important areas of the present microwaves investigations is development of radiation sources in the sub-Terahertz and Terahertz frequency bands (f ≥ 0.3 THz). Gyrotrons are capable of producing high-power coherent electromagnetic radiation in the millimeter wavelength ranges (see, for example, [1,2]) and looks promising for submillimeter and terahertz bands.
{"title":"Development of powerful terahertz gyrotrons","authors":"M. Glyavin, A. Luchinin, V. Manuilov, M. Moiseev, A. Sedov, V. Zapevalov","doi":"10.1109/MSMW.2010.5545997","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5545997","url":null,"abstract":"One of the most important areas of the present microwaves investigations is development of radiation sources in the sub-Terahertz and Terahertz frequency bands (f ≥ 0.3 THz). Gyrotrons are capable of producing high-power coherent electromagnetic radiation in the millimeter wavelength ranges (see, for example, [1,2]) and looks promising for submillimeter and terahertz bands.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115599389","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546044
A. V. Volodenko, O. Gurin, A. Degtyarev, V. Maslov, V. Svich, A. N. Topkov
We have studied theoretically and experimentally the spectral features of circular metal waveguides at terahertz wavelengths. For the first time it is shown that in the far region of the terahertz frequency range, where the conductivity of metal is high, at a wavelength of the transmitted radiation more than 50 µm spectrum of the waveguide can be represented by classical modal composition in the approximation of the ideal metal. In the near part of the terahertz range, where the conductivity of the metal substantially lower spectrum of waveguide modes of a hollow metallic waveguide can be described by a set of hybrid modes. The presence of the transition region in the behavior of electrodynamic properties of metallic waveguides in the wavelength range λ = 20 − 50 µm is founded. In this range the key parameter for estimation of the applica-bility of the mode approaches is the ratio of the exciting beam radius w to the waveguide radius a (w0 = w/a). Thus, when analyzing the transmission of terahertz laser radiation on small sized metal waveguide (a/γ ≤ 50) using in calculating the approximation of hybrid modes can only be justified if the excitation waveguides relatively high in relation to the radius of the waveguide beam radiation (w0 > 0,4). In the case of excitation of waveguides by narrow beams of radiation (w0 < 0,4), metal waveguides can retain electromagnetic properties inherent in the ideal metal waveguides.
{"title":"Calculation of transmitted characteristics for metal waveguides in terahertz range","authors":"A. V. Volodenko, O. Gurin, A. Degtyarev, V. Maslov, V. Svich, A. N. Topkov","doi":"10.1109/MSMW.2010.5546044","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546044","url":null,"abstract":"We have studied theoretically and experimentally the spectral features of circular metal waveguides at terahertz wavelengths. For the first time it is shown that in the far region of the terahertz frequency range, where the conductivity of metal is high, at a wavelength of the transmitted radiation more than 50 µm spectrum of the waveguide can be represented by classical modal composition in the approximation of the ideal metal. In the near part of the terahertz range, where the conductivity of the metal substantially lower spectrum of waveguide modes of a hollow metallic waveguide can be described by a set of hybrid modes. The presence of the transition region in the behavior of electrodynamic properties of metallic waveguides in the wavelength range λ = 20 − 50 µm is founded. In this range the key parameter for estimation of the applica-bility of the mode approaches is the ratio of the exciting beam radius w to the waveguide radius a (w0 = w/a). Thus, when analyzing the transmission of terahertz laser radiation on small sized metal waveguide (a/γ ≤ 50) using in calculating the approximation of hybrid modes can only be justified if the excitation waveguides relatively high in relation to the radius of the waveguide beam radiation (w0 > 0,4). In the case of excitation of waveguides by narrow beams of radiation (w0 < 0,4), metal waveguides can retain electromagnetic properties inherent in the ideal metal waveguides.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116856884","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546203
Y. Tuchkin, O. Suvorova, F. Dikmen
An accurate and efficient simulation of hollow waveguides is in demand for many practical applications including those in the area of microwave engineering. But very many numerical methods produce ill conditioned matrix that getting correct results needs various numerical experiments (see, for example, [1], where the authors mentioned the instability of the method for the matrices of big sizes). Thus, some alternative numerically stable and efficient approach is in demand. Our algorithm based on Analytical Regularization Method [2]–[3], adopted in this paper for spectral problems, brings just such alternative to, at least, the hollow waveguide modeling considered herein.
{"title":"Super-algebraically convergent mathematical model of hollow waveguldes by Analytical Regularization Method","authors":"Y. Tuchkin, O. Suvorova, F. Dikmen","doi":"10.1109/MSMW.2010.5546203","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546203","url":null,"abstract":"An accurate and efficient simulation of hollow waveguides is in demand for many practical applications including those in the area of microwave engineering. But very many numerical methods produce ill conditioned matrix that getting correct results needs various numerical experiments (see, for example, [1], where the authors mentioned the instability of the method for the matrices of big sizes). Thus, some alternative numerically stable and efficient approach is in demand. Our algorithm based on Analytical Regularization Method [2]–[3], adopted in this paper for spectral problems, brings just such alternative to, at least, the hollow waveguide modeling considered herein.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120970330","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546085
G. Glibitskiy, V. Maleev, E. V. Izhyk
The cell for measurement of dielectric permittivity is intended for research of properties of water solutions in the range of temperatures from 0 to 70°C in a range of frequencies of 30–40 GHz. The simplified construction of a cell is presented on Fig.1. The cell consists of the camera for solution and insert. The camera for a solution consists from waveguide flange with a segment of a circular waveguide 1, capacities for a solution 2, insert for the thermometer 3 with an entry branch pipe for flood filling of a solution, an output branch pipe for change of a solution 4. The segment of a circular waveguide has round deepening for glass tight laying from side capacities for a solution. The insert consists from waveguide a flange with a segment of a circular waveguide 5 and tanks 6 with a cylindrical part. The tank has round deepening for glass tight laying from side capacities for a solution also. Glass tight layings are pasted compound glue. The camera and an insert are made of stainless steel and incorporate by screws. Laying from high-temperature moisture resistant rubber is allocated between the camera and an insert for hermetic connection. The camera and insert have plane side surfaces. Heating units are attached to these surfaces by means of slices. The heating unit represents twelve ceramic resistances (on six cells from each side) with admissible power of 10 Watt everyone and with rating value of 72 Ohm. Resistances are connected in a parallel way. For cell heating the heating unit was connected to an alternating voltage source which regulated a range from 5 to 10 Volt so that speed of heating of a solution in a cell was no more than one degree for two minutes.
{"title":"Cell for measurement of dielectric permittivity of solutions","authors":"G. Glibitskiy, V. Maleev, E. V. Izhyk","doi":"10.1109/MSMW.2010.5546085","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546085","url":null,"abstract":"The cell for measurement of dielectric permittivity is intended for research of properties of water solutions in the range of temperatures from 0 to 70°C in a range of frequencies of 30–40 GHz. The simplified construction of a cell is presented on Fig.1. The cell consists of the camera for solution and insert. The camera for a solution consists from waveguide flange with a segment of a circular waveguide 1, capacities for a solution 2, insert for the thermometer 3 with an entry branch pipe for flood filling of a solution, an output branch pipe for change of a solution 4. The segment of a circular waveguide has round deepening for glass tight laying from side capacities for a solution. The insert consists from waveguide a flange with a segment of a circular waveguide 5 and tanks 6 with a cylindrical part. The tank has round deepening for glass tight laying from side capacities for a solution also. Glass tight layings are pasted compound glue. The camera and an insert are made of stainless steel and incorporate by screws. Laying from high-temperature moisture resistant rubber is allocated between the camera and an insert for hermetic connection. The camera and insert have plane side surfaces. Heating units are attached to these surfaces by means of slices. The heating unit represents twelve ceramic resistances (on six cells from each side) with admissible power of 10 Watt everyone and with rating value of 72 Ohm. Resistances are connected in a parallel way. For cell heating the heating unit was connected to an alternating voltage source which regulated a range from 5 to 10 Volt so that speed of heating of a solution in a cell was no more than one degree for two minutes.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125956043","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5545991
S. Gevorgian, A. Vorobiev
Ferroelectrics and multiferroics are materials of choice when it comes to development of agile microwave components. Due to the reach variety of physical properties (tunable dielectric, acoustic, optical, magnetic) they offer integration possibility of multiple microwave functionalities on a single substrate. Excellent dielectric properties of these materials allow high power handling capability, low controlling power consumption. The agile microwave components based on them are characterized by fast (sub-nanosecond) tuning speeds and high reliability. The full industrial scale exploitation of these advantages is a matter of time.
{"title":"Microwave and THz applications of ferroelectrics and multiferroics","authors":"S. Gevorgian, A. Vorobiev","doi":"10.1109/MSMW.2010.5545991","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5545991","url":null,"abstract":"Ferroelectrics and multiferroics are materials of choice when it comes to development of agile microwave components. Due to the reach variety of physical properties (tunable dielectric, acoustic, optical, magnetic) they offer integration possibility of multiple microwave functionalities on a single substrate. Excellent dielectric properties of these materials allow high power handling capability, low controlling power consumption. The agile microwave components based on them are characterized by fast (sub-nanosecond) tuning speeds and high reliability. The full industrial scale exploitation of these advantages is a matter of time.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115520045","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546030
Y. Kamenev, V. Korzh, F. Sizov, N. Momot
Preliminary estimates [1] showed that a narrow gap semiconductor with bipolar conductivity Hg1−xCdxTe (x ∼ 0,2) may have a detecting properties at temperatures T ∼ (78 – 300) K (temperature range, which maintains bipolar conductivity) with unlimited spectral range. Completed experiments [2] at a wavelength λ ∼ 8 mm have shown that the volt-watt sensitivity of such models can reach up to 2 V/W and the calculated equivalent noise power was equal to 3.5·10−10 W/Hz1/2, which is comparable with rectifier type receivers in the millimeter and submillimeter ranges.
{"title":"Ambipolar semiconductor receiver application in THz range","authors":"Y. Kamenev, V. Korzh, F. Sizov, N. Momot","doi":"10.1109/MSMW.2010.5546030","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546030","url":null,"abstract":"Preliminary estimates [1] showed that a narrow gap semiconductor with bipolar conductivity Hg<inf>1−x</inf>Cd<inf>x</inf>Te (x ∼ 0,2) may have a detecting properties at temperatures T ∼ (78 – 300) K (temperature range, which maintains bipolar conductivity) with unlimited spectral range. Completed experiments [2] at a wavelength λ ∼ 8 mm have shown that the volt-watt sensitivity of such models can reach up to 2 V/W and the calculated equivalent noise power was equal to 3.5·10<sup>−10</sup> W/Hz<sup>1/2</sup>, which is comparable with rectifier type receivers in the millimeter and submillimeter ranges.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"35 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116549026","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546018
V. Kravchenko, D. Churikov
Proposed and justified a modification of the spectral kernels that satisfy the Nagy criteria. Shown that obtained structures have some advantages in comparison with spectral wave analysis of UWB signals. Conducted numerical experiments confirm their effectiveness in problems of digital processing of UWB signals.
{"title":"Modified nagy kernels in digital UWB signal processing","authors":"V. Kravchenko, D. Churikov","doi":"10.1109/MSMW.2010.5546018","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546018","url":null,"abstract":"Proposed and justified a modification of the spectral kernels that satisfy the Nagy criteria. Shown that obtained structures have some advantages in comparison with spectral wave analysis of UWB signals. Conducted numerical experiments confirm their effectiveness in problems of digital processing of UWB signals.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116584917","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546075
O. Dumin, D. Shyrokorad, O. Dumina, V. Katrich, V. Chebotarev
The approximating properties of artificial neural network for the problem of determination of thickness a layer of layered medium by means of the analysis of reflected impulse electromagnetic fields are considered. The impulse fields are reflected from the model of human body surface. The normal incidence of plane wave with Gaussian time form on the layered medium with losses is considered. The reflected electromagnetic field is obtained by FDTD method. Initial data for neural network analysis are the values of amplitude of electrical component of reflected field in different moments of time. So, the analysis is performed in time domain directly. As an example, the network is trained to determine the thickness of one of the layers of the medium. The stability of the determination in presence of interferences, experimental errors and instabilities of medium parameters is investigated. The approximating properties of the artificial neural network are considered for the smooth change of the second layer thickness.
{"title":"Approximating properties of artificial neural network in time domain for the analysis of electromagnetic fields reflected from model of human body surface","authors":"O. Dumin, D. Shyrokorad, O. Dumina, V. Katrich, V. Chebotarev","doi":"10.1109/MSMW.2010.5546075","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546075","url":null,"abstract":"The approximating properties of artificial neural network for the problem of determination of thickness a layer of layered medium by means of the analysis of reflected impulse electromagnetic fields are considered. The impulse fields are reflected from the model of human body surface. The normal incidence of plane wave with Gaussian time form on the layered medium with losses is considered. The reflected electromagnetic field is obtained by FDTD method. Initial data for neural network analysis are the values of amplitude of electrical component of reflected field in different moments of time. So, the analysis is performed in time domain directly. As an example, the network is trained to determine the thickness of one of the layers of the medium. The stability of the determination in presence of interferences, experimental errors and instabilities of medium parameters is investigated. The approximating properties of the artificial neural network are considered for the smooth change of the second layer thickness.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122489819","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 : 2010-06-21DOI: 10.1109/MSMW.2010.5546205
H. Farhang, M. Bardegar, A. Mohammad, H. Farahmandzad
2D simulation model of helix TWT is developed by MAGIC Code. This model contains electron gun and helix Slow-Wave Structure (SWS). 3D magnetic simulation is done by means of CST EM Studio and the axial periodic magnetic field is imported into MAGIC 2D. Absorber coating profile is measured using reduced-height rectangular waveguide and subsequently bulk conductivity for each segment is calculated to develop accurate simulation model. Simulation results are found to be in good agreement with experiments. This model is used to optimize output power with minimum change in structure, while suppressing Backward Wave Oscillation (BWO). As increasing power may lead to exceed some thermal limitations, 3D MAGIC simulation is also performed to calculate power loss of each element. Total power loss, caused by surface current and particle impact energy, is calculated and compared with those obtained without optimization.
利用MAGIC程序建立螺旋行波管的二维仿真模型。该模型包含电子枪和螺旋慢波结构(SWS)。利用CST EM Studio进行三维磁场仿真，并将轴向周期磁场导入MAGIC 2D中。利用减高矩形波导测量了吸收层的分布，并计算了每一段的体电导率，从而建立了精确的仿真模型。仿真结果与实验结果吻合较好。该模型用于在结构变化最小的情况下优化输出功率，同时抑制反向波振荡(BWO)。由于功率增加可能会导致超出某些热限制，因此还进行了3D MAGIC模拟，以计算每个元件的功率损耗。计算了由表面电流和粒子冲击能引起的总功率损失，并与未优化的结果进行了比较。
{"title":"Optimization of an x-band TWT a using MAGIC PIC-FDTD code","authors":"H. Farhang, M. Bardegar, A. Mohammad, H. Farahmandzad","doi":"10.1109/MSMW.2010.5546205","DOIUrl":"https://doi.org/10.1109/MSMW.2010.5546205","url":null,"abstract":"2D simulation model of helix TWT is developed by MAGIC Code. This model contains electron gun and helix Slow-Wave Structure (SWS). 3D magnetic simulation is done by means of CST EM Studio and the axial periodic magnetic field is imported into MAGIC 2D. Absorber coating profile is measured using reduced-height rectangular waveguide and subsequently bulk conductivity for each segment is calculated to develop accurate simulation model. Simulation results are found to be in good agreement with experiments. This model is used to optimize output power with minimum change in structure, while suppressing Backward Wave Oscillation (BWO). As increasing power may lead to exceed some thermal limitations, 3D MAGIC simulation is also performed to calculate power loss of each element. Total power loss, caused by surface current and particle impact energy, is calculated and compared with those obtained without optimization.","PeriodicalId":129834,"journal":{"name":"2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114459870","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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